
Proton · Skopje; Vilnius; Barcelona;
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: privac...
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!
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.
Kotlin, Java, Espresso, UI Automator, Maestro
similar
investors with conflicting agendas, not governments. The work you do here is real, and the impact is measurable. (read more
about our impact here)
we're building. When Proton wins, you win.
accelerate your career because you'll be thrown into real challenges, with real ownership, from day one.
leave, and wellness support so you can bring your best self to work every day
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
for you.
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.
Compensation range
Vilnius: 37.000 - 61.000 EUR gross annually*
Barcelona: 40.000 - 64.000 EUR gross annually*
Other locations: Compensation will be discussed during the interview process
#LI-Onsite
Contractor role Working hours: 3:00 PM – 11:00 PM PHT About the Role As QA Automation Engineer for mobile applications, you are going to play a crucial role by interacting with our squads and with the product team as well to ensure that our features meet our qualitative and quantitative standards. You are going to write tests on your own but also train the members of our development teams to have a much better perspective on quality assurance whilst developing and will serve as a steward in terms of quality for the Websites team. Your Responsibilities: * Lead QA efforts for mobile-first SaaS solutions, working closely with engineering and product teams to ensure quality, performance, and reliability across iOS and Android applications. * Develop, maintain, and scale a comprehensive mobile automation framework that supports native, hybrid, and cross-platform apps (including Flutter). * Oversee the full lifecycle of automated mobile test cases—design, implementation, execution, reporting, and continuous optimization—following best practices and structured methodologies. * Select and implement mobile testing tools (e.g., Appium, Espresso, XCUITest, Flutter Driver), and manage cloud-based device testing platforms such as BrowserStack and Sauce Labs for real-device and cross-platform coverage. * Collaborate with product stakeholders to define mobile-focused test strategies, acceptance criteria, and feature validation aligned with sprint goals. * Support and manage app submission workflows to the Google Play Console and Apple App Store Connect, ensuring compliance and release readiness. * Continuously evolve QA processes to streamline mobile testing and accelerate feedback loops in Agile/Scrum environments. Your Profile: * Excellent communication skills in English, with the ability to bridge gaps between technical teams and business stakeholders. * 5+ years of experience in test automation, with a strong emphasis on mobile application testing (native and cross-platform). * Hands-on expertise with mobile testing frameworks and tools, including Appium, Espresso, XCUITest, Flutter Driver, and integration_test for Flutter apps. * Proficient in using BrowserStack, Sauce Labs, Firebase Test Lab, and other cloud-based device labs to execute tests at scale. * Familiarity with mobile app submission processes via the Google Play Console and App Store Connect, including pre-launch reports and release monitoring. * Experience with complementary tools such as Postman, Charles Proxy, JMeter, Firebase Performance Monitoring, Jira, Jenkins/GitLab CI, and Git. * Proven ability to define, execute, and continuously improve mobile testing strategies in fast-paced, iterative development environments. * A collaborative and proactive team member who enjoys mentoring others and promoting a quality-first culture across teams.
We're putting together a talented team to build the #1 training platform for Runners We help everyday runners become outstanding by building an incredible app providing world-class training, coaching and community for everyone, whether you're improving your 5k time or training for your first marathon. We’re growing extremely fast! In November 2023 we closed a $6.5M funding round led by JamJar with participation from Eka Ventures, Venrex and Creator Ventures. In 2024, we were selected by Apple as one of three global finalists for the iPhone app of the year, reflecting the innovation and impact of what we’ve built & in 2025 we were acquired by Strava! Our ambition is huge: to become the go-to global leading training platform for millions of runners everywhere. We’re growing with purpose and looking for people who want to build something meaningful with lasting impact. With the recent acquisition by Strava accelerating our journey, now is a really magical time to join. 🚀 ABOUT THE CONTRACT ROLE We are looking for talented, creative and positive team players for our highly-skilled cross-functional engineering group on a contract basis. This role will collaborate closely with our modelling teams to integrate features that are core to Runna’s mission (think adapting plans around holidays and B races, supporting new cutting edge plans, and building in-app experiences around our AI/ML tooling). This will be a 6-month contract role. WHAT YOU’LL BE DOING * Architecting, building, testing and delivering new features across the full stack * Working with the Product team to identify the most suitable solution for the best customer experience * Collaborating with modelling/AI engineers to design architecture used to interface between the Runna training engine and Runna app * Always be on hand to help when help is needed on technical matters * Coaching and supporting engineers, providing guidance, mentorship, and code reviews without creating bottlenecks. * Contribute to us operate more efficiently, by building and maintaining our developer tooling and CI/CD pipeline * We rotate the responsibility of releases across engineers, so you will get the opportunity to lead the process and deploy changes to production * Impacting engineering by championing new technologies and setting standards for engineering quality WHAT YOU’LL BRING TO THE TEAM: * Very proficient in TypeScript/JavaScript development * Able to work in a highly skilled engineering team in a fast-paced, iterative environment. In 2024 we shipped: * 99 mobile app releases (iOS and Android) * 443 API releases * 237 modelling backend releases * 4+ years experience in your main expertise area (Frontend, Backend etc) * Comfortable picking up new things and working on technologies outside your comfort zone * Are skilled in delivering features end-to-end, from architecture design and building through to releasing, testing and supporting * Enthusiasm for our ways of working which include: * Iterative development, continuous deployment and test automation * Knowledge sharing, pair programming, collaborative design & development * Shared code ownership & cross-functional teams * Have experience with React Native (worked on large scale applications) * Have experience with AWS * Are experienced in delivering features full-stack BONUS POINTS IF YOU HAVE: * Are experienced in SwiftUI * Are experienced in deployment, releasing cycles or CI/CD * Have experience with Serverless architectures * Experience with Terraform or other IaC tooling (e.g. CDK, CloudFormation, etc.) * Have experience in open source contributions, including reporting bugs/issues in GitHub, testing new releases, or contributing to code OUR TECH STACK Below you can find a small reflection of our current tech stack: Frontend: * React Native (iOS and Android) * Typescript * GraphQL (Apollo Client) * Fastlane * SwiftUI (Apple Watch) * Maestro E2E tests Backend: * Serverless (AWS) * Lambdas (NodeJS & Python) * AWS AppSync * DynamoDB, S3, SQS, SNS, EventBridge, SageMaker * Snowflake All the other good stuff: * Sentry * GitHub Actions * Intercom, Mixpanel * RevenueCat * App Store Connect / Play Store * Google Tag Manager OUR INTERVIEW PROCESS: Our aim is to keep the interview process as straightforward and enjoyable as possible, and will consist of the following stages: 1. Screening call with Talent team (30 minute video call) 2. Getting to Know You + Live Coding (45-minute video call, first 25 mins will be an introductory chat followed by two live coding exercises from https://leetcode.com/) 3. 1.5-hour technical interview (the first half of the call will be used to discuss the take-home technical task from the previous stage and the second half will consist of system design and some general architecture/tech questions) Please let us know if there’s anything we can do to better accommodate you throughout the interview process - this can be from scheduling interviews around childcare commitments to accessibility requirements. We want you to show your best self in the process, so please speak to your Talent Partner
We're putting together a talented team to build the #1 training platform for Runners We help everyday runners become outstanding by building an incredible app providing world-class training, coaching and community for everyone, whether you're improving your 5k time or training for your first marathon. We’re growing extremely fast! In November 2023 we closed a $6.5M funding round led by JamJar with participation from Eka Ventures, Venrex and Creator Ventures. In 2024, we were selected by Apple as one of three global finalists for the iPhone app of the year, reflecting the innovation and impact of what we’ve built & in 2025 we were acquired by Strava! Our ambition is huge: to become the go-to global leading training platform for millions of runners everywhere. We’re growing with purpose and looking for people who want to build something meaningful with lasting impact. With the recent acquisition by Strava accelerating our journey, now is a really magical time to join. 🚀 THE TEAM YOU'LL JOIN Our Growth Engineering team owns key parts of the user journey into Runna, working across web and app to turn first time visitors into long term, engaged subscribers. You'll collaborate closely with product, design and data partners, as well as our GTM and business development teams, to shape how new users first discover and experience Runna. WHAT YOU'LL BE DOING * Architect, build, test and ship high impact user journeys and subscription funnels, focusing on turning curious visitors into engaged subscribers. * Design and run experiments across web and app - onboarding flows, paywalls, plan discovery - to improve conversion at every step. * Work closely with Product, Design and Data to help prioritise opportunities, define success metrics and make decisions grounded in experiment results. * Collaborate across teams to ensure users have a smooth, consistent experience as they move between products and platforms. * Implement and maintain instrumentation, tracking and tooling so we can understand behaviour, spot issues quickly and measure impact. * Own features end-to-end: from early discovery and technical design through to implementation, rollout, monitoring and iteration. * Contribute to our developer experience by improving CI/CD, testing and release workflows so the team can ship and learn quickly. WHAT YOU'LL BRING TO THE TEAM We're looking for people who are strong in some of these areas, not necessarily all of them. If this role excites you, please apply. * Solid TypeScript / JavaScript experience. * Experience building user-facing product surfaces where conversion and UX really matter — onboarding, paywalls, landing pages, growth loops, etc. * React experience (React Native is a bonus, not a requirement). * 2+ years of full stack experience — we value full stack experience more than depth in just one layer. * Comfortable working in a fast paced, iterative environment with lots of experimentation and learning from data. * Able to deliver features end-to-end: from architecture through to rollout, measurement and iteration. * Curious about what didn't work as much as what did. HOW WE WORK We believe great engineering is a team sport. Here's what that looks like in practice: * Iterative development, continuous deployment and test automation. * Knowledge sharing and collaborative design — we build together, not in silos. * Shared ownership of code and outcomes across cross-functional teams. * Psychological safety to experiment, fail, learn and try again. BONUS POINTS These are optional extras, not hidden requirements: * Experience with Swift or Kotlin for mobile. * Experience working on growth, experimentation, or funnel optimisation teams. * Experience with analytics and experimentation tooling (A/B tests, feature flags, etc). OUR TECH STACK Here's what we work with. You won't need all of it on day one. Frontend * React or React Native (iOS and Android) * TypeScript * GraphQL (Apollo Client) Backend * Node.js * Serverless (AWS) — Lambdas, SQS, DynamoDB, EventBridge, S3 Tools & Platforms * Sentry, GitHub Actions * Mixpanel, Intercom, RevenueCat * App Store Connect / Play Store * Google Tag Manager, Snowflake SALARY AND BENEFITS We’re offering a salary of £70,00-£78,000 per year, depending on experience, plus participation in Strava's long-term incentive (stock) programs. Overview of our benefits is below:We’re also committed to continually evolving our benefits to support you as we grow. Here is a brief overview what we currently offer in the UK 🇬🇧 * 💪 Flexible working — typically 3 days a week in our Vauxhall office, with flexibility around life commitments. * 🏝️ 25 days holiday plus bank holidays. * 🏥 Private health insurance (Bupa) and workplace pension scheme. * 📚 Modern Health — mental wellness platform combining therapy, coaching and self guided programmes. * 🥕 Carrot Fertility — inclusive fertility, hormonal health and family forming support. We want everyone to feel supported in building their family, whatever that looks like. * 😌 Headspace membership for mindfulness and sleep. * 💵 Annual budget for gear, events and gym. * 💳 Free Runna and Strava subscriptions for you and 3 friends. Please see more info on our amazing benefits here: Benefits at Runna OUR INTERVIEW PROCESS WE AIM TO MAKE THIS AS CLEAR AND LOW-STRESS AS POSSIBLE. HERE'S WHAT TO EXPECT: * Screening call with our Talent team (30 minutes, video call). * Getting to Know You + Live Coding (45 minutes — 15 mins intro chat, then a short coding exercise. This is designed to be conversational, not a test to catch you out. We use an accessible problem from leetcode.com and talk through our thinking together). * Take home technical task (feel free to use AI tools as part of your normal workflow). * Technical interview (1.5 hours — first half on general full-stack questions, second half is a system design exercise based on a real problem our team has worked on at Runna). * Meet the team (in-person at our Vauxhall office with founders and the wider team). Runna is committed to building a diverse and inclusive team. We particularly encourage applications from groups that are underrepresented in engineering, including women, people of colour, and LGBTQ+ people. Please let us know if there’s anything we can do to better accommodate you throughout the interview process - this can be from scheduling interviews around childcare commitments to accessibility requirements. We want you to show your best self in the process, so please speak to your Talent Partner