Finix

Senior Frontend Engineer

Reposted 15 Hours Ago

San Francisco, CA, USA

In-Office

160K-235K Annually

Senior level

Fintech • Payments • Professional Services

Finix offers everything SaaS companies need to build a world-class payments experience.

The Role

As a Senior Frontend Engineer, you'll architect and build payment experiences, maintain payment dashboards, and mentor engineers while driving frontend architecture decisions.

Summary Generated by Built In

About Us

Move money. Make money. Finix is a full-stack acquirer processor, empowering businesses of all sizes with flexible, modern payment solutions. Processing billions of dollars annually, Finix enables SaaS, marketplace, and e-commerce platforms to accept payments, manage payouts, and onboard merchants seamlessly. With our no-code, low-code, and developer-friendly tools, businesses can get up and running in hours—not months.

Finix has raised over $175M, including a $75M Series C led by Acrew Capital, with participation from Lightspeed Venture Partners, Leap Global, American Express Ventures, Bain Capital Ventures, Homebrew, Inspired Capital, Sequoia 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.

You Will:

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

You Are:

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

You Have:

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

Bonus if you have:

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

Skills Required

6+ years of production experience with modern web technologies
3+ years of hands-on React development in complex applications
Solid experience with state management solutions
Strong background in testing strategies and frameworks
Experience building responsive, accessible web applications
Understanding of RESTful APIs and modern build tools

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The Company

HQ: San Francisco, CA

156 Employees

Year Founded: 2015

What We Do

Finix is on a mission to create the most accessible financial services ecosystem in history. To do so, we are building the global operating system for fintech, starting with payments. Since 2015, we’ve been busy creating a payments management solution specifically for SaaS platforms—from startups to publicly traded companies—that want to earn more revenue, reduce churn, and delight customers. With one developer-friendly API, Finix helps companies accept payments, manage payouts, and onboard merchants—all in the same place. Finix offers everything SaaS companies need to build a world-class payments solution.

Why Work With Us

Our diverse team of fintech professionals is dedicated to building accessible payments tools that democratize financial access. From employee development to customer success, we believe in the campsite rule—“leave it better than you found it”—ensuring every client and Finixian is better after working with us.