Microservices Developer (US Citizens or Green Card Holders)

Please note that all applicants must be US Citizens or Green Card holders and no C2C candidates will be accepted. Summary: • Tier One Technologies is seeking a Microservices Developer to support our US Government client. • This will be a 100% remote contract-to-hire position. • SELECTED CANDIDATES WITHOUT REQUIRED CLEARANCE WILL BE SUBJECT TO A FEDERAL GOVERNMENT BACKGROUND INVESTIGATION TO RECEIVE IT. Responsibilities: • Design, build, and maintain Spring Boot microservices using Java 21 and Java 25. • Create and evolve RESTful APIs with clear contracts, versioning, and backward compatibility. • Implement input validation, error handling, idempotency, and standardized response models. • Integrate services with on-prem and AWS-hosted databases during migration phases. • Plan and execute data-access changes to support hybrid connectivity (on-prem to AWS) safely. • Optimize database interactions, including query tuning, connection pooling, and transaction boundaries. • Containerize services and maintain production-ready Docker images. • Deploy and operate services on Kubernetes with health probes, resource limits, and autoscaling. • Build and maintain CI/CD pipelines for build, test, security scan, and deployment automation. • Implement secure service-to-service and client authentication/authorization. • Manage secrets and configuration using AWS-native and Kubernetes-native approaches. • Add observability: structured logging, metrics, distributed tracing, dashboards, and alerting. • Troubleshoot incidents across application, container, cluster, network, and database layers. • Improve resiliency with retries, timeouts, circuit breakers, and graceful degradation patterns. • Participate in migration planning from on-prem infrastructure and data stores to AWS. • Support release validation in staging and production, including rollback readiness. • Write and maintain unit, integration, contract, and performance tests. • Address vulnerabilities by upgrading dependencies and remediating CVEs in application libraries. • Collaborate with QA, platform, security, and architecture teams on standards and best practices. • Document APIs, operational runbooks, and service ownership responsibilities. Qualifications: • A degree from an accredited College/University in the applicable field of services is required. If the individual's degree is not in the applicable field, then 4 additional years of related experience is required. • 8+ years of experience in IT software development. • Strong knowledge of Spring Boot microservices. • Hands-on experience with Java 21 and Java 25. • Excellent communication skills. • Must be a US Citizen or have Permanent Residence status (Green Card). • Must be able to obtain a Position of Public Trust Clearance. • Must be able to pass a drug screening, criminal history, and credit checks. • Must have lived in the United States for the past 5 years. • Cannot have more than 6 months travel outside the United States within the last five years. Military Service excluded. (Exception does not include military family members.).