.Join Proton and build a better internet where privacy is the defaultAt 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.Purpose of the role:As a Senior Backend Engineer at Proton, you will play a crucial role in developing Proton's most vital services and serving over 100 million users worldwide. We expect you to be customer-centric, continuously learning, passionate about technology and usability. You are adept at turning technical complexities into seamless user experiences. Effective teamwork, collaboration with Product, Design, APIs, and your team, and data-driven decision-making are essential aspects of this role.Job requirements:Experience with PHP-based entry-points to a back-end software stackExperience building scalable solutionsExperience with profiling methods and toolsExperience leading a team initiative from discovery to productionSolid understanding of SQL (MySql preferred) and data modellingSolid understanding of Redis or other caching technologiesSolid understanding of security best practicesSolid understanding of HTTP/REST, including both developing and consuming Web-based APIsHigh-level understanding of cryptography concepts such as key exchange and the difference between symmetric and asymmetric encryptionOperational experience such as SRE or on-call, demonstrating ability to diagnose and troubleshoot complex problems for critical systemsExperience with Docker or similar containerization technologiesExperience with metrics graphing/analysis toolkits such as Grafana and OpenTelemetryExperience with Python and/or RustExperience with OpenAPI specs or other API documentation frameworksEven if you don't meet all the requirements listed above, but feel you could still be a great fit, please still apply.What We OfferOffice First: Collaboration is easier and more effective in person, which is why we have offices in various locations. You can also enjoy working from home up to 30% of the time.Technology: We provide all the devices and software you need to excel in your role.Food: Lunch and snacks are provided by Proton every day at our offices.Transport: We support our employees with transport costs