Senior Specialist, Software Engineering (Full Stack)

L3Harris Technologies; Colorado Springs (CO); On-site; USD 97,000 - 180,000; Full time

Benefits offered by this job

Health insurance

401(k) match

Education assistance

Paid time off

Parental leave

Job summary

L3Harris Technologies in Colorado Springs is seeking a Senior Specialist, Software Engineering (Full Stack) to lead the design and implementation of secure, scalable mission applications using Java, Python, TypeScript, and JavaScript. Join MOSSAIC Agile Portfolio Engineering and mentor others in a fast-moving defense tech program.

The role requires 6+ years of relevant experience (or equivalent) and an active Secret clearance, with travel up to 15%.

Qualifications

• Bachelor's degree and 6+ years experience, or graduate degree with 4+ years, or 10+ years without degree.
• Active Secret Security Clearance.

Responsibilities

• Lead design and implementation of full-stack software capabilities.
• Design scalable Java, Python, TypeScript, and JavaScript services.
• Define secure integration patterns and data exchanges across distributed systems.
• Guide code reviews, testing, documentation, and secure-development practices.
• Resolve complex software and integration issues across development, test, and deployment environments.
• Provide technical guidance and mentorship to software engineers while supporting sound engineering decisions.
• Coordinate technical dependencies with partner teams and contribute to delivery planning and execution.
• Travel up to 15% as needed to support program and customer requirements.

Skills

Java

Python

TypeScript

JavaScript

Full-stack

Leadership

Mentorship

Education

Bachelor's degree or higher

Tools

Kubernetes

Apache Kafka

RabbitMQ

NATS

GTK/Qt

Docker

Job description

L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do.

L3Harris is the Trusted Disruptor in defense tech. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security.

Job Title: Senior Specialist, Software Engineering (Full Stack)

Job Code: 44012

Job Location: Colorado Springs, Colorado

Job Schedule: 9/80 - Employees work 9 out of every 14 days - totaling 80 hours worked (Every Other Friday Off)

Job Description:

The Maintenance of Space Situational Awareness Integrated Capabilities (MOSSAIC) Agile Portfolio Engineering (APE) program serves the space domain awareness (SDA) customer through optical and radar sensors and associated command and control (C2) capabilities. The program is seeking a senior specialist full-stack software engineer to join its Special Projects team. You will lead technical design and implementation of secure, scalable mission applications and services using Java, Python, TypeScript, and JavaScript to support sensor integration, command-and-control workflows, and user-facing mission capabilities.

Essential Functions:

• Lead technical design and implementation of full-stack software capabilities, including backend services, application programming interfaces, and web user interfaces.
• Design scalable software using Java, Python, TypeScript, and JavaScript for service-oriented architecture and microservices-based systems.
• Define secure integration patterns, service contracts, and data exchanges across distributed systems.
• Guide code reviews, software testing, technical documentation, and secure-development practices.
• Resolve complex software and integration issues across development, test, and deployment environments.
• Provide technical guidance and mentorship to software engineers while supporting sound engineering decisions.
• Coordinate technical dependencies with partner teams and contribute to delivery planning and execution.
• Travel up to 15% as needed to support program and customer requirements.

Qualifications:

• Bachelor's Degree and minimum 6 years of prior relevant experience. Graduate Degree and a minimum of 4 years of prior related experience. In lieu of a degree, minimum of 10 years of prior related experience.
• Active Secret Security Clearance.

Preferred Additional Skills:

• Experience developing software using C/C++, Rust or Go.
• Experience developing production software using Java, Python, TypeScript, and JavaScript.
• Experience designing and integrating service-oriented architectures, asynchronous messaging patterns, and microservices-based applications.
• Experience designing application programming interfaces, service contracts, and integrations for distributed systems.
• Experience leading technical design, code reviews, automated testing, and software-delivery activities.
• Experience improving continuous integration and continuous delivery workflows for software teams
• Experience building native graphical user interfaces using GTK or Qt.
• Experience applying user interface and user experience design principles to production software.
• Experience defining technical approaches for complex full-stack applications.
• Experience deploying or supporting containerized applications in Kubernetes environments.
• Experience with event-streaming or message-bus technologies, such as Apache Kafka, RabbitMQ, ZeroMQ, or NATS.

In compliance with pay transparency requirements, the salary range for this role in Colorado state is $97,000-$180,000. This is not a guarantee of compensation or salary, as final offer amount may vary based on factors including but not limited to experience and geographic location. L3Harris also offers a variety of benefits, including health and disability insurance, 401(k) match, flexible spending accounts, EAP, education assistance, parental leave, paid time off, and company-paid holidays. The specific programs and options available to an employee may vary depending on date of hire, schedule type, and the applicability of collective bargaining agreements.

The application window for this position will close on 10/30/2026.

L3Harris Technologies is proud to be an Equal Opportunity Employer. L3Harris is committed to treating all employees and applicants for employment with respect and dignity and maintaining a workplace that is free from unlawful discrimination. All applicants will be considered for employment without regard to race, color, religion, age, national origin, ancestry, ethnicity, gender (including pregnancy, childbirth, breastfeeding or other related medical conditions), gender identity, gender expression, sexual orientation, marital status, veteran status, disability, genetic information, citizenship status, characteristic or membership in any other group protected by federal, state or local laws. L3Harris maintains a drug-free workplace and performs pre-employment substance abuse testing and background checks, where permitted by law.

Please be aware many of our positions require the ability to obtain a security clearance. Security clearances may only be granted to U.S. citizens. In addition, applicants who accept a conditional offer of employment may be subject to government security investigation(s) and must meet eligibility requirements for access to classified information.

By submitting your resume for this position, you understand and agree that L3Harris Technologies may share your resume, as well as any other related personal information or documentation you provide, with its subsidiaries and affiliated companies for the purpose of considering you for other available positions.

L3Harris Technologies is an E-Verify Employer.