Senior Software Engineer, Frontend

LMArena is seeking an experienced Senior Frontend Product Engineer to lead the design and development of intuitive, AI-focused user experiences across their platform. The ideal candidate combines strong frontend craft with backend thinking and is excited to shape how people interact with cutting-edge AI models.

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

Benefits

• Competitive salary
• Meaningful equity
• Comprehensive healthcare coverage (medical, dental, vision)
• The opportunity to work on cutting-edge AI with a small, mission-driven team
• A culture that values transparency, trust, and community impact