Senior Software Engineer, Backend at Flex in Remote

Summary: Flex is a growth-stage FinTech company headquartered in NYC, focused on creating a better rent payment experience. They are seeking a Senior Software Engineer to implement backend systems that support various business features, working closely with product and design teams to enhance user experiences. Responsibilities: - Responsible for implementing the various backend systems that support all business features - Part of the backend engineer team, responsible for the services and integrations that power our products, such as Payment, Billing, Identity, partner integration, etc - Designing, developing, testing, and scaling systems needed to deliver great user and partner experiences - Work closely with product, design and engineering peers to solve users' most pressing problems around rent payment - Roll out changes to customers in an agile manner with a delivery cadence that favors small, frequent iterations - Lead scoping, design and implementation for APIs built and drive production rollouts to completion with minimum oversight Required Qualifications: - Minimum of 6 years experience in software engineering - Minimum of 4 years experience with Java - Ability to work on a globally-distributed team with a high degree of ownership - Experience working with technical and non-technical stakeholders, successfully aligning and setting expectations on scope and delivery - Ability to grow in a fast-paced and dynamic environment that will challenge you to always bring your best - Experience building robust, fault-tolerant systems with multiple external dependencies - Experience designing, building, and maintaining data pipelines - 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 Preferred Qualifications: - 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, Spring Framework, AWS Important Skills: REST APIs, CI/CD, Data Pipelines, Infrastructure as Code 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