Staff Software Engineer, Backend
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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. • Experience leading the delivery of multiple high-impact projects end-to-end. • 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. • Bonus: Experience in FinTech and familiarity with major payment rails; experience with big data platforms (e.g., Snowflake); Infrastructure as Code (CDK/Terraform).
Responsibilities
• Design, build, and scale backend services and APIs that power Flex’s consumer apps, partner integrations, and core platforms. • Provide technical leadership and guidance on system architecture, long-term vision, and team best practices. • technical leadership and guidance • Lead the delivery of highly impactful products end-to-end, from requirements gathering to rollout, with high quality and timeliness. • Work closely with product, design, and cross-functional teams to translate requirements into robust technical solutions. • Build robust, fault-tolerant systems with multiple external dependencies in distributed environments. • Drive adoption of best practices across the engineering org, including testing, observability, automation, and CI/CD. • Mentor and support engineers on the team, raising the technical bar and fostering growth. • Operate services in production with high availability, leveraging monitoring and observability tools. • Contribute to evolving Flex’s service-oriented architecture, REST APIs, message queues, and scalable system design. • Balance hands-on execution with architectural decision-making, ensuring velocity and long-term maintainability.
Benefits
• For working locations in NY/NJ/CA, the base salary pay range will be $221,000-$262,000 • For all other states, the base salary pay range will be $199,000-$236,000 • 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. • Competitive medical, dental, and vision available from Day 1 • 401(k) plan with company match (our company match kicks off at the beginning of 2026) • Unlimited paid time off + 13 company paid holidays • Flex Cares Program • Free Flex subscription • For full time non-US employees, we offer • Competitive compensation + company equity • Create a Job Alert • Interested in building your career at Flex? Get future opportunities sent straight to your email.