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Flex

Backend Engineer

Flex

Backend Engineer designing and owning services and APIs for Flex’s health payment solutions. Collaborating with teams to ensure reliable systems that facilitate HSA/FSA spending.

Posted 5/2/2026full-timeRemote • 🇺🇸 United StatesMid-LevelSenior💰 $160,000 - $220,000 per yearWebsite

Tech Stack

Tools & technologies
GoNode.jsPythonRustTypeScript

About the role

Key responsibilities & impact
  • Design, build, and own backend services and APIs that power Flex’s applications
  • Model the domain - eligibility rules, transactions, merchants, consumer accounts, etc. - in data structures and APIs that other teams build on
  • Partner with frontend, design, and business stakeholders to translate merchant and consumer needs into reliable APIs and workflows
  • Own and improve our backend service architecture, data models, and integrations
  • Analyze, troubleshoot, and resolve production issues rooted in business logic, data correctness, and transactional edge cases
  • Collaborate on cross-functional projects that connect the full Flex experience, from consumer checkout to merchant analytics
  • Create and maintain documentation for APIs, services, and on-call runbooks
  • Contribute to a culture of learning, problem-solving, and operational excellence

Requirements

What you’ll need
  • 5+ years of experience building production backend services and APIs in a typed language (Rust, TypeScript/Node, Go, Python, etc.)
  • Strong relational database fundamentals and experience designing APIs that other teams or external partners depend on
  • You're resourceful, curious, and comfortable learning new tools quickly
  • You thrive in fast-paced, dynamic environments and enjoy wearing multiple hats
  • You're collaborative and enjoy working across teams to solve problems
  • You have an execution mindset and always keep the end user in mind
  • You're proficient at leveraging AI tools to ship faster.

Benefits

Comp & perks
  • Competitive compensation and equity package
  • Flexible, remote-friendly work environment

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
backend servicesAPIsRustTypeScriptNodeGoPythonrelational database fundamentalsdata modelstransactional edge cases
Soft Skills
resourcefulcuriouscollaborativeproblem-solvingexecution mindsetadaptabilitycommunicationlearningoperational excellencecross-functional collaboration