Staff Frontend Software Engineer, Twelve Labs

• 8+ years building production frontend applications
• Deep experience with React and modern frontend patterns
• Strong experience with Next.js & Tanstack Query
• Strong client-side performance and UX instincts
• Use of component libraries like shadcn & material ui
• Experience building browser-based video and data streaming experiences
• Working knowledge of HTML5 video APIs and streaming concepts
• Comfort working across the stack and making pragmatic tradeoffs
• Candidates must be able to travel up to 10% of the time annually to attend conferences, off-site meetings, and other business-related events as required by the role
• Familiarity with Vercel and frontend-focused CI/CD

Desirable

• We’re hiring a Senior Frontend Engineer to build high-performance, video and data-centric agentic applications
• This is a frontend-first role with end-to-end ownership, requiring strong UX craft, performance instincts, and enough backend fluency to collaborate on APIs, authentication, and real-time data flow
• You’ve built complex, multi-state UIs that feel fast and intentional. You care deeply about polish, usability, and performance, and you’re comfortable collaborating across the stack while spending most of your time in the browser
• This role may require participation in on-site interviews and/or completion of in-person onboarding processes
• Build performant, polished experiences with React and Next.js
• Lead and evolve client-side architecture for interactive, video- and data-streaming products
• Build fluid, asynchronous UIs with strong performance, micro-interactions, and intentional motion
• Translate Figma designs into production-ready interfaces
• Implement and optimize browser-based video and real-time data streaming
• Build UIs that respond to incremental, real-time, or long-running streamed data, not just request/response flows
• Handle large video and data workloads within browser constraints (memory, buffering, network variability)
• Make informed tradeoffs around video formats, codecs, streaming, and transport
• Optimize rendering for complex timelines, lists, and canvases
• Write reliable unit, integration, and E2E tests for complex UI workflows
• Use AI-assisted development tools thoughtfully to accelerate implementation while maintaining correctness, performance, and code quality
• Design and integrate clean, well-scoped APIs to support streaming and async frontend workflows
• Implement and integrate authentication flows (sessions, tokens, role-based access)
• Collaborate with backend engineers on data models, streaming strategies, and performance tradeoffs