Senior Software Engineer (Inbox Desktop)

Proton

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 As a Front-end Engineer at Standard Notes, you will play a crucial role in evolving our platform into the leading secure note-taking, knowledge management, and productivity solution. We are seeking a senior engineer who is passionate about client-side architecture, system design, and usability, and who thrives in a highly collaborative environment. You’ll work closely with Product, Design, API teams, and fellow engineers, driving data-informed decisions to deliver a seamless and secure user experience. Current Projects: The Standard Notes team is focused on building a comprehensive suite of tools to help users manage their knowledge and boost productivity while maintaining the highest standards of security and privacy. Recent efforts include advancing editor capabilities, improving data organization features, and optimizing cross-platform sync. You’ll work on architecting features such as encrypted search, tagging systems, advanced note formatting, and seamless integrations—all built with React and TypeScript and secured with end-to-end encryption. Tech Stack and Tools: • JavaScript, TypeScript, React, ES6, Playwright, Jest, Grafana • All Standard Notes codebases are open source: https://github.com/standardnotes Encryption presents unique challenges to front-end development. Features like search and syncing are designed to function entirely within a secure and encrypted environment, pushing the boundaries of what’s possible in privacy-first software. Future Plans: As a team, we aim to continuously enhance the quality and performance of Standard Notes, transforming it into a feature-rich platform that caters to the diverse needs of both individuals and businesses. This includes improving knowledge management capabilities, expanding organizational tools, and creating integrations that enhance workflows—all while remaining committed to our core values of security, privacy, and simplicity. What You Will Do: • Develop, deploy, and support high-quality user experiences across our product portfolio, including features that enhance knowledge management, productivity, and data organization. • Transform product specifications into technical requirements and lead your team to their successful implementation. • Enhance Standard Notes’ development lifecycle, tools, and code structure for an improved developer experience through technical leadership and architecture. • Write clear, concise, and testable code to maintain and elevate the quality of our codebase. • Scope, plan, and execute new features, technical initiatives, and greenfield projects (depending on seniority). • Foster a culture of learning, creativity, and accountability for the best possible work through mentorship and team development, role modeling quality assurance, and performance optimization. Job Requirements: * Deep understanding of JavaScript methodologies and design patterns * Proficiency with TypeScript or any typed language * Experience with React or 2+ similar frameworks, developing performant and reusable components * Strong understanding of software engineering best practices, such as SOLID, Design Patterns, CI/CD * A product mindset with a focus on offering the best user experiences * Experience working in a distributed team Bonus points for:  * Awareness of common security issues in client-side development, such as those in the OWASP top ten, and how to mitigate them * Familiarity with UX, accessibility, internationalization, and localization concerns and solutions * Experience with Grafana or other monitoring platforms * Experience with breaking down product requirements into architecture design and implementation * Experience with NodeJS * High-level understanding of cryptography concepts such as key exchange and the difference between symmetric and asymmetric encryption  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

Rohlik Group

Finance at Rohlik is being rebuilt to run on AI. We already have agents in production that chase overdue payments, process invoices, allocate cash and clear the team's inbox. The pieces work. What we need now is one person to own the whole thing and make it deliver at scale.   ROLE OVERVIEW This is a new role that owns how AI and automation reshape of the finance operating model across the Group. You will take a programme that is already live across procure to pay, order to cash and our shared services centre, and turn it from a set of promising experiments into the way finance actually runs. You report to the Group CFO. You inherit a small team and a live roadmap, and you own the result. You decide what gets automated first, you build and ship with AI tools when that is the fastest way, and you hold every workstream to a number. The role is deliberately hands on. You should be close enough to the work to build an agent or connect two systems through an API with AI assistance, even though you are not a software developer. You should also be senior enough to redesign how finance works and bring the rest of the business with you.   WHY THIS ROLE IS EXCITING * You’ll inherit a live AI programme with real agents, real data and real impact from day one — not a greenfield slide deck. * You’ll shape how Finance actually runs across the Group as we move toward the next stage of growth — including the journey toward IPO readiness. * You’ll have access to a top-notch AI-first tech stack and the freedom to use it pragmatically. * You’ll work directly with the Group CFO, with fast decisions and no corporate red tape. * Your good ideas will be implemented almost immediately — not parked in a roadmap waiting for HQ approval. * You’ll lead a small team, but this is not a “manager from a distance” role. It’s highly hands-on, high-impact, and built for someone who wants to make things move fast.   WHAT WE EXPECT FROM YOU * Own the AI and automation agenda across finance, from strategy through delivery to measured impact. * Lead process redesign the right way: map and understand the as-is, then design an agentic-first to-be rather than automating the old steps. * Bring the live programme to its targets, with a clear owner, baseline and deadline behind every workstream. * Redesign core finance processes around AI and agents, starting with close, reporting and forecasting. * Build and ship yourself when it is faster, using AI assisted tools to create agents and connect systems such as NetSuite, Rossum and n8n. * Lead and grow the team (three today) and raise AI fluency across finance and the SSC so the business can use what you build. * Track what matters and report it straight: automation rate, close time, cash allocation speed, cost and effort taken out. * Roll out across our five markets, balancing local reality against one Group standard.   WHAT WE LOOK FOR You have probably spent time in strategy consulting or in a transformation role, and you are now genuinely excited by what AI can do. You are a sharp generalist who can walk into a messy process, find the real problem, and fix it. You are as comfortable in a CFO pre-read as you are in the AI first tool building the thing. * A track record of leading transformation or automation programmes that actually delivered. A consulting, operations or generalist operator background all fit. * Hands on with AI. You can build agents and integrate APIs with AI assistance. You are not a software engineer and you do not need to be, but the tooling does not scare you. * A good grasp of how a finance function runs, or the speed to learn it fast. * You set baselines, name owners, hit deadlines, and say so early when something slips. * You can lead a small team and still do the work yourself. * You prioritise by impact and move fast. Better done than perfect. * You bring finance, tech and operations along with you. * Fluent in English. other languages will be an advantage. * Regular travel to Prague HQ required (min. 4 days per month) WHAT WE OFFER * Unlimited vacation days to support a healthy work-life balance * Monthly vouchers: €45 tax-free via become.1 * €20 monthly internet allowance * Knuspr Xtra account and 10% discount in the form of Knuspr credits / cashback * Great discounts through Corporate Benefits – fitness, travel, tickets, shopping and much more * Real growth: we’re not a traditional corporate. * Knuspr vibe: an international team, flat hierarchy, and a first-name culture where mistakes are seen as opportunities to learn

Proton

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 700+ 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 TEAM Our business unit, Inbox, is a cross-functional team of about 60 engineers, product managers, designers, and data analysts driving the development of Proton Mail, the company's flagship product, and Proton Calendar. Our mission is to create an end-to-end encrypted solution with a better user experience than any other productivity product on the market. It is not always an easy journey, but it is one that offers the chance to create meaningful impact and drive lasting change. The Platform team is a subteam of Inbox, responsible for the core components reused across Mail and Calendar. Rather than owning a single feature, the team builds the shared foundations, the tooling and systems other Inbox teams build on top of, so that Mail and Calendar can scale reliably. Over the next year, the team's priority is efficiency and cost reduction. The Platform team is partnering with the product team on new systems, such as how client apps receive updates from the server (e.g. new email and calendar event delivery), while also improving the performance of systems already in production. Quality and performance are treated as first-class concerns in everything the team ships, not an afterthought.   PURPOSE OF THE ROLE As a Senior Backend Engineer on the Platform team, you'll bring hands-on experience with data-driven delivery, monitoring, and how the team plans and prioritizes its work. You'll work closely with the product team to design new systems, and with the rest of the team to improve the performance of what's already running. WHAT YOU WILL DO * Architect and develop core systems: Design and build core, cross-product systems shared by Proton Mail and Calendar, with scale and cost-efficiency as first-class constraints. * Performance: Improve the performance of existing systems, using monitoring and metrics to identify where time and infrastructure spend are going and where to cut. Drive cost-reduction and efficiency initiatives across shared platform components, from proposal to production * Data-driven delivery: Bring a data-driven approach to technical decisions and delivery planning, shaping how the team measures and prioritizes its work * Collaboration: Work closely with a team of backend and clients engineers, with a strong emphasis on quality and performance in everything shipped * Testing: Develop and implement comprehensive testing strategies, including unit tests and integration tests, to ensure the reliability of core systems.   JOB REQUIREMENTS * Strong experience in backend development, with a track record of designing, building and scaling systems that serve a large user base (100M+) * Demonstrated ability to improve the performance and cost-efficiency of systems already in production * Hands-on experience with monitoring and observability tooling (e.g. Grafana, OpenTelemetry, or equivalent), and a data-driven approach * Solid understanding of SQL (MySQL preferred) and data modeling * Experience leading a technical initiative end-to-end, from design through production BONUS POINTS FOR * Experience with client-server sync or push-notification systems * Experience with Kubernetes or other containerization technologies * Experience with PHP/Symfony, Rust, or Python * Full-stack experience, comfortable working across the frontend as well as the backend What We Offer * Work that Matters: millions of people trust Proton with their privacy. We answer only to our users — not advertisers, not investors with conflicting agendas, not governments. The work you do here is real, and the impact is measurable. (read more about our impact here) * Stock Options: at Proton, we all have the opportunity to be owners of the company. From day one, you have a real stake in what we're building. When Proton wins, you win. * Technology: you'll get the right hardware and the right software you need to do your best work. * Learning & Development: we invest in your growth because sharp people make us better. Proton is one of the fastest ways to accelerate your career because you'll be thrown into real challenges, with real ownership, from day one. * Employee Benefits: your wellbeing isn't an afterthought. We offer strong health coverage, solid retirement options, generous leave, and wellness support so you can bring your best self to work every day * In-Person Collaboration: Amazing things happen when passionate, smart, and purposeful people get together in the same room. 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 * Food: Lunch and snacks are on us every day in our offices so you can focus on the work and not on what's for lunch. * Transport: getting to the office shouldn't cost you. We cover public transport, bike allowances, or parking, whichever works for you. * Flexible Working: you own your schedule. Set hours that work for you and your team — because outcomes matter more than when the 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  Paris : 54,000€ - 83,000€ gross annually* Other locations: Compensation will be discussed during the interview process *Final compensation will be determined based on the candidate's qualifications, skills, and previous experience #LI-Onsite