Backend Engineer
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Job Description
Backend Engineer designing and owning services and APIs for Flex’s applications. Collaborating with teams to build reliable systems that unlock HSA/FSA spending.
Responsibilities:
- 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:
- 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:
- Competitive compensation and equity package
- Flexible, remote-friendly work environment
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