Senior Front-End Software Engineer (Hybrid NYC ) - 1094

Braintrust; New York (NY); On-site; USD 120,000 - 180,000; Full time

Job summary

Braintrust is seeking an experienced frontend engineer to build and maintain AI-assisted prototyping tools that accelerate moving from ideas to high-fidelity prototypes aligned with the Design System.

You will lead new feature development, contribute to documentation, perform code reviews, and provide technical guidance to peers, leveraging expertise in JavaScript, TypeScript, React, and CSS.

Qualifications

• Strong expertise in JavaScript, TypeScript, React, and CSS.
• Experience building AI-powered developer tools.
• Ability to write evaluations to measure AI quality.

Responsibilities

• Build and maintain AI-assisted prototyping tools.
• Lead new feature development.
• Support peers through documentation, code reviews, and technical guidance.

Skills

JavaScript

TypeScript

React

CSS

Generative AI Tooling

Frontend Component Design

AI Evals

Web Components

Web Accessibility

WAI-ARIA

WCAG

Technical Documentation

Code Review

Prototyping Tools

Design Systems

Tools

Code Review

Prototyping Tools

Design Systems

Web Accessibility tooling

Job description

Build and maintain AI-assisted prototyping tools to accelerate the transition from ideas to high-fidelity prototypes aligned with the Design System. Lead new feature development and support peers through documentation, code reviews, and technical guidance.

Requirements:

Requires strong expertise in JavaScript, TypeScript, React, and CSS, with a proven track record of creating reusable frontend components. Candidates must have experience building AI-powered developer tools and writing evaluations to measure AI quality.

Key Skills:

JavaScript, TypeScript, React, CSS, Generative AI Tooling, Frontend Component Design, AI Evals, Web Components, Web Accessibility, WAI-ARIA, WCAG, Technical Documentation, Code Review, Prototyping Tools, Design Systems