Sonar - Staff Software Engineer (Java) - AI & Developer Experience
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Requirements
• Deep Engineering Foundation. You have significant professional experience (typically 7+ years) in one of the following ecosystems: Java (JVM internals, IntelliJ Platform UI / Compose), TypeScript (Node.js, VS Code Extension API), C# (.NET, Visual Studio Extensibility). You are a specialist in one but capable of learning and contributing to the other as needed. • Systems-Level Thinking. You understand the complexities of asynchronous programming, concurrency, and Inter-Process Communication (IPC). Experience with LSP (Language Server Protocol) and/or MCP (Model Context Protocol) is a plus. • Product-Minded Engineering. You don't just "take tickets." You are passionate about the impact of your work. You proactively bring new ideas to the roadmap and care about "Zero Friction" flow, understanding that if we slow down the Agent or the Human, we constrain the value we add. • Vision for "Agentic" Coding. You understand that the role of the IDE is changing. You want to build the infrastructure that allows AI to be autonomous and safe. • Collaborative Leadership. You have experience guiding engineers toward technical excellence and enjoy fostering a culture of empathy, continuous learning, and "dogfooding" our own tools. • Additional comments • This role is based in Geneva, Switzerland. We are unable to consider candidates unwilling to be in Geneva, but we are willing to relocate the right candidate.
Responsibilities
• Build the Real-Time Feedback Loop. You will design and implement intelligent guidance systems that proactively steer both developers and AI agents toward secure patterns. Your mission is to ensure that security flaws and architectural drift are eliminated before a PR is opened. • Lead the Technical Evolution. You’ll drive architectural decisions for the IDE Extensions and their backend. You will solve for hard constraints: managing memory and CPU footprint, providing low-latency responses, and ensuring we never block the UI thread to protect the engineer's flow state. • Architect the "Context Engine" for AI Agents. You will contribute to the development of the Sonar MCP Server and Sonar CLI, allowing local AI Agents (like Cursor, GitHub Copilot, Claude Code, etc.) to "ask" for project rules and security context before they generate code. • Champion a Unified Experience. You will ensure our tools feel "native" in every IDE while sharing a robust logic core. You will bridge the gap between platform-specific implementations (TypeScript/C#) and our shared backend (Java) to prevent feature fragmentation across the ecosystem. • Act as a Technical "Force Multiplier." Beyond writing code, you’ll mentor the squad through design reviews and collaborate with the Code Quality and Security teams to ensure our static analysis engine runs efficiently in a live, local environment.
Benefits
• We encourage usage of our robust time-off allocations with 27 PTO days for our employees based out of the Geneva region, plus additional days based on seniority and circumstances. • We contribute 60% of the total cost for your pension; 13.5% to 15.5% of your base salary for savings; 2% for risk. • Generous discretionary Company Growth Bonus, paid annually. • Commuting:Sustainable mobility options, including carpooling and the refund of 60% of the annual transportation subscription. • Global workforce with employees in 20+ countries representing 35+ unique nationalities. • We have an annual kick-off somewhere in the world where we meet to build relationships and goals for the company. • We value diversity, equity, and inclusion
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