Open Source Engineer - Go

Braintrust; San Francisco (CA); On-site; USD 180,000 - 250,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

Daily lunch, snacks, and beverages

Flexible time off

Competitive salary and equity

AI Stipend

Job summary

Braintrust is hiring engineers to build open-source SDKs that observe, understand, and optimize how AI operates in production. You will own the full SDK lifecycle across Go libraries, from design and implementation to release, docs, and community support.

This role suits developers who care about developer experience, API craftsmanship, and reliable, idiomatic Go. You’ll collaborate with backend, platform, and product teams and engage with our community to drive adoption and quality.

Qualifications

• Deep expertise in Go and building fast, idiomatic libraries.
• Experience with open-source projects and community engagement.
• Strong API design and tooling skills.
• Familiarity with testing, profiling, CI/CD pipelines, and packaging.

Responsibilities

• Build elegant, idiomatic Go SDKs powering Braintrust’s evaluation and observability.
• Ensure libraries are easy to use, efficient, and well-documented.
• Integrate with major AI providers and frameworks used by customers.
• Create tools to improve testing, profiling, and release workflows.
• Collaborate with backend, platform, and product teams for a cohesive experience.
• Engage with the user community, address issues, and foster adoption.

Skills

Go language

Developer experience

Open source

API design

CI/CD

Testing frameworks

Profilers

Tools

OpenTelemetry

Go tooling

Job description

About the company

Braintrust is the AI observability platform. By connecting evals and observability in one workflow, Braintrust gives builders the visibility to understand how AI behaves in production and the tools to improve it.

Teams at Notion, Stripe, Zapier, Vercel, and Ramp use Braintrust to compare models, test prompts, and catch regressions — turning production data into better AI with every release.

About the Role

We’re hiring engineers to build the open-source libraries that customers use to observe, understand, and optimize how AI operates inside their production applications. These SDKs are a critical part of Braintrust’s platform. They power evaluation and observability pipelines across a wide range of environments, frameworks, and AI providers.

This role is ideal for engineers who are passionate about developer experience, API craftsmanship, and building fast, reliable, and idiomatic libraries. You’ll own the full SDK lifecycle: design, implementation, release, documentation, and community support. Your work will be embedded in thousands of applications and help define how AI is adopted and operationalized across industries.

What You’ll Do

• Build elegant, idiomatic, and resilient SDKs that power Braintrust’s LLM evaluation and AI observability platform.

• Ensure our libraries are easy to use, efficient to run, and a delight to work with, prioritizing developer experience and performance.

• Integrate with major AI providers, frameworks, and platforms our customers rely on, such as OpenAI, Anthropic, and Gemini.

• Build tools and automation to improve testing, profiling and simplify release workflows.

• Collaborate closely with backend, platform, and product teams to ensure a cohesive and polished developer experience.

• Be a great community ambassador: talk with our users, understand their issues, help them get their fixes merged and have deep empathy for our users.

You Might Be a Fit If You:

• Are customer-obsessed and passionate about solving real-world problems for developers.

• Have deep expertise in Go and understand what it takes to build fast, idiomatic, and reliable libraries in that ecosystem.

• Are proficient with the tooling needed to build robust SDKs, such as testing frameworks, profilers, CI/CD pipelines, and packaging systems.

• Care deeply about developer experience, from clean APIs and clear docs to thoughtful error handling and backward compatibility.

• Know how to wrap, patch, or extend existing frameworks and SDKs to inject observability and control without breaking developer workflows.

• Have experience maintaining or contributing to production-grade open-source libraries, ideally used across multiple environments.

• Bonus: You’ve contributed to popular open source projects, led SDK adoption at your organization, are familiar with tracing and observability tools like OpenTelemetry, or worked on tools in the LLM/AI ecosystem.

Benefits include

• Medical, dental, and vision insurance

• Daily lunch, snacks, and beverages

• Flexible time off

• Competitive salary and equity

• AI Stipend

Equal opportunity

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.