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# Senior Software Engineer, Backend

- **Company:** Flex Ltd.
- **Location:** Brazil, IN, United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Architectural Patterns, Software Engineering, Backend, Low Latency, Microservices
- **Published:** September 8, 2026
- **Apply:** https://www.careerjet.com/job/register/us152e39c6391c3807efa475cb862d8088

## About the Role

Flex Fuels Ambition. The Role We are looking for engineers who are excited to be part of our early story and help us build a diverse and vibrant company. As a senior software engineer you will have the opportunity to work across the entire stack with a focus on the back-end. You will have the opportunity to learn and drive the creation of financial products and experiences to help our customers reach their full potential. You should have a strong sense of ownership and enjoy taking projects from inception to release. As an early employee, you'll be working with a nimble team of committed and talented engineers and having a large, long-term impact on technical design and engineering culture. We are open to candidates from Canada, the United States, and Colombia. What You'll Do - Ownership over large domains and features related to card processing/issuing, and core ledgering of financial transactions - Play a critical role in the development, design, and
maintenance of Flex's platform and services. - Architect well thought-out services and data models that ensure Flex's continued growth - Own problems end-to-end, thinking through everything from api contracts, data, scalability, security, observability, and metrics. - Lead by example and mentor engineers in all aspects of planning, development and testing. - Be a catalyst for driving best-in-class technology frameworks and tooling while staying engaged with the latest technology trends. - Be on call, with the expectation to ability to solve problems and find solutions for the servicing team What You Need - Proficiency in NodeJS+Typescript and server design principles. - An understanding and interest in architectural patterns for highly available, scalable, low-latency, asynchronous systems - Ability to hold yourself and the team to high standards. - Strong communication (written and verbal) and interpersonal skills. - Ability to provide in-depth
evaluation of multiple technical directions and determine tradeoffs of each. - Strong propensity to make data-driven decisions on technical architecture and project prioritization. - Exposure to modular monoliths and micro-services along with the benefits and challenges they bring.

## Description

company by delivering a product that is fundamentally better-not incrementally improved. Flex has raised $100M+ in equity and $300M+ in debt. - Mission-critical problems : We build software that directly controls how money moves at scale. - High bar, low ego : Small teams, exceptional people, real ownership. - Speed over comfort : We prioritize execution, quality, clarity, and results. - Enduring impact : What we're building will define how a generation of owners runs their businesses. Team & Locations We hire exceptional people who want to build hard things and see their work matter immediately. Roles are available in: San Francisco, Miami, New York, and fully remote.


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