Frontend Engineer (Lumo)

ppJoin Proton and build a better internet where privacy is the default /p pAt 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 been dedicated to providing free and open‑source technology to millions worldwide, ensuring access to privacy, security, and freedom online. /p pOur journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, Proton Pass, Proton Wallet, and Lumo by Proton. 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. /p pProton is a profitable company that does not rely on VC funding, supporting over 100 million users with a growing team of more than 500 people from over 50 countries. We value intelligence, learning potential, and ambition in our hiring process. /p h3About Lumo /h3 pLumo is Proton’s privacy‑first AI assistant that fundamentally reimagines how AI should work—empowering users without exploiting their data. Unlike traditional AI platforms that harvest user conversations for training and profit, Lumo operates with zero‑access encryption, keeps no server‑side logs, and ensures conversations remain completely confidential. /p pBuilt by the team behind Proton Mail and Proton VPN and backed by the nonprofit Proton Foundation, Lumo represents a paradigm shift in AI development. We believe the benefits of AI are too great to miss, but the privacy risks of current implementations are too serious to ignore. Lumo is based on open‑source language models, operates from Proton’s European datacenters, and provides unprecedented transparency. /p pbOur Mission /b: To deliver the full power of artificial intelligence while maintaining user privacy as an uncompromising core principle. We’re building an AI that only works for you, not the other way around—your conversations remain confidential and your data stays fully under your control, never shared, sold, or stolen. /p pbOur Technology /b: Lumo implements multiple layers of encryption throughout the entire pipeline, from device‑to‑server communication through to long‑term storage, creating a privacy architecture that is simply much stronger than anything else on the market. The platform runs on open‑source models including Mistral’s Nemo and Nvidia’s OpenHands 32B, with full source‑code transparency. /p h3Role Summary /h3 pWe are seeking a passionate and skilled Frontend Engineer to join our growing Lumo AI team. You’ll work across all functions of Lumo, turning designs into responsive, fast, and reliable interfaces. Your code will shape the day‑to‑day experience of users, making it smoother, clearer, and more enjoyable. /p pbFull Stack Engineering /bbr/Create, evolve, and sustain high‑performance features that tie together the front‑end and back‑end layers of our modern stack. Ensure every component scales smoothly and integrates cleanly. /p h3What You Will Do /h3 ul liTurn UI mockups into production‑ready React components. /li liIntegrate those components with our backend services using TypeScript and modern data‑fetching patterns. /li liOptimize performance so pages load instantly even on slower connections. /li liCollaborate closely with product managers, designers, and other engineers to ship features end to end. /li liOwn the quality of your work: write tests, document decisions, and participate in code reviews. /li liSpot friction in the user journey and fix it before it becomes a complaint. /li /ul h3What we expect /h3 ul liStrong expertise in React. /li liSolid grasp of TypeScript and JavaScript fundamentals. /li liExperience with state‑management and data‑fetching libraries. /li liAbility to produce clean, maintainable code without cutting corners. /li liGood communication skills and a willingness to give and receive honest feedback. /li liA proactive attitude—identify problems and solve them without waiting for direction. /li /ul h3Nice to have /h3 ul liExposure to AI or large language model products. /li liPython scripting for tooling or data tasks. /li liKnowledge of distributed systems and observability stacks. /li liHands‑on experience with design tools such as Figma. /li /ul h3Why Join Lumo /h3 pYou’ll be joining a mission‑driven team at Proton, trusted by over 100 million people worldwide and owned by the nonprofit Proton Foundation. This role offers the opportunity to shape the future of AI by building full‑stack infrastructure that proves privacy, performance, and reliability aren’t mutually exclusive. /p pAs a Frontend Engineer at Lumo, you’ll own the complete technical stack powering privacy‑first AI experiences, ensuring millions of users can rely on Lumo for their most sensitive conversations with complete confidence in both AI capabilities and privacy protection. /p pEven if you don’t meet all the requirements listed above, but feel you could still be a great fit, please still apply. /p h3What We Offer /h3 ul libWork that Matters /b: millions of people trust Proton with their privacy. We answer only to our users—your work is real and its impact is measurable. /li libTechnology /b: you’ll receive the right hardware and software you need to do your best work. /li libLearning Development /b: we invest in your growth because sharp people make us better. Proton is one of the fastest ways to accelerate your career. /li libEmployee Benefits /b: strong health coverage, solid retirement options, generous leave, and wellness support. /li libStock Options /b: you have a real stake in what we’re building. /li libIn‑Person Collaboration /b: offices across Geneva, Zürich, Barcelona, London, and more. You’ll spend time collaborating face‑to‑face with passionate, smart, and purposeful people. /li libFood /b: lunch and snacks are provided daily in our offices. /li libTransport /b: we cover public transport, bike allowances, or parking. /li libFlexible Working /b: you own your schedule. Set hours that work for you and your team—outcomes matter more than clock‑in times. /li /ul h3Our Commitment to Diversity and Inclusion /h3 pAt 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. /p pWe strive to create equal opportunities, promote open dialogue, and support continuous learning to ensure every voice is heard and respected. /p h3Candidate Privacy Notice /h3 pWhen you apply for a position, your information is stored in Greenhouse in accordance with their Service Privacy Policy. This information is used to assess your suitability for the posted position and may be retained for future roles that align with your background and skills. If we no longer have a legitimate business need to process your information, we will delete or anonymize it. For inquiries or to exercise your rights, contact our privacy team at /p h3Additional Support /h3 pIf you need any extra support or reasonable adjustments during the hiring process, please let your talent partner know. /p /p #J-18808-Ljbffr