Senior Frontend Developer - Contract
Finix Payments
Software Engineering
Mexico City, Mexico
Posted on Jul 25, 2025
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.
About the role:
As an engineer on the Frontend Engineering Team, you will build and support the Finix payments management dashboards and our embeddable user-facing components.
In this Senior Front End Engineering role, you will support the technical design, implementation, testing, and production support of Finix's user-facing software products, continuously ensuring a reliable service for our customers. This is a team of focused engineers who each deliver significant value in a fast-paced environment. There's never a dull moment since we have many exciting new ideas to build and we work as a team to deliver the most value we can. 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:
- Work on the core UI/UX for customer-facing features and internal tools
- Design efficient and reusable components that power our web applications
- Architect our UI systems to scale and resolve performance issues
- Collaborate closely with Product, UX, and internal customer teams
- Mentor other team members on engineering best practices.
You Are:
- Able to balance delivering code, infrastructure, and tests against attention to quality
- Experienced in defining technical designs that meet user needs
- Skilled with disambiguating requirements, and identifying design implications
- Proactive in monitoring live systems and troubleshooting production issues
- Committed to documenting and communicating to share and preserve knowledge.
You Have:
- 6+ years of hands-on development with HTML, CSS/SCSS & JavaScript
- 3+ years of hands-on development in React
- Experience with State Management systems (Redux, Recoil, Jotai, and Zustand)
- Experience using and configuring testing frameworks
Bonus if you have:
- Payments, Fraud, Risk, or Finance background
- Experience with Spring, Gradle, Docker, K8s, and/or AWS infrastructure
- Previously implemented secure, highly available, and observable REST APIs and services