A better internet, where privacy is the default, is possible. Building this better internet might seem daunting or even unthinkable, but at Proton, this is what we do every day.Proton was founded in 2014 by a group of scientists who met at the European Organization for Nuclear Research (CERN). Our first product, Proton Mail, is now the world's largest encrypted email service.Subsequent Proton products, such as Proton VPN, Proton Calendar, and Proton Drive, give our users full control over how and with whom their data is shared.Today, Proton makes privacy universally accessible. Journalists from outlets like The Guardian and The New York Times, some of the world's largest organizations, and people in more than 180 countries have signed up for over 70 million accounts.Our diverse and dynamic team is made up of more than 400 members representing over 40 different nationalities. While we are based in Geneva, Switzerland, we have offices in Zurich, Prague, London, Vilnius, Skopje, Taipei, and many more employees working remotely around the world.Join one of Europe's fastest-growing companies to help us solve challenging problems and build new products that will reach hundreds of millions of people. We want to create more than just one of the world's most impactful tech companies; we want to create a new internet that serves the interests of all people.We need you, your voice, your ideas, and your ambition to make it happen.Purpose of the Role:ProtonVPN runs on a distributed architecture of Linux servers and a set of apps available on each major platform (Windows, Android, iOS, macOS, and Linux) that interact with our infrastructure.As a member of the ProtonVPN Research and Development team, you will work with your team to crack all the various challenges related to censorship, such as censorship of VPN access itself, operated by various regimes across the globe.On any given day, you might code in C or Rust, script in Python or Lua, create patches for the Linux kernel, or debug system-level issues on different operating systems. You will work in close collaboration with the entire ProtonVPN development team on any outstanding projects. You will face unique and varied challenges that will require continuous learning.What You Will Do:Being an active member of the ProtonVPN R&D teamCollaborating with app developers to help solve the various complex challenges related to (but not limited to) the networking stack of Linux, macOS, iOS, Android, and Windows systemsHelping develop innovative solutions to improve the connectivity, stability, performance, scalability, security, and resilience in the most adverse network conditions of ProtonVPN's infrastructure and client software, and extend their functionalityContributing to existing open-source projects or creating new onesJob Requirements:Expert-level knowledge of operating system internalsExpertise with network protocols and implementation (UDP and TCP stacks)Experience with system programming languages (C / C++, Rust, Go, Python, Lua, etc.)A documented track record of contributions to system-level projects and applicationsExperience with software development and system designUnderstanding of the principles of quality assuranceKnowledge in the Following Areas is Considered a Plus:Expertise in Windows, macOS, or Linux system developmentExtensive experience working with Linux kernel, Windows drivers, or macOS system extensions developmentStrong understanding of system programming languages (C / C++, Rust, Go, Python, Lua, etc.)Experience with debugging code and code profilingGood understanding of TCP / IP protocol and settings (e.g., congestion algorithms)Strong understanding of VPN protocols (particularly OpenVPN and WireGuard)Experience with cryptography concepts (e.g., TLS certificates and public key infrastructure)Why Should You Join Proton?Be part of a movement - Proton is not just a product or service but a community-driven movement united by a shared vision of online freedom.Work with smart and dedicated people - Our team is diverse, collaborative, and tight-knit with people coming from all walks of life, including many of the world's top academic institutions and organizations.Join a strong brand - Our encrypted email service - Proton Mail - has grown to be a staple of online security and privacy.Grow with us - We're one of Europe's fastest-growing startups, doubling in size every year.Have your voice heard - We value your opinion and encourage you to speak up and share your ideas and thoughts.Benefits vary by location and type of contract but expect support on your vacation, parental leave, refreshment if working from the office, learning and development opportunities, equity for shared success, flexible working hours and remote work, company events and team building activities.
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