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International Software Systems, Inc.
Senior Java Software Engineer

Senior Java Software Engineer

On site

Towson, United states

Senior

Freelance

12-11-2025

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Skills

Java JavaScript TypeScript HTML CSS Jira PostgreSQL Databases jquery angular node.js Front-end Development Software Development Agile Spring Hibernate Spring Boot Java/J2EE Microservices Mathematics

Job Specifications

Senior Full Stack Developer (Java/Angular)

Qualifications

Bachelor’s degree in Computer Science, Engineering, Mathematics, or a related field (advanced degree may substitute for some required experience).
8+ years of hands-on software development experience, with a strong focus on designing, building, deploying, and maintaining enterprise applications.
Solid background working with a combination of Java, Spring Boot, Angular (version 9+), TypeScript, Node.js, and RESTful APIs.
8+ years of experience working in an Agile development environment.

Key Requirements:

Deep expertise in Java/J2EE and Spring Boot, with strong knowledge of Hibernate, JPA, and JDBC.
Solid understanding of object-oriented principles, Twelve-Factor App methodology, and API design patterns (REST/Web API).
Experience developing applications with relational databases such as PostgreSQL or Oracle, including schema design and performance tuning.
Strong front-end development skills: Angular 9+, TypeScript, HTML, CSS, and JavaScript (experience with libraries like JQuery or YUI is a plus).
Proven track record building microservices and RESTful APIs for enterprise systems.
Experience working on Agile teams and using common project tools (JIRA, VersionOne, or similar).

About the Company

International Software Systems, Inc. (ISSI) stands as a prominent IT services provider in Greenbelt, Maryland. Our mission is to deliver exceptional solutions to a diverse range of clients, including Federal, State, Local, and Commercial organizations. With a remarkable history spanning 28 years, ISSI has made significant strides in the industry, establishing offices in California, Florida, and Dallas and offshore facilities in Hyderabad, India, to expand our global reach. Client satisfaction is our paramount priority at IS... Know more