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Sr. Front-End Engineer

STLabs· Engineering
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NYC, NY$160k - $230kFull-timePosted 3w ago

About the role

Senior Front-End Engineer (AI-First) to own and shape the user-facing product end to end, building polished, high-performance interfaces and AI-driven tooling within a small but growing engineering team.

Responsibilities

  • Own the front-end architecture for core product surfaces, making thoughtful decisions around state management, data fetching, performance, and scalability.
  • Build responsive, accessible, and high-performance UIs using modern front-end technologies (e.g. React, Next.js, TypeScript).
  • Design, develop, and evolve a shared component library / design system, ensuring consistency, usability, and maintainability as the product grows.
  • Collaborate closely with backend engineers to define API contracts (REST / SSE / GraphQL) and ensure smooth, efficient data flow between frontend and backend.
  • Build AI-first, realtime user experiences, including streaming and interactive components that respond dynamically to backend and model outputs.
  • Leverage AI-assisted development tools (code generation, refactoring, testing, linting, review) as a core part of your workflow to increase velocity while maintaining high code quality.
  • Partner deeply with Product and Design to translate UX concepts and wireframes into production-ready features, proactively identifying edge cases, trade-offs, and implementation risks.
  • Drive performance, accessibility, and quality across the front-end stack (load times, responsiveness, cross-browser support, a11y).
  • Set and uphold high engineering standards: write clean, testable code; lead by example in code reviews; help define front-end best practices and patterns.

Qualifications

  • Several years of professional front-end engineering experience (or equivalent), with deep hands-on experience building production applications using modern JavaScript / TypeScript frameworks (e.g. React, Next.js).
  • Strong mastery of HTML, CSS, and modern styling approaches (CSS-in-JS, design tokens, component-based styling), with a deep understanding of browser behavior, layout, and performance.
  • Proven experience owning and evolving complex front-end systems, not just implementing features.
  • Experience integrating with backend APIs (REST / GraphQL / streaming APIs) and collaborating closely with backend teams on system design.
  • Experience building or supporting realtime, streaming, or AI-driven UI components.
  • Strong product and UX instincts - comfortable working with designers and product managers to refine flows, interactions, and edge cases.
  • High standards for code quality and maintainability; experience with testing strategies, CI/CD workflows, and version control (Git).
  • Strong interest in - and comfort with - AI-augmented engineering workflows, using AI tools to accelerate development without sacrificing correctness or quality.

Skills

Required:front-end engineeringHTMLCSS & stylingAPI integrationAI-augmented engineering workflowsreal-time / streaming UIdesign collaboration
Nice to have:performance & accessibility

Benefits

  • Not specified in the description.
Last updated Oct 2, 2026. Interested? Apply on the company site.
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