Onward Search is seeking a mid to senior-level Full Stack Engineer for a contract-to-hire position in Burlington, Massachusetts. The ideal candidate will possess extensive experience in Java (Spring Boot, Core Java), Node.js (Express, Nest), Angular 10+, REST API development, and cloud infrastructure (GKE/AWS). Responsibilities include building, testing, and deploying applications, working with SQL/NoSQL databases, and utilizing CI/CD tools. A strong understanding of automation technologies (Maven, Gradle, Jenkins) and experience with Kubernetes and Argo CD are essential. This role requires excellent communication and collaboration skills, along with a growth mindset and a focus on execution and delivery.