[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.

Responsibilities

• Design, build, and ship backend services that support user-facing features across mobile and web experiences
• Collaborate closely with frontend engineers, product managers, designers, and data partners
• Lead backend technical planning and contribute to architecture decisions that improve scalability, reliability, and performance
• Proactively identify opportunities to improve user experience through backend optimizations and system enhancements
• Build and maintain clear technical documentation to support a growing and distributed engineering organization

Skills

• 5+ years of professional experience building and scaling backend systems in consumer technology or fintech environments
• Experience designing and operating distributed systems, APIs, and data flows that support user facing applications
• Familiarity with message brokers and event driven systems, as well as caching and performance optimization strategies
• Demonstrated ability to lead technical execution, mentor other engineers, and deliver with a high bar for quality
• Drive and proactivity – everyone here is a builder and executor
• Familiarity with functional programming concepts

Benefits

• Competitive base salary, stock options, and health benefits from Day 1
• 401(k) plan with company match
• Remote-friendly (US), flexible time off (FTO), and opportunities for growth
• A high-growth, mission-driven, inclusive culture where your work has real impact

Company Overview