Firstup

Sr. Software Engineer, Frontend

Apply Now

Job Description

Job Summary

The Sr. Software Engineer (FE) will lead the development of scalable, high-performance frontend architectures. You will drive engineering excellence through modern React patterns, robust testing strategies, and the strategic use of AI-assisted development tools to accelerate delivery without compromising quality. 



Responsibilities
  • Core Engineering: Build scalable frontend applications using modern React patterns and a component-driven architecture.
  • Systems Design: Own the design and implementation of a reusable, accessible component library and documentation.
  • Testing & Quality: Define the frontend testing strategy (Unit, Integration, E2E) including visual regression and user interaction coverage.
  • Performance & Reliability: Optimize client-side performance and ensure production readiness through observability, error monitoring, and rapid incident resolution.
  • AI Integration: Leverage and advocate for AI-assisted tools (e.g., GitHub Copilot, Claude) to accelerate development while maintaining rigorous engineering judgment and accountability for code correctness.
  • Leadership: Drive team-wide best practices, conduct quality code reviews, and mentor engineers to elevate overall engineering quality.
  • Collaboration: Partner with Product and Design to translate requirements into intuitive UI, making informed technical trade-offs in the face of ambiguity.

  • Minimum Qualifications
  • Experience: 5+ years building reliable, high-performance frontend applications at scale.
  • Core Stack: Expertise in React (Hooks, State Management), TypeScript, and modern tooling (Vite, Webpack).
  • Testing: Proficiency with Jest, React Testing Library, and Cypress/Playwright.
  • UI/UX: Proven experience building design systems or component libraries with a focus on WCAG accessibility.
  • AI Literacy: Demonstrated ability to use and critically validate AI-assisted coding outputs (e.g., Claude, Copilot).
  • Education: Bachelor’s in CS or equivalent practical experience.

  • Preferred Qualifications:
  • Fullstack: Experience with Ruby on Rails, Node.js, or AWS/Cloud infrastructure (Docker, Kubernetes).