Finix
Finix8mo ago
USD 160000–235000/yr

Senior Frontend Engineer

United StatesUnited States·San Francisco,San FranciscoFull-timesenior
EngineeringOtherFrontend EngineeringSenior Frontend Engineer
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Quick Summary

Overview

About Us Finix is building the global operating system for fintech, starting with payments. From startups to publicly traded companies,

Technical Tools
awsdockerexpressjavajavascriptkubernetesreacttypescriptcustomer-successdistributed-systemsecommercefintechmentoringrest-apissaas
About Us

Finix is building the global operating system for fintech, starting with payments. From startups to publicly traded companies, Finix processes tens of billions of dollars annually both in-store and online. Finix was founded in 2015 and is headquartered in San Francisco.

To date Finix has raised over $200M, including a $75M Series C led by Acrew Capital and Lightspeed Venture Partners and backed by American Express Ventures, Bain Capital Ventures, Homebrew, Inspired Capital, Visa, and others


As a Senior Frontend Engineer on our Frontend Engineering Team, you'll architect and build the core payment experiences that power thousands of businesses. You'll develop our comprehensive payments management dashboards and embeddable components that merchants integrate directly into their applications.
 
In this role, you'll drive the technical vision for customer-facing products from conception to production. You'll lead design and implementation decisions while ensuring our payment interfaces remain performant, secure, and intuitive as we scale. Our engineering team operates with high autonomy and ownership—each engineer makes meaningful contributions that directly impact customer success in our dynamic fintech environment.
 
Finix is looking for engineers who bring exceptional technical acumen, attention to detail, passion for growth, and an obsession with delivering an exceptional customer experience.
 
  • Build and maintain sophisticated payment dashboards and transaction management interfaces
  • Build performant, accessible, and reusable component libraries that scale across multiple products
  • Lead technical design sessions and drive frontend architecture decisions
  • Optimize application performance for high-volume financial data processing
  • Collaborate with Product, UX, and Engineering teams to translate complex payment workflows into intuitive user experiences
  • Mentor engineers and establish frontend development standards and best practices
  • Experienced in balancing rapid feature delivery with code quality, testing, and maintainability
  • Skilled at translating business requirements into scalable technical solutions
  • Proactive in monitoring live systems and troubleshooting production issues
  • Comfortable working with ambiguous requirements and driving clarity through technical discovery
  • Committed to knowledge sharing and building team capabilities through documentation and mentorship
  • 6+ years of production experience with modern web technologies (HTML, CSS/SCSS, JavaScript/TypeScript)
  • 3+ years of hands-on React development in complex, data-heavy applications
  • Solid experience with state management solutions (Redux, Zustand, Recoil, or similar)
  • Strong background in testing strategies and frameworks
  • Experience building responsive, accessible web applications
  • Understanding of RESTful APIs and modern build tools
  • Experience in payments, fintech, fraud prevention, or financial services
  • Backend development experience with Java/Spring, Docker, Kubernetes, or AWS
  • Track record building secure, observable APIs and distributed systems
  • Experience with micro-frontend architectures or component library development
  • Location & Eligibility

    Where is the job
    San Francisco, United States
    On-site at the office
    Who can apply
    US
    Listed under
    Worldwide

    Listing Details

    Posted
    September 24, 2025
    First seen
    March 26, 2026
    Last seen
    June 6, 2026

    Posting Health

    Days active
    71
    Repost count
    0
    Trust Level
    42%
    Scored at
    June 6, 2026

    Signal breakdown

    freshnesssource trustcontent trustemployer trust
    Finix
    Finix
    lever

    Finix Payments specializes in enabling businesses to create seamless payment experiences, driving revenue growth while reducing operational complexities.

    Employees
    125
    Founded
    2015
    View company profile
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    FinixSenior Frontend EngineerUSD 160000–235000