[Remote] Staff Software Engineer, Partner Integrations

Note: The job is a remote job and is open to candidates in USA. Flex is a growth-stage FinTech company headquartered in NYC, focused on improving the rent payment experience. They are seeking a Staff Software Engineer to join their Partner Engineering team, responsible for building and maintaining a payment integrations platform and collaborating with various teams to deliver impactful features.

Responsibilities

• Design, implement, and maintain our payment integrations platform, including partner APIs, SDKs, and embedded web experiences
• Help shape and drive the technical roadmap for the Partner Engineering team
• Design and develop scalable APIs and integrations to support money movements across our banking partners via payment rails such as ACH
• Work cross-functionally with Engineering, Product, Design, Infrastructure, Sales, Partner, and Customer Success to deliver high-impact features
• Scale our integrations platform to support business growth while maintaining performance and reliability
• Continuously improve daily operations through automation, tooling, design evolution, and observability
• Mentor engineers and elevate team standards through best practices, code reviews, and technical guidance

Skills

• Minimum 6 years of experience in software engineering
• Minimum 4 years of experience with Java; proficient in Spring (core/web/boot), Gradle, JUnit, and JVM tuning
• Experience with Service-Oriented Architecture, REST APIs, message queues, and scalable distributed systems
• Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization
• Experience leading delivery of multiple high-impact products end to end, on time with a high quality bar
• Ability to work on a globally-distributed team with a high degree of ownership
• Experience aligning technical and non-technical stakeholders on scope and delivery
• Experience in FinTech and familiarity with major payment rails
• Ability to drive quality and consistency across your team without compromising velocity
• Proficient in CI/CD systems (preferably GitHub Actions) and automation
• Skilled in observability and monitoring tools such as DataDog
• Experienced with big data platforms including Snowflake
• Proficient in Infrastructure as Code (CDK, Terraform)
• Excellent written and verbal communicator with cross-functional collaboration experience

Benefits

• Competitive medical, dental, and vision
• Company equity
• 401(k) plan with company match
• Unlimited paid time off + 13 company paid holidays
• Parental leave
• Free Flex subscription
• Competitive compensation + company equity
• Unlimited PTO

Company Overview

Company H1B Sponsorship