Senior II Frontend Engineer - Engine

You'll take ownership of quality by leading design reviews, code reviews, test strategy, and production readiness. You'll partner closely with product, design, and fellow engineers to shape solutions, clarify tradeoffs, and deliver reliably. You'll architect full-stack, frontend-leaning systems that are small, composable, and resilient to changing requirements. You'll use AI assistants and agents as force multipliers for prototyping, scaffolding, refactoring, and exploratory development, then harden and rigorously validate the results. You'll champion functional programming principles and immutability to keep systems simple to reason through and debug. You'll build and maintain a strong automated test suite spanning unit, integration/contract, component/UI, and end-to-end coverage with fast CI feedback loops.

Responsibilities

• Uphold a high bar for quality through design reviews, code reviews, test strategy, and production readiness
• Partner with product, design, and fellow engineers to shape solutions and clarify tradeoffs
• Design and build full-stack, frontend-leaning systems that are small, composable, and resilient to change
• Enforce architectural and operational quality, catching subtle issues in fast-moving AI-assisted development
• Champion functional programming principles and immutability
• Use AI assistants and agents for prototyping, scaffolding, refactoring, and exploratory development, then harden and validate results
• Build and maintain a strong automated test suite with unit, integration/contract, component/UI, and end-to-end coverage

Requirements

• Bachelor's degree in Computer Science, Engineering, or a related field
• 8+ years of experience building production web applications and 1+ years as a principal engineer
• Expert-level proficiency with TypeScript, strong experience with React, server-side rendered Next.js (or similar), and performant component-driven development (e.g. Reshaped UI)
• Ability to articulate complex technical trade-offs to stakeholders and translate product vision into high-fidelity technical direction
• Demonstrated development of simple, reusable, changeable systems (with examples of refactors, platforming work, or scalable patterns)
• Preference for functional programming and a deep understanding of why immutability is critical in modern frontend development
• Advanced knowledge of the testing pyramid and how to use automated tests as a safety net for rapid, iterative development
• Proven technical leadership through mentorship, delegation, and high-quality code reviews
• Hands-on experience with tools like Cursor (or equivalent AI-augmented IDEs) and all modern coding models
• Practical understanding of where AI is strong vs. where it falls short
• Ability to use AI agents to quickly project multiple approaches, compare tradeoffs, and converge on the best solution