Senior software engineer Jobs in Downey, CA

Description

TEKsystems is seeking an Intermediate to Senior Software Engineer to support a high-impact national security program focused on ground-based mission systems that play a critical role in missile tracking, space domain awareness, and the protection of our nation's strategic interests. This is your opportunity to contribute to technology that matters — systems that operate at the intersection of innovation and national defense, supporting real-time mission operations that have a direct impact on global security.

You will be embedded within a large, highly specialized Software Engineering team organized across multiple subsystems, each with a distinct technical focus. The team operates across both active development and Operations & Maintenance (O&M) efforts, building and sustaining mission-critical software product lines while developing new capabilities in close coordination with a classified government customer. This is not a back-office role — the work you do here directly supports warfighters and intelligence professionals who depend on these systems every day.

This position is 100% on-site in a Sensitive Compartmented Information Facility (SCIF) in Redondo Beach, CA.

What You'll Do

• Develop and deliver new software capabilities as a C++ engineer in a fast-paced agile environment running on Red Hat Enterprise Linux (RHEL)
• Design, code, and unit test software solutions aligned to Mathematical Algorithm Requirements (MARs)
• Identify, troubleshoot, and resolve software discrepancies to keep mission systems running at peak performance
• Collaborate with subject matter experts and Senior engineers across multiple specialized software subsystems

What You Bring

• Strong C++ development experience — this is the core requirement
• Familiarity with Red Hat Enterprise Linux (RHEL) environments
• Experience working in agile development teams
• Active TS/SCI clearance — this is non-negotiable and required on day one
• Bachelor's degree with 2+ years of relevant experience, Master's degree with 0+ years, or 4+ additional years of experience in lieu of degree

Why This Role

You'll be working on revolutionary systems with a team of highly skilled engineers who are passionate about what they build and why they build it. The mission is real, the technology is cutting edge, and the impact is generational. If you're a cleared software engineer looking for work that goes beyond the ordinary, this is it.

Clearance Required: TS/SCI

Location: Redondo Beach, CA (100% On-Site | SCIF)

Experience Level: Intermediate to Senior

Job Type & Location

This is a Contract to Hire position based out of Los Angeles, CA.

Pay and Benefits

The pay range for this position is $ - $

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
• Medical, dental & vision
• Critical Illness, Accident, and Hospital
• 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available
• Life Insurance (Voluntary Life & AD&D for the employee and dependents)
• Short and long-term disability
• Health Spending Account (HSA)
• Transportation benefits
• Employee Assistance Program
• Time Off/Leave (PTO, Vacation or Sick Leave)

Workplace Type

This is a fully onsite position in Los Angeles,CA.

Application Deadline

This position is anticipated to close on May 13, 2026.

h4>About TEKsystems:

We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

About TEKsystems and TEKsystems Global Services

We’re a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We’re a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We’re strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We’re building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.