Job 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.