Platform Engineer, APIs – Observability

StackAI

Platform Engineer developing public APIs and analytics tools for AI workflows at Stack AI. Focused on observability, API design, and user experience for developer engagement.

Posted 6/19/2026full-timeSan Francisco • California • 🇺🇸 United StatesMid-LevelSenior💰 $180,000 - $200,000 per yearWebsite

Tech Stack

Tools & technologies

JavaScriptNode.jsPythonTypeScript

About the role

Key responsibilities & impact

Help build the public API as a product. Design, version, and evolve the API and SDKs that Stack AI customers build on, and keep the developer experience first-class.
Set our API standards. Help define the conventions, versioning and deprecation policy, and review bar that keep every API across the platform consistent and predictable.
Make agent runs observable. Build tracing and instrumentation that let anyone follow a single agent run end to end, across its models, tools, and sub-agents.
Turn usage into analytics customers act on. Build the reporting that shows customers how their agents perform, what they cost, and where to improve.
Own the audit trail. Build the audit logging and team-scoped views enterprises rely on.

Requirements

What you’ll need

4+ years building backend services and public APIs in production.
Strong API craft: RESTful design, SDK ergonomics, and rate limiting.
You speak fluent OpenAPI — experience defining API standards and governance: versioning, deprecation, and consistency across services.
Fluency with observability and analytics: distributed tracing, metrics, and turning raw signals into data products people rely on.
Strong in Python and modern backend frameworks (FastAPI or similar), comfortable across TypeScript/Node.js on the product surfaces.

Benefits

Comp & perks

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Hard Skills & Tools

API developmentbackend servicesRESTful designSDK ergonomicsrate limitingOpenAPIdistributed tracingmetricsPythonFastAPI