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Staff Software Engineer, Backend
Location
United States
Posted
5 days ago
Salary
$200K - $250K / year
Seniority
Lead
Job Description
Staff Software Engineer, Backend
Flex
• 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. • Lead the architecture and evolution of highly available, fault-tolerant financial platforms that process and track millions of dollars in transactions with accuracy, reliability, and auditability. • Provide technical leadership and guidance on distributed systems design, financial data consistency, transaction integrity, and long-term platform strategy. • 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 ledger, settlement, and reconciliation workflows that ensure financial accuracy across the ecosystem. • Drive adoption of engineering best practices across the organization, including observability, automated testing, reliability engineering, CI/CD, and secure software development. • Mentor and support engineers on the team, raising the technical bar and fostering a culture of technical excellence and ownership. • 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. • Balance hands-on execution with architectural leadership, ensuring both rapid delivery and long-term maintainability of critical money movement systems.
Job Requirements
- 6–8+ years of professional software engineering experience, with a focus on backend development.
- 4+ years of hands-on Java experience (Spring core/web/boot, Gradle, JUnit, JVM tuning & performance).
- Strong computer science fundamentals and proven experience designing scalable, distributed systems.
- Deep experience building or operating financial systems, including payments, money movement, ledgers, settlements, reconciliation, billing, or banking infrastructure.
- 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.
- Track record of mentoring engineers and raising team standards through best practices.
Benefits
- Competitive medical, dental, and vision
- Company equity
- 401(k) plan with company match
- Unlimited paid time off + 13 company paid holidays
- Parental leave
- Free Flex subscription
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