Senior Frontend Engineer

San FranciscoEngineering – Frontend /Full-time /On-siteAbout FinixFinix 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 othersAs 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 interfacesBuild performant, accessible, and reusable component libraries that scale across multiple productsLead technical design sessions and drive frontend architecture decisionsOptimize application performance for high-volume financial data processingCollaborate with Product, UX, and Engineering teams to translate complex payment workflows into intuitive user experiencesMentor engineers and establish frontend development standards and best practicesYou Are:Experienced in balancing rapid feature delivery with code quality, testing, and maintainabilitySkilled at translating business requirements into scalable technical solutionsProactive in monitoring live systems and troubleshooting production issuesComfortable working with ambiguous requirements and driving clarity through technical discoveryCommitted to knowledge sharing and building team capabilities through documentation and mentorshipYou 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 applicationsSolid experience with state management solutions (Redux, Zustand, Recoil, or similar)Strong background in testing strategies and frameworksExperience building responsive, accessible web applicationsUnderstanding of RESTful APIs and modern build toolsBonus if you have:Experience in payments, fintech, fraud prevention, or financial servicesBackend development experience with Java/Spring, Docker, Kubernetes, or AWSTrack record building secure, observable APIs and distributed systemsExperience with micro-frontend architectures or component library development$160,000 - $235,000 a yearFinix is an equal opportunity employer and values diversity. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability status, or any other protected class.Role: Software Engineer IVLevel: IC4-IC5Location: San Francisco, CABase Salary Range: $160,000/yr to $235,000/yr + equity + benefitsOur salary ranges are determined by role, level, and location. The range displayed on each job posting reflects the minimum and maximum target for new hire salaries at our headquarters in San Francisco, California. Individual pay is determined by work location, job-related skills, experience, and relevant education or training.Must be authorized to work in the U.S.; no visa sponsorship provided.We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.