Senior Software Engineer (Backend) - Payments

The Role We are looking for a Senior Software Engineer with experience in high-stakes, transaction-heavy systems. You will work across payment infrastructure and platform services, and your decisions will directly affect the reliability of merchant money flows. What You Will Do Design and build backend services for payment infrastructure — idempotency guarantees, retry queues, reconciliation flows, and crash-safe state management Own systems in production — monitor, respond to incidents, and continuously improve reliability, not just ship and move on Partner with product and business stakeholders to translate requirements into well-scoped engineering solutions, driving work end-to-end from design through to production Contribute to shared platform services that every tribe depends on, and drive system design reviews that raise the engineering bar Proactively identify hard problems — race conditions, ordering guarantees, blast-radius risks — before they reach production Instrument services for observability and own alerting for the systems you build Communicate risk, tradeoffs, and timelines clearly to both technical and non-technical stakeholders Use AI tools to accelerate development with discipline — scope, steer, and validate the output Mentor engineers and build reusable patterns that raise the team's collective output What We Hold The Bar On Correctness on Money-Movement Our systems move real merchant money. Idempotency, crash recovery, and safe state management are first principles — engineers here design with failure in mind from the start. Proactive Risk Identification We look for engineers who surface edge cases, failure modes, and architectural risks early — and come with a view on how to address them, without waiting to be asked. Considered Use of AI Tools We expect engineers to use AI tools to move faster — and to bring the judgment to validate outputs critically and take full ownership of what gets shipped. Required What We Are Looking For 4–6+ years of professional backend software engineering experience Bachelor's degree in Computer Science, Engineering, or a related technical field Proficiency in Java (Spring Boot) or equivalent JVM-based backend frameworks Strong command of system design fundamentals — distributed transactions, idempotency, event-driven architecture, caching, and fault tolerance Hands-on experience with relational databases and message queues in production systems Working knowledge of cloud infrastructure (AWS preferred) and container-based deployments Ability to instrument and own observability and alerting for the services you build Excellent written and verbal communication skills — able to articulate tradeoffs and risks to both technical and non-technical stakeholders Strong Signals Fintech, payments, or transaction-heavy platform experience where correctness is a first principle Designed idempotency, retry logic, and reconciliation flows from scratch — not just consumed them Evidence of thinking ahead of the build: design docs, RFCs, post-mortems, or open-source contributions