About the role
API Platform builds the surface that developers and Clexerl's own products use to reach our models. That covers the request and streaming protocols, authentication, rate limits, usage metering, SDKs and the reliability work that makes an API something you can build a business on.
Every Frontier AI capability eventually becomes an endpoint, and Clexerl Go consumes the same platform as any outside developer. That keeps us honest: if tool calling, structured outputs or long-lived context are awkward to use, we feel it first. Good API design is how research becomes something other people can ship.
We design in the open internally, with written proposals and example code before implementation. Backwards compatibility is a commitment, so we version carefully and deprecate slowly.
What you’ll do
- Design and implement API endpoints for generation, tool use, structured outputs, batch processing and file handling, with clear semantics and error models.
- Build streaming responses over server-sent events and similar transports, handling cancellation, resumption and backpressure correctly.
- Own rate limiting, quota enforcement and usage metering, including fairness across tenants and accurate billing data.
- Maintain SDKs and OpenAPI specifications so client libraries stay consistent and idiomatic across languages.
- Raise availability and lower tail latency through load shedding, retries with idempotency keys and careful dependency isolation.
- Partner with research and inference teams to expose new model capabilities safely.
What you’ll bring
- Several years building production web APIs in Go, Python, Rust, TypeScript or Java, with a record of clean interface design.
- Solid grasp of HTTP semantics, authentication schemes, idempotency and versioning strategies.
- Experience with multi-tenant systems, including isolation, rate limiting and abuse resistance.
- Practical experience with observability: tracing, metrics and structured logging used to find real production faults.
- Taste for developer experience, shown by documentation, error messages and examples that reduce support questions.
- Willingness to be accountable for uptime, including the occasional out-of-hours page.
Nice to have
- Experience designing streaming or long-running job APIs with resumable semantics.
- Familiarity with usage-based billing pipelines and reconciliation.
- Background in API security, such as scoped keys, request signing or audit logging.
- Experience generating SDKs from specifications.
Work you might take on
- 01
Design a resumable streaming protocol so a dropped connection mid-generation can reattach without repeating or losing tokens.
- 02
Rebuild per-tenant rate limiting around token-aware budgets that account for both input size and generated output.
- 03
Ship a batch endpoint with idempotent submission, partial-result retrieval and clear failure reporting for large offline workloads.
- 04
Create a compatibility test suite that runs every SDK against the live API and blocks releases that break documented behaviour.
Compensation
$260K – $420K
The US base salary range for this role. Every offer also includes equity in Clexerl and, when it spins out, in the venture you help build. We tell you the reasoning behind your number.
Benefits
Health, fully covered
Medical, dental and vision for you and your dependants, premiums paid in full.
Two kinds of equity
Equity in Clexerl, plus a stake in the venture you help build when it spins out.
22 weeks parental leave
Fully paid, for every parent, however your family arrives.
Rest that sticks
Flexible time off with a four-week minimum we actually check on, plus a company-wide week in December.
Learning and compute
A yearly budget for courses, conferences and books, and compute credits for side projects.
401(k) with a 4% match
Matched from your first paycheque and vested immediately.
How we hire
Apply 5 minutes
Send links to what you have built and a few lines on why this role. No cover letter needed.
Intro call 30 minutes
A conversation with the hiring manager about the work, the team and what you want next.
Work sample 2–4 hours
A paid take-home or a pairing session on a real-shaped problem. You pick the format.
Studio day One day
Meet the team, go deep on your work and ours. Remote or in person.
Offer Within 5 days
A written offer with the full range, the equity and the reasoning behind both.
Opens an email with a short template. Links beat résumés.