San Francisco, United States of America Hybrid Employment $55,000 - $100,000 a year

Flex is hiring a Senior Software Engineer, Backend

About the Role

Shape the future of financial infrastructure by building systems that power how business owners manage and move money. In this role, you’ll take full ownership of critical backend domains including transaction processing, card issuance, and core ledger architecture. Your work will directly influence the reliability, security, and scalability of a platform designed for real-world financial impact.

What You’ll Do

  • Lead the end-to-end design and implementation of backend services that handle high-volume financial transactions
  • Architect robust data models and API contracts with a focus on scalability, observability, and fault tolerance
  • Collaborate across engineering and product to solve complex challenges in payments, compliance, and risk systems
  • Mentor engineers in best practices for development, testing, and system design
  • Drive adoption of modern tooling and frameworks while staying current with evolving cloud and backend technologies
  • Support production systems as part of an on-call rotation, ensuring rapid resolution of operational issues

What We’re Looking For

  • Proven experience shipping scalable backend systems using Node.js and TypeScript
  • Solid grasp of distributed systems, asynchronous processing, and cloud infrastructure (GCP, AWS, or Azure)
  • Experience designing for high availability, low latency, and secure data handling
  • Ability to evaluate technical tradeoffs and advocate for data-informed decisions
  • Track record of delivering complex software products in production environments
  • Strong communication skills and a collaborative mindset
  • Familiarity with both modular monoliths and microservices architectures
  • At least four years of industry experience building backend platforms at scale

Why This Matters

You’re not just writing code—you’re shaping the backbone of a financial platform that handles real money, real risk, and real consequences. This is a chance to work on foundational systems where performance and correctness are non-negotiable. You’ll operate with autonomy, surrounded by builders who care deeply about impact, quality, and long-term results.

Work Environment

This role supports hybrid work with team hubs in San Francisco, Miami, and New York, and full remote options available. We value speed, clarity, and execution—without sacrificing technical rigor. You’ll have direct access to leadership and customers, and your contributions will carry significant weight in a lean, high-trust environment.

Required Skills
NodeJSTypeScriptGoogle CloudAWSAzureServer DesignHigh AvailabilityScalabilityLow-latency SystemsAsynchronous SystemsArchitectural PatternsSystem DesignCommunication SkillsTechnical EvaluationTradeoff Analysis NodeJSTypeScriptGoogle CloudAWSAzureServer DesignHigh AvailabilityScalabilityLow-latency SystemsAsynchronous SystemsArchitectural PatternsSystem DesignCommunication SkillsTechnical EvaluationTradeoff Analysis
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About company
Flex

Flex is a VC-backed company that empowers business owners with a new approach to finance. The company offers an AI-native, all-in-one business and personal finance platform designed for entrepreneurs and business owners.

Flex provides premium business banking, flexible net-60 credit, accounts payable automation, and dynamic capital solutions — all integrated into a seamless platform. The company aims to simplify financial operations so owners can focus on growing their businesses.

Recognized as one of Fast Company’s 2026 Most Innovative Companies, Flex combines institutional-grade financial tools with modern technology to serve the needs of modern businesses globally.

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Job Details
Department Engineering
Category backend
Posted 8 months ago