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# Senior .NET Developer (Desktop/SDK)

- **Company:** Proton
- **Location:** London, UK (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Microsoft Windows, Apple Mac Systems, Applications Architecture, Application Lifecycle Management, Software Applications, Automation of Tests, Computer Programming, Linux, File Systems, Fault Tolerance, HP Systems Insight Manager, Backend, Gitlab, Git
- **Published:** August 4, 2026
- **Apply:** https://uk.indeed.com/viewjob?jk=02e66f6a0c4066ed

## About the Role

* Strong experience in .NET development
 * Strong experience with concurrent multi-threaded programming
 * Optional experience building and maintaining desktop applications
 * Working knowledge of file systems
 * Working knowledge of Git
 * Bachelor's or master's degree in a relevant field of study
 * Experience with owning and maintaining large software components
 * Experience with gradual rollouts and metrics/monitoring/alerting frameworks

## Description

You will be responsible for designing, building, maintaining and evolving the sync SDK powering Proton Drive's desktop applications. This includes not only building the application internals (managing and syncing local and remote state, performing cryptographic operations, etc) but also helping us to build resilient, scalable applications (graceful degradation; log and metrics streams free of personally identifiable information). You will be involved in the entire application lifecycle, but with a strong focus on the internals shared amongst our desktop applications, including Gitlab configuration, deployments, monitoring and alerting, and operational incident response. While this position is not a "full-stack" position, you will be expected to collaborate with backend engineers to drive any necessary changes and/or new features needed for the core of our desktop experience.
What you will do:

 * Be part of a small team working to bring a "privacy by default" solution to our Drive clients on Windows, macOS and Linux.
 * Develop applications that delight a wide range of users, from layperson to technical, and gives confidence that their online privacy is in good hands - while getting the complexity of end-to-end encryption out of the way.
 * Invest in test automation to improve the team's productivity and software delivery cadence.
 * Think critically on how to divide problems into iterations of simpler, composable solutions. Re-evaluate the minimum scope as necessary to meet objectives on-time.
 * Insist on high standards for application monitoring and alerting, in order to ensure a smooth customer experience at all times.


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