Java Software Engineer

hackajob on-demand focuses on matching talented contractors like you with organisations seeking specific skills for their projects. We use our platform to connect you with exciting contract opportunities and discuss projects on behalf of the companies we partner with.Job Title: Sr. Backend Java DeveloperLocation: McLean, VA - onsite - 5 days/weekDescription:They're looking for a Senior Backend Developer to join an Agile team responsible for a mission-critical web platform. You'll work on stabilizing and enhancing existing systems while driving modernization using Java and AWS. This role suits a pragmatic, hands-on engineer who enjoys owning backend systems end-to-end and shaping technical direction in a regulated environment.What You'll DoDesign, build, and maintain backend services using Java and Spring BootDevelop and evolve microservices and REST APIsModernize legacy backend components while ensuring system stabilityDesign and optimize PostgreSQL schemas and queries. Integrate services with AWS (Lambda, S3, API Gateway, SQS, EventBridge, etc.)Apply event-driven and cloud-native patterns to improve scalability and resilienceWrite unit and integration tests and participate in code reviewsSupport production systems, debugging issues, and improving observabilityCollaborate closely with Product, Frontend, QA, and DevOps teams in an Agile environmentWhat We're Looking ForStrong experience with Java and Spring BootSolid understanding of backend architecture, microservices, and design patternsHands-on experience with AWS services Strong SQL skills and experience with PostgreSQLExperience working with legacy systems and incremental modernizationFamiliarity with CI/CD pipelines and containerized deploymentsFinancial Services or Wealth Management experience is a plusOwnership mindset and strong problem-solving skillsTechnology Stack Languages & Frameworks: Java 23, Spring Boot 3.x Architecture: Microservices, REST APIs, event-driven systems Database: PostgreSQL Cloud: AWS DevOps: Git, Gradle, Docker, CI/CD Observability: New Relic, Elasticsearch Productivity: GitHub Copilot