Senior Frontend Engineer (Contractor)

Location: Remote (LATAM only)

Engagement: Contractor

Experience: Senior (5+ years)

Timezone: Must overlap with US working hours

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.

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.

• 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

• 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)

• 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

• 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

• 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)

• Pixel-accurate Figma-to-code execution

• Strong understanding of responsive and mobile-first UX

• Experience with performance optimization, code splitting, lazy loading, and profiling

• 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)

• 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

• Strong opinions, loosely held

• Clean, maintainable, well-tested code

• Systematic debugging and ownership of production issues

• Good judgment balancing quality and speed

• 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

• Clear written English communication

• Comfort working async across time zones

• Proactive about blockers and clarifying requirements

• Thoughtful, constructive code reviews and mentorship

• Comfortable with ambiguity and changing priorities

• Move fast without cutting corners

• Willing to wear multiple hats when needed

• Curious, resourceful, and self-directed

• 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

• 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