Sr Java Developer

Optimal Solutions & Technologies (OST, Inc.) is focused on excellence. We specialize in providing Management Consulting, Information Technology, and Research Development and Engineering services. 

The fundamental distinction of the OST team is its business knowledge in both the public and private sectors. We serve the aerospace & transportation, association & nonprofit, defense, education, energy, financial, healthcare, and technology & telecommunications industries. OST is successful because we listen to our clients, we learn from our clients, and we know our clients.

Java Developer

Description of specific duties in a typical workday for this position:

OST is seeking a Java Full Stack Developer to support software modernization initiatives for U.S. Citizenship and Immigration Services (USCIS). The developer will build, enhance, and maintain secure enterprise applications supporting mission-critical immigration and benefits-processing systems.

• Develop and maintain Java-based enterprise applications.


• Build backend services and RESTful APIs using Java and Spring Boot.


• Develop user interfaces using JavaScript or TypeScript frameworks such as React or Angular.


• Support legacy-system modernization and cloud-based application development.


• Write and maintain automated unit and integration tests.


• Participate in Agile development activities, code reviews, and technical-design discussions.


• Support CI/CD pipelines and DevSecOps practices.


• Troubleshoot application and production issues.


• Collaborate with government personnel and other technical teams.

Requirements (Years of experience, Education, Certifications):

• Bachelor’s degree in Computer Science, Information Technology, or a related field.


• Five or more years of software development experience.


• Strong experience with Java, Spring, or Spring Boot.


• Experience developing RESTful APIs and microservices.


• Experience with React, Angular, or another modern front-end framework.


• Experience with SQL and relational databases.


• Familiarity with automated testing, Git, Agile, and CI/CD practices.


• Strong communication and problem-solving skills.


• S. citizenship and ability to meet USCIS suitability requirements.

Nice to Have (skills that are not required, but nice to have):

• Previous USCIS, DHS, or federal government experience.


• Experience with AWS, Docker, Kubernetes, or OpenShift.


• Experience modernizing legacy enterprise applications.


• Familiarity with USCIS systems such as ELIS, Global, CLAIMS3, or Benefits Hub.

This is a full-time position paying a base salary, full benefits, and has possible bonus potential based on merit and performance. To be considered for this position, please apply online with a resume.

OST is an equal opportunity employer. Applicants are considered for positions without regard to race, religion, gender, native origin, age, disability, or any other category protected by applicable federal, state, or local laws.