Staff Software Engineer

Summary

Join Flex, a NYC-based FinTech company, as a Staff Software Engineer in the Partner Engineering organization. You will contribute to building our payment integrations platform and user experiences, shaping the technical roadmap, and collaborating with cross-functional teams. This role demands hands-on execution, building flexible products, and working across APIs, SDKs, and web experiences. You will lead the delivery of impactful products, aligning stakeholders, and driving quality and consistency in code and architecture. The position requires significant experience in software engineering, Java, and working with various technologies. Flex offers competitive compensation and benefits, including comprehensive health insurance, 401k, unlimited PTO, and parental leave.

Requirements

• Minimum of 6 years experience in software engineering
• Minimum of 4 years experience with Java
• Experience leading the delivery of multiple highly impactful products end to end, on time with a high quality bar
• Experience working with technical and non-technical stakeholders, successfully aligning and setting expectations on scope and delivery
• Ability to drive yourself and your team to bring quality and consistency to their code and architecture, without compromising velocity
• Ability to grow in a fast-paced and dynamic environment that will challenge you to always bring your best
• Ability to work on a globally-distributed team with a high degree of ownership
• Experience working in FinTech and familiar with major payment rails
• Proficient in Java frameworks and tools used at Flex, including Spring (core/web/boot), Gradle, JUnit, and JVM (memory/performance tuning, GC)
• Experience with Service-Oriented Architecture, REST APIs, Message Queues, and scalable architectures
• Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools

Responsibilities

• Develop and maintain payment integrations platform and user experiences
• Shape the technical roadmap for the team
• Work with cross-functional teams (Engineering, Product, Design, Infrastructure, Sales, Partner, and Customer Success)
• Deliver high-quality products that meet customer needs and business goals
• Execute individual work and build flexible products

Preferred Qualifications

• Experience working on cross-functional teams involving product, design, and engineering
• Proficient in Java (Spring Boot), TypeScript (React.js/React Native)
• Familiar with CI/CD pipelines to improve code stability and quality
• Experience with cloud and containerized environments (Bonus: AWS, Kubernetes, MySQL)
• Comfortable working with IDEs such as VSCode, IntelliJ, XCode, and Android Studio
• Motivated to drive team effectiveness and engineering excellence

Benefits

• 100% company-paid medical, dental, and vision
• 401(k) + company equity
• Unlimited paid time off + 13 company paid holidays
• Parental leave
• Flex Cares Program: Non-profit company match + pet adoption coverage
• Free Flex subscription
• Competitive Pay
• Company Equity
• Unlimited PTO