Flex - Senior Software Engineer, Backend Money Team
Requirements
• 5+ years of professional software engineering experience, with a focus on Java backend development(Spring core/web/boot, Gradle, JUnit, JVM tuning & performance). • Strong computer science fundamentals and proven experience designing scalable, distributed systems. • Experience integrating with payment processors, settlement, card networks, banking partners. • Strong understanding of transactional systems, financial data consistency, idempotency, auditability, and fault tolerance in distributed environments. • Skilled at working with both technical and non-technical stakeholders, aligning on scope and delivery. • Ability to write high-quality, testable, maintainable, and secure code. • Hands-on experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB), containerization (Docker/Kubernetes), and relational + NoSQL databases (MySQL, PostgreSQL, DynamoDB). • Proficient with CI/CD pipelines (GitHub Actions preferred), git, and build automation. • Familiar with observability and monitoring tools (e.g., DataDog) for maintaining service availability. • Excellent communicator, comfortable collaborating in globally distributed teams.
Responsibilities
• Design, build, and scale backend services and APIs that power Flex's core financial infrastructure, including payments, money movement, billing, settlements, reconciliation, and ledger systems. • Drive the delivery of highly impactful initiatives end-to-end, from requirements gathering and technical design through implementation, rollout, and operational excellence. • Partner closely with Product, Finance, Risk, Compliance, Operations, and cross-functional engineering teams to deliver scalable and compliant payment experiences. • Build robust systems that integrate with external payment processors, banking partners, card networks, and financial service providers. • Design and implement resilient payment, ledger, settlement, and reconciliation workflows that ensure financial accuracy across the ecosystem. • Operate mission-critical financial services in production with stringent uptime, security, compliance, and performance requirements. • Contribute to the evolution of Flex's service-oriented architecture, event-driven systems, APIs, message queues, and scalable financial platforms.
Benefits
• Flex takes a market-based approach to pay, and compensation may vary depending on your primary work location. Work locations are categorized into one of three tiers based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be commensurate with their experience, qualifications, and Flex’s internal leveling guidelines and benchmarks. • Tier 1 (NYC/Bay Area, Los Angeles, Seattle) • $172,000—$215,000 USD • Tier 2 (Austin, Washington D.C. Philadelphia, San Diego, Chicago, Atlanta) • $154,800—$193,500 USD • Tier 3 (Salt Lake City, all other USA cities) • $146,200—$182,750 USD • Life at Flex • Life at Flex • We understand that it takes a diverse team of highly intelligent, curious, determined, empathetic, and self aware people to grow a successful company. Our HQ is located in New York City, but we have employees located throughout the US, Australia, Canada and South America. We are growing quickly, but deliberately, with a focus on building an inclusive culture. Our dynamic team has incredible perspectives to share, just as we know you do, and we take great pride in being an equal opportunity workplace. • Roles posted in New York, San Francisco, and Salt Lake City are hybrid positions with on-site expectations of 2-3 days per week in our local offices. For candidates outside of these areas, you may be eligible for our relocation assistance program. • Competitive medical, dental, and vision • 401(k) plan with company match • Unlimited paid time off + 13 company paid holidays • Free Flex subscription • For full-time non-U.S. employees, we offer: • Competitive compensation + company equity
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