Mission.dev

Mission.dev is a platform designed to support the success and growth of senior-level software engineers and the companies that collaborate with them. It operates a talent marketplace that combines AI-powered vetting, real technical assessments, and expert human evaluation to streamline hiring for software development teams. The platform offers products like Mission Match for smarter, faster hiring, Mission Signal for real-time insights, and Mission Network for access to top-tier global talent. Mission.dev differentiates itself by providing a rigorous vetting process, a global network of over 30,000 vetted members from 50+ countries, and a comprehensive hiring lifecycle management including onboarding, compliance, and payments. Its business model includes subscription and transaction fees with flexible pricing plans for direct hires and contractors. The company emphasizes community, mentorship, and continuous learning for its members, aiming to combine the productivity of in-house work with the flexibility of remote teams. Key clients include Eli Health, Alayacare, and HatchPath, who praise Mission.dev for its quality talent and collaborative approach.

AI-poweredCommunityGlobal NetworkHiring PlatformRemote WorkSoftware EngineeringTalent MarketplaceTechnical Vettingmission.dev

Mission.dev

AI-poweredCommunityGlobal NetworkHiring PlatformRemote WorkSoftware EngineeringTalent MarketplaceTechnical Vettingmission.dev

HQMontréal, CA

Team Size61

Open Jobs65

Total Funding-

Latest Fundraise6 years ago

Join the Team

Senior Frontend Software Engineer | AI Developer Tooling (React/TS) – Palo Alto Onsite

On-SiteCalifornia, US

On-Site • California, US

Agreement type : This is an on-site full-time employment role, with direct hiring by the client.

On-site role based in Palo Alto, California

Relocation/visa support.

Our company description

Mission is a platform for hiring, vetting, and managing software development talent.

It enables our clients to connect with the world’s best talent to build mission-critical software products.

About the client

Our client is a cutting-edge technology company focused on developing the next generation of enterprise intelligence systems.

Their teams are building AI-driven infrastructure that powers advanced automation and decision-making at scale.

The work involves designing and deploying highly reliable distributed systems, as well as leveraging large language models and agent-based workflows to create production-ready solutions.

They foster a culture of deep technical excellence, ownership, and fast-paced execution.

Engineers are encouraged to apply strong fundamentals while using modern tooling and AI-assisted development to deliver complex systems with precision and reliability.

This is an onsite, high-commitment environment ideal for engineers eager to tackle technically demanding challenges with significant real-world impact and growth potential.

About the role

Our client is looking for a Senior Frontend Software Engineer to own and evolve the user interfaces for AI-driven developer and audit tooling.

This role focuses on building high-performance, real-time web applications that surface agent behavior, streaming model outputs, system evaluations, and human review workflows.

You will operate at the boundary between advanced backend AI systems and end users, translating complex, dynamic behavior into interfaces that are fast, clear, and intuitive.

This is a hands-on senior IC role with meaningful ownership over frontend architecture and user experience.

What You’ll Do

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:

What You Bring

5–8+ years of professional frontend engineering experience

Preferred Experience

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

Work Environment & Expectations

On-site role based in Palo Alto, California
High-intensity, execution-focused engineering culture
Strong emphasis on ownership, accountability, and production reliability
Opportunity to work on foundational AI systems with significant technical depth
Competitive compensation, healthcare coverage, equity participation, and relocation / visa support

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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

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