Lead Software Engineer (API/Agentic)

Spend most of your time writing, reviewing and shipping production backend code.Use agentic coding tools as a core part of your daily workflow, including AI-assisted code review, automated test generation and AI-augmented development, while keeping code quality, security and human oversight in place.Design and build APIs and services end to end, from technical approach and API contract through implementation, testing and release.Contribute to backend architecture across our C#/.NET and Python services, keeping them modular, maintainable and testable.Define clear, versioned API contracts that client teams on iOS, Android and desktop can consume easily.Work closely with Product Management, UX and client engineers to take defined features from spec to shipped, raising technical tradeoffs and feasibility early.Optimize service performance and scalability, including latency, throughput, database query efficiency, caching, concurrency and cloud cost.Write and maintain automated unit, integration and contract tests for your services.Drive CI/CD automation, release quality and deployment processes for containerized cloud services.Ship behind feature flags with progressive rollout and kill switches, and validate new behavior with production telemetry before ramping up.Own service health through observability, tracking SLOs, error rates, latency budgets and defect trends, and take part in on-call and incident response.Take part in code reviews and share knowledge with other engineers.Evaluate new backend, cloud, AI and tooling technologies, and recommend adopting them where they would meaningfully improve the team's work.