Software Engineer, Full Stack

Arena
San Francisco
Workplace: HybridFull timeFunction: Software EngineeringExperience: 3+ yearsSkills: ["Communication","Collaboration","Ownership","Iteration","Product mindset"]

Own full-stack features end-to-end across Arena’s platform, from scoping and designing solutions to deployment, monitoring, and post-launch iteration. Build and extend schemas, APIs, and business logic, ship high-quality product code across the stack, and improve outcomes using real user feedback and data. Partner with ML researchers to turn research services into production-ready capabilities, and collaborate with design and product to define what to build.

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FursaFursa
Arena
Arena
2 days ago

Software Engineer, Full Stack

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Source: Company careers pageValidated by: Fursa AI
Last checked: 4 hours agoStatus: Live

Job Summary

Own full-stack features end-to-end across Arena’s platform, from scoping and designing solutions to deployment, monitoring, and post-launch iteration. Build and extend schemas, APIs, and business logic, ship high-quality product code across the stack, and improve outcomes using real user feedback and data. Partner with ML researchers to turn research services into production-ready capabilities, and collaborate with design and product to define what to build.
Location: San Francisco
Workplace: Hybrid
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Own features end-to-end from technical scoping through deployment and post-launch iteration.
  • •Design and extend schemas, APIs, and business logic to support new product capabilities.
  • •Ship high-quality product code across the full stack.
  • •Use real user feedback (data, direct contact, and product instincts) to improve what’s shipped.
  • •Collaborate with ML researchers and product/design/engineering to turn research services into production and decide what to build.

Pay and Benefits

Equity and Bonus:Equity
Perks:MedicalDentalVision

Key Requirements

  • •3+ years of software engineering experience with a focus on enterprise or developer-facing product development.
  • •Experience building user-facing web applications across frontend, backend/API, and database, understanding the request lifecycle across layers.
  • •Clear, concise communication to explain technical decisions and share context proactively.
  • •Evidence of shipping and iterating features you owned end-to-end, including post-launch outcomes and what you’d change next.
  • •A product engineering mindset focused on whether the built work works for users, plus genuine curiosity about AI evaluation and Arena’s mission.
Experience:3+ yearsEnterprise softwareDeveloper toolsAIMachine learning
Skills:CommunicationCollaborationOwnershipIterationProduct mindset
Tech Stack:NextJSReactTypeScriptTailwindShadCNHonoJSPostgresVitestSupabaseVercel AI SDKAPIsSchemasBusiness logic

Company Brief

Arena
LMArena operates a community-driven platform for evaluating and benchmarking large language models via crowdsourced pairwise comparisons and leaderboards, used by researchers and AI labs to measure real-world model performance. ([linkedin.com](https://www.linkedin.com/company/lmarena?utm_source=openai))
Industry: Developer Tools
Company Size: Small (11 to 50 employees)
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series A
Headquarters: San Francisco, United States
Founded: 2025
WebsiteLinkedIn