
Proton · Vilnius
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: priva...
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 Role
Based in our Vilnius office, you’ll join one of our high-impact product teams across Proton Drive and Proton VPN, helping build
privacy-first products used by millions around the world. Whether it’s encrypted cloud storage or secure internet access, you’ll
work on technically ambitious products with real-world impact. As a senior engineer, you’ll collaborate closely with product,
design, and engineers across Proton to build and ship high-quality Android experiences using Kotlin, Jetpack Compose, and an
increasingly shared Rust core, helping define what “great” looks like for privacy-focused consumer products at scale.
What we are looking for
iteration
communicates with our Android applications through generic interfaces
Even if you don’t meet all the requirements listed above but feel you could still be a great fit, please do apply.
What We Offer
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.
Compensation range
55.000 - 110.000 EUR gross annually
Final compensation will be determined based on the candidate's qualifications, skills, and previous experience
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 its 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 anonymise 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 CVs 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.
500M+ downloads. 80M+ monthly users. A decade of building – and we’re still accelerating. Flo is the world’s #1 health & fitness app worldwide on a mission to build a better future for female health. Backed by a $200M investment led by General Atlantic, we became the first product of our kind to reach a $1B valuation in 2024 – and we’re not slowing down. With 7M paid subscribers and the highest-rated experience in the App Store’s health category, we’ve spent 10 years earning trust at scale. Now, we’re building the next generation of digital health – AI-powered, privacy-first, clinically backed – to help our users know their body better. The job As an Android Engineer at Flo, you'll help shape the mobile experience for millions of people, and do genuinely meaningful work in women's health. Our app is trusted by 1 in 4 women aged 18–44 in the US and used across 100+ countries, with machine learning and AI powering accurate cycle predictions and personalised, medically credible health insights. We build large-scale mobile applications with rich, intuitive interfaces - optimised for speed, accessibility and privacy. You'll join a cross-functional team working across the full mobile lifecycle, from feature ideation through to release and iteration, with real ownership over value delivery end to end. We're not a feature factory. Our engineers are pragmatic problem-solvers who thrive in fast-moving environments and care about what they ship. You'll have genuine scope to experiment, lead ambitious product initiatives and implement solutions that matter - not just clear a backlog. Flo is a constantly evolving product, and we give our engineers the trust and autonomy to evolve it. Your Experience Must have: * 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 What you'll be doing You'll be responsible for: * 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 Salary Range - gross per month (ranges may vary based on skills and experience) €6.500—€8.500 EUR How we work We’re a mission-led, product-driven team. We move fast, stay focused and take ownership – from brief to build to impact. Debate is encouraged. Decisions are shared. We care about craft, ship with purpose, and always raise the bar. You’ll be working with people who take their work seriously, not themselves. It takes commitment, resilience, and the drive to keep going when things get tough. Because better health outcomes are worth it. What you'll get We support impact with meaningful reward. Here’s what that looks like: * Competitive salary and annual reviews * Opportunity to participate in Flo’s performance incentive scheme * Paid holiday, sick leave, and female health leave * Enhanced parental leave and pay for maternity, paternity, same-sex and adoptive parents * Accelerated professional growth through world-changing work and learning support * In-person collaboration and work in a hybrid model, with 3 days per week spent in the office * 5-week fully paid sabbatical at 5-year Floversary * Flo Premium for friends & family, plus more health, pension and wellbeing perks Diversity, equity and inclusion Our strength is in our differences. At Flo, hiring is based on merit, skill and what you bring to the role – nothing else. We’re proud to be an equal opportunity employer, and we welcome applicants from all backgrounds, communities and identities. Read our privacy notice for job applicants.
500M+ downloads. 80M+ monthly users. A decade of building – and we’re still accelerating. Flo is the world’s #1 health & fitness app worldwide on a mission to build a better future for female health. Backed by a $200M investment led by General Atlantic, we became the first product of our kind to reach a $1B valuation in 2024 – and we’re not slowing down. With 7M paid subscribers and the highest-rated experience in the App Store’s health category, we’ve spent 10 years earning trust at scale. Now, we’re building the next generation of digital health – AI-powered, privacy-first, clinically backed – to help our users know their body better. The job We're looking for a Senior Product Manager (Payments) to own the strategy and execution of Flo's payments and subscription platform across Web, iOS, and Android. This is a high-impact, high-visibility role at the intersection of monetisation, platform, and operations, working closely with the VP of Product (Revenue) to shape the payment foundation that will support Flo's next stage of global growth. You will work across Product, Engineering, Data, Finance, Legal/Compliance, Support, and commercial stakeholders to build payment experiences and platform capabilities that are reliable, scalable, compliant, and growth-oriented. Payments are a core part of Flo’s growth engine and a critical platform capability for the business. As we continue to scale globally, we need strong product leadership in this area to ensure our payment stack, subscription systems, and monetisation mechanics are robust, efficient, and ready for the next stage of growth. As Senior Product Manager, Payments Platform, you will play a central role in shaping that foundation. Your Experience Must have: * Significant product management experience, with strong exposure to payments, billing, subscriptions, or financial platform products * Deep understanding of online payment systems and subscription mechanics, ideally in a B2C subscription or consumer app environment * Experience with mobile subscription ecosystems, including Apple and Google billing environments * Experience with web payment providers and billing platforms such as Stripe, Adyen, Braintree, RevenueCat, or similar * Experience managing fraud and dispute processes, including chargeback mitigation and refund strategy * Strong grasp of key payments concepts such as: * Payment flows * SCA / 3DS * Tokenisation * Issuer declines * Retries and dunning * Refunds and disputes * Reconciliation * Subscription lifecycle and entitlement logic * Working knowledge of indirect tax compliance (VAT/GST) and how it intersects with subscription billing and multi-market operations * Experience working closely with engineers on platform or infrastructure-heavy product areas * Proven track record of delivering complex cross-functional initiatives in fast-paced environments * Strong analytical skills and ability to use data to diagnose performance issues, evaluate trade-offs, and drive decisions * Excellent stakeholder management, with the ability to work effectively across Product, Engineering, Data, Finance, Legal/Compliance, and Support * Ability to balance strategic thinking with hands-on execution and operational detail Nice to have: * Experience building in-house billing capabilities or implementing payment orchestration layers * Familiarity with tax determination platforms such as Avalara, TaxJar, or Vertex * Experience defining payment flows for external partner programmes (e.g. sponsored access, partner perks, third-party app stores) * Exposure to payment automation and AI applications in payments contexts (e.g. intelligent retry logic, decline prediction, dispute automation What you'll be doing You'll be responsible for: * Own the product roadmap for Flo’s payments and billing platform across Web, iOS, and Android * Define and improve the end-to-end subscription and billing journey, including: * Purchase and checkout flows * Entitlement and receipt validation * Renewals, retries, grace periods, cancellations, and refunds * Payment failure recovery and dunning * Partner with Engineering and Data to improve the performance and resilience of our payment stack, including: * Acceptance rate optimisation * Issuer decline analysis * SCA / 3DS flows * Tokenisation and retry logic * Payment method coverage and routing * Build the product capabilities, internal tooling, and automations required to support scalable and audit-friendly payment operations * Work closely with Finance and Operations teams to improve reconciliation, reporting accuracy, and process efficiency * Own the tax compliance product surface, working with Finance and Legal to ensure correct tax determination, indirect tax handling (VAT/GST), and compliance with marketplace facilitator obligations across our key markets * Identify and drive monetisation opportunities linked to the payments experience, such as checkout optimisation, refunds strategy, pricing mechanics, promos, and payment method expansion * Lead fraud and dispute management strategy, including chargeback reduction, fraud detection tooling, and refund policy optimisation * Establish clear frameworks for experimentation and decision-making, including A/B testing, KPI definitions, and performance dashboards * Align stakeholders across multiple teams and functions, balancing growth, reliability, compliance, and user experience * Act as the subject matter expert for payments and subscription platform topics within the product organisation #LI-Hybrid #LI-AJ1 Salary Range - gross per month (ranges may vary based on skills and experience) €7.300—€8.800 EUR How we work We’re a mission-led, product-driven team. We move fast, stay focused and take ownership – from brief to build to impact. Debate is encouraged. Decisions are shared. We care about craft, ship with purpose, and always raise the bar. You’ll be working with people who take their work seriously, not themselves. It takes commitment, resilience, and the drive to keep going when things get tough. Because better health outcomes are worth it. What you'll get We support impact with meaningful reward. Here’s what that looks like: * Competitive salary and annual reviews * Opportunity to participate in Flo’s performance incentive scheme * Paid holiday, sick leave, and female health leave * Enhanced parental leave and pay for maternity, paternity, same-sex and adoptive parents * Accelerated professional growth through world-changing work and learning support * In-person collaboration and work in a hybrid model, with 3 days per week spent in the office * 5-week fully paid sabbatical at 5-year Floversary * Flo Premium for friends & family, plus more health, pension and wellbeing perks Diversity, equity and inclusion Our strength is in our differences. At Flo, hiring is based on merit, skill and what you bring to the role – nothing else. We’re proud to be an equal opportunity employer, and we welcome applicants from all backgrounds, communities and identities. Read our privacy notice for job applicants.
500M+ downloads. 80M+ monthly users. A decade of building – and we’re still accelerating. Flo is the world’s #1 health & fitness app worldwide on a mission to build a better future for female health. Backed by a $200M investment led by General Atlantic, we became the first product of our kind to reach a $1B valuation in 2024 – and we’re not slowing down. With 7M paid subscribers and the highest-rated experience in the App Store’s health category, we’ve spent 10 years earning trust at scale. Now, we’re building the next generation of digital health – AI-powered, privacy-first, clinically backed – to help our users know their body better. The job As Senior Product Manager for Predictive Growth at Flo, you'll own Flo's predicted Lifetime Value (pLTV) platform across iOS, Android, and Web. pLTV is the shared signal behind UA bidding, budget allocation, creative-testing prioritisation, finance forecasting, and roadmap decisions across the organisation — making it one of the highest-leverage PM roles in growth. You'll work with a team of data scientists, machine learning engineers, and data engineers running Flo's production pLTV models across short-horizon (intra-day) and long-horizon (M15+) predictions. You'll drive accuracy improvements, expand signal coverage across platforms, and extend pLTV's reach into new decision domains. You'll also help scale Flo's in-house agentic experimentation system — already delivering 30%+ quality gains — and contribute to the next generation of Flo's marketing measurement stack, including Marketing Mix Modeling and incrementality testing. This is a senior IC role with company-wide visibility, partnering with leadership across User Acquisition, Finance, Analytics, and Engineering. It's equally hands-on in delivery: co-leading the team day-to-day with your engineering manager pair, writing the specs, defining the epics, staying close to the work. Your Experience Must have: * Proven experience owning machine-learning or data-driven products in production — predictive scoring, propensity, ranking, forecasting, or similar data-rich products. Strong fit for current Product Managers; also open to Engineering Managers, ML Engineers, or tech leads who have shaped product direction end-to-end and are ready to make the switch into a PM seat. * Hands-on delivery instincts — equally comfortable in Jira (writing specs, defining epics, refining the sprint backlog, unblocking the team) as in strategic planning and stakeholder management. Co-leads the team day-to-day with your engineering manager pair. * Hands-on partnership with data science and machine-learning engineering teams — partnering on model evaluation, retraining cadence, feature decisions, and release discipline. * Strong analytical fluency — SQL proficiency, comfort interpreting model evaluation metrics, and the habit of interrogating performance at segment, cohort, and campaign level rather than blended aggregates. * Demonstrated ability to influence senior cross-functional stakeholders across marketing, finance, analytics, and engineering — translating technical model behaviour into commercial decisions. * Comfortable in fast-paced, ambiguous environments — balancing platform investments against fast-cycle experimentation, with shifting priorities and competing demands. Nice to have: * Working knowledge of mobile and web user acquisition — how bidding, attribution, and campaign optimisation actually work, including privacy frameworks such as SKAN/ATT or Privacy Sandbox. * Hands-on experience with mobile attribution platforms (AppsFlyer, Adjust, Branch, Firebase) and modern measurement frameworks (SKAdNetwork, GA4). * Exposure to Marketing Mix Modeling, incrementality testing, holdout design, or causal inference techniques. * Familiarity with feature stores (Databricks, Tecton, Feast) and modern MLOps tooling. * Subscription-app, health & wellness, or femtech domain background. * Exposure to agentic AI or LLM-orchestrated workflows for ML experimentation, research, or model evaluation. What you'll be doing You'll be responsible for: * Owning Flo's pLTV product roadmap end-to-end across iOS, Android, and Web — driving accuracy improvements, expanding feature coverage, extending prediction horizons, and pushing pLTV into new decision domains (creative testing, product roadmap, pricing, hypothesis validation) alongside its existing UA and Finance use cases. * Partnering with data scientists and engineers on feature strategy — deciding which inputs the model consumes and ensuring those features are available reliably in production. * Operating rigorous release discipline — gated rollouts, shadow-mode evaluation, drift detection, automated retraining, and post-launch calibration — so production models stay accurate as data distributions and platform policies evolve. * Working closely with data scientists and analysts to investigate model quality issues — country-level miscalibration, cohort drift, signal anomalies — and feeding findings back into the next iteration. * Helping scale Flo's agentic ML experimentation system from hundreds toward thousands of model runs — compounding quality gains back into production. * Acting as the primary product partner to User Acquisition leadership — translating model behaviour into bidding decisions, framing trade-offs, and aligning on attribution-window strategy. * Reporting model performance and strategic recommendations into monthly leadership reviews and quarterly investment decisions. * Contributing to Flo's next-generation measurement stack — including Marketing Mix Modeling, incrementality testing, and causal lift methodology — so marketing investment decisions are grounded in causal, not correlational, signal. #LI-Hybrid #LI-AJ1 Salary Range - gross per month (ranges may vary based on skills and experience) €7.300—€8.800 EUR How we work We’re a mission-led, product-driven team. We move fast, stay focused and take ownership – from brief to build to impact. Debate is encouraged. Decisions are shared. We care about craft, ship with purpose, and always raise the bar. You’ll be working with people who take their work seriously, not themselves. It takes commitment, resilience, and the drive to keep going when things get tough. Because better health outcomes are worth it. What you'll get We support impact with meaningful reward. Here’s what that looks like: * Competitive salary and annual reviews * Opportunity to participate in Flo’s performance incentive scheme * Paid holiday, sick leave, and female health leave * Enhanced parental leave and pay for maternity, paternity, same-sex and adoptive parents * Accelerated professional growth through world-changing work and learning support * In-person collaboration and work in a hybrid model, with 3 days per week spent in the office * 5-week fully paid sabbatical at 5-year Floversary * Flo Premium for friends & family, plus more health, pension and wellbeing perks Diversity, equity and inclusion Our strength is in our differences. At Flo, hiring is based on merit, skill and what you bring to the role – nothing else. We’re proud to be an equal opportunity employer, and we welcome applicants from all backgrounds, communities and identities. Read our privacy notice for job applicants.