Job Title: Staff Frontend Software Engineer

Company Name: Twelve Labs

Job Details: $198k-$210k/yrRemoteFull,Time

Job Url: https://hiring.cafe/viewjob/sybnxto8lnvzkc0u

Job Description: Posted 3w agoStaff Frontend Software Engineer@ Twelve LabsView All JobsWebsiteLos Angeles, California, United States$198k-$210k/yrRemoteFull TimeResponsibilities:Build polished UIs, Lead client-side architecture, Implement video streamingRequirements Summary:8+ years frontend experience with React and Next.js; strong UX, performance, and real-time data streaming experience.Technical Tools Mentioned:React, Next.js, Tanstack Query, HTML5 video APIs, Docker, Vercel
Who we areAt Twelve Labs, we are pioneering the development of cutting-edge multimodal foundation models that have the ability to comprehend videos just like humans do. Our models have redefined the standards in video-language modeling, empowering us with more intuitive and far-reaching capabilities, and fundamentally transforming the way we interact with and analyze various forms of media.With a remarkable $107 million in Seed and Series A funding, our company is backed by top-tier venture capital firms such as NVIDIA’s NVentures, NEA, Radical Ventures, and Index Ventures, and prominent AI visionaries and founders such as Fei-Fei Li, Silvio Savarese, Alexandr Wang and more. Headquartered in San Francisco, with an influential APAC presence in Seoul, our global footprint underscores our commitment to driving worldwide innovation.We are a global company that values the uniqueness of each person’s journey. It is the differences in our cultural, educational, and life experiences that allow us to constantly challenge the status quo. We are looking for individuals who are motivated by our mission and eager to make an impact as we push the bounds of technology to transform the world. Join us as we revolutionize video understanding and multimodal AI.About the RoleWe’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.In this role, you willFrontend (Primary)Build performant, polished experiences with React and Next.jsLead and evolve client-side architecture for interactive, video- and data-streaming productsBuild fluid, asynchronous UIs with strong performance, micro-interactions, and intentional motionTranslate Figma designs into production-ready interfacesImplement and optimize browser-based video and real-time data streamingBuild UIs that respond to incremental, real-time, or long-running streamed data, not just request/response flowsHandle large video and data workloads within browser constraints (memory, buffering, network variability)Make informed tradeoffs around video formats, codecs, streaming, and transportOptimize rendering for complex timelines, lists, and canvasesWrite reliable unit, integration, and E2E tests for complex UI workflowsUse AI-assisted development tools thoughtfully to accelerate implementation while maintaining correctness, performance, and code qualityBackend (Supporting)Design and integrate clean, well-scoped APIs to support streaming and async frontend workflowsImplement and integrate authentication flows (sessions, tokens, role-based access)Collaborate with backend engineers on data models, streaming strategies, and performance tradeoffsYou may be a good fit if you have8+ years building production frontend applicationsDeep experience with React and modern frontend patternsStrong experience with Next.js & Tanstack QueryStrong client-side performance and UX instinctsUse of component libraries like shadcn & material uiExperience building browser-based video and data streaming experiencesWorking knowledge of HTML5 video APIs and streaming conceptsComfort working across the stack and making pragmatic tradeoffsCandidates 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.Preferred QualificationsExperience with editors or timeline-based interfacesOptimizing large or real-time datasets in the browserFamiliarity with Vercel and frontend-focused CI/CDComfort using Docker for local developmentExperience with AI- or ML-powered product featuresBenefits and Perks🤝 An open and inclusive culture and work environment.🚀 Work closely with a collaborative, mission-driven team on cutting-edge AI technology.🏥 Full health, dental, and vision benefits✈️ Extremely flexible PTO and parental leave policy. Office closed the week of Christmas and New Years.🛂 VISA support where applicable