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Open Systems Technologies
Open Systems Technologies

60 Open Systems Technologies Senior Software Developer Jobs Hiring Near You

Open Systems Technologies

DevOps Engineer

Chantilly, VA

$54 - $74/hr

Open Systems Technologies is looking for a Mid-to-Senior Cloud/DevOps Software Engineer to join our dynamic development team in supporting a Government customer. The engineer will be working with a ...

Open Systems Technologies Corporation

Senior

Fort Belvoir, VA · On-site

$62.50 - $80.50/hr

Open Systems Technologies Corporation is a leader in the government contracting marketplace ... software development, scientific and engineering technical assistance, systems integration and ...

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Open Systems Technologies Jobs Information

What are the key skills and qualifications needed to thrive as a Senior Software Developer, and why are they important?

To thrive as a Senior Software Developer, you need deep expertise in programming languages, software architecture, and problem-solving, typically backed by a bachelor’s degree in computer science or a related field. Proficiency with development frameworks, version control systems like Git, and cloud platforms such as AWS or Azure is standard, and certifications in these areas can be beneficial. Leadership, strong communication, and mentoring abilities set standout candidates apart in this role. These skills ensure that complex projects are delivered efficiently, code quality is maintained, and junior team members are effectively guided for overall team success.

What kinds of projects and responsibilities can a Senior Software Developer expect to handle on a daily basis?

As a Senior Software Developer, you’ll typically be responsible for leading complex development projects, designing technical solutions, and mentoring junior team members. Daily tasks often include writing and reviewing code, participating in architecture discussions, collaborating with cross-functional teams (such as QA, product management, and DevOps), and troubleshooting high-level technical issues. You may also be involved in setting coding standards, conducting code reviews, and helping to plan sprints or project roadmaps.

What are Senior Software Developers?

Senior Software Developers are experienced professionals who design, develop, and maintain complex software applications. They often lead development teams, mentor junior developers, and make critical architectural decisions. Their responsibilities include writing high-quality code, troubleshooting technical issues, and ensuring that software projects meet performance and security standards. With deep expertise in programming languages and software engineering principles, they play a key role in delivering successful technology solutions for organizations.

What is the difference between Senior Software Developer vs Software Engineer?

AspectSenior Software DeveloperSoftware Engineer
CredentialsBachelor's degree in CS or related field; experience often 5+ yearsBachelor's or higher in CS or related field; similar experience levels
Work EnvironmentCollaborates on complex projects, mentors juniors, leads technical effortsDesigns, develops, tests software; may work on specific modules or systems
Industry UsageCommonly used in tech companies, startups, and enterprise firmsWidely used across industries, often interchangeable with developer roles

The main difference is that Senior Software Developers typically have more experience, leadership responsibilities, and focus on complex project oversight, while Software Engineers may focus more on designing and implementing software solutions. Both roles require similar credentials and are integral in software development teams, but Senior Software Developers often take on mentorship and strategic tasks.

What is it like to work at Open Systems Technologies?

Open Systems Technologies appears to be a collaborative and innovative company that prioritizes teamwork and customer satisfaction. The company's mission-driven approach is reflected in its structured team environment, where employees work together to deliver cutting-edge solutions and services to clients across various industries. Working at Open Systems Technologies may appeal to candidates who value a dynamic work environment, opportunities for professional growth, and the chance to contribute to meaningful projects that drive business success.
What other companies are hiring for Senior Software Developer jobs?
What are the most popular jobs at Open Systems Technologies?
What are the most popular categories at Open Systems Technologies?
Infographic showing various Senior Software Developer job openings at Open Systems Technologies in the United States as of May 2026, with employment types broken down into 89% Full Time, and 11% Contract. Highlights an 97% Physical, and 3% Remote job distribution.
Java/J2EE Software Engineer

Java/J2EE Software Engineer

Open Systems Technologies Corporation

Herndon, VA • On-site

$53.25 - $73/hr

Full-time

Medical, Dental, Life, Retirement, PTO

Posted yesterday

Job description

Open Systems Technologies Corporation is a leader in the government contracting marketplace, providing Enterprise Security and Cloud Computing solutions to support large organizations. Our capabilities include supplying federal government entities and private businesses with software development, scientific and engineering technical assistance, systems integration, and enterprise security. Since its founding in 1996, OST has been committed to delivering high-quality, best-in-class results that bring added value to our clients while investing in our employees' futures by providing exciting projects to work on, and robust benefits to include technical training and certifications, relocation assistance and a 401K match with immediate vesting.
Open Systems Technologies is seeking a Back-End Software Engineer to support a large government-end client.
Required Qualifications:
  • CLEARANCE: Active TS/SCI w/CI Poly
  • A software developer with experience in Java development utilizing various libraries such as SpringBoot, Mockito, Lombok, OpenAPI (Swagger) and other similar libraries developing RESTFul services. The software application is managed through Git and built using gradle. Other third-party applications that are utilized is Kafka, MongoDB, ActiveMQ and/or NiFi. Applications are containerized and deployed to a Kubernetes cluster using Helm Charts. Experience with Amazon Web Services (AWS) is also desired.
  • Experience with Java/J2EE object-oriented programming language
  • Experience with Spring Boot or Spring Framework
  • Experience in working with microservices and containerization technologies, including Docker, Bitbucket, Kubernetes, or OpenShift
  • Experience with integration and development tools, including AWS, Docker, Bitbucket, Jenkins
  • Experience with supporting systems engineering efforts in system design, solution engineering, and software development
  • Experience with Linux OS and command line interface

Software Engineer, Mid
Area of Focus Skills - Software Engineer job family aligned skills plus: Java, JavaScript, Git, SQL, Python, Server Side Development, Server Side Software, Middleware, Integration, API Development, Operating Systems, Core Application Systems, Data Integration, Application Integrations, Docker, Node.js, Groovy, Perl Programming, Scala, Spring Cloud, Spring Core, Spring-Boot, Spring Data
You Have:
  • 2+ years of experience with Java
  • 1+ years of experience in working with microservices and containerization technologies, including Docker and Kubernetes
  • Experience with backend frameworks, such as Spring Framework or Spring Boot
  • Experience with API development, including REST architectural style
  • Experience with Linux OS and Command Line Interface
  • Top Secret clearance
  • HS diploma or GED
  • Ability to obtain a DoD 8570 certification, including Security+ or CISSP, within 6 months of start date

Nice If You Have:
  • Experience with network security, including access and authorization for PKI and chain trusting
  • Experience with writing unit tests and E2E testing
  • Knowledge of Apache NiFi and Kafka
  • Knowledge of JIRA, Confluence, Git, and GitLab
  • Ability to investigate root causes and provide corrective actions
  • TS/SCI clearance with a CI Polygraph
  • DoD 8570 certification, including Security+ or CISSP

Software Engineer, Senior
Area of Focus Skills - Software Engineer job family aligned skills plus: Java, JavaScript, Git, SQL, Python, Server Side Development, Server Side Software, Middleware, Integration, API Development, Operating Systems, Core Application Systems, Data Integration, Application Integrations, Docker, Node.js, Groovy, Perl Programming, Scala, Spring Cloud, Spring Core, Spring-Boot, Spring Data
You Have:
  • 5+ years of experience with Java
  • 3+ years of experience in working with microservices and containerization technologies, including Docker and Kubernetes
  • Experience with backend frameworks, such as Spring Framework or Spring Boot
  • Experience with API development, including REST architectural style
  • Experience with integration and development tools, including AWS, Bitbucket, or Jenkins
  • Experience with supporting systems engineering efforts in system design, solution engineering, and software development
  • Experience with Linux OS and Command Line Interface
  • Top Secret clearance
  • HS diploma or GED
  • Ability to obtain a DoD 8570 Compliant Certification, including Security+ or CISSP, within 6 months of start date

Nice If You Have:
  • Experience with Open Systems Architecture design principles
  • Experience with DevOps technologies
  • Experience with CI/CD technologies, including Ansible, Jenkins, and GIT
  • Experience with Agile development or Scrum
  • Knowledge of non-relational databases, including MongoDB
  • Knowledge of Apache NiFi and Kafka
  • Ability to work in a fast-paced and collaborative team environment
  • Possession of excellent verbal and written communication skills
  • TS/SCI clearance with a CI Polygraph
  • Security+ CE, SSCP, CCNA-Security, or GSEC Certification

BENEFITS
OST is an Equal Opportunity Employer and has been operating since 1996 providing support on various contracts with Government agencies. We offer a comprehensive benefits package that includes 3 weeks paid time off, 11 Federal Holidays, medical/dental coverage, STD, LTD, Life Insurance, AD&D, 401k with up to 4% match, and end-of-year profit sharing.

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