Backend developer AI-spec-driven development

Jet Brains develops developer tools that automate routine checks and corrections, helping developers work faster and create software more effectively. Think Rail is an open-source alpha project within Jet Brains' Innovation Hub that develops a declarative programming language and infrastructure for AI-spec-driven development.

• Build and evolve Think Rail’s developer tooling, including VS Code and IntelliJ IDEA plugins
• Develop the language server, including analysis, completion, diagnostics, and verification
• Improve the evaluator that turns specs into code and detects spec-code drift
• Integrate Think Rail with AI agent frameworks and protocols such as Koog, Lang Graph, Spring AI, MCP, and ACP
• Work closely with the founder and help shape technical decisions as the product evolves

• Senior backend or full-stack engineering experience
• Ability to work independently and take ownership of complex problems
• Strong engineering fundamentals
• Experience working with Type Script or comparable background
• Comfort working in a small, fast-moving team with a high degree of autonomy
• Nice to have: experience with developer tools, DSLs, static analysis, LSP, editor plugins, or AI agents

• Remote work is available from Germany
• Office locations are available in Belgrade, Berlin, Limassol, Munich, Paphos, Prague, Warsaw, and Yerevan
• No conditions specified