Senior Software Engineer (Go Tooling)

About EarnIn As one of the first pioneers of earned wage access, our passion at EarnIn is building products that deliver real-time financial flexibility for those with the unique needs of living paycheck to paycheck. Our community members access their earnings as they earn them, with options to spend, save, and grow their money without mandatory fees, interest rates, or credit checks. We’re fortunate to have an incredibly experienced leadership team, combined with world-class funding partners like A16Z, Matrix Partners, DST, Ribbit Capital, and a very healthy core business with a tremendous runway. We’re growing fast and are excited to continue bringing world-class talent onboard to help shape the next chapter of our growth journey. POSITION SUMMARY EarnIn is seeking a Senior Frameworks Engineer to design, build, and evolve the shared frameworks and libraries that power our microservices and APIs across multiple runtimes, with a primary focus on Golang and secondary support for Kotlin/Spring Boot. As part of the Developer Experience team, you will be a domain expert who strengthens the foundational plumbing of our services—including bootstrappers, observability, authentication, communication protocols, and CI/CD scaffolding. You will deliver impactful solutions that simplify complexity for developers, enabling them to build high-quality, scalable systems more efficiently. In this role, you’ll collaborate closely with teammates and cross-functional partners, contribute to technical strategy through thoughtful design and implementation, and advocate for frameworks that improve both developer experience and customer outcomes. You will balance short-term deliverables with long-term maintainability, mentor junior engineers, and model mission-driven ownership, creativity, and resilience. This position will ideally be hybrid from our Mexico City office as part of our expanding site, though a remote arrangement is possible. EarnIn provides excellent employee benefits, including healthcare, internet/cell phone reimbursement, a learning and development stipend, and potential opportunities to travel to our Mountain View HQ. Our salary ranges are determined by role, level, and location. WHAT YOU'LL DO Design, implement, and maintain core frameworks and libraries in Golang that support bootstrapping, shared services, observability hooks, authentication, RPC/REST tooling, and CI/CD templates. Partner with the Kotlin framework owner and other engineers to ensure cross-runtime consistency, enabling a unified developer experience across Go, Kotlin, and other supported runtimes. Build reusable components for logging, tracing, metrics, configuration management, rate limiting, and service-to-service communication. Keep shared frameworks aligned with evolving industry standards (e.g., OpenTelemetry, gRPC/HTTP middleware, Go upgrades, Spring Boot integrations), reducing fragmentation and technical debt. Participate in architecture and design reviews, provide well-thought-out recommendations, and advocate for best practices. Deliver solutions that balance speed, quality, and scalability, ensuring testing, monitoring, and performance considerations are built into your work. Contribute to code reviews and support teammates through documentation, guidance, and collaborative problem-solving. Collaborate across platforms, backend, and ML teams to design framework features that improve productivity while meeting customer needs. Demonstrate ownership by anticipating near-term challenges, proactively mitigating risks, and following through on commitments with transparency and integrity. WHAT WE'RE LOOKING FOR Bachelor’s or Master’s degree in Computer Science, Software Engineering, or related field (or equivalent practical experience). 4+ years of software development experience, including contributions in framework, platform, or infrastructure engineering. Strong expertise in Golang and experience building frameworks, libraries, or develo ... (truncated, view full listing at source)