Senior Software Engineer - Mission-Critical Systems (TS/SCI)

Parsons; Reston (VA); On-site; USD 177,000 - 332,000; Full time

Benefits offered by this job

Medical

Dental

Vision

PTO

ESOP

401(k)

Life Insurance

Flexible schedules

Holidays

Job summary

Parsons is seeking highly skilled Software Developers to design, develop, and support mission-critical information systems. You will work on production services in Java and C/C++, author interface docs, and support integration testing while collaborating with Network Ops, Infrastructure, and Field Engineering teams.

The role requires 7+ years of software development experience (Masters/PhD adds extra years), proficiency in Java/Scala/C/C++, and experience with PostgreSQL or MongoDB.

Qualifications

• Bachelor's degree and 7+ years of Software Engineering experience.
• Masters/PhD counted as 2 additional years of experience each.
• Strong proficiency in Java, Scala and/or C/C++ with production-grade development experience.
• Experience building and supporting distributed, high-availability systems.
• Working knowledge of relational databases (PostgreSQL preferred) and/or NoSQL databases (MongoDB preferred).
• Experience with CI/CD pipelines (GitLab CI/CD strongly preferred) and modern development workflows.
• Ability to troubleshoot production issues using logs, metrics, and structured debugging approaches.
• Strong written communication skills.
• Active TS/SCI required.
• Domestic and/or international project travel may be required.

Responsibilities

• Design, develop, and support mission-critical information systems.
• Develop, enhance, and sustain production services in Java and C/C++.
• Author and maintain interface documentation and support integration testing.
• Participate in on-call rotation or operational support escalations.
• Collaborate with Network Ops, Infrastructure, and Field Engineering teams.
• Develop and maintain build/deployment automation using GitLab CI/CD.
• Write unit, integration, and regression tests for critical services.
• Follow configuration management and change control for distributed systems.
• Troubleshoot and correct software discrepancies to maximize availability.

Skills

Java/Scala/C++

Distributed systems

PostgreSQL

MongoDB

GitLab CI/CD

Testing (unit/integration)

Troubleshooting logs/metrics

Technical writing

TS/SCI clearance

Travel (domestic/international)

Education

Bachelor's degree

Masters/PhD count as extra experience

Tools

GitLab CI/CD

PostgreSQL

MongoDB

Job description

Parsons is seeking highly skilled Software Developers to design, develop, and support mission-critical information systems. You will work on production services in Java and C/C++, author interface docs, and support integration testing while collaborating with Network Ops, Infrastructure, and Field Engineering teams.

The role requires 7+ years of software development experience (Masters/PhD adds extra years), proficiency in Java/Scala/C/C++, and experience with PostgreSQL or MongoDB.