Senior Frontend Engineer

Finix • San Francisco, CA

90d • $180,000 - $220,000

About The Position

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.

Requirements

• 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

Nice To Haves

• 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

Responsibilities

• 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

Benefits

• Equity
• Health insurance
• 401k
• Paid time off

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Number of Employees: 101-250 employees