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Senior Software Engineer, Fullstack

FlexNew York, New York, United States; Remote; San Francisco, California, United States
Remote Full-time

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Qualifications

Key ResponsibilitiesDesign and implement outstanding user and partner experiences that enhance engagement and retention. Collaborate closely with product managers, designers, and data analysts to address and resolve key user onboarding challenges. Develop, test, and deploy robust APIs, services, and data pipelines to optimize the user onboarding process and overall platform experience. Embrace an agile methodology to implement changes, focusing on rapid iteration and continuous improvement. Leverage data and analytics to evaluate the impact of your contributions and identify areas for enhancement. Minimum Qualifications5+ 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. Proven ability to create high-quality mobile and web user interfaces that meet specifications. Strong proficiency in Java frameworks and tools utilized 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. Familiarity with React Native and React ecosystems (Hooks, Components, Context, Redux) is a plus.

About the job

Join Flex, a rapidly growing FinTech company headquartered in New York City, as we revolutionize the rent payment process. It's 2026, and we believe that paying rent should be affordable, flexible, and hassle-free. Our mission is to empower renters with the ability to pay their rent on a schedule that aligns with their financial needs. After establishing a strong foundation of investor support and a dedicated user base, we are seeking passionate individuals to join our team and help us drive our mission forward.

As a Senior Fullstack Software Engineer, you will play a crucial role in propelling our company’s growth. Your expertise will be vital in developing and scaling our platform and application experiences, ultimately facilitating our ambitious goal of achieving 10x growth.

About Flex

Flex is at the forefront of FinTech innovation, transforming how renters manage their payments. Our mission is simple yet powerful: to provide renters with the flexibility they deserve in handling their largest recurring expense. We are dedicated to creating a seamless experience that alleviates the financial stress associated with traditional rent payments. Join us in making a meaningful impact on the lives of renters across the country.

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