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Opt Java Developer Jobs in California (NOW HIRING)

Sonsoft Inc

Java Developer with NoSQL

Sunnyvale, CA

$59.75 - $77.50/hr

Hands on experience on Mongo, Elastic Search and related technologies Proficient in Java ... No OPT-EAD & H1-B for this position. * Please mention your Visa Status in your email or resume

Sonsoft Inc

Java Developer (GC--USC)

Sunnyvale, CA · On-site

$59.75 - $77.50/hr

... programming using Java/J2EE Technologies. At least 4 years of experience in Java/J2EE, Spring Boot ... No OPT-EAD & H1B Consultants please. * Please mention your Visa Status in your email or resume

Sonsoft Inc

Java Developer

Long Beach, CA

$53.50 - $69.50/hr

Experience working with DevOps & Continuous Integration tools. Experience working in agile ... No OPT-EAD & H1-B for this position. * Please mention your Visa Status in your email or resume

Sonsoft Inc

Java Developer (GC--USC)

Sunnyvale, CA

$59.75 - $77.50/hr

At least 3 years of experience in Core Java, Design Patterns, Restful WS, Spring/Struts, Hibernate ... No OPT-EAD & H1B Consultants please. * Please mention your Visa Status in your email or resume

Sonsoft Inc

Mongo DB with Java Developer

Sunnyvale, CA · On-site

$59.75 - $77.50/hr

At least 4 years of experience in developing using J2EE technologies including Java, Spring ... OPT-EAD consultants desired to work for full-time can also apply. * No H1B Consultants please.

Sonsoft Inc

Java Developer with Mongo DB

Sunnyvale, CA · On-site

$59.75 - $77.50/hr

At least 4 years of experience in developing using J2EE technologies including Java, Spring ... No OPT-EAD & H1B Consultants please. * Please mention your Visa Status in your email or resume

Sonsoft Inc

Java Developer AWS

Agoura Hills, CA

$54.50 - $70.50/hr

Must have strong programming skills using core JAVA. * Must be experienced with Web technologies ... No OPT-EAD, H1B & TN candidates please. Please mention your Visa Status in your email or resume

Sonsoft Inc

Java/J2EE Developer

Foster City, CA

$59.50 - $77/hr

At least 4 years of experience in Java J2EE technologies Skills.. * At least 4 years of experience ... No OPT-EAD & H1B Consultants please. * Please mention your Visa Status in your email or resume

Sonsoft Inc

Java/J2EE Developer

Foster City, CA

$59.50 - $77/hr

At least 4 years of experience in Java J2EE technologies Skills * At least 4 years of experience in ... No OPT-EAD and H1B for this position. * Please mention your email id in your emai l or resume

USM

JAVA SOA Developer

Orange, CA

$54.50 - $70.50/hr

OPT EAD, GC EAD, GC, TN and Citizens Only Hi Friends, Hope you are doing great, I have an urgent ... JAVA SOA Developer Location: Lake Forest, CA Duration: 6-12 Months Top Three Skills: SOA Java ...

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All JobsOpt Java Developer JobsOpt Java Developer Jobs in California

Opt Java Developer information

What are Opt Java Developers?

OPT Java Developers are recent graduates, typically international students in the United States, who work as Java Developers while on Optional Practical Training (OPT) status. They have recently completed a degree in a related field and are authorized to gain hands-on experience in their area of study. OPT Java Developers are proficient in Java programming and use their skills to develop software applications, maintain code, and contribute to technology projects. Employers often hire OPT Java Developers to fill entry-level roles and benefit from their up-to-date knowledge of programming technologies.

What is the difference between Opt Java Developer vs Java Developer?

AspectOpt Java DeveloperJava Developer
Required CredentialsBachelor's in CS or related, Java certifications often preferredBachelor's in CS or related, Java certifications often preferred
Work EnvironmentSoftware development teams, IT companies, tech startupsSoftware development teams, IT companies, tech startups
Employer & Industry UsageUsed across various industries including finance, healthcare, and techCommonly employed in similar industries, often with more senior roles
Search & Comparison IntentPeople comparing entry to mid-level Java rolesPeople exploring Java development careers or job opportunities

The Opt Java Developer and Java Developer roles share similar credentials, work environments, and industry usage. The main difference often lies in specific project focus or company terminology, but both roles are fundamental in software development teams working with Java technologies.

What are the key skills and qualifications needed to thrive as an Opt Java Developer, and why are they important?

To thrive as an Opt Java Developer, you need a solid understanding of Java programming, object-oriented design principles, and a bachelor’s degree in computer science or a related field. Familiarity with frameworks like Spring, Hibernate, and version control systems such as Git, along with knowledge of databases and build tools like Maven or Gradle, is typically required. Strong problem-solving skills, effective communication, and the ability to work collaboratively in agile teams set top candidates apart. These skills and qualifications are crucial for delivering robust, scalable applications and ensuring seamless integration within dynamic development environments.

What are some common challenges Opt Java Developers face when working on optimization projects, and how can they overcome them?

Opt Java Developers often encounter challenges such as optimizing code for performance while maintaining readability and scalability. Balancing system resource usage with application responsiveness can be complex, especially when dealing with large datasets or high-throughput systems. To overcome these obstacles, developers should leverage profiling tools to identify bottlenecks, collaborate closely with QA and DevOps teams for efficient testing and deployment, and stay updated on the latest Java performance best practices. Regular code reviews and knowledge sharing within the team also help in collectively tackling optimization issues.
What are popular job titles related to Opt Java Developer jobs in California? For Opt Java Developer jobs in California, the most frequently searched job titles are:
What job categories do people searching Opt Java Developer jobs in California look for? The top searched job categories for Opt Java Developer jobs in California are:
What cities in California are hiring for Opt Java Developer jobs? Cities in California with the most Opt Java Developer job openings:
Opt Java Developer jobs near you
Full Stack Java Developer (microservices + React)

Full Stack Java Developer (microservices + React)

QUANTUM TECHNOLOGIES LLC

Concord, CA • On-site

$70/hr

Other

Posted 5 days ago

New

Job description

Job Title: Full Stack Java Developer (microservices + React)

Location: Concord, CA

Duration: 6 Months + Extension

Bill Rate: $70/hour

Job Type: C2C/1099 Contract

Client: To Be Discussed Later

Work Authorization: US-Citizen, H-1B, OPT-EAD, GC-EAD

Role Overview

We are seeking a highly skilled Full Stack Java Developer with a strong frontend focus on React and deep expertise in Spring Boot based microservices. The ideal candidate will design, develop, and maintain scalable, highperformance web applications and RESTful services for enterprise-grade platforms, particularly within regulated or highavailability environments.

Key Responsibilities

Frontend (React Strong Focus)

  • Design and develop modern, responsive Single Page Applications (SPAs) using React (Hooks, Context API, Redux)
  • Build reusable, modular UI components using JavaScript/TypeScript, HTML5, CSS3
  • Integrate frontend applications with backend APIs using REST/JSON
  • Optimize UI performance using lazy loading, code splitting, and efficient state management
  • Collaborate with UX/UI designers to translate wireframes into high-quality user experiences

Backend (Java & Spring Boot Microservices)

  • Design and develop Spring Boot microservices following RESTful and microservices architecture principles
  • Implement business logic using Java (8/11/17+), Spring MVC, Spring Data JPA/Hibernate
  • Build secure APIs with OAuth2, JWT, and role-based access controls
  • Ensure high availability, scalability, and fault tolerance using resilient design patterns
  • Integrate with relational and NoSQL databases (PostgreSQL, Oracle, MySQL, MongoDB)

DevOps & Engineering Practices

  • Write unit and integration tests using JUnit, Mockito, Jest, Enzyme
  • Participate in CI/CD pipelines using Maven, Jenkins, GitHub/GitLab, Azure DevOps
  • Containerize and deploy services using Docker and Kubernetes (preferred)
  • Work in Agile/Scrum teams, contributing to design reviews, code reviews, and sprint ceremonies

Required Skills

  • Strong proficiency in React (v16+ / v18 preferred)
  • Solid backend development experience with Java and Spring Boot microservices
  • REST API design and integration expertise
  • Experience with SQL and ORM frameworks (JPA/Hibernate)
  • Hands-on experience with Git, build tools, and CI/CD pipelines
  • Strong problem-solving and communication skills

Nice to Have

  • Experience with Kafka or event-driven architectures
  • Cloud experience on AWS, Azure, or Google Cloud Platform
  • Exposure to Micro-frontend architecture
  • Banking, Financial Services, or other regulated domain experience


We are an equal opportunity employer. All aspects of employment including the decision to hire, promote, discipline, or discharge, will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, national origin, citizenship/ immigration status, veteran status, or any other status protected under federal, state, or local law.

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