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

At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online.

Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech’s invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information. In some cases, Proton’s services have even been instrumental in saving lives by enabling secure and private communications in high-risk situations.

Proton is a profitable company that does not rely upon VC funding, supporting over 100 million user accounts with a growing team of over 500 people from over 50 different countries, from the world's top companies and universities. We value intelligence, learning potential, and ambition in our hiring process. Adaptability is key as we navigate uncharted territories and redefine how business is conducted online.

Hiring at Proton is highly selective, with less than 1% of candidates hired. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density. You will have the opportunity to work with many of the world's top minds in their fields, ranging from former international math and science olympiad winners to chess champions.

We have a global mindset and big ambitions but remain a start-up at heart. We value empowerment and flexibility and keep our structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can truly be proud of. Check our open-source projects here!

The team:

Proton VPN enables millions of people to connect securely and privately, even in places where the internet is restricted or unreliable. Delivering that experience means our service must perform flawlessly under highly variable, real-world conditions.

We are looking for a Senior Performance Engineer to lead our efforts in making Proton VPN the fastest, most resilient, and most reliable VPN service in the world.

You will define and drive the measurement, analysis, and optimization of Proton VPN’s end-to-end performance, across clients, platforms, and global infrastructure. You’ll help ensure that every connection is fast, stable, and private, regardless of where the user is or what network they’re on.

What you will do: 

• Design and own Proton VPN’s performance framework, defining metrics and KPIs that reflect the real-world experience of users (time-to-connect, throughput, latency, stability, reconnection rates, etc.).
• Develop distributed testing systems that simulate real network conditions, including low bandwidth, packet loss, and high-latency scenarios.
• Continuously measure and analyze performance across platforms (desktop, mobile, backend) and regions to identify bottlenecks and regressions.
• Collaborate with backend, R&D, and client teams to optimize protocol handling, connection setup, routing, and encryption performance.
• Create dashboards, reports, and automated alerts to track global performance health.
• Contribute to the design of resilient connectivity strategies that adapt dynamically to variable network conditions.
• Serve as the performance champion within the engineering organization, mentoring others and driving a data-driven performance culture.

Job requirements: 

Technical Skills

• 5+ years of experience in performance engineering or systems QA, ideally in networking, VPNs, or distributed systems.
• Knowledge of network protocols (TCP/IP, UDP, TLS, WireGuard, debugging, manipulating, and performance profiling tools.
• Proven ability to analyze latency, throughput, and stability metrics across multiple layers (client, OS, transport, application).
• Proficiency in Python (or similar scripting language)
• Familiarity with network emulation and simulation tools (e.g., tc/netem, iperf, IPTables/nfTables…).
• Experience with monitoring and observability stacks (Grafana, Prometheus, Loki) and CI/CD pipelines.
• Cross-platform experience with Linux, macOS, Windows, Android, and iOS preferred.

Bonus points for: 

• Experience with Rust/C/C++/System development

Soft Skills

• Analytical and methodical, yet creative in solving complex performance problems.
• Comfortable working with uncertainty and non-deterministic conditions.
• Collaborative mindset, able to work across client, infrastructure, and data teams.
• Strong communication and documentation skills in English.

What We Offer

• Office First: Collaboration is easier and more effective in person, which is why we have offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, and Taipei. You can also enjoy working from home up to 30% of the time, while enjoying great company during our three core days in the office. 
• Technology: We provide all the devices and software you need to excel in your role, ensuring you have the best tools at your disposal to achieve your goals.
• Food: Lunch and snacks are provided by Proton every day at our offices.
• Transport: We will always support our employees with transport costs through subsidizing public transport, bike allowances, or parking spaces based on your office location.
• Stock Options: At Proton, we are all owners of the company and you get stock options when you join us.
• Flexible Working: You can define your own working hours as long as it works with team meetings.
• Learning and Development: We are committed to your professional growth. Proton offers various learning opportunities, including training programs, conferences and events, and continual learning.
• Employee Benefits: Comprehensive health insurance plans, competitive retirement savings options, generous vacation and leave policies, and wellness programs.
• Work that Matters: Proton is a community-first organization, started with the support of a crowdfunding campaign and built with community input. To this day, Proton’s only source of revenue is user subscriptions. Over 100 million people trust and support Proton, and we put our users and community first in everything we do. Read more about our impact here.

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.

#LI-Onsite

Job Overview

Wargaming is inviting talented Server developers who are ready to learn a lot, take responsibility for the result of their work and meet the expectations of our players together with us. In our team you will have to solve interesting tasks related to the development of World of Tanks on the whole technological stack.

Reports to

Solution Architect

What will you do?

• Develop high performance (in terms of memory and execution time) in-game components
• Improve and develop the existing technology stack
• Work with dozens of additional services and applications that make up the large-scale infrastructure of our project (payment systems, authorization systems, analytical data warehouses, etc.)
• Cover the functionality with tests
• Participate in the creation of new game modes and logic on the game server

What are we looking for?

• Experience in commercial software development
• Strong knowledge of basic data structures and algorithms
• Development experience in C++ and Python
• Knowledge of design patterns
• Experience in developing asynchronous/multithreaded applications
• Knowledge of CPU and memory principles (RAM, ROM, caches, virtual memory, allocators, profiling, swap file, etc.)
• Familiarity with Linux systems 
• Familiarity with databases, message brokers
• Computer networking fundamentals (TCP/UDP, reliability, flow control) 

What additional skills will help you stand out?

• Gamedev experience
• Python–C++ integration (pybind11, CPython embedding)
• Real-time simulation / fixed-rate game loops  
• CMake or large C++ build systems 
• Experience in web applications development (backend)
• Experience of working with distributed systems
• Passion for computer games

What additional skills will help you stand out?

• Experience in web applications development (frontend, backend)
• Experience of working with distributed systems
• Passion for computer games
• Gamedev experience

Work mode

• Hybrid (3 days of work from the office)

The salary range for this role in Vilnius is EUR 4000-6700 monthly gross.

Benefits

Benefits and perks are tailored to the local market and culture. Our benefits in Vilnius include:

• Additional paid time off 
• Sick Leave Compensation
• Pregnancy and Childbirth Leave Benefit  
• Career development and education opportunities within the company
• Meal Allowance
• Premium Private Health Care 
• Mental well-being program (iFeel)
• Perks discounts platform (over 450 exclusive discounts)
• Personal Gaming Account
• Coffee, fruits, and snacks in the office
• Company events 
• Seniority Awards  
• Referral program - You can recommend the best talents to the company and receive a reward  

Please submit your CV in English to ensure smooth processing and review.

Job Overview

Wargaming is inviting talented Server developers who are ready to learn a lot, take responsibility for the result of their work and meet the expectations of our players together with us. In our team you will have to solve interesting tasks related to the development of World of Tanks on the whole technological stack.

Reports to

Solution Architect

What will you do?

• Develop high performance (in terms of memory and execution time) in-game components
• Improve and develop the existing technology stack
• Work with dozens of additional services and applications that make up the large-scale infrastructure of our project (payment systems, authorization systems, analytical data warehouses, etc.)
• Cover the functionality with tests
• Participate in the creation of new game modes and logic on the game server

What are we looking for?

• Experience in commercial software development
• Strong knowledge of basic data structures and algorithms
• Development experience in C++ and Python
• Knowledge of design patterns
• Experience in developing asynchronous/multithreaded applications
• Knowledge of CPU and memory principles (RAM, ROM, caches, virtual memory, allocators, profiling, swap file, etc.)
• Familiarity with Linux systems 
• Familiarity with databases, message brokers
• Computer networking fundamentals (TCP/UDP, reliability, flow control) 

What additional skills will help you stand out?

• Gamedev experience
• Python–C++ integration (pybind11, CPython embedding)
• Real-time simulation / fixed-rate game loops  
• CMake or large C++ build systems 
• Experience in web applications development (backend)
• Experience of working with distributed systems
• Passion for computer games

Work mode

• Hybrid (3 days of work from the office)

Benefits

Benefits and perks are tailored to the local market and culture. Our benefits in Nicosia include:

• 21 days annual leave (additional days based on years of service: up to 25 days) 
• Additional paid time off (5 Personal Days, Birthday Leave, Marriage Leave, Compassionate Leave) 
• Sick Leave (10 days top-up to statutory allowance per year)
• Maternity Leave (18 weeks top-up to statutory allowance per case)
• Career development and education opportunities within the company
• English Language courses fully covered by the company upon Manager’s approval
• Premium Private Health Care
• Mental well-being program (iFeel)
• Onsite gym and spa
• Free parking close to the Nicosia offices, based on availability
• Free drinks-equipped kitchen in every floor building
• Eurobank benefits (if applicable)
• Employee discounts (e.g. restaurants, bars, etc.)
• Personal Gaming Account 
• Onsite canteen with subsidized prices for food and drinks
• Company events, Social Clubs
• Seniority Awards  
• Referral program - You can recommend the best talents to the company and receive a reward 

Please submit your CV in English to ensure smooth processing and review.

Required:

• 3+ in Windows desktop application development using Windows App SDK, WinUI (or similar), C#, XAML — and ideally additional experience with native Windows code (C++, Win32/WinRT/COM).
• Deep understanding of Windows application architecture, including interop between managed code (.NET) and native code.
• Proven track record of designing, building, and shipping production-quality desktop applications, with an emphasis on reliability, performance, scalability, and maintainability.
• Strong experience with accessibility APIs on Windows (e.g. Microsoft UI Automation or similar), and a dedication to building accessible and inclusive software.
• Excellent software engineering fundamentals: OOP, design patterns, data structures, algorithms, memory management, multi-threading or asynchronous programming (where relevant).
• Experience leading technical design, mentoring other engineers, conducting code reviews, and making architecture-level decisions.
• Strong communication skills; ability to articulate tradeoffs, collaborate with cross-functional teams, and drive consensus.
• A user-centric mindset: focus on building polished, intuitive, and accessible experiences for end users.

Preferred / Bonus:

• Experience with writing automated tests for UI — unit tests, integration tests, UI automation tests; familiarity with relevant testing frameworks.
• Experience with performance optimization for desktop apps (memory usage, startup time, rendering performance, high-DPI support, responsiveness under load).
• Experience with localization/globalization, right-to-left UI support, internationalization, accessibility for multiple regions.
• Familiarity with telemetry, analytics, crash reporting, logging, and error monitoring in desktop applications.
• Previous experience in shaping CI/CD workflows, release pipelines, and deployment strategies for desktop applications.
• Demonstrated ability to take ownership of feature areas or modules and drive them long-term, including maintenance, refactoring, and technical debt management.

What we offer

• A high-impact role: you will define architecture, shape the future of our Windows product, and directly influence what millions of users see and experience.
• A collaborative, flat-structure engineering culture — you are not just a coder, but a builder and a decision-maker.
• Opportunities to lead — mentor others, steer technical direction, and grow into broader technical leadership (e.g. Tech Lead, Architect).
• Flexibility, autonomy, and responsibility: you define how to solve problems, own features end-to-end, and contribute to long-term product vision.
• A purpose-driven mission: building software that’s reliable, accessible, and user-centered — making a real difference for people.                  

Think you’re a good fit for this job? 

Tell us more about yourself and why you're interested in the role when you apply.
And don’t forget to include links to your portfolio and LinkedIn.

Not looking but know someone who would make a great fit? 
Refer them! 

Speechify is committed to a diverse and inclusive workplace. 
Speechify does not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status.

The opportunity
The Apple Platforms team is dedicated to developing and maintaining Unity Engine support across Apple’s ecosystem, including iOS, iPadOS, macOS, and tvOS. We work in close collaboration with the Android platform team, together owning and developing features that span mobile platforms. We handle platform specific implementation details and provide a unified solution to create interactive visual content on all supported platforms. This enables our users to focus on bringing their ideas to life without having to worry about technical differences between various platforms. We are looking for a Senior Software Engineer to join our team. You will have the opportunity to develop, optimize and expand tools used to create the majority of mobile games. You will contribute to team deliverables and collaborate with other engineers.

What you'll be doing

• Maintain and improve existing features
• Design and build new features
• Follow best practices to write clean, cross-platform code, cover functionality with tests, and provide clear documentation
• Work closely with internal and external stakeholders, including product, QA, customer support teams, to ensure their requirements are met

What we're looking for

• Experience designing, building and maintaining features or products
• Proficiency in C++, C#
• Excellent communication and collaboration skills

You might also have

• Experience building mobile applications
• Experience building mobile applications
• Experience working with Unity Editor
• Experience with Swift, Objective C
• Knowledge of quality assurance methodologies

Additional information

• Relocation support is not available for this position.
• Work visa/immigration sponsorship is not available for this position

Benefits
At Unity, we want our team members to thrive. We offer a wide range of benefits designed to support well-being and work-life balance.

Please note: Benefits eligibility, specific offerings, and coverage vary based on the country and employment status.

While specific benefits vary, here are some of the ways we strive to take care of our eligible team members globally: Comprehensive health, life, and disability insurance | Commute subsidy | Employee stock ownership | Competitive retirement/pension plans | Generous vacation and personal days | Support for new parents through leave and family-care programs | Office food snacks | Mental Health and Wellbeing programs and support | Employee Resource Groups | Global Employee Assistance Program | Training and development programs | Volunteering and donation matching program

Life at Unity

Unity [NYSE: U] is the world’s leading game engine, powering play for more than 3 billion consumers each month. The top mobile games in the world, the most played PC indie titles, the most innovative console games, and virtually all of the top XR and Web Games are developed, deployed, and grown in Unity. Unity also enables teams across industries like automotive, manufacturing, and healthcare to design, simulate, and collaborate in 3D — closing the gap between ideas and reality. For more information, please visit www.unity.com.

Unity is a proud equal opportunity employer. We are committed to fostering an inclusive, innovative environment and celebrate our employees across age, race, color, ancestry, national origin, religion, disability, sex, gender identity or expression, sexual orientation, or any other protected status in accordance with applicable law. Our differences are strengths that enable us to support the growing and evolving needs of our customers, partners, and collaborators. If you have a disability that means there are preparations or accommodations we can make to help ensure you have a comfortable and positive interview experience, please fill out this form to let us know.

This position requires the incumbent to have a sufficient knowledge of English to have professional verbal and written exchanges in this language since the performance of the duties related to this position requires frequent and regular communication with colleagues and partners located worldwide and whose common language is English.

Headhunters and recruitment agencies may not submit resumes/CVs through this website or directly to managers. Unity does not accept unsolicited headhunter and agency resumes. Unity will not pay fees to any third-party agency or company that does not have a signed agreement with Unity.

Your privacy is important to us. Please take a moment to review our Prospect and Applicant Privacy Policies. Should you have any concerns about your privacy, please contact us at DPO@unity.com.

#SEN