Java React Developer
Java React Developer W2 Role Onsite Role F2F interview in CA LocaL Candidate only Walnut Creek, CA (Hybrid) Long term contract In-person interview with client Mandatory skills:-8+ years professional software engineering experience; 2+ years in a lead / staff / tech-lead capacity Minimum of 3-4 years of hands-on React experience is mandatory. AI agent building experience (plus): Tool-calling agents, MCP, or workflow automation agents applied to enterprise systems About the role We are hiring a Lead Software Engineer to own technical direction for a large multi-module Java enterprise platform with a modern React UI, batch processing, partner integrations, and AWS-hosted containerized deployments. You will lead design and delivery across a mature codebase while modernizing architecture, cloud operations, and developer experience. Experience building AI agents / LLM-powered workflows is a strong plus.
Required qualifications:
- Deep expertise in Java (Java 8+; comfort with large enterprise codebases)
- Strong hands-on experience with Spring (MVC, Security, Batch, SOAP/REST), Hibernate/JPA, and relational data modeling
- Solid SQL / MySQL skills: schema design, query tuning, transactional integrity
- Experience with Maven, multi-module builds, and Tomcat (or similar Java app servers)
- Proven AWS experience in production: ideally ECS/Fargate, ECR, ALB, Secrets Manager / SSM, S3, CloudWatch, and IaC (CDK, CloudFormation, or Terraform)
- Experience modernizing or maintaining legacy enterprise systems while delivering incremental improvements safely
- Strong design, debugging, and communication skills; ability to lead without blocking the team