Senior Java Developer: MongoDB & AI (RooCode/Claude) onsite

US staffing Inc; Sunnyvale (CA); On-site; USD 150,000 - 190,000; Full time

Job summary

US staffing Inc is seeking a highly experienced Java Developer to join a fast paced, on-site team in Sunnyvale, CA (and Austin, TX). The role emphasizes enterprise Java, MongoDB, and hands-on use of AI tools RooCode and Claude to build scalable services.

Candidates should have 10+ years in Java, 5+ years with Mongo, and strong problem-solving skills. You will work across a multi-tier web application stack, AWS, REST/JSON, and NoSQL databases, delivering robust, low-latency APIs.

Qualifications

• 10+ years of enterprise Java development.
• Strong CS fundamentals (data structures, algorithms).
• Hands-on experience with AWS and RESTful services.
• Experience with NoSQL databases (MongoDB).
• Familiarity with AI tools RooCode and Claude is a plus.

Skills

Java

AWS

Communication

Problem solving

NoSQL

Tools

Spring Framework

Spring Data

Spring Boot

REST API

Hibernate/JPA

JUnit/TestNG

Oracle

MongoDB

Job description

US staffing Inc is seeking a highly experienced Java Developer to join a fast paced, on-site team in Sunnyvale, CA (and Austin, TX). The role emphasizes enterprise Java, MongoDB, and hands-on use of AI tools RooCode and Claude to build scalable services.

Candidates should have 10+ years in Java, 5+ years with Mongo, and strong problem-solving skills. You will work across a multi-tier web application stack, AWS, REST/JSON, and NoSQL databases, delivering robust, low-latency APIs.