[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.ResponsibilitiesDesign, implement, and maintain our payment integrations platform, including partner APIs, SDKs, and embedded web experiencesHelp shape and drive the technical roadmap for the Partner Engineering teamDesign and develop scalable APIs and integrations to support money movements across our banking partners via payment rails such as ACHWork cross-functionally with Engineering, Product, Design, Infrastructure, Sales, Partner, and Customer Success to deliver high-impact featuresScale our integrations platform to support business growth while maintaining performance and reliabilityContinuously improve daily operations through automation, tooling, design evolution, and observabilityMentor engineers and elevate team standards through best practices, code reviews, and technical guidanceSkillsMinimum 6 years of experience in software engineeringMinimum 4 years of experience with Java; proficient in Spring (core/web/boot), Gradle, JUnit, and JVM tuningExperience with Service-Oriented Architecture, REST APIs, message queues, and scalable distributed systemsExperience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerizationExperience leading delivery of multiple high-impact products end to end, on time with a high quality barAbility to work on a globally-distributed team with a high degree of ownershipExperience aligning technical and non-technical stakeholders on scope and deliveryExperience in FinTech and familiarity with major payment railsAbility to drive quality and consistency across your team without compromising velocityProficient in CI/CD systems (preferably GitHub Actions) and automationSkilled in observability and monitoring tools such as DataDogExperienced with big data platforms including SnowflakeProficient in Infrastructure as Code (CDK, Terraform)Excellent written and verbal communicator with cross-functional collaboration experienceBenefitsCompetitive medical, dental, and visionCompany equity401(k) plan with company matchUnlimited paid time off + 13 company paid holidaysParental leaveFree Flex subscriptionCompetitive compensation + company equityUnlimited PTOCompany OverviewFlex enables people to pay rent bills on a schedule that fits their personal finances. It was founded in 2019, and is headquartered in New York, New York, USA, with a workforce of 201-500 employees. Its website is https://getflex.com.Company H1B SponsorshipFlex has a track record of offering H1B sponsorships, with 1 in 2025, 1 in 2024. Please note that this does not guarantee sponsorship for this specific role.