Back End Developer

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.

We’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 Do

• Design, build, and maintain backend services using Java and Spring Boot
• Develop and evolve microservices and REST APIs
• Modernize legacy backend components while ensuring system stability
• Design 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 resilience
• Write unit and integration tests and participate in code reviews
• Support production systems, debugging issues and improving observability
• Collaborate closely with Product, Frontend, QA, and DevOps teams in an Agile environment

What We’re Looking For

• Strong experience with Java and Spring Boot
• Solid understanding of backend architecture, microservices, and design patterns
• Hands-on experience with AWS services
• Strong SQL skills and experience with PostgreSQL
• Experience working with legacy systems and incremental modernization
• Familiarity with CI/CD pipelines and containerized deployments
• Financial Services or Wealth Management experience is a plus
• Ownership mindset and strong problem-solving skills

Technology 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