Senior Software / Systems Engineer – Defence
SUBMIT RESUME FOR THIS ROLEConfidential Employer · U.S. National Security / Defence / Mission Software
Location: Dallas, TX · Secure Program Environment
Full-time · $210,000+ USD annually
Reference: SW 20148 · 12+ years experience
Lead complex software and systems engineering changes across mission-critical secure platforms, including cryptographic services, key management, cloud-native infrastructure and broader DoD productization.
Read role description
Key responsibilities
- Lead major software and systems changes across clients, portals, proxy services and secure key-management platforms; remove customer-specific dependencies and abstract environment-specific configurations for scalable deployment.
- Design secure interfaces supporting authorization and key-management workflows; contribute to encryption libraries, cryptographic services, REST APIs and OpenBao-based or comparable secrets-management solutions.
- Provide technical leadership across Agile engineering execution, architecture, troubleshooting, cloud/container platforms and distributed teams using technologies such as Java or C/C++, Python/Go/Rust, Docker and Kubernetes.
Required qualifications
- 12+ years of professional software engineering, systems engineering or closely related experience supporting complex or mission-critical systems.
- Bachelor’s degree in Computer Science or a related technical discipline, or substantial equivalent directly relevant professional experience where permitted by the employer.
- Active TS/SCI security clearance with Polygraph is required at time of application, together with strong customer communication and the ability to lead independently across matrixed teams.
Preferred technical experience
8+ years Java on Linux/Windows or equivalent C/C++ depth; additional Python, Go or Rust experience; 5+ years cryptographic/key-management and REST API experience; 5+ years Docker/Kubernetes; cloud platform experience; secure architecture and modern Agile development practices are highly desirable.
Compensation, benefits & security clearance
Starting compensation: $210,000+ USD annually. Active TS/SCI security clearance with Polygraph is required. Comprehensive benefits include medical, dental and vision coverage, generous PTO, 401(k), HSA/FSA options, life and disability insurance, tuition reimbursement, professional training, fitness reimbursement and additional employee programs.
Confidential U.S. national-security opportunity represented by 4T North. Employer, customer and program details are disclosed to qualified candidates as appropriate.
Full Stack Developer – National Security Systems
SUBMIT RESUME FOR THIS ROLEConfidential Employer · National Security / Software Engineering / Cloud Technology
Location: Los Angeles, CA
Full-time · $115,000+ USD annually
Reference: SW 20149 · Full Stack Development
Design and deliver modern full-stack applications for U.S. national-security programs, spanning Angular front ends, backend services, data platforms and cloud-first agile delivery.
Read role description
Key responsibilities
- Develop end-to-end application features across user experience, frontend interfaces, backend services and supporting data layers using modern web technologies and secure software-engineering practices.
- Rapidly prototype and evaluate new technical approaches, applying cloud-first and agile development methods to move promising solutions toward production.
- Collaborate with IT Architects, Developers, UI/UX Designers, functional specialists and customer stakeholders to translate program requirements into scalable, maintainable software capabilities.
Required qualifications
- Bachelor’s degree in Computer Science, Software Engineering, Information Technology or a related discipline, or 2+ years of directly relevant software-engineering experience in lieu of a degree.
- Professional experience with Angular and one or more of HTML, CSS, JavaScript, Java, C# or C++.
- Active Top Secret federal security clearance is required. Candidates must be willing and eligible to obtain SCI access with a Polygraph.
Helpful additional experience
Linux development and distributed systems experience.
Compensation and eligibility
No salary, benefits or clearance level is assigned to this fictional role. For a genuine vacancy, the employer would confirm compensation, work authorization, any security screening, travel and work-location requirements.
Confidential U.S. national-security technology opportunity represented by 4T North. Employer and program details are disclosed to qualified candidates as appropriate.
Senior Software Developer – Secret
SUBMIT RESUME FOR THIS ROLEConfidential Employer · U.S. Defence Technology / Unmanned Systems / Mission Software
Location: Austin, TX
Full-time · $120,000+ USD annually
Reference: SW 20150 · 8+ years experience
Lead software verification, automated testing and systems integration across mission-critical unmanned and autonomous platforms in classified U.S. defence environments.
Read role description
Key responsibilities
- Develop and execute test plans, procedures and automated frameworks for software-hardware integration, interfaces, sensor data, autonomy modules and end-to-end mission-system verification.
- Perform exploratory, functional, regression and system-level testing in integration labs and HWIL environments; lead defect triage, root-cause analysis, requirements traceability and MOSA/interoperability verification.
- Integrate automated tests into CI/CD and DevSecOps pipelines using Python, GitLab CI/Jenkins, Docker and Kubernetes; support qualification testing, field demonstrations and operational assessments for USSOCOM unmanned platforms.
Required qualifications
- 8+ years of hands-on experience as an SDET, Software Test Engineer, Software Engineer or closely related role, with strong manual testing and test-automation capability in complex software-hardware environments.
- Bachelor’s degree in Computer Science, Software Engineering, Systems Engineering, Electrical Engineering or a related technical field, with proficiency in Python or similar scripting and frameworks such as Selenium, PyTest, Robot Framework, Cucumber, Playwright or Cypress.
- U.S. citizenship and an active Secret clearance are required; candidates must be willing and able to obtain and maintain TS/SCI access. Travel of approximately 25–50% is required.
Preferred defence & technical experience
DoD or USSOCOM programs, unmanned systems, autonomy, AI/ML, MOSA architectures, HWIL, sensor test beds, classified workflows and cross-domain solutions are highly desirable. Relevant ISTQB or Agile testing credentials are assets.
Compensation, clearance & work environment
Starting compensation: $120,000+ USD annually. Full-time position based in Tampa, Florida. Active Secret clearance and U.S. citizenship are required, with eligibility to obtain and maintain TS/SCI access. The role supports classified development environments and includes approximately 25–50% travel.
Confidential U.S. defence-technology opportunity represented by 4T North. Employer, customer and program details are disclosed to qualified candidates as appropriate.
Software Engineer – Entry Level | Space Systems
SUBMIT RESUME FOR THIS ROLEConfidential Employer · Space Systems / Aerospace Software / Autonomous Systems
Location: San Jose, CA
Full-time · Hybrid · $140,000+ USD annually
Reference: SW 20151 · Entry Level / Early Career
Develop mission-critical software across satellite flight systems, test infrastructure, simulations, cloud services, data pipelines and advanced algorithms supporting the build, launch and operation of spacecraft constellations.
Read role description
Key responsibilities
- Own new software capabilities operating on the ground, in test environments or aboard spacecraft; design, implement and maintain reliable software components across complex mission systems.
- Develop automated tests, monitoring and technical analysis to validate correctness, support integration and verification, and troubleshoot multidisciplinary software, hardware and spacecraft interfaces.
- Collaborate across software, systems, hardware and mission teams while rapidly learning new technologies and contributing to design reviews, technical decisions and continuous improvement.
Required qualifications
- Bachelor’s degree in Computer Science, Aerospace Engineering, Computational Mathematics, Computer Engineering or a closely related technical discipline.
- Strong proficiency in C++, Python, TypeScript or a comparable high-level language, with academic or practical experience in algorithms, data structures, operating systems, physics and statistics.
- Strong analytical problem-solving, technical communication and rapid-learning capability, with the ability to take ownership of assigned work in a fast-paced engineering environment.
Preferred technical & space-systems experience
Embedded software, network protocols, hardware/software integration, FPGA/GPU programming, satellites, robotics or autonomous systems are strong assets. Orbital mechanics, mathematical optimization, machine learning, signal processing, cloud/distributed systems and technical project-team experience are also highly desirable.
Compensation, work environment & export-control eligibility
Starting compensation: $140,000+ USD annually. Full-time hybrid position based in San Jose, California, requiring on-site work approximately three days per week. The role involves access to U.S. export-controlled technical information; candidates must be a U.S. person as defined under applicable regulations, otherwise authorized to access the information, or eligible and reasonably likely to obtain the required U.S. government export authorization.
Confidential U.S. space-technology opportunity represented by 4T North. Employer and program details are disclosed to qualified candidates as appropriate.