In the Global Bank tribe, we are building the infrastructure and core services needed to provide our merchants with a digital bank account that empowers them to be successful at doing what they love. Our goal is to become the most popular banking partner for small merchants globally by offering a high-quality banking experience tailored to their needs - effortless, simple, and affordable.

Joining the Global Bank tribe means playing a key role in helping us build SumUp's digital bank. You’ll collaborate with a global, autonomous, cross-functional team that refines an aspect of our product from concept to execution. Work alongside colleagues from 32 nationalities across Cologne, Berlin, São Paulo, Sofia, London and Vilnius, united by a shared commitment to taking ownership, working with purpose, and helping small businesses thrive.

As a Senior Backend Engineer, you'll be responsible for evolving and maintaining a high-throughput banking ecosystem for merchants inside our Global Bank Tribe. You’ll play a key role in architecting and evolving our global banking platform; ensuring high availability, scalability, and observability across multiple regions. If you'd like to gain experience building business accounts, card payment, and transfers products etc, across Europe and Latam for SumUp's Global Bank, join us and be part of this exciting journey!

What You’ll Do

• Collaborate with a global team to design and build a unified global banking platform. This includes high-level APIs for multiple regions and local implementations, ensuring high availability and observability
• Be part of the transformation team that is transforming monolithic services into decoupled, highly scalable, region-agnostic, unified global bank services
• Design, implement, and iteratively develop highly available backend services, while continuously evaluating and implementing new methods to ensure the high reliability of transfer systems
• Maintain and improve core services utilizing a modern, cloud-native technology stack (AWS, K8s), with microservices written in Golang, Kotlin and Java and Elixir.
• Improve test coverage for existing services and drive the end-to-end delivery of changes, including testing, observability, and monitoring.
• Shape and continuously improve our engineering culture by sharing ideas, refining best practices, exploring innovative solutions, and contributing to comprehensive documentation and tool selection.

You’ll be great for this role if 

• Solid programming experience and interest in working in any of these modern languages (Java, Kotlin, Golang and Elixir).
• You have advanced understanding of developing and maintaining distributed and event-driven systems.
• You have solid experience with event streaming platforms and messaging brokers such as Kafka
• You have experience with modern cloud technologies like AWS, and containerization tools such as Docker and Kubernetes
• You feel comfortable working with SQL and NoSQL databases
• You are experienced with CI/CD tools like GitHub Actions or ArgoCD
• You take pride in your work, have a keen sense of ownership, and are dedicated to writing clear, maintainable, and testable code.
• Your curiosity and enthusiasm for solving meaningful challenges for users and a commitment to collaboration and continuous learning.
• You are comfortable pairing with your peers on a day-to-day basis, sharing knowledge and learning from each other, fostering the culture of knowledge sharing 

Why you should join SumUp

• Be part of a company that values diversity and celebrates unique perspectives.
• Work with a global team of skilled professionals in an environment that fosters collaboration, learning, and growth.
• The opportunity to work on large scale fintech products used by millions of businesses around the world
• You’ll receive 25 days’ paid leave, plus 1 additional day for each year of employment.
• You can take up to 10 days’ educational leave to expand your skill set.
• Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University leadership cohort and a yearly learning budget (2,000 EUR)
• Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success
• Access to the SumUp Sabbatical, our Employee assistance program for mental health
• Join a global team where you belong: Check out our D&I Initiatives and Employee Resource Groups such as Pride Club, SumAfro, Neurodiversity, Grupos Mais, Women in Tech, and more
• We offer additional health insurance, a subsidized Multisport card, free shuttle buses from Joliot-Curie metro station and other great benefits.
• You’ll attend global offsites and/or hackathons

About SumUp

At SumUp, we’re on a mission to empower small businesses around the world with simple, affordable tools to help them start, run, and grow. More than 4 million merchants across 36 markets trust us as their financial partner — and we’re just getting started.

We’re a global team of 3,000+ people from over 90 nationalities, united by curiosity, collaboration, and care. Our core values and culture shape everything we do, fostering inclusion, learning, and belonging.

SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive.

👉 Explore more about our culture on our careers site, or follow us on LinkedIn and Instagram.

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

In the Global Bank tribe, we are building the infrastructure and core services needed to provide our merchants with a digital bank account that empowers them to be successful at doing what they love. Our goal is to become the most popular banking partner for small merchants globally by offering a high-quality banking experience tailored to their needs—effortless, simple, and affordable.

Joining the Global Bank tribe means playing a key role in helping us build SumUp's digital bank. You’ll collaborate with a global, autonomous, cross-functional team that refines an aspect of our product from concept to execution. Work alongside colleagues from 32 nationalities across Cologne, Berlin, São Paulo, Sofia, London and Vilnius, united by a shared commitment to taking ownership, working with purpose, and helping small businesses thrive.

As a Senior Backend Engineer, you will play a key role in helping us transition from a localized setup with regional banks to a unified Global Bank. A significant challenge will involve supporting the move to a fully distributed, event-driven architecture. 

Our tech stack includes Go, AWS, Kafka, PostgreSQL, and Kubernetes, supported by a strong observability toolchain with Prometheus, Grafana, and Honeycomb. We also actively use AI‑assisted development tools such as Cursor, GitHub Copilot, and others.

SumUp’s engineering culture is built around ownership. We follow a “build it, run it, improve it” model, with strong observability and a focus on learning. Engineers have clear scope and autonomy, with decisions documented, reviewed, and made collaboratively.

The Vilnius team is a core part of the Global Bank domain. We own production systems, shape technical direction, and work closely with colleagues across SumUp’s global offices on critical merchant banking capabilities. Join our Vilnius Team today (Vilnius office).

What You’ll Do

• Collaborate with a global team to design and build a unified global banking platform. This includes high-level APIs for multiple regions and local implementations, ensuring high availability and observability
• Be part of the transformation team that is transforming monolithic services into decoupled, highly scalable, region-agnostic, unified global bank services
• Design, implement, and iteratively develop highly available backend services, while continuously evaluating and implementing new methods to ensure the high reliability of transfer systems
• Maintain and improve core services utilizing a modern, cloud-native technology stack (AWS, K8s), with microservices written in Golang, Kotlin and Java and Elixir.
• Improve test coverage for existing services and drive the end-to-end delivery of changes, including testing, observability, and monitoring.
• Shape and continuously improve our engineering culture by sharing ideas, refining best practices, exploring innovative solutions, and contributing to comprehensive documentation and tool selection.

You’ll be great for this role if 

• Solid programming experience in Golang and are interested in working with additional languages such as Java, Kotlin and Elixir.
• You have advanced understanding of developing and maintaining distributed and event-driven systems.
• You have solid experience with event streaming platforms and messaging brokers such as Kafka
• You have experience with modern cloud technologies like AWS, and containerization tools such as Docker and Kubernetes
• You feel comfortable working with SQL and NoSQL databases
• You are experienced with CI/CD tools like GitHub Actions or ArgoCD
• You take pride in your work, have a keen sense of ownership, and are dedicated to writing clear, maintainable, and testable code.

Any of the following would be considered a plus

• Experience with monitoring tools - Prometheus, Grafana, Honeycomb
• Experience in the fintech industry

Why you should join SumUp

🌎 We’re a truly global team of 3200+ skilled professionals from 92+ countries, spread across 4 continents. Join the team from our Vilnius office.

🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced.

🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp’s future success

🏖️ Time off: 25 days of paid leave, plus special holidays

🏥 Peace of mind: health insurance through Gjensidige and life & accidental coverage from Ergo

💪 Stay active: gym membership allowance to help you keep fit on your terms

📚Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University cohort and a yearly learning budget (2,000 EUR)

💡We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.

🌴 Break4me: 1-month sabbatical after 3 years of service

🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team.

Compensation: For entry senior level 5250 - 7500 Euro Gross / month + 2000 EUR annual learning budget + Virtual Stock Options. Ranges may vary based on skills and experience.

About SumUp

At SumUp, we’re on a mission to empower small businesses around the world with simple, affordable tools to help them start, run, and grow. More than 4 million merchants across 37 markets trust us as their financial partner — and we’re just getting started.

We’re a global team of 3,000+ people from over 90 nationalities, united by curiosity, collaboration, and care. Our core values and culture shape everything we do, fostering inclusion, learning, and belonging.

SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive.

👉 Explore more about our culture on our careers site, or follow us on LinkedIn and Instagram.

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

Summary

The Software Engineer is responsible for developing and maintaining software systems that support Shift4’s products. This role focuses on implementing reliable, scalable, and maintainable solutions while collaborating closely with product managers, designers, and fellow engineers. The engineer contributes to multiple phases of the development lifecycle, including design, development, testing, and deployment, while continuously improving technical skills and contributing to engineering best practices.

Responsibilities

• Collaborate with product and engineering leaders to design, build, and enhance software solutions that deliver measurable customer and business impact.
• Develop and maintain internal applications through hands-on coding, testing, debugging, and deployment of maintainable and reusable software.
• Contribute to system design discussions and implement technical solutions aligned with established architectural standards.
• Work within an agile development process, participating in two-week sprints with the goal of delivering release-ready software each cycle.
• Integrate applications with backend services, APIs, and cloud-based infrastructure.
• Operate independently when required, exercising sound judgment in decision-making and ensuring proper documentation of technical designs and workflows.
• Write clean, well-documented, and testable code following team coding standards and best practices.
• Participate in code reviews to maintain quality and consistency across the codebase.
• Identify opportunities to improve application performance, reliability, and maintainability.
• Troubleshoot issues, debug software defects, and support resolution of production incidents when needed.
• Stay up to date with modern development practices, frameworks, and technologies.
• Ensure compliance with software governance, security, and quality policies.
• Perform additional tasks within the department as assigned by management.

Qualifications

• 3-5 years of professional software development experience.
• Proficiency in JavaScript/TypeScript, React Native, and related libraries (e.g., Redux, React Navigation).
• Experience integrating with backend systems (REST APIs or equivalent) and working with cloud services such as AWS or similar platforms.
• Experience with version control systems, particularly Git.
• Familiarity with CI/CD pipelines, automated testing, and release management practices.
• Understanding of mobile performance considerations and debugging techniques.
• Strong problem-solving skills and the ability to develop practical technical solutions.
• Motivation to take on increasing responsibility and ownership within an agile development team.

Preferred Qualifications:

• Understanding of modern web application development using TypeScript with frameworks such as React or Ember.
• Experience working with AWS-hosted backends and databases.
• Bachelor’s degree in Computer Science, Engineering, Information Systems, or a related field.
• Experience working with native iOS (Swift/Objective-C) or Android (Kotlin/Java) codebases.
• Familiarity with mobile security, data encryption, and compliance practices.
• Experience with a distributed software system.
• Relevant professional certifications are advantageous but not required.

Benefits:

The salary range for this position is starting at 4000 Eur Gross. The exact salary will be determined based on the candidate’s experience.

In the Global Bank tribe, we're building the infrastructure to provide merchants with a digital business account that empowers them to manage their banking needs. Our goal is to become the most popular banking partner for small merchants globally with an effortless, simple, and affordable experience.

You'll help us transition from fragmented regional setups to a unified global infrastructure, directly enabling millions of merchants worldwide to access seamless banking tailored to their needs.

As a Senior Backend Engineer on the Global Accounts team, you'll own critical pieces of our bank account platform. You'll help us design and build a fully distributed, event-driven system designed to scale across regions with resilience and compliance built in.

You'll work primarily in Kotlin, with opportunities in Elixir and Golang. We practice Extreme Programming: small iterations, daily deliveries, and a focus on technical design quality and deep problem understanding.

Our tech stack includes Kotlin, Golang, Elixir, Java, AWS, Kafka, PostgreSQL, and Kubernetes, supported by observability tools like Prometheus, Grafana, and Honeycomb. We also use AI-assisted development tools including Cursor and GitHub Copilot.

What You'll Do

• Build critical infrastructure from scratch: Contribute to the design and implementation of a newly architected global accounts platform. You'll help migrate existing systems to a modern, event-driven, decoupled architecture that enables scalability and resilience across regions.
• Master event-driven architecture: You'll be working extensively with Kafka to build a truly decoupled, resilient system. Event-driven architecture is essential to our goal of ensuring that failures in one part of the system don't bring down banking operations globally. This isn't just a technical requirement—it's the foundation of building a platform that can handle the complexities of multi-region banking.
• Solve complex compliance challenges: Design flexible systems that handle varying regulatory and verification requirements across different regions and use cases. You'll make compliance requirements maintainable and natural rather than an afterthought.
• Enable other teams: Build a self-service platform that empowers internal teams across the organization to contribute to and build on top of.
• Work globally: Your work will directly impact EU and LATAM markets, with potential US expansion on the horizon.

You'll Be Great for This Role If

• Strong technical foundation: Solid backend development experience in Kotlin, with interest in working across multiple languages (Golang, Elixir). You understand system architecture, object-oriented and functional design principles, data modeling, and API design (RESTful and event-driven).
• Event-driven architecture expertise: Proven experience with Kafka and event-driven systems. You understand how this enables true decoupling and resilience in distributed systems.
• Distributed systems mastery: You've built tested, observable, scalable, robust, and fault-tolerant distributed systems. You have hands-on experience with AWS, Docker, Kubernetes, cloud-native architectures, and relational databases, understanding data consistency and performance considerations.
• Ownership and craft: You take full ownership of the software you ship, from design to production readiness. You value clean, maintainable code and continuously refactor to keep designs simple and scalable.
• Motivated by the challenge: You're curious and energized by complex problem-solving rather than just shipping features quickly. You thrive in environments with fast iterations and careful design, where understanding the problem deeply is valued over rushing to delivery. You're excited by the opportunity to architect critical systems from scratch and work in a team that practices Extreme Programming with daily deliveries.
• Collaborative mindset: You communicate respectfully, share knowledge openly, and actively support your teammates' growth.

Why you’ll enjoy working at SumUp

• Be part of a company that values diversity and celebrates unique perspectives.
• Work with a global team of skilled professionals in an environment that fosters collaboration, learning, and growth.
• Be part of a global tribe building a banking solution from the ground up and delivering impactful solutions to the real-life problems of millions of SumUp merchants all over the world
• Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University leadership cohort and a yearly learning budget (2,000 EUR)
• Sabbatical program for tenured SumUppers
• Join a global team where you belong: Check out our D&I Initiatives and Employee Resource Groups such as Pride Club, SumAfro, Neurodiversity, Grupos Mais, Women in Tech, and more
• Health & wellness benefits: in-house fitness classes, gym in the office, subsidized Urban Sports Club and available psychotherapy sessions
• A lot of other benefits such as Subsidized Public Transport Card, Kita placement assistance, Pension Scheme, Language Learning platform/courses etc.
• Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success

About SumUp

About SumUp

At SumUp, we’re on a mission to empower small businesses around the world with simple, affordable tools to help them start, run, and grow. More than 4 million merchants across 37 markets trust us as their financial partner — and we’re just getting started.

We’re a global team of 3,000+ people from over 90 nationalities, united by curiosity, collaboration, and care. Our core valuesOpens in new window and cultureOpens in new window shape everything we do, fostering inclusion, learning, and belonging.

SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive.

👉 Explore more about our culture on our careers site, or follow us on LinkedInOpens in new window and InstagramOpens in new window.

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

In the Global Bank tribe, we're building the infrastructure to provide merchants with a digital business account that empowers them to manage their banking needs. Our goal is to become the most popular banking partner for small merchants globally with an effortless, simple, and affordable experience.

You'll help us transition from fragmented regional setups to a unified global infrastructure, directly enabling millions of merchants worldwide to access seamless banking tailored to their needs.

As a Senior Backend Engineer on the Global Accounts team, you'll own critical pieces of our bank account platform. You'll help us design and build a fully distributed, event-driven system designed to scale across regions with resilience and compliance built in.

You'll work primarily in Kotlin, with opportunities in Elixir and Golang. We practice Extreme Programming: small iterations, daily deliveries, and a focus on technical design quality and deep problem understanding.

Our tech stack includes Kotlin, Golang, Elixir, Java, AWS, Kafka, PostgreSQL, and Kubernetes, supported by observability tools like Prometheus, Grafana, and Honeycomb. We also use AI-assisted development tools including Cursor and GitHub Copilot.

What You'll Do

• Build critical infrastructure from scratch: Contribute to the design and implementation of a newly architected global accounts platform. You'll help migrate existing systems to a modern, event-driven, decoupled architecture that enables scalability and resilience across regions.
• Master event-driven architecture: You'll be working extensively with Kafka to build a truly decoupled, resilient system. Event-driven architecture is essential to our goal of ensuring that failures in one part of the system don't bring down banking operations globally. This isn't just a technical requirement—it's the foundation of building a platform that can handle the complexities of multi-region banking.
• Solve complex compliance challenges: Design flexible systems that handle varying regulatory and verification requirements across different regions and use cases. You'll make compliance requirements maintainable and natural rather than an afterthought.
• Enable other teams: Build a self-service platform that empowers internal teams across the organization to contribute to and build on top of.
• Work globally: Your work will directly impact EU and LATAM markets, with potential US expansion on the horizon.

You'll Be Great for This Role If

• Strong technical foundation: Solid backend development experience in Kotlin, with interest in working across multiple languages (Golang, Elixir). You understand system architecture, object-oriented and functional design principles, data modeling, and API design (RESTful and event-driven).
• Event-driven architecture expertise: Proven experience with Kafka and event-driven systems. You understand how this enables true decoupling and resilience in distributed systems.
• Distributed systems mastery: You've built tested, observable, scalable, robust, and fault-tolerant distributed systems. You have hands-on experience with AWS, Docker, Kubernetes, cloud-native architectures, and relational databases, understanding data consistency and performance considerations.
• Ownership and craft: You take full ownership of the software you ship, from design to production readiness. You value clean, maintainable code and continuously refactor to keep designs simple and scalable.
• Motivated by the challenge: You're curious and energized by complex problem-solving rather than just shipping features quickly. You thrive in environments with fast iterations and careful design, where understanding the problem deeply is valued over rushing to delivery. You're excited by the opportunity to architect critical systems from scratch and work in a team that practices Extreme Programming with daily deliveries.
• Collaborative mindset: You communicate respectfully, share knowledge openly, and actively support your teammates' growth.

Why you’ll enjoy working at SumUp

• Be part of a company that values diversity and celebrates unique perspectives.
• Work with a global team of skilled professionals in an environment that fosters collaboration, learning, and growth.
• Be part of a global tribe building a banking solution from the ground up and delivering impactful solutions to the real-life problems of millions of SumUp merchants all over the world
• Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University leadership cohort and a yearly learning budget (2,000 EUR)
• Sabbatical program for tenured SumUppers
• Join a global team where you belong: Check out our D&I Initiatives and Employee Resource Groups such as Pride Club, SumAfro, Neurodiversity, Grupos Mais, Women in Tech, and more
• Health & wellness benefits: in-house fitness classes, gym in the office, subsidized Urban Sports Club and available psychotherapy sessions
• A lot of other benefits such as Subsidized Public Transport Card, Kita placement assistance, Pension Scheme, Language Learning platform/courses etc.
• Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success

About SumUp

About SumUp

At SumUp, we’re on a mission to empower small businesses around the world with simple, affordable tools to help them start, run, and grow. More than 4 million merchants across 37 markets trust us as their financial partner — and we’re just getting started.

We’re a global team of 3,000+ people from over 90 nationalities, united by curiosity, collaboration, and care. Our core valuesOpens in new window and cultureOpens in new window shape everything we do, fostering inclusion, learning, and belonging.

SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive.

👉 Explore more about our culture on our careers site, or follow us on LinkedInOpens in new window and InstagramOpens in new window.

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

About the Job:

You will be the technical lead within our release orchestration and deployment product development teams. You will build upon our software stack that is being run by numerous Fortune 5000 companies in the world to streamline their DevOps processes at scale. We are looking for owners, people that can pick up a something from a range of topics and become experts, producing a quality solution that will last, and leaders, that can encourage team members with their work and personality to produce the best solutions. The position is full-stack, but with backend affinity – passionate about architecture, performance and scalability.

What you will do:

• Serve as the Technical Lead for our Release Orchestration product development teams.
• Own your space and pick up a range of topics to become an expert and produce a quality solution that will last.
• Lead by example with your work expertise and inspire your team with your personality to produce the best solutions.

What you will bring:

• Located in Lithuania. Candidates outside Vilnius will be considered for a hybrid work schedule, coming to office occasionally as needed.
• Bachelors degree and professional experience crafting enterprise softwareValidated experience in application/product development using a broad range of programming technologies including:
• At least 5 years of experience developing full-stack applications
• Excellent knowledge of object-oriented programming in Java and Scala languages
• Experience with Spring, Akka, ORMs, and SQL databases
• Excellent testing skills with JUnit and ScalaTest
• Solid understanding of DevOps tools and practices, including CI/CD pipelines (GitLab, GitHub Actions), containerization (Docker, Kubernetes), and cloud platforms (AWS, Azure, GCP).
• Practical experience with Go or Kubernetes, cloud platform APIs is a great plus.
• Willingness to share knowledge and mentor team members to support their growth and development
• Growth mindset, continually seeking feedback on ways to improve yourself and the team
• Familiarity with React, TypeScript, JavaScript, and associated tooling
• Understanding of software design and architecture principles to develop maintainable enterprise applications
• Phenomenal written and spoken English skills

For this position we offer a gross salary of 5,200 - 6,250 EUR/month depending on the level of experience.

Why is Digital.ai a great place to be?

Digital.ai offers great benefits including:

• Opportunity to work in an international company
• Outstanding and exciting challenges
• Cash long term incentive plan
• Private health insurance
• Employee referral program
• Free access to O'Reilly 
• Informal work environment and flexible working hours
• Additional days off
• Team building and other unifying events
• Team meals and snacks in the office
• Food delivery voucher
• Office parking

At Digital.ai, we believe in fostering a culture of pay transparency. We are committed to providing our employees with fair and competitive compensation. The current salary for this specific job is estimated to be €62,500 - €70,000 pus bonus. Please note that final compensation will be determined based on factors such as qualifications, experience, and internal equity. We value transparency and aim to create an inclusive and equitable workplace for all our employees. Certain positions at Digital.ai might also be eligible for additional compensation in the form of bonuses, or other employee benefits which are separate from the base salary and to be defined at offer stage.

All are welcome to apply.  We maintain compliance with federal, state, and local laws that prohibit employment discrimination on the basis of age, race, color, gender, identity, gender expression, sex, pregnancy, national origin, ancestry, religion, physical or mental ability, medical condition, sexual orientation, marital status, citizenship status, protected military or veteran status, and all other protected classifications. We welcome everyone and believe that diversity is the foundation of innovation.

For individuals with disabilities who would like to request accommodation, please advise us within your job application or cover letter.

FRAUD PREVENTION ALERT: please note that Digital.ai does not use third party recruiters. In our efforts to protect you against impersonation please check the email address or if you are contacted by an unfamiliar/third party requesting please reach out directly to Digital.ai.

About Proton

Join Proton and build a better internet where privacy is the default

Proton was founded in 2014 by scientists from CERN on a simple truth: privacy is a fundamental human right. Since then, we’ve built the world’s largest encrypted email service (Proton Mail) and expanded into Proton VPN, Proton Drive, Proton Pass, and Proton Calendar—tools used by millions globally to protect their freedom, fight censorship, and keep their data safe. In some situations, Proton has literally helped save lives!

We are profitable, independent (no VC control), and selectively hire from the top ~1% of applicants. Our 500+ team members across 50+ countries come from leading organizations and elite academic backgrounds. We move fast, keep hierarchy light, and prioritize impact over optics. If you want to do meaningful work with exceptionally high-caliber people, this is it. Join us and do work you can truly be proud of. Check our open-source projects here!

The team:

We're a tight-knit, passionate Android engineering team building privacy-first apps that are trusted by millions of people around the world — and yes, our code is open source, so your work is truly out there making a difference. We move fast, skip the bureaucracy, and genuinely care about what we ship. Whether you're deep in Espresso tests or debating architecture over lunch, you'll be surrounded by people who are as excited about quality as you are. If you love Android, hate flaky tests, and want your work to actually matter — you'll fit right in.

Tech Stack and Tools:

Kotlin, Java, Espresso, UI Automator, Maestro

What you will do:

• Design, develop, and maintain automated test frameworks and pipelines for Proton's Android applications

• Write and execute UI, functional, integration, and end-to-end test suites using modern Android testing tools and best practices

• Work hand-in-hand with Android developers to define testability requirements and embed automated tests into CI/CD workflows

• Hunt down bugs, document them clearly, and collaborate with the team to get them fixed fast

• Perform exploratory and risk-based testing with a sharp eye on privacy, data integrity, and security behavior

• Own and evolve the Android test infrastructure, including emulator farms, device labs, and test environment configurations

• Dig into test results, spot patterns, and turn findings into actionable improvements that raise the quality bar

• Champion QA best practices across the team and help shape how we think about quality at every stage of development

• Review test code with the same rigor as production code — maintainability and scalability matter here

• Keep up with the Android ecosystem, new testing frameworks, and open-source tooling so we're always ahead of the curve

What we are looking for:

• 3–5 years of hands-on experience in Android test automation, ideally on consumer-facing apps with a large user base

• Strong proficiency in Kotlin and/or Java, with solid experience writing clean, maintainable test code

• Proven experience with Android testing frameworks such as Espresso, UI Automator, or Maestro

• Good understanding of CI/CD pipelines and experience integrating Android tests with tools like GitLab CI, GitHub Actions, or similar

• Familiarity with Android emulators, physical device testing, and cloud-based device farms (e.g., Firebase Test Lab)

• Comfortable navigating Android Studio, ADB, and the broader Android development toolchain

• Experience with version control using Git, and a natural fit in an open-source collaborative workflow

• A good nose for security and privacy issues — understanding of privacy-by-design is a real plus

• Ability to read and understand application source code to sharpen test coverage and catch edge cases early

• Sharp analytical mindset with a structured, detail-oriented approach — you don't let things slip through the cracks

• Great communicator who thrives in a remote-friendly, internationally distributed team

• Genuine enthusiasm for open-source software, Android, and building technology that protects people's privacy

What We Offer:

• Work that Matters: millions of people trust Proton with their privacy. We answer only to our users — not advertisers, not investors with conflicting agendas, not governments. The work you do here is real, and the impact is measurable. (read more about our impact here)

• Stock Options: at Proton, we all have the opportunity to be owners of the company. From day one, you have a real stake in what we're building. When Proton wins, you win.

• Technology: you'll get the right hardware and the right software you need to do your best work.

• Learning & Development: we invest in your growth because sharp people make us better. Proton is one of the fastest ways to accelerate your career because you'll be thrown into real challenges, with real ownership, from day one.

• Employee Benefits: your wellbeing isn't an afterthought. We offer strong health coverage, solid retirement options, generous leave, and wellness support so you can bring your best self to work every day

• In-Person Collaboration: Amazing things happen when passionate, smart, and purposeful people get together in the same room. With offices across Geneva, Zürich, Barcelona, London and more, you'll spend most of your time collaborating face-to-face with people who genuinely care about what they're building

• Food: Lunch and snacks are on us every day in our offices so you can focus on the work and not on what's for lunch.

• Transport: getting to the office shouldn't cost you. We cover public transport, bike allowances, or parking, whichever works for you.

• Flexible Working: you own your schedule. Set hours that work for you and your team — because outcomes matter more than when the clock says you started.

Our Commitment to Diversity and Inclusion

At Proton, we believe diversity drives innovation and strengthens our mission to provide privacy as a default for all. We are committed to fostering an inclusive environment where all individuals, regardless of race, ethnicity, gender, age, sexual orientation, physical ability, or socio-economic background, feel valued and empowered. We strive to create equal opportunities, promote open dialogue, and support continuous learning to ensure every voice is heard and respected.

If you need any extra support or reasonable adjustments during the hiring process, please let your talent partner know.

Candidate Privacy Notice

When you apply for a position, refer a candidate, or are considered for a role at Proton Technologies AG (Proton, we, us, or our), your information is stored in Greenhouse, in accordance with their Service Privacy Policy. This information is used to evaluate your suitability for the posted position. We also retain this information for consideration for future roles that you may apply for or that we believe may align with your background and skills.

If we no longer have a legitimate business need to process your information, we will either delete or anonymize it. Should you have any inquiries about how we use or manage your information, or if you wish to access, correct, or delete your data, please contact our privacy team at careers@proton.ch.

Proton does not accept unsolicited resumes from any sources other than directly from candidates. We will not pay a fee for any placement resulting from an unsolicited offer, even if the candidate is subsequently hired by Proton.

To learn more about our privacy policy, please visit our privacy policy page.

Salary range (Vilnius) - 48.800 - 54.200 EUR gross annual 

#LI-Onsite

• 7+ years of hands-on Android development experience, with a track record of shipping and maintaining production applications at scale
• Experience building large, complex mobile applications with polished, performant UIs - ideally for global consumer audiences
• Strong proficiency in Java, with solid object-oriented design principles and a keen eye for clean, maintainable code
• Deep knowledge of the Android ecosystem - including platform fragmentation, UI design patterns, and delivering consistent experiences across a wide range of screen sizes and devices
• Solid familiarity with Google technologies, Play Store submission processes, and Google's development guidelines
• A good grasp of the full mobile product lifecycle, with practical experience working within Agile teams

Nice to have:

• Knowledge of Kotlin programming language, Clean Architecture and reactive programming
• An eye for UX and interaction design - you care about how things feel, not just how they work
• Hands-on experience with mobile CI/CD tooling, including build, test and release automation
• Experience integrating with analytics and BI systems, including A/B testing frameworks
• Experience with alternative Android markets
• Experience optimising data usage over mobile networks and building offline-first applications

• Developing features using modern frameworks, libraries and in-house components - contributing to a shared codebase built to last
• Delivering polished, intuitive user experiences that meet a high bar for design and usability
• Maintaining and improving a continuous delivery pipeline, ensuring fast, reliable and safe releases to production

#LI-Hybrid #LI-AJ1

What you'll be doing

You'll be responsible for:

• Lead and scale a team of 5+ engineers and organise work towards the product vision
• Work closely with the development team and Product Manager to deliver business value in a timely manner while following and improving upon established quality metrics.
• Orchestrate technical aspects of the product development
• Implement the most suitable development processes (principles, rules) for the team
• Coach the team to learn and apply engineering best practices in various areas starting from UI standards and CI/CD to API design and Secure SDLC
• Continue to form and grow your team – hire and onboard new members, perform training activities, help team members to follow their path for professional growth 
• Solve or escalate issues within and outside the team
• Ensure healthy collaboration with other teams, identify and manage technical and organisational dependencies
• Support an environment of transparency by providing prompt feedback, both gently and honestly

Your Experience

Must have:

• 6+ years of experience in one of the following programming languages: Scala, Java, Kotlin, Objective C/Swift.
• Experience in designing and implementing robust distributed systems
• 4+ years of team management: establishing processes in a cross-functional team, building tech roadmaps, experience in change management
• People management skills – providing one-on-ones, resolving conflicts, creating career development plans, mentoring and growing engineers
• Extensive knowledge of engineering practices and Agile methodologies 

Nice to have:

• Full-stack development experience
• Hands-on experience with DevOps tools and practices
• Outstanding communication skills
• Experience building consumer or client-facing products
• Understanding of A/B testing techniques

• Have 7+ years’ experience building distributed backend systems
• Know what it takes to make systems fast, reliable and secure and when to prioritise each
• Are fluent in Java, Scala, Python or similar (and curious enough to learn Scala with us)
• Get DevOps, databases (SQL and NoSQL) and love designing APIs that just work
• Have a strong handle on writing clean, documented, version-controlled code
• Take ownership, show initiative and don’t wait to be told
• Are product-minded and always thinking about the end-user impact

Bonus if you’ve worked with:

• Stream processing
• Public cloud infrastructure (AWS, GCP etc.)

You’ll join a senior engineering team that moves fast, thinks big and builds tech used by millions daily. You’ll work on meaningful problems with real impact - in health, privacy and scale. This isn’t just code for the sake of code. This is building the future of personalised health.

#LI-Hybrid #LI-LM12