Software Engineer II, Core Platform at Flex

Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2026 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team? Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2026 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team? As we continue to grow our talented team, we remain committed to radical transparency, integrity, and individual growth. We believe that your unique background and experience adds tremendous value to the organization and will empower you to take absolute ownership of business challenges and the execution of solutions. What we need: Flex is looking for a backend engineer to join our core platform team. We want engineers with ideas (because they’ll definitely be heard on our small and tight-knit team) and ambition! Successful devs will feel comfortable in a startup environment and will be happy to work in a remote-first team with a lot of independence. What you'll do • Design, implement and maintain our core service, such as Identity, Auth, Payment, Financial, Risk etc. • Scale out core platform to support business growth while maintaining performance and reliability • Continuously improving our daily operations with automation, tooling, design evolution, observability etc. What We’re Looking For: • 2+ years of experience in software development or a related field • Strong experience with Java and Python • Experience with relational and NoSQL databases, such as MySQL, PostgreSQL, and DynamoDB • Proactive working style with strong ownership • Experience in the payments domain; familiarity with the payment industry • Experience designing and developing fault-tolerant, scalable distributed systems • Experience with AWS cloud services, including ECS/EKS, Lambda, API Gateway, VPN, , S3, and RDS • Experience with infrastructure as code (e.g., AWS CLI, AWS CDK, Terraform) • Strong communication skills, with the ability to explain technical concepts to non-technical audiences • Adherence to engineering best practices, with the ability to propose and drive new improvements Flex takes a market-based approach to pay, and compensation may vary depending on your primary work location. Work locations are categorized into one of three tiers based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be commensurate with their experience, qualifications, and Flex’s internal leveling guidelines and benchmarks. • Tier A: (NYC/SF): $140,000 —$175,000 USD • Tier B: $126,000—$157,500 USD • Tier C: $119,000 —$148,750 USD Life at Flex 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. Offices Roles posted in New York, San Francisco, and Salt Lake City are hybrid positions with on-site expectations of 2-3 days per week in our local offices. For candidates outside of these areas, you may be eligible for our relocation assistance program. Benefits For full-time U.S. employees we offer: • Competitive medical, dental, and vision • Company equity • 401(k) plan with company match • Unlimited paid time off + 13 company paid holidays • Parental leave • Flex Cares Program: Non-profit company match + pet adoption coverage • Free Flex subscription For full-time non-U.S. employees, we offer: • Competitive compensation + company equity • Unlimited PTO