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Software Engineer, Product

Braintrust 路 San Francisco; New York City; Seattle

Extracted from the posting

Base
Not stated
Remote
On-site
Stack
TypeScript, React, Next.js, SQL

Build user-facing features of Braintrust's observability product, including a prompt playground, prompt management with versioned comparisons, a multiplayer human review system, and LLM output analysis. The frontend is modern TypeScript and React with a visualization-heavy UI. Requires expert TypeScript, React, HTML, CSS, SQL, and NextJS skills.

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.

Technologies

TypeScriptReactNext.jsSQLHTMLCSS
Braintrust
Braintrust
Website

Job details

TypeFull-time
Work ModeOn-site
LevelMid Level
Location馃嚭馃嚫San Francisco, CA馃嚭馃嚫New York, NY馃嚭馃嚫Seattle, WA
PostedNov 05, 2026
Apply Now

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