CircleCI Jobs in Lisbon.
All active CircleCI roles based in Lisbon.
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About Us
Riskified empowers businesses to unleash ecommerce growth by taking risk off the table. Many of the world’s biggest brands and publicly traded companies selling online rely on Riskified for guaranteed protection against chargebacks, to fight fraud and policy abuse at scale, and to improve customer retention. Developed and managed by the largest team of ecommerce risk analysts, data scientists and researchers, Riskified’s AI-powered fraud and risk intelligence platform analyzes the individual behind each interaction to provide real-time decisions and robust identity-based insights. Riskified is proud to work with incredible companies in virtually all industries including Acer, Gucci, Lorna Jane, GoPro, and many more.
We thrive in a collaborative work setting, alongside great people, to build and enhance products that matter. Abundant opportunities to create and contribute provide us with a sense of purpose that extends beyond ourselves, leaving a lasting impact. These sentiments capture why we choose Riskified every day.
About the Role
The Data Science department plays a pivotal role in our company, generating value to Riskified by developing algorithms and analytical production-grade solutions. We leverage advanced techniques and algorithms to provide maximum value from data in all shapes and sizes (such as classification models, NLP, anomaly detection, graph theory, deep learning, and more). As a Data Scientist, you will assume the classic data-science role of an end-to-end project development and implementation practitioner. Being part of the team requires a mix of hard quantitative and analytical skills, solid background in statistical modeling and machine learning, a technical data-savvy nature, along with a passion for problem-solving and a desire to drive data-driven decision-making.
What You'll Be Doing
- Data Exploration and Preprocessing: Collect, clean, and transform large, complex data sets from various sources to ensure data quality and integrity for analysis
- Statistical Analysis and Modeling: Apply statistical methods and mathematical models to identify patterns, trends, and relationships in data sets, and develop predictive models
- Machine Learning: Develop and implement machine learning algorithms, such as classification, regression, clustering, and deep learning, to solve business problems and improve processes
- Feature Engineering: Extract relevant features from structured and unstructured data sources, and design and engineer new features to enhance model performance
- Model Development and Evaluation: Build, train, and optimize machine learning models using state-of-the-art techniques, and evaluate model performance using appropriate metrics
- Data Visualization: Present complex analysis results in a clear and concise manner using data visualization techniques, and communicate insights to stakeholders effectively
- Collaborative Problem-Solving: Collaborate with cross-functional teams, including product managers, data engineers, software developers, and business stakeholders to identify data-driven solutions and implement them in production environments
- Research and Innovation: Stay up to date with the latest advancements in data science, machine learning, and related fields, and proactively explore new approaches to enhance the company's analytical capabilities
Qualifications
- B.Sc (M.Sc is a plus) in Computer Science, Mathematics, Statistics, or a related field
- 3+ years of proven experience designing and implementing machine learning algorithms and successfully deploying them to production.
- Strong understanding and practical experience with various machine learning algorithms.
- Proficiency in Python, Experience with SQL and data manipulation tools (e.g., Pandas, NumPy) to extract, clean, and transform data for analysis
- Solid foundation in statistical concepts and techniques, including hypothesis testing, regression analysis, time series analysis, and experimental design
- Strong analytical and critical thinking skills to approach business problems, formulate hypotheses, and translate them into actionable solutions
- Proficiency in data visualization libraries, to create meaningful visual representations of complex data
- Excellent written and verbal communication skills to present complex findings and technical concepts to both technical and non-technical stakeholders
- Demonstrated ability to work effectively in cross-functional teams, collaborate with colleagues, and contribute to a positive work environment
- Experience in the fraud domain
- Experience with Airflow, CircleCI, PySpark, Docker and K8S
Life at Riskified
We are a fast-growing and dynamic tech company with 750+ team members globally. We value collaboration and innovative thinking.
We’re looking for bright, driven, and passionate people to grow with us.
Some of our Lisbon Benefits & Perks:
- Hybrid mode of work
- Flexible schedule
- Healthcare benefits
- Fully-stocked kitchens
- Benefits package per month—per your choice, e.g., work-from-home equipment, gym membership, wellbeing activities, and more.
- Wellness program
- Celebrations and activities
- Team events
- Happy hours
- Awesome Riskified gifts and swags
- Volunteer programs
- Personal development
- Global onboarding
- Role-based technical skills training
- Full access to Udemy
In the News
Built In: How We Built This: A Riskified Technologist Unpacks The Company’s Beacon Technology
Globes: Riskified is among Israel’s fastest growing companies
Yahoo: Riskified Earns "Top Rated" Award Across Four TrustRadius Solution Categories
Riskified is deeply committed to the principle of equal opportunity for all individuals. We do not discriminate based on race, color, religion, sex, sexual orientation, national origin, age, disability, veteran status, or any other status protected by law.
Ready to apply?
Apply to Riskified
At Catawiki, every day brings the extraordinary! Whether it’s Daniel Ricciardo’s Formula 1 Car, a Woolly Mammoth’s Skeleton, Lady Gaga's Jumpsuit or Usain Bolt’s running shoe, we encounter exceptional objects every day.
We’re a one-of-a-kind marketplace for buying and selling special objects. Each week, more than 100,000 unique items are auctioned, all carefully curated by our passionate in-house experts.
Having sold over 25 million unique objects, our mission is to become the world’s most popular destination for special objects. As a growing, diverse and sustainable scale-up, we proudly live by three core values. If these values resonate with you, we’d love to explore how you can join us.
- Taking ownership and driving impact
- Being open to change and feedback
- Being passionate about our mission and our customers.
Key Responsibilities
- Design, Develop, and Maintain Automated Test Suites: Build and execute automated test scripts to cover end-to-end testing for web applications, mobile apps (iOS/Android), and APIs.
- Cross-Platform Testing: Develop automated tests across multiple platforms, ensuring consistency in test quality and reporting for web, mobile, and API testing.
- Test Automation Frameworks: Contribute to the development and improvement of test automation frameworks using tools such as Playwright, Espresso, XCUITest or similar, ensuring scalability and maintainability.
- CI/CD Integration: Collaborate with the Platform team to ensure automated tests are smoothly integrated into CI/CD pipelines for rapid feedback on product quality.
- End-to-End Testing: Execute functional, regression, performance, and load testing for complex workflows across platforms, ensuring product reliability and quality.
- Defect Tracking and Reporting: Identify, log, and track defects through to resolution, providing clear feedback to developers and ensuring timely fixes.
Skills and Qualifications
- Proven Experience in Test Automation: Experience in automated testing across web, mobile (iOS/Android), and APIs, with hands-on experience using automation tools such as Selenium, Playwright, etc.
- Strong Programming Skills: Proficiency in programming languages used for test automation (e.g. Kotlin, TypeScript, Ruby, or similar).
- API Testing: Experience in automating RESTful API testing using tools like Postman, RestAssured, or similar.
- CI/CD Pipeline Integration: Familiarity with integrating automated tests into CI/CD pipelines using tools like Github Actions, CircleCI, etc.
- Test Framework Development: Experience in building or extending test automation frameworks, ensuring they are scalable and maintainable.
- Cross-Browser and Cross-Device Testing: Familiarity with ensuring test execution across multiple browsers (e.g., Chrome, Safari, Firefox) and mobile devices (both iOS and Android). Experience with cloud-based testing environments (e.g., BrowserStack)
- Agile Methodologies: Experience working in Agile environments, participating in sprint planning, daily stand-ups, and retrospectives.
- Problem-Solving Mindset: Ability to troubleshoot issues across multiple platforms and work with cross-functional teams to resolve them effectively.
- Understanding of QA Principles: Strong knowledge of QA methodologies, including functional testing, regression testing, performance testing, and load testing.
Why You'll Love Working with Us
- Create a visible impact by working at scale in a global organisation serving millions of customers across 80+ categories. In our flat structure, every role has a broad scope and directly impacts both our customers and the business.
- Learn and grow through our Learning & Development initiatives, including clear development plans and mentorship programmes to support your career progression.
- A culture of connection defines us. We’re a passionate, diverse team of 800+ Catawikians representing 60+ nationalities. We foster an inclusive and queer-friendly environment where everyone is encouraged to bring their full self to work.
- Celebrate life’s moments with us. You’ll receive a €100 Catavoucher when you join, a €50 Catavoucher on your birthday, and an extra day off each year to “Pursue Your Passion”. We also offer additional leave for key work anniversaries and important life events. Benefits may vary by location.
Our Offices and Way of Working
Our vibrant offices in Amsterdam, Paris and Lisbon are designed to inspire collaboration. Most Catawikians operate in a hybrid setup, combining office-based and remote work, with a minimum of two days per week in the office, unless a role is explicitly stated as fully remote or fully office-based.
Interested?
Apply with an English CV and Cover Letter. By applying, you agree to Catawiki’s Applicant Privacy Policy. If you’re excited about this role but don’t meet every requirement, we still encourage you to apply anyway. You may be just the right candidate for this or other roles.
Ready to apply?
Apply to Catawiki
About Us
Riskified empowers businesses to unleash ecommerce growth by taking risk off the table. Many of the world’s biggest brands and publicly traded companies selling online rely on Riskified for guaranteed protection against chargebacks, to fight fraud and policy abuse at scale, and to improve customer retention. Developed and managed by the largest team of ecommerce risk analysts, data scientists and researchers, Riskified’s AI-powered fraud and risk intelligence platform analyzes the individual behind each interaction to provide real-time decisions and robust identity-based insights. Riskified is proud to work with incredible companies in virtually all industries including Acer, Gucci, Lorna Jane, GoPro, and many more.
We thrive in a collaborative work setting, alongside great people, to build and enhance products that matter. Abundant opportunities to create and contribute provide us with a sense of purpose that extends beyond ourselves, leaving a lasting impact. These sentiments capture why we choose Riskified every day.
About the Role
The Data Science department plays a pivotal role in our company, generating value to Riskified by developing algorithms and analytical production-grade solutions. We leverage advanced techniques and algorithms to provide maximum value from data in all shapes and sizes (such as classification models, NLP, anomaly detection, graph theory, deep learning, and more).
As a Data Science Team Leader, you will lead a talented team of data scientists while maintaining hands-on involvement in complex technical projects. You will be responsible for recruiting, mentoring, and developing team members while ensuring the delivery of high-impact machine learning solutions for fraud detection and risk assessment.
What You'll Be Doing
Technical Leadership
- Define technical approaches for complex data science projects involving tabular data at scale
- Lead critical projects and contribute code to production systems
- Establish and maintain best practices for model development, evaluation, and deployment
- Conduct code reviews to ensure quality, maintainability, and adherence to standards
- Guide team members through complex technical challenges
Team Leadership & Management
- Recruit, onboard, mentor, and manage data scientists
- Foster a collaborative, innovative environment that encourages experimentation and knowledge sharing
- Work closely with data engineers, ML engineers, fraud domain experts, and product managers
- Define success metrics and demonstrate business value of data science initiatives
- Forecast team needs and advocate for necessary tools and infrastructure
Qualifications
Required
- M.Sc in Computer Science, Mathematics, Statistics, or a related field
- 6+ years of proven experience designing and implementing machine learning algorithms with tabular data and successfully deploying them to production
- 3+ years of experience managing and leading data science teams (minimum 3 direct reports)
- Demonstrated track record in recruiting, interviewing, and hiring data science talent
- Strong understanding and practical experience with various machine learning algorithms for structured/tabular data
- Strong programming skills with high standards for code quality - proficiency in Python with experience writing clean, maintainable, production-grade code
- Experience with data manipulation tools (e.g., Pandas, NumPy) to extract, clean, and transform large-scale tabular datasets
- Solid foundation in statistical concepts and techniques, including hypothesis testing, regression analysis, time series analysis, and experimental design
- Strong analytical and critical thinking skills to approach business problems and translate them into actionable solutions
- Demonstrated ability to lead cross-functional teams and contribute to a positive work environment
Advantages
- Experience in the fraud domain - Strong advantage
- Experience with Airflow, CircleCI, PySpark, Docker and K8S
Life at Riskified
We are a fast-growing and dynamic tech company with 750+ team members globally. We value collaboration and innovative thinking.
We’re looking for bright, driven, and passionate people to grow with us.
Some of our Lisbon Benefits & Perks:
- Hybrid mode of work
- Flexible schedule
- Healthcare benefits
- Fully-stocked kitchens
- Benefits package per month—per your choice, e.g., work-from-home equipment, gym membership, wellbeing activities, and more.
- Wellness program
- Celebrations and activities
- Team events
- Happy hours
- Awesome Riskified gifts and swags
- Volunteer programs
- Personal development
- Global onboarding
- Role-based technical skills training
- Full access to Udemy
In the News
Built In: How We Built This: A Riskified Technologist Unpacks The Company’s Beacon Technology
Globes: Riskified is among Israel’s fastest growing companies
Yahoo: Riskified Earns "Top Rated" Award Across Four TrustRadius Solution Categories
Riskified is deeply committed to the principle of equal opportunity for all individuals. We do not discriminate based on race, color, religion, sex, sexual orientation, national origin, age, disability, veteran status, or any other status protected by law.
Ready to apply?
Apply to Riskified
About Us
Riskified empowers businesses to unleash ecommerce growth by taking risk off the table. Many of the world’s biggest brands and publicly traded companies selling online rely on Riskified for guaranteed protection against chargebacks, to fight fraud and policy abuse at scale, and to improve customer retention. Developed and managed by the largest team of ecommerce risk analysts, data scientists and researchers, Riskified’s AI-powered fraud and risk intelligence platform analyzes the individual behind each interaction to provide real-time decisions and robust identity-based insights. Riskified is proud to work with incredible companies in virtually all industries including Acer, Gucci, Lorna Jane, GoPro, and many more.
We thrive in a collaborative work setting, alongside great people, to build and enhance products that matter. Abundant opportunities to create and contribute provide us with a sense of purpose that extends beyond ourselves, leaving a lasting impact. These sentiments capture why we choose Riskified every day.
About the Role
As a Full-Stack Developer in Riskified’s Core Services Group, you’ll build and maintain applications end-to-end using various technologies. Working in a dynamic, agile environment with cutting-edge technologies, you’ll contribute to expanding Riskified’s ecosystem.
Our developers take full ownership, from feature planning with Product and Design to selecting technologies, designing architecture, coding, reviewing, deploying in a CI/CD environment, and monitoring post-deployment.
The team focuses on customer-facing applications, including a core web tool that allows merchants to review orders, perform actions, and gain insights through advanced analytics. Whether you’re crafting precise UI, developing robust backend logic, or optimizing infrastructure for scale, you’ll have the opportunity to engage end-to-end.
Our Stack: Scala, Spark, Node.js, Ruby, React, Postgres, Elastic, Redis, AWS, Kafka, Docker, Kubernetes, CircleCI and much more.
What You'll Be Doing
- Design and develop a highly reliable, available, and scalable architecture for our core services and web applications in a new promising product
- Deploy your code to production daily (we have advanced CI/CD pipelines)
- Be a strong owner of production systems, keeping them running smoothly
- Active part in planning the team roadmap and products
- Collaborating with design and product teams to define and implement new features
Qualifications
- B.Sc. in Computer Science or equivalent certifications
- 3+ years of proven experience in hands-on server-side coding
- Hands-on experience in React
- Hands-on experience in Node - advantage
- Proven experience in full-stack development, with proficiency in both frontend and backend technologies.
- Strong understanding of databases (SQL, NoSQL) and familiarity with cloud services (AWS, GCP).
- Great attitude - an independent self-learner and a strong team player
Life at Riskified
We are a fast-growing and dynamic tech company with 750+ team members globally. We value collaboration and innovative thinking.
We’re looking for bright, driven, and passionate people to grow with us.
Some of our Lisbon Benefits & Perks:
- Hybrid mode of work
- Flexible schedule
- Healthcare & dental benefits
- Fully-stocked kitchens
- Benefits package per month—per your choice, e.g., work-from-home equipment, gym membership, wellbeing activities, and more.
- Wellness program
- Celebrations and activities
- Team events
- Happy hours
- Awesome Riskified gifts and swags
- Volunteer programs
- Personal development
- Global onboarding
- Role-based technical skills training
- Full access to Udemy
In the News
Built In: How We Built This: A Riskified Technologist Unpacks The Company’s Beacon Technology
Globes: Riskified is among Israel’s fastest growing companies
Yahoo: Riskified Earns "Top Rated" Award Across Four TrustRadius Solution Categories
Riskified is deeply committed to the principle of equal opportunity for all individuals. We do not discriminate based on race, color, religion, sex, sexual orientation, national origin, age, disability, veteran status, or any other status protected by law.
Ready to apply?
Apply to Riskified
About Us
Riskified empowers businesses to unleash ecommerce growth by taking risk off the table. Many of the world’s biggest brands and publicly traded companies selling online rely on Riskified for guaranteed protection against chargebacks, to fight fraud and policy abuse at scale, and to improve customer retention. Developed and managed by the largest team of ecommerce risk analysts, data scientists and researchers, Riskified’s AI-powered fraud and risk intelligence platform analyzes the individual behind each interaction to provide real-time decisions and robust identity-based insights. Riskified is proud to work with incredible companies in virtually all industries including Acer, Gucci, Lorna Jane, GoPro, and many more.
We thrive in a collaborative work setting, alongside great people, to build and enhance products that matter. Abundant opportunities to create and contribute provide us with a sense of purpose that extends beyond ourselves, leaving a lasting impact. These sentiments capture why we choose Riskified every day.
About the Role
As a Full-Stack Developer in Riskified’s Core Services Group, you’ll build and maintain applications end-to-end using various technologies. Working in a dynamic, agile environment with cutting-edge technologies, you’ll contribute to expanding Riskified’s ecosystem.
Our developers take full ownership, from feature planning with Product and Design to selecting technologies, designing architecture, coding, reviewing, deploying in a CI/CD environment, and monitoring post-deployment.
The team focuses on customer-facing applications, including a core web tool that allows merchants to review orders, perform actions, and gain insights through advanced analytics. Whether you’re crafting precise UI, developing robust backend logic, or optimizing infrastructure for scale, you’ll have the opportunity to engage end-to-end.
Our Stack: Scala, Spark, Node.js, Ruby, React, Postgres, Elastic, Redis, AWS, Kafka, Docker, Kubernetes, CircleCI and much more.
What You'll Be Doing
- Design and develop a highly reliable, available, and scalable architecture for our core services and web applications in a new promising product
- Deploy your code to production daily (we have advanced CI/CD pipelines)
- Be a strong owner of production systems, keeping them running smoothly
- Active part in planning the team roadmap and products
- Collaborating with design and product teams to define and implement new features
Qualifications
- B.Sc. in Computer Science or equivalent certifications
- 5+ years of proven experience in hands-on server-side coding
- Hands-on experience in React
- Hands-on experience in Node - advantage
- Proven experience in full-stack development, with proficiency in both frontend and backend technologies.
- Strong understanding of databases (SQL, NoSQL) and familiarity with cloud services (AWS, GCP).
- Great attitude - an independent self-learner and a strong team player
Life at Riskified
We are a fast-growing and dynamic tech company with 750+ team members globally. We value collaboration and innovative thinking.
We’re looking for bright, driven, and passionate people to grow with us.
Some of our Lisbon Benefits & Perks:
- Hybrid mode of work
- Flexible schedule
- Healthcare & dental benefits
- Fully-stocked kitchens
- Benefits package per month—per your choice, e.g., work-from-home equipment, gym membership, wellbeing activities, and more.
- Wellness program
- Celebrations and activities
- Team events
- Happy hours
- Awesome Riskified gifts and swags
- Volunteer programs
- Personal development
- Global onboarding
- Role-based technical skills training
- Full access to Udemy
In the News
Built In: How We Built This: A Riskified Technologist Unpacks The Company’s Beacon Technology
Globes: Riskified is among Israel’s fastest growing companies
Yahoo: Riskified Earns "Top Rated" Award Across Four TrustRadius Solution Categories
Riskified is deeply committed to the principle of equal opportunity for all individuals. We do not discriminate based on race, color, religion, sex, sexual orientation, national origin, age, disability, veteran status, or any other status protected by law.
Ready to apply?
Apply to Riskified
Site Reliability Engineering Manager (Data Infra)
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We are looking for a driven and experienced Site Reliability Engineering Manager to join our innovative Tech Team. You will lead and empower a team of SREs, partnering closely with Engineering, Product, and Security to ensure our platforms are resilient, scalable, and secure. You will play a key role in shaping reliability strategy, improving system performance, and embedding best practices in observability, incident management, and automation to support the delivery of high-impact solutions in the fight against financial crime.
As a Site Reliability Engineering (SRE) Manager, you will:
- Take ownership of your team, being responsible for current team members’ growth and development, plus hiring and onboarding new team members
- Create a positive environment where your team members thrive to deliver the best outcomes and innovations
- Be a role model for your team, mentoring and coaching them, whilst having a learning mindset yourself, being open to new ideas and technologies
- Within the context of our broader technology vision, set the direction for your team and take accountability for tech decisions
- Use your specific experience working with cloud systems to input into technical decision-making
- Work with other stakeholders across engineering to ensure the systems and services your team provides meet the needs of your internal customers
- Collaborate, both within your team and across the tribe to ensure your team’s implementation meets industry standards
The role reports to the Director of Infrastructure. You’ll be managing a team of Engineers focused on the provision and support of our Stateful / Data layer technologies powering all of our services, both in development and production. The main technologies we use are YugaByte (sharded Postgres), Kafka (via Strimzi), Elasticsearch (via ECK), Redis and Spark/data warehousing on GCP and AWS using their PaaS systems. As the technology stack underpins all other engineering work, a collaborative mindset is a must.
Our tech stack:
ComplyAdvantage is fully cloud-based, with a modern kubernetes-focused tech stack. All compute workloads run in Kubernetes, with clusters in multiple regions to support the needs of our global client base. Our production services are multi-cloud by design and are currently hosted in AWS and GCP.
We make heavy use of Terraform and Helm to define our infrastructure and services, and lean heavily on GitOps paradigms - production and non-production environments are defined in git and changes to these environments (both cloud infrastructure and Kubernetes applications) are managed via git.
ArgoCD is our tool of choice for controlling our deployments, and paired with our Istio mesh, allows us for advanced deployment patterns used by our development teams such a progressive rollouts. Our observability stack consists of Grafana Cloud, along with some on-prem Mimir, amongst others. We focus on Open Telemetry for application metrics, with SLO and metric driven alerting at all levels, from Cloud infra through to application performance.
Across the wider Technology team, teams build and release containerised applications to support the wide array of activities that our teams are engaged in - from developing low latency client-facing APIs, to machine learning models and data processing pipelines.
About you:
As an Site Reliability Engineering (SRE) Manager, you will
- Have experience of managing and growing high performing engineering teams
- Have experience with Kubernetes and Terraform
- Have experience hosting microservices-based architectures
- Have experience of working with cloud native architectures (AWS and GCP are preferred)
- Have good communication and writing skills including experience writing technical documentation
Nice to haves:
- Experience of working in a start-up/ scale-up environment
- Have experience managing observability platforms, whether self-hosted or third party - eg Grafana stack, Datadog, NewRelic
- Have experience managing pipeline tools, whether self-hosted or third party - eg CircleCI, ArgoCD, Harness, etc
Benefits:
- Equity as we want you to have a part of what we are building
- Private medical insurance designed to keep you ensuring peace of mind while you excel in your career
- Unlimited Time Off Policy- A work-life balance and focus on our well-being are critical to keeping us performing at our best
- We embrace a hybrid approach that requires employees to be in the office for two days a week. We strongly believe that this approach fosters collaboration and enables the building of meaningful relationships
- You will also get a new starter budget to kit out your home office
- Opportunity to work on innovative projects with smart-minded people keen to share their knowledge and continuously improve
- Annual learning budget (prorated based on start date) to drive your performance and career development
About us:
Our mission is to empower every business to eliminate financial crime.
By harnessing AI, a unified platform, and an extensive partner ecosystem, we help customers turn compliance into a catalyst for growth, operational resilience, and enduring regulatory trust.
More than 3,000 enterprises across 75 countries rely on our end-to-end platform and the world’s most comprehensive financial crime risk intelligence. With full-stack agentic automation, we help organizations automate up to 95% of KYC, AML, and sanctions reviews, cut onboarding times by 50%, reduce false positives by 70%, and handle 7x more work with the same staff.
ComplyAdvantage is headquartered in London and has global hubs in New York, Lisbon, Singapore, and Cluj-Napoca. It is backed by Balderton Capital, Index Ventures, Ontario Teachers’ Pension Plan, Goldman Sachs, and Andreessen Horowitz. Learn more about compliance re-engineered for the age of AI at complyadvantage.com.
Ready to apply?
Apply to ComplyAdvantage