Skip to content
SigmaSigma

Senior Software Engineer - Frontend

Develop responsive user experiences and novel data visualizations using React, GraphQL, TypeScript, and Node.js. Own product features from design to launch while collaborating with product and backend teams.

About the job

What You Will Be Doing

  • Develop elegant and responsive user experiences using the latest front-end technologies
  • Own substantial pieces of the product, from design to launch
  • Work with product, UX design, and backend development teams to develop new features and technologies that simplify the user experience for non-technical users
  • Create novel visualizations for structured and unstructured data
  • Develop new techniques for improving the performance and interactivity of the application
  • Use modern frontend frameworks like React, GraphQL, TypeScript and Node.js

Qualifications We Need

  • 5+ years industry experience building and maintaining high-quality software
  • An eye for great design and a passion for building products that provide a great user experience
  • Ability to make the right trade-offs between functionality and delivery speed
  • Desire to be a great teammate with strong ownership
  • Strong sense of craftsmanship and academic curiosity
  • Strong computer science fundamentals

Qualifications We Want

  • Experience building software capabilities for analyzing large scale data web applications
  • Prior experience working at high growth company solving technical problems

Compensation & Benefits

  • Base salary range: $170k - $240k annually
  • Eligible for stock options
  • Comprehensive benefits package including equity, generous health benefits, flexible time off, paid bonding time, 401k, commuter and FSA benefits, lunch program, dog friendly office

Skills

React, GraphQL, TypeScript, Node.js, JavaScript, Frontend Development, Data Visualization, Computer Science Fundamentals, UX Design, Performance Optimization

LangChain

LangChain

San Francisco, CA
Senior Frontend Platform Engineer, Design Systems
$170k+/yrOn-site5+ YOEFrontend Engineering

Build and evolve LangChain’s reusable React component library and the tooling that supports accessible, consistent, high-quality interfaces across its products. The role requires strong React and TypeScript expertise, design-systems experience, and close collaboration with designers.

Atomicmachines

Atomicmachines

Emeryville, CA
Senior UI Engineer
$165k+/yrOn-site5+ YOEFrontend Engineering

Build and maintain complex React and TypeScript interfaces for manufacturing, engineering, and AI/ML workflows. The role requires experience with stateful interaction-heavy applications, data validation, debugging, and cross-functional collaboration in technically complex environments.

Tabs

Tabs

New York, NY

Senior Software Engineer, Frontend
$175k+/yrOn-site5+ YOEFrontend Engineering

The Senior Software Engineer will build and scale frontend platform infrastructure, including a design system and reusable component library, while collaborating with engineering teams to improve developer and user experiences. The role requires 5–8 years of professional engineering experience and strong TypeScript or JavaScript skills.

LangChain

LangChain

San Francisco, CA
Senior Frontend Engineer, AI Observability & Evals Platform
$175k+/yrOn-siteFrontend Engineering

Develops and enhances user-facing features for LangSmith, an AI observability platform using React and TypeScript. Requires extensive frontend experience, build tools proficiency, API integration, and strong collaboration skills in a fast-paced startup.

Sleeper

Sleeper

San Francisco, CA

Senior Web Engineer
$160k+/yrHybrid5+ YOEFrontend Engineering

Build and own scalable, consumer-facing fantasy sports web experiences using React and TypeScript. The role emphasizes responsive interaction design, animation, performance, reusable components, and API integration, requiring 5+ years of web development experience.