Senior Software Engineer, Backend - Payments - Remote

Overview

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 2025 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?

In Short

• Flex is looking for a Senior Software Engineer to implement backend systems supporting business features.
• Responsibilities include designing, developing, testing, and scaling systems.
• Work closely with product, design, and engineering teams.
• Lead scoping, design, and implementation for APIs.
• Roll out changes in an agile manner with small, frequent iterations.
• Minimum of 6 years experience in software engineering required.
• Proficiency in Java and related frameworks is essential.
• Experience with AWS and containerization tools is preferred.
• Strong communication skills and ability to work with stakeholders are important.
• Competitive pay and benefits offered.

Requirements

• Minimum of 6 years experience in software engineering.
• Minimum of 4 years experience with Java.
• Ability to work on a globally-distributed team.
• Experience with technical and non-technical stakeholders.
• Experience building robust, fault-tolerant systems.
• Proficient in Java frameworks such as Spring.
• Experience with REST APIs and scalable architectures.
• Experience with AWS services like EKS and Aurora RDS.
• Knowledge of CI/CD systems and automation.
• Excellent written and verbal communication skills.

Benefits

• Competitive pay.
• 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.