Mission.dev · 1 day ago
Senior Frontend Software Engineer
California, United States
Full-time
Onsite
Senior Level
$180K/yr - $220K/yr
5+ years expMission.dev is a platform for hiring, vetting, and managing software development talent. They are seeking a Senior Frontend Software Engineer to own and evolve user interfaces for AI-driven developer and audit tooling, focusing on building high-performance, real-time web applications.
Developer PlatformSaaSSoftwareSoftware EngineeringWeb Development
Hiring Manager
Gabriela A Chitarrini
Responsibilities
Design and build complex frontend applications using TypeScript and React
Own frontend architecture decisions, including routing, state management, caching, and rendering strategies
Implement real-time UI patterns for AI systems, including:
Streaming model outputs /Agent actions and tool execution traces /Live system feedback and updates
Build and maintain reusable component systems and design tokens
Enforce accessibility, responsiveness, and cross-browser reliability
Develop rich interfaces for data review, annotation, and human-in-the-loop audit workflows
Build advanced editors, tables, and visualizations for technical users
Instrument analytics, monitoring, and experiments to measure UX quality and performance
Set and maintain performance budgets; identify and resolve regressions
Partner closely with product, design, and backend teams to turn research and prototypes into production-ready experiences
Qualification
Required
5–8+ years of professional frontend engineering experience
Strong, production-level expertise with TypeScript and React (Next.js, Vite, or similar)
Experience building and operating large, complex frontend applications
Recent hands-on experience with AI-enabled or agent-based systems, ideally in B2B environments
Comfort integrating with streaming or asynchronous backends and real-time data flows
Deep understanding of frontend performance, reliability, and maintainability, including: Performance profiling and optimization / Bundle sizing, code splitting, and rendering strategies / Hydration, virtualization, and client/server rendering tradeoffs
Proven experience shipping real-time user interfaces connected to AI or streaming systems
Strong testing discipline, including automated testing (e.g., Playwright, Jest)
Ability to remain hands-on while contributing to technical direction and mentoring others
Strong collaboration skills across design, product, and backend teams
Experience working across both startup environments and larger engineering organizations
Preferred
Ownership of frontend architecture or design systems at a SaaS or developer-focused company
Familiarity with modern API and data transport patterns (e.g., GraphQL, typed RPCs)
Experience with advanced browser capabilities (e.g., web workers, WASM)
Exposure to collaborative or state-synchronization systems
Data visualization experience for technical or analytical users
Strong fundamentals in frontend security and accessibility
Experience with monitoring, observability, and experimentation tooling
Benefits
Competitive compensation
Healthcare coverage
Equity participation
Relocation / visa support
Company
Mission.dev
Mission.dev is the next-gen staffing platform for software talent.
51-200 employees
H1B Sponsorship
Mission.dev has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2023 (1)
2021 (4)
Funding
Current Stage
Growth StageTotal Funding
unknown2020-01-01Seed
Leadership Team
Fred Brunel
CTO & Co-Founder
Recent News
2025-08-05
Company data provided by crunchbase