Staff Software Engineer, Fullstack (Marketing) at Flex in Remote

Summary: Flex is a growth-stage FinTech company headquartered in NYC, aiming to revolutionize the rent payment experience. They are seeking a Staff Software Engineer to develop and scale their platform and app experiences, focusing on user engagement and onboarding challenges. Responsibilities: - Focus on creating exceptional user and partner experiences that drive engagement and retention - Partner closely with product managers, designers, and data scientists, data analysts to identify and solve critical user onboarding challenges - Design, develop, test, and deploy robust APIs, services and data pipelines that enhance user onboarding and overall platform experience - Implement changes through an agile methodology, prioritizing rapid iteration and continuous improvement - Utilize data and analytics to measure the impact of your work and identify opportunities for optimization Required Qualifications: - 7+ years of professional software development experience - 3+ years of hands-on experience with Java - 3+ years of experience with React or React Native - 3+ years of experience with TypeScript - Having experience building high-quality mobile and web UIs to specifications is a must to have - 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 architectures and tools in React Native and React ecosystems (Hooks, Components, Context, Redux) - Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools Preferred Qualifications: - Have the experience to build and improve user onboarding funnel and design the comprehensive experiment to drive metric improvements - Proficient in CI/CD systems (preferably GitHub Actions), git, and automation - Skilled in observability and monitoring tools, such as DataDog, to ensure high availability - Experienced with big data platforms and tooling, including Snowflake - Proficient in Infrastructure as Code, using tools like CDK and Terraform - Skilled at elevating team standards through best practices, and mentoring junior engineers - Excellent written and verbal communicator, with experience in cross-functional collaboration Required Skills: Java, React, TypeScript, AWS Important Skills: Service-Oriented Architecture, CI/CD systems, Infrastructure as Code Nice-to-Have Skills: Observability tools, Big data platforms Benefits: Competitive medical, dental, and vision available from Day 1, Company equity, 401(k) plan with company match (our company match kicks off at the beginning of 2026), Unlimited paid time off + 13 company paid holidays, Parental leave, Flex Cares Program, Free Flex subscription, Competitive compensation + company equity, Unlimited PTO