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About the Role
The open AI evaluation platform is redefining how the world's leading AI labs measure model performance. They are building an AI gateway that gives developers access to multiple model providers through a unified endpoint. You’ll help build the platform infrastructure that turns their research advantage into enterprise products. This is a founding role on the developer team, working directly with founders and early customers to define product direction.
Responsibilities
- Build and scale backend platform services for the AI gateway, evolving an existing prototype into a reliable, independently scalable service.
- Solve streaming problems, handling SSE/streaming responses across heterogeneous providers, including partial failure recovery, mid-stream fallback, and consistent response normalization.
- Ship reliable platform infrastructure, including authentication, rate limiting, usage metering, and cost tracking.
- Build deep observability by instrumenting the platform with distributed tracing, latency breakdowns, usage tracking, and real-time dashboards.
- Build AI-centered platform capabilities by integrating with the client's evaluation platform and data, and collaborating with research and product teams.
- Contribute to the backend of the company's Leaderboards and Evals products when needed, working across platform and product boundaries.
Requirements
- 5+ years of professional software engineering experience, focused on backend services, distributed systems, or developer-facing platforms.
- Strong Golang experience is required, with experience building and operating meaningful backend systems in production.
- Experience designing reliable APIs, service integrations, or gateway/proxy-style systems.
- For Senior candidates: a track record of owning and delivering important backend functionality end to end.
- For Staff candidates: extensive backend/platform experience, strong technical judgment, and the ability to provide hands-on technical leadership.
- Comfortable working hands-on in a fast-moving environment where the product and infrastructure are still evolving.
- Able to work from the San Francisco office three days per week.
Skills
- Golang
- API design
- Service integrations
- Gateway/proxy systems
- Backend services
- Distributed systems
- Developer-facing platforms
- Observability
- Distributed tracing
- Latency tracking
- Usage tracking
- Real-time dashboards
- AI platform capabilities
- Streaming APIs
- Response normalization
- Resilient distributed systems
- LLM APIs
- Model serving
- AI infrastructure
- Evaluation platforms
- Cloud infrastructure (GCP, AWS, Azure, Kubernetes, Terraform, Postgres, Redis)
- Usage tracking
- Billing/metering
- Authentication
- Developer tooling
Location
- San Francisco
Work Type
- Onsite (three days per week)
- Remote (considered with strong endorsement)
Experience Level
- Senior
- Staff
Salary/Compensations
- $200,000 - $350,000 USD plus equity
Benefits
- Comprehensive health, dental, vision, and additional support programs.
- Opportunity to work on cutting-edge AI with a small, mission-driven team.
- Culture that values transparency, trust, and community impact.
- Visa sponsorship available.
About the Company
- This fast-growing startup is building technology that helps people better understand how AI models perform in real-world settings.
- Its open evaluation platform provides researchers, developers, and organizations with meaningful insights into model quality and performance.
- Through crowdsourced benchmarks and human preference data, the company helps inform important decisions about the development and use of artificial intelligence.
- Its evaluation tools and leaderboards have become trusted resources within the AI community.
- Behind the platform is a team of experienced researchers, engineers, and builders who seek truth, move quickly, and care deeply about craftsmanship and impact.
- They’re building a company where deep expertise meets curiosity and where the work genuinely matters.