Senior Software Engineer

We're looking for a Senior Backend Engineer (Full Stack Mindset) to join our Core UX Team , which owns the foundational services that drive user-facing experiences across EarnIn’s mobile and web platforms. This role is ideal for someone who thrives at the intersection of product and platform –bringing a backend-first perspective with a strong understanding of user experience needs, and is comfortable operating across service layers, infrastructure, and collaborating with frontend or mobile engineers to ship cohesive features. You’ll be responsible for designing and evolving Kotlin-based services, improving system reliability (including background workflows and queues), and enabling scalable product experiences that millions of members interact with daily. Design, implement, and evolve Kotlin-based backend services that support key user-facing product features. Break down complex product and system requirements into clean, scalable service architectures. Build and maintain asynchronous workflows, including job execution, messaging patterns, and queue-based processing. Contribute to the design and rollout of robust REST/gRPC APIs and data contracts used across mobile and web clients. Collaborate closely with mobile, frontend, product, and design teams to ensure consistency and cohesion across platforms. Own the reliability, observability, and performance of the services you build in production environments. Write well-tested, maintainable code and participate in continuous integration pipelines and automation frameworks. Participate in incident response and root cause analysis to help improve system resilience. Provide technical guidance and mentorship to other engineers through design reviews, pair programming, and architecture discussions. Contribute to team-wide planning and influence engineering strategy within the Core UX domain. Actively collaborate across domains, including product, data, finance, and analytics, to align services with real-world business needs.