LMArena

Senior Software Engineer, Frontend

LMArena

full-time

Posted on:

Location Type: Hybrid

Location: Bay Area • California • United States

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Job Level

Senior

Tech Stack

JavaScriptNext.jsPostgresReact

About the role

  • Lead development of UI and application logic for our chat interface using React and Next.js
  • Craft intuitive, accessible, and responsive user experiences that feel delightful across devices
  • Collaborate closely with design to maintain and extend a cohesive visual language and component system
  • Implement A11y accessibility standards and internationalization (i18n) support for a global audience
  • Expand backend data structures and business logic to support new frontend features
  • Plan and integrate analytics to measure user engagement, adoption, and product performance
  • Visualize feature performance and usage metrics through dashboards and internal tooling
  • Own the full feature lifecycle—from technical scoping to deployment and iteration based on insights

Requirements

  • 5+ years of experience in software engineering, with a focus on full-stack or frontend product development
  • Deep experience building accessible, responsive React/Next.js interfaces in production
  • Strong CSS fundamentals and familiarity with utility-first frameworks like Tailwind
  • Experience working with modern component systems such as ShadCN or similar design systems
  • Comfortable building and integrating backend APIs (bonus if you've worked with HonoJS or lightweight frameworks)
  • Proficient with relational databases such as Postgres, and how to extend schemas to support new features
  • Familiarity with testing practices and tools like Vitest (or similar testing frameworks)
  • Experience integrating analytics tools and using product metrics to guide iteration
  • Clear communicator and strong collaborator across design, product, and engineering teams
  • Bonus: Experience building real-time or AI-driven UIs, or shipping features for technical audiences
Benefits
  • Competitive compensation and equity aligned to the markets where our team members are based.
  • Comprehensive health and wellness benefits, including medical, dental, vision, and additional support programs.
  • The opportunity to work on cutting-edge AI with a small, mission-driven team
  • A culture that values transparency, trust, and community impact

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
ReactNext.jsCSSTailwindA11yi18nbackend APIsPostgresVitestreal-time UIs
Soft skills
clear communicatorstrong collaborator