Back End Developer

HIRING || REMOTESenior Software Engineer - Backend-focused / Rust Location: Costa Rica
ABOUT THE ROLE We're looking for a Senior Software Engineer to join a highly technical, cross-functional squad building a high-throughput data platform for a global financial intelligence client.You'll work primarily on the backend, contributing to a Rust-based microservices architecture that handles millions of entities and audit events at scale.The platform is largely in place, your job is to execute with confidence, ship quality code, and collaborate closely with architects to evolve it further.This is approximately 95% backend application work, with a small React frontend footprint for the right candidate.
THE STACK • Rust (primary language — strong proficiency required).• Event-driven microservices with Kafka / Confluent.• PostgreSQL for transactional data; transactional outbox pattern.• AWS (EC2, ECS, Lambda, etc.) and Kubernetes.• Infrastructure as Code on existing AWS patterns.• React (single-page app — bonus, not required).• GenAI tooling, specifically Claude, for developer productivity.
WHAT YOU'LL DO • Design, build, and maintain scalable backend services and APIs in Rust.• Own and execute large portions of defined workstreams end-to-end. You will need to work with ambiguity and help clear it up to complete the work.• Work alongside a senior architect — bring sound technical input to design discussions.• Build on top of existing AWS infrastructure patterns using IaC.• Collaborate across a squad of ~14: engineers, QA, product, UX, and DevOps.• Ensure code quality, performance, and observability across all deliverables.• Contribute to code reviews and informally mentor less experienced engineers.• Proactively surface blockers and technical risks before they become problems.
WHAT WE'RE LOOKING FOR • 3–7 years of experience delivering production software applications.• Solid, demonstrable Rust skills — this is non-negotiable for the role .• Hands-on experience with event-driven or microservices architectures .• Strong understanding of relational database design and queries (PostgreSQL is a plus) .• Familiarity with AWS services and cloud-native infrastructure.• Comfortable with Kubernetes and containerized deployments.• Independently productive — you know when to ask for help and when to get on with it.• Strong communicator who can engage effectively in a distributed, international team• Familiarity with GenAI coding tools (e.g. Claude) as part of your daily workflow• Experience with observability practices (distributed tracing, Open Telemetry, etc.) a plus• React experience is a bonus