Braintrust
Software Engineer, Product
San Francisco
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hirly's read of this role
- Role family
- Engineering
- Seniority
- Mid level
- Country
- US
- Work mode
- On-site / unstated
- First seen by hirly
- 4 Sept 2026
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the posting
About the company
Braintrust is the agent observability platform. By actively applying intelligence to agent traces and automatically surfacing the most critical patterns, Braintrust gives teams the visibility to understand how agents behave in production and the tools to improve them.
Teams at Notion, Stripe, Box, OpenAI, and Cloudflare use Braintrust to trace their agents, find the issues in their observability data, and run evals that tell them how to improve.
About the role
We're looking for a product engineer who is passionate about building tools that users love and use every day. You'll work on the core product, hang out with users (developers, product managers, and designers working in AI), and play a key role in shaping the roadmap.
Under the hood, Braintrust is a high performance, local-first, visualization-heavy UI built with modern Typescript and React. Our users work at some of the world's best technology companies and expect our product to be lightning fast, reliable, and intuitive.
What you'll do
Core responsibilities:
Ensuring our customers always have a frictionless experience for enabling AI observability in their systems.
Contribute to foundation UI architecture that focuses on performance and efficient data loading patterns.
Build the user-facing pieces of Braintrust, such as:
A first-class prompt playground experience supporting multiple models across thousands of user inputs.
A system for prompt management, configuration, and versioned comparisons.
A fully multiplayer, scalable human review system.
LLM output analysis and comparison across arbitrarily large datasets.
Ideal candidate credentials
Expert-level understanding of Typescript, React, HTML, CSS, SQL, NextJS
Previous experience founding or working at startups is a plus
Has written prompts / tinkered with GPT models and apps
Benefits include
Medical, dental, and vision insurance
Daily lunch, snacks, and beverages
Flexible time off
Competitive salary and equity
Wifi & cellphone 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.
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