F

Senior Software Engineer, Money Team

Flex • United States
Relocation
This Job is No Longer Active This position is no longer accepting applications

Seeking a Senior Software Engineer to build and scale Flex's core financial infrastructure, including payments, billing, and money movement systems. This role requires technical leadership, driving architecture for mission-critical platforms, and ensuring security, reliability, and compliance. Ideal candidates have 5+ years of Java backend experience, strong distributed systems knowledge, and experience with financial integrations.

Key Highlights
Build and scale financial infrastructure for payments, billing, and money movement.
Provide technical leadership and drive architecture for critical financial platforms.
Partner with cross-functional teams to deliver high-impact financial solutions.
Key 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.
Technical Skills Required
Java Spring Distributed Systems
Benefits & Perks
Company equity
401(k) plan with company match
Unlimited paid time off
Nice to Have
AWS (EKS, Aurora RDS, Elasticache, DynamoDB)
Docker/Kubernetes
MySQL, PostgreSQL, DynamoDB
CI/CD pipelines (GitHub Actions preferred)
Git
Build automation
Observability and monitoring tools (e.g., DataDog)

Job Description

Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2026 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team?
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