Braintrust

Software Engineer, Product

San Francisco · New York City · Seattle

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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

Derived automatically from the posting. Upload your resume above to see how the role scores against it.

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.

Original posting on Braintrust's site ↗

Listed on hirly, a job board. hirly is not the employer: Braintrust is hiring for this role.

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