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. The base salary range for this full-time position is $207,000 to $253,000, plus equity and benefits. Our salary ranges are determined by role, level, and location. This hybrid position requires in-person work from our Mountain View HQ 2 days a week.

WHAT YOU’LL DO

• 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.

WHAT WE’RE LOOKING FOR

• 5+ years of software engineering experience, with a track record of shipping and maintaining backend services.
• Strong Kotlin experience required, especially in backend systems.
• Proven experience working in microservice-based architectures and event-driven communication models.
• Hands-on experience designing and implementing REST/gRPC APIs and messaging workflows.
• Solid understanding of SQL databases, schema design, and performance optimization.
• Familiarity with distributed systems, including monitoring, alerting, and failure handling.
• Experience working with CI/CD pipelines and production deployment practices.
• Effective communication and collaboration skills across time zones and teams.
• Experience mentoring other engineers and providing technical leadership.
• Exposure to frontend or mobile client integration is a plus.
• Proactive interest in working with AI tools and on AI-driven solutions: You’ll have opportunities to use generative AI, automation, and AI-powered analytics to enhance our product and your workflow, driving innovation at EarnIn.
• Experience or interest in multiple backend technologies and languages: You’ll have the chance to work with or learn modern languages like Go, C#, and more, expanding your skill set and impact as our services evolve.
  #LI-Hybrid