Senior Java Developer (Spring Boot) (Onsite - Pleasanton, CA) (Pleasanton, CA, 94566) | 09/04/26

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Share Job Job Description Senior Java Developer (Spring Boot) (Onsite - Pleasanton, CA) We are seeking an experienced Senior Java Developer with deep expertise in Java, Spring Boot, and database technologies to join our engineering team. You will play a key role in designing, developing, and maintaining scalable, high-performance applications, while mentoring junior developers and driving technical best practices across the team. This is a 40-hour per week, 6-month contract (possible extension), an onsite role at client's office in Pleasanton, CA. This is a W2 role as a Stage 4 Solutions employee. Health benefits and a 401K are offered.

Responsibilities:

• Design, develop, and maintain robust, scalable, and high-performance backend applications using Java and Spring Boot.
  
• Architect microservices-based solutions and contribute to system design discussions.
  
• Write clean, efficient, and well-documented code following industry best practices.
  
• Design and optimize database schemas, queries, and stored procedures for performance and scalability.
  
• Collaborate with cross-functional teams including product managers, QA, DevOps, and frontend developers.
  
• Conduct code reviews and provide constructive feedback to team members.
  
• Troubleshoot, debug, and resolve complex production issues.
  
• Mentor junior and mid-level developers, fostering technical growth within the team.
  
• Participate in architectural decisions and contribute to technical roadmaps.
  
• Ensure application security, scalability, and reliability standards are met.
  
• Stay current with emerging technologies and recommend improvements to existing systems.
  
• Contribute to CI/CD pipeline improvements and DevOps practices.

Requirements:

• 10+ years of professional Java development experience, with experience in retail environments.
  
• Strong hands-on experience with Spring Boot, Spring Framework (Spring MVC, Spring Data, Spring Security)
  
• Proven experience designing and building microservices architecture
  
• Strong expertise in relational databases (e.g., MySQL, PostgreSQL, Oracle) — schema design, query optimization, indexing
  
• Experience with NoSQL databases (e.g., MongoDB, Redis, Cassandra) is a plus
  
• Solid understanding of RESTful API design and development
  
• Experience with ORM frameworks (Hibernate/JPA)
  
• Proficiency in build tools (Maven/Gradle) and version control (Git)
  
• Experience with unit testing frameworks (JUnit, Mockito) and TDD practices
  
• Familiarity with containerization and orchestration (Docker, Kubernetes)
  
• Experience with message queuing systems (Kafka, RabbitMQ, or similar) is a plus
  
• Understanding of cloud platforms (AWS, Azure, or GCP)
  
• Strong knowledge of design patterns, SOLID principles, and clean code practices
  
• Experience with CI/CD tools (Jenkins, GitLab CI, or similar)
  
• Excellent problem-solving, analytical, and communication skills
  
• Bachelor's or Master's degree in Computer Science, Engineering, or related field (or equivalent practical experience).

Preferred Qualifications:

• Experience with event-driven architecture
  
• Exposure to Agile/Scrum methodologies
  
• Prior experience in a technical leadership or mentorship role
  
• Knowledge of performance tuning and application monitoring tools (e.g., New Relic, Datadog, Splunk)
  
• Experience working in a fast-paced, cross-functional product environment.