Java Backend Sr - Miami

Medium; Miami (FL); On-site; USD 110,000 - 130,000; Full time

Benefits offered by this job

Dynamic work environment

Long-term contract engagement

High visibility role

Job summary

Medium is seeking a Senior Java Microservices Developer to lead the design and development of event-driven microservices in a high-impact project. This contract role requires hands-on experience in Java, Spring Boot, and AWS, and is based in the Miami / Fort Lauderdale area.

The ideal candidate will own their code from design to production and integrate advanced AI systems into the development workflows effectively. A collaborative and dynamic environment awaits with potential for substantial contributions to technical strategy.

Qualifications

• 8+ years experience in backend services using Java.
• 2+ years in microservices and event-driven systems.
• Production experience with AWS services.
• Proficiency in AI-assisted development tools.

Responsibilities

• Design and build Spring Boot microservices.
• Implement publish/subscribe async messaging.
• Design and consume REST APIs.
• Build CI/CD pipelines on AWS.
• Diagnose issues across distributed services.
• Integrate LLMs and build agentic workflows.

Skills

Java

Microservices

Spring Boot

AWS

Event-driven systems

Testing (JUnit, Mockito)

AI-assisted development

Tools

Docker

Kubernetes

Terraform

Job description

About Us

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.

What To Expect In This Role (Responsibilities)

• Backend Architecture & Execution: Design, build, test, and deploy Spring Boot microservices following strict team standards. Own your code from design to production.
• Distributed Systems & Event‑Driven Flows: Implement publish/subscribe async messaging and handle distributed transactions using saga or orchestration patterns.
• API Design & Integration: Design and consume REST APIs, webhooks, and subscription APIs, while actively contributing to API contracts and versioning.
• Cloud‑Native Engineering: Build and maintain CI/CD pipelines and infrastructure‑as‑code for your services, operating heavily on AWS.
• Operational Excellence: Diagnose and resolve issues across distributed services utilizing observability tools like New Relic, Datadog, or OpenTelemetry for logging, tracing, and metrics.
• 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.

Requirements

• 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.

Nice to Have

• 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.

Benefits

• On‑site collaboration in a dynamic and fast‑paced environment in the Miami / Fort Lauderdale area.
• Long‑term contract engagement with high impact and autonomy.
• Strategic and high‑visibility role within a modern engineering culture.
• Opportunity to influence technical strategy, especially regarding modern event‑driven architectures and AI integrations.
• Collaborative international team with strong technical leadership.