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Senior Frontend Engineer

Job in San Mateo, San Mateo County, California, 94409, USA
Listing for: Sinclair Talent Solutions
Full Time position
Listed on 2026-02-05
Job specializations:
  • Software Development
    Full Stack Developer, Software Engineer
Job Description & How to Apply Below

This is a confidential search for a key engineering role with a high-growth, Series A startup in the AI space. The company is building a transformative B2B SaaS platform that leverages AI to solve complex problems y are backed by top-tier venture capital firms (including names like Index Ventures and Signal Fire) and are experiencing significant revenue growth. You will be joining as a foundational engineer to build the core product that defines a new category.

Job Summary

We are looking for a Senior Frontend Engineer to own the development of the customer-facing application. This is a foundational, hands-on coding role (IC) where you will directly translate complex AI capabilities into intuitive, powerful, and polished user experiences. You will collaborate with a talented team of AI/ML and full-stack engineers to ship features that customers rely on daily.

Responsibilities & Duties
  • Lead the design and implementation of new user interfaces and features using React, Next.js, Type Script, and Tailwind CSS.
  • Build reusable component libraries and frontend architecture that ensure consistency, performance, and developer velocity.
  • Work closely with backend engineers to design and integrate with Graph

    QL/REST APIs.
  • Optimize applications for maximum speed, scalability, and a flawless user experience.
  • Actively participate in code reviews, mentor peers, and contribute to engineering culture.
  • Leverage AI-assisted development tools (e.g., Cursor, Copilot, Claude) as a core part of your workflow to build smarter and faster.
Requirements
  • Seniority: 3+ years of professional frontend engineering experience.
Work Experience
  • IC Role: Must be hands-on coding, not pure architecture. We need builders who ship.
  • Startup

    Experience:

    At least 1 year of experience in a Series A/B/C/D stage startup. You understand rapid iteration and owning outcomes.
  • Big Tech + Startup: A blend of experience at a scaled tech company and a startup is highly valued. You bring engineering rigor and startup pace.
  • Education: Bachelor’s degree in Computer Science or a related STEM field.
Hard Skills
  • Deep, production-level expertise with React, Next.js, Type Script, and Tailwind CSS
    .
  • A strong portfolio of building and shipping complex, data-rich web applications.
  • Must be open to and actively using AI coding tools (Cursor, Claude, Git Hub Copilot, etc.) in your daily development process.
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Position Requirements
10+ Years work experience
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