Senior Frontend Engineer (Contractor)

SENIOR FRONTEND ENGINEER (CONTRACTOR) Location: Remote (LATAM only) Engagement: Contractor Experience: Senior (5+ years) Timezone: Must overlap with US working hours ROLE SUMMARY We are hiring a Senior Frontend Engineer (Contractor) to be a core individual contributor on our web application. This is a hands-on role (80%+ coding) focused on building high-quality, production-grade user interfaces used daily by haulers and operators in the field. You will work closely with Product, Design, and Backend Engineering to ship features quickly while maintaining a high bar for quality, performance, and usability. This role requires strong ownership, clear communication, and the ability to operate independently in a remote environment. AI-FIRST ENGINEERING We are intentionally building an AI-assisted engineering organization. AI tools are part of the daily workflow, not optional. What this means in practice: - Daily use of tools such as Claude, Claude Code, Cursor, and GitHub Copilot - AI-assisted implementation, refactoring, test generation, and boilerplate - You focus on architecture, UX decisions, edge cases, and quality - You review all AI-generated output with a trust-but-verify mindset This role is not a fit for engineers who are resistant to AI-assisted development or who rely on AI output without understanding the code being produced. KEY RESPONSIBILITIES BUILD & SHIP - Implement pixel-accurate, responsive interfaces from Figma using React, TypeScript, and Material-UI (MUI) - Own features end-to-end from design handoff through implementation, testing, deployment, and iteration - Build complex, validated forms using React Hook Form - Ensure mobile-first UX, including tablet-first workflows used in the field QUALITY & CRAFT - Own frontend testing across unit, integration, and e2e layers (Jest, React Testing Library, Cypress or Playwright) - Drive frontend quality standards and best practices - Optimize performance including bundle size, render performance, and Core Web Vitals - Extend and customize MUI components using advanced CSS (Flexbox, Grid, CSS variables) COLLABORATE & ITERATE - Work closely with Product, Design, and Backend Engineering - Participate in code reviews and mentor junior engineers - Ship MVPs quickly and iterate based on customer feedback - Communicate clearly in an async-first environment using Slack, Notion, and Loom SHAPE THE PLATFORM - Help define component patterns and frontend architecture - Influence and support the transition from JavaScript to TypeScript - Contribute to the evolution of the design system - Identify and address technical debt pragmatically REQUIRED QUALIFICATIONS CORE STACK - 5+ years building production React applications - Strong TypeScript experience or full readiness to adopt it - Deep experience with Material-UI (v5+) - Expert-level use of Redux Toolkit and RTK Query - Advanced CSS3 including Flexbox, Grid, responsive design, and mobile-first principles - Experience building complex forms with React Hook Form - Hands-on ownership of frontend testing (Jest, RTL, Cypress or Playwright) DESIGN & EXECUTION - Pixel-accurate Figma-to-code execution - Strong understanding of responsive and mobile-first UX - Experience with performance optimization, code splitting, lazy loading, and profiling WORKFLOW - Experience working in Agile or Scrum environments - Comfortable with PR-based Git workflows and code reviews - Familiarity with Jira, Slack, Figma, and modern frontend build tools (Vite or Webpack) NICE TO HAVE - Firebase (Auth or Storage) - Mapping libraries (Leaflet, Mapbox, Google Maps) - GraphQL or REST API integration - Monorepo or micro-frontend experience - B2B SaaS or field-service software experience WHAT WE LOOK FOR TECHNICAL EXCELLENCE - Strong opinions, loosely held - Clean, maintainable, well-tested code - Systematic debugging and ownership of production issues - Good judgment balancing quality and speed OWNERSHIP MINDSET - Ownership of the full feature lifecycle - Proactive problem identification and solutioning - Attention to edge cases, error states, and accessibility - Follow-through until features are stable and shipped COMMUNICATION & COLLABORATION - Clear written English communication - Comfort working async across time zones - Proactive about blockers and clarifying requirements - Thoughtful, constructive code reviews and mentorship STARTUP MINDSET - Comfortable with ambiguity and changing priorities - Move fast without cutting corners - Willing to wear multiple hats when needed - Curious, resourceful, and self-directed WHAT SUCCESS LOOKS LIKE - High-quality UI features shipped consistently - Clean, scalable frontend architecture - Strong test coverage and predictable releases - Minimal rework due to UX or quality issues - Strong trust from Product and Design partners CONTRACTOR & LOCATION NOTES - This is a contractor role, not full-time employment - Candidates must be based in LATAM - Senior-level ownership and reliability are expected - Consistent overlap with US working hours is required