Senior Software Engineer - Platform, API

Meanwhile is looking for a Senior Software Engineer to take the public API and MCP server from prototype to a secure external product with authentication documentation and developer experience

You will own the public API and MCP server end to end, from resource modeling and versioning through security, performance, documentation, and developer experience. You will build the auth model, safety controls, sandbox, and guides that partners and their agents build against, writing Python against PostgreSQL.

• Design and build the public API including resource modeling, versioning, idempotency, pagination, error taxonomy, and webhooks
• Build the MCP server exposing platform capabilities to agents safely
• Own authentication and authorization using OAuth 2.0 / OIDC, scoped credentials, and tenant isolation
• Build rate limiting, quotas, abuse detection, input validation, request signing, and audit logging
• Design for scale with latency budgets, caching, backpressure, SLOs, and observability
• Write documentation and integration guides
• Build sandbox, example integrations, changelog, and partner support path
• Partner with engineering teams to shape internal services into a coherent external contract
• Write production Python code against PostgreSQL
• Participate in a business-hours on-call rotation

• 10+ years of professional software engineering experience
• Experience designing and operating public or partner-facing APIs
• Depth in API security including OAuth 2.0 / OIDC and tenant isolation
• Experience scaling an API surface in production
• Ability to produce third-party documentation
• Strong Python and relational database experience
• Experience supporting external integrators
• Fluency with AI development tools
• Low-ego approach and high bar for precision
• Based in the SF Bay Area with ability to work in-office 3 days per week

• Fully covered health, dental, and vision for you and your family
• Meals provided in office
• Two annual company off sites (fully paid)