Backend Engineer

Braintrust is building the modern platform for evaluating and deploying AI systems. Our mission is to help enterprises build trust in their AI by making it easy to test, monitor, and improve models using real-world evaluation frameworks. We work with cutting-edge customers in finance, healthcare, and tech who are building production-grade AI systems.

We’re looking for a backend engineer who’s excited to build the infrastructure behind cutting-edge AI development tools.

Under the hood, Braintrust is a real-time, high-availability data platform that operates in both SaaS and self-hosted environments. You’ll help scale our ingestion pipelines, evolve our open source libraries, and ensure everything runs reliably, observably, and fast. If you thrive in a fast-paced environment and enjoy solving hard systems problems with a product mindset, we’d love to work with you.

As a backend engineer at Braintrust, you’ll help build the core platform powering LLM-native development:

• Design and ship features that give users deep insight into their LLM usage and performance.

• Integrate, proxy, cache, and collect data from OpenAI, Anthropic, Gemini, and other major model providers that our customers rely on.

• Develop and evolve robust, efficient open source libraries for tracing and evaluating LLM calls inside customer applications.

• Build highly available real-time data pipelines to ingest, store, and query large volumes of structured and semi-structured AI usage data.

• Own and operate backend systems designed to run reliably in both our SaaS and customer-managed environments.

• Collaborate closely with frontend and product engineers to ship polished, end-to-end features that solve real problems for our customers.

• Improve our observability, operability, and internal tooling to help us move fast without breaking things.

• 5+ years of backend engineering experience across multiple parts of the stack

• Strong systems thinking: you’ve owned or contributed to infrastructure projects and know how to design for scale, uptime, and data integrity

• Proficient in modern backend technologies (e.g., Node.js, Go, Python, Rust, Postgres, Redis, Terraform, Docker, AWS)

• Experience with observability tooling (e.g., Grafana, Prometheus, Datadog, or similar) and a passion for making systems operable, available and rock solid.  

• Comfortable with ambiguous problems and excited to partner across the company to ship impactful work

• Clear communicator who documents decisions, shares context, and helps lift the team

• Medical, dental, and vision insurance

• 401k plan

• Daily lunch, snacks, and beverages

• Flexible time off

• Competitive salary and equity

• AI Stipend

Braintrust is an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status.