[Remote] Backend Software Engineer, Core App

Note: The job is a remote job and is open to candidates in USA. OnePay is a consumer fintech trusted by millions of Americans to make money better. As a Backend Software Engineer on the Core App Team, you will build backend systems that directly power mobile and web user experiences.ResponsibilitiesDesign, build, and ship backend services that support user-facing features across mobile and web experiencesCollaborate closely with frontend engineers, product managers, designers, and data partnersLead backend technical planning and contribute to architecture decisions that improve scalability, reliability, and performanceProactively identify opportunities to improve user experience through backend optimizations and system enhancementsBuild and maintain clear technical documentation to support a growing and distributed engineering organizationSkills5+ years of professional experience building and scaling backend systems in consumer technology or fintech environmentsExperience designing and operating distributed systems, APIs, and data flows that support user facing applicationsFamiliarity with message brokers and event driven systems, as well as caching and performance optimization strategiesDemonstrated ability to lead technical execution, mentor other engineers, and deliver with a high bar for qualityDrive and proactivity – everyone here is a builder and executorFamiliarity with functional programming conceptsBenefitsCompetitive base salary, stock options, and health benefits from Day 1401(k) plan with company matchRemote-friendly (US), flexible time off (FTO), and opportunities for growthA high-growth, mission-driven, inclusive culture where your work has real impactCompany OverviewFrom spending and saving to borrowing and building better financial habits, OnePay brings people’s financial needs together in one place. It is a sub-organization of Walmart. It was founded in 2020, and is headquartered in New York, New York, USA, with a workforce of 501-1000 employees. Its website is https://www.onepay.com.