Software Engineer 3

About this role

MongoDB is seeking a Software Engineer 3 to build developer tooling and quality infrastructure for AI agents, including evaluation systems, CLI tools, CI/CD integration, and safety gates. You'll own the platform layer for authoring, distributing, and improving agent skills across the organization.

What you'll do

• Build and maintain agent skills infrastructure, validation frameworks, and publishing pipelines
• Design evaluation datasets and workflows that measure agent behavior against baselines and generate quality signals
• Develop agent metrics and observability systems for skill routing, outcomes, tool calls, latency, and token usage
• Create safety and quality gates for agent-authored content using rule packs, static analysis, and confidence thresholds
• Build CLIs, libraries, and MCP integrations adopted across repositories for local development and CI
• Investigate production failures and convert findings into reusable improvements and anti-pattern detection

What they're looking for

• Production software development and internal platforms
• CLI and library design for developer usability
• Test infrastructure, static analysis, and CI/CD workflows
• API design with strong error handling and maintainability
• System design for correctness with ambiguous or nondeterministic inputs
• Go, Python, JavaScript/TypeScript, Java, or C#
• GitHub Actions and secrets management
• LLM evaluation harnesses and quality metrics (nice to have)