Senior Full Stack Java Developer (AI Lab)

Job DescriptionJob DescriptionJob Title: Senior Full Stack Java Developer (AI Lab)

Location: Boston, MA (On-site). Philadelphia also considered.

Employment Type: Contract (W2 through ZipStaff — No C2C or 1099)

About the Opportunity:ZipStaff is seeking a Senior Full Stack Java Developer for an AI Lab team at a financial services organization. You will stay hands-on building Java / Spring applications and modern front ends while influencing architecture, quality, and mentoring. Work is AI- and data-enabled with Product Owners, data scientists, and business stakeholders.

What You’ll Do:Design, develop, and maintain Java applications in a distributed environment.Build end-to-end features with React or Angular and Java / Spring Boot (Python or Node.js as needed).Own features from requirements through implementation, deployment, and production support.Contribute to AI-enabled and data-driven solutions with data and product teams.Participate in design and architecture discussions; run code reviews.Mentor less experienced developers and set engineering standards.Work with CI/CD and deployment automation; support OpenShift and Azure.Troubleshoot complex production issues.Apply RAG, embeddings, vector search, and agentic frameworks (LangChain, LangGraph, CrewAI) where the product needs them.

Required Qualifications:5+ years hands-on Java development.Strong Spring (MVC, Data, Security) and enterprise backend systems.Modern front end: Angular and TypeScript (React acceptable).SQL and NoSQL, data modeling, and performance.Messaging / asynchronous processing.Hands-on Azure.Agile (Scrum / Kanban).Ability to work on-site in Boston, MA (Philadelphia considered).Must be legally authorized to work in the United States without sponsorship now or in the future.

Preferred Qualifications:OpenShift / Unix-Linux.RAG, embedding models, vector databases, semantic search.LLMs and agentic frameworks (LangChain, LangGraph, CrewAI).Python or Node.js in addition to Java.Mentoring and technical leadership on a small team.

Benefits:Health Insurance.Dental Insurance.Vision Insurance.401(k).401(k) matching.Paid time off.Referral Program.

About ZipStaff:ZipStaff partners with leading organizations to connect skilled technology professionals with high-impact contract opportunities. We focus on quality matches, clear communication, and long-term success for candidates and clients.

To apply, submit your resume highlighting Java / Spring and Angular (or React) work you owned, Azure or OpenShift delivery, and any RAG / LangChain exposure.