Java Backend Sr - Miami

Coderio designs and delivers scalable digital solutions for global companies. We combine strong technical expertise with a product mindset to lead complex software initiatives end-to-end. We work with international clients, value autonomy and clear communication, and build long-term partnerships through technical excellence.

🌍 More information: http://coderio.com

This is a high-impact technical role. We are looking for a Senior Java Microservices Developer for a contract engagement. You will own the design, development, and delivery of a suite of event-driven microservices running on AWS. Operating strictly on-site in the Miami / Fort Lauderdale area, you will be a key player in an established engineering team, bringing deep technical expertise in distributed systems and leveraging modern AI tools and agentic workflows to build production-grade services.

This is a hands-on execution role. You are responsible for the technical health of the codebase, the performance of the architecture, and delivering high-quality software that scales.

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  Backend Architecture & Execution: Design, build, test, and deploy Spring Boot microservices following strict team standards. You will own your code from design to production.

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  Distributed Systems & Event-Driven Flows: Implement publish/subscribe async messaging and handle distributed transactions using saga or orchestration patterns.

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  API Design & Integration: Design and consume REST APIs, webhooks, and subscription APIs, while actively contributing to API contracts and versioning.

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  Cloud-Native Engineering: Build and maintain CI/CD pipelines and infrastructure-as-code for your services, operating heavily on AWS.

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  Operational Excellence: Diagnose and resolve issues across distributed services utilizing observability tools like New Relic, Datadog, or OpenTelemetry for logging, tracing, and metrics.

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  Advanced AI & Agentic Workflows: Integrate LLMs into services (function/tool calling, structured outputs, and the Model Context Protocol) and build agentic workflows, ensuring AI safety and governance (guardrails, PII/PCI handling) in a regulated setting.

• Technical Foundation: Senior level with 8+ years of experience building backend services in Java, and at least 2+ years specifically in microservices and event-driven systems.

• Stack Expertise: Deep, hands-on mastery of Java (17+ preferred) with strong OOP and concurrency fundamentals, alongside production experience in Spring Boot and Spring Cloud.

• Cloud Architecture: Solid, demonstrable production experience with AWS services including DynamoDB, Kinesis, SQS, SNS, KMS, API Gateway, ECS/EKS, Lambda, IAM, and RDS.

• AI Proficiency: Fluency with AI-assisted development (like Claude Code or Copilot) with the critical judgment to review AI-generated code.

• Testing Discipline: Solid testing discipline utilizing JUnit, Mockito, and integration testing.

• Location & Engagement: Must be located in the Miami / Fort Lauderdale area and available to work 100% on-site for a contract engagement.

• Financial services or payments domain experience, specifically with payments messaging standards like ISO 20022 and the legacy FAIM (Fedwire) format.

• Experience with containers and orchestration (Docker, Kubernetes).

• Hands-on experience with Infrastructure as Code (Terraform, CloudFormation, or CDK).

• Experience with workflow and orchestration engines such as Temporal, Camunda, or AWS Step Functions.

• Advanced AI skills: vector stores/RAG, prompt engineering, and AI observability.