Senior Principal Software Engineer – 5G Core Networks

Collins Aerospace; San Jose (CA); Presencial; USD 146.000 - 277.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Medical, dental, and vision insurance

Retirement plan

Relocation assistance

Tuition reimbursement

Life & disability insurance

Descripción de la vacante

Collins Aerospace's Applied Signal Technology (AST) seeks a Senior Principal Software Engineer specializing in 5G Core Networks to advance secure, high-performance telecommunications processing solutions on an onsite basis in San Jose, CA. You will collaborate with technical leaders to shape roadmaps, elicit CONOPS, and deliver innovative software while supporting customer engagements and demonstrations.

You will perform technical research, develop documentation and presentations, and lead

Formación

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of prior relevant experience.
• Aggregate of 7 years software development experience in one or more of the following areas: Developing 3GPP network functions, network interfaces, and/or service-based interfaces such as UPF, AMF, and/or SMF.
• Developing protocols such as NAS, PFCP, GTP-U, and/or HTTP/2.
• Reverse engineering telecommunications protocols.
• Troubleshooting distributed systems and control-plane signaling paths.
• Using 5G core network control-plane probes.
• Developing service-based microservices with REST-like APIs.
• Demonstrated expertise developing Linux-based software systems utilizing modern C++, Python, or equivalent environments to architect, implement, and validate complex telecommunications processing solutions.
• Ability to obtain and maintain a U.S. government issued Top Secret SCI (TS/SCI) security clearance with polygraph after start.
• U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Responsabilidades

• Apply your 5G Core Network software development experience to advance our next generation mobile telecommunications processing solutions.
• Collaborate with technical leaders to further product visions and roadmaps and develop innovative software solutions.
• Collaborate with customers to elicit requirements and CONOPS, and
• Perform technical research, develop technical documentation, presentations, and/or lead concept demonstrations.
• Travel up to 15% travel time to other AST sites and customer sites to support meetings and deployments.

Conocimientos

5G Core

C++/Python

Linux systems

Network protocols

Distributed systems

Educación

STEM degree

Herramientas

Docker

Kubernetes

OpenStack

VMware

Go

Rust

Descripción del empleo

Date Posted: 2026-09-17

Country: United States of America

Location: US-CA-SAN JOSE-826 ~ 200 Holger Way ~ BLDG 826

Position Role Type: Onsite

U.S. Citizen, U.S. Person, or Immigration Status Requirements: The ability to obtain and maintain a U.S. government issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Security Clearance Type: TS/SCI with Polygraph

Security Clearance Status: Active and existing security clearance required after day 1

Raytheon Company Managed by Collins Aerospace

At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world.

Collins Aerospace is a leader in technologically advanced, intelligent solutions that help redefine the aerospace and defense industry. With a comprehensive portfolio and deep technical expertise, we help customers meet the demands of the global market. Join us and help shape the future of aerospace and defense.

Applied Signal Technology (AST) is seeking a Senior Principal Software Engineer with specialization in protocol development within 5G Core Networks who strives for excellence and has a passion to be part of a team that strengthens our nation and improves the security of our world.

AST provides trusted strategic and tactical SIGINT solutions that secure the interests of the U.S. and its partners. AST’s work in areas such as high-capacity broadband communications, signal processing and analysis, tactical SIGINT, and wireless communications continually challenge our extraordinary engineers to resolve problems and make the world a safer place. AST’s work environment is passionate, highly collaborative and provides engineers with the freedom to strengthen and expand their skills, explore new and creative ideas, and work closely with our nation’s finest service members all while embracing integrity, innovation, and work-life balance.

This is an ONSITE position at the San Jose, CA location.

What You Will Do:

• Apply your 5G Core Network software development experience to advance our next generation mobile telecommunication processing solutions by:
• Collaborating with technical leaders to further product visions and roadmaps and developing innovative software solutions,
• Collaborating with customers to elicit requirements and CONOPS, and
• Performing technical research, developing technical documentation, presentations, and/or leading concept demonstrations.
• Travel up to 15% travel time to other AST sites and customer sites to support customers meetings and/or demonstrations, system deployments.

Qualifications You Must Have:

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of prior relevant experience
• Aggregate of 7 years software development experience in one or more of the following areas:
• Developing 3GPP network functions, network interfaces, and/or service-based interfaces, such as:
• User Plane Function (UPF), Access and Mobility Management Function (AMF), and/or Session Management Function (SMF),
• N4 and/or N11 network interfaces, and/or
• Namf, Nsmf, and/or Nupf services.
• Developing protocols such as NAS, PFCP, GTP-U, and/or HTTP/2.
• Reverse engineering telecommunications protocols.
• Troubleshooting distributed systems and control-plane signaling paths.
• Using 5G core network control-plane probes.
• Developing service-based microservices with REST-like APIs.
• Demonstrated expertise developing Linux-based software systems utilizing modern C++, Python, or equivalent environments to architect, implement, and validate complex telecommunications processing solutions.
• Ability to obtain and maintain a U.S. government issued Top Secret SCI (TS/SCI) security clearance with polygraph after start.
• U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Qualifications We Prefer:

• Existing U.S. government issuedTS/SCI security clearance with polygraph or current SSBI.
• Knowledge of AMF, SMF, UPF, UDM, PCF, AUSF, NRF behavior, interactions, and call flows.
• Experience developing 5G core network control-plane probes for monitoring network traffic, extracting signaling and user-plane information, decoding 3GPP protocols, and/or traffic replay.
• Experience with observability frameworks (OpenTelemetry, Prometheus, Grafana)
• Familiarity with 4G EPC (MME, SGW, PGW, HSS).
• Familiarity with network virtualization and/or containerization technologies (KVM, VMware, OpenStack, AWS, Kubernetes, Helm, Docker).
• Experience developing with Go or Rust.

What We Offer

• Medical, dental, and vision insurance
• Three weeks of vacation for newly hired employees
• Generous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy option
• Tuition reimbursement program
• Student Loan Repayment Program
• Life insurance and disability coverage
• Optional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protection
• Birth, adoption, parental leave benefits
• Ovia Health, fertility, and family planning
• Adoption Assistance
• Autism Benefit
• Employee Assistance Plan, including up to 10 free counseling sessions
• Healthy You Incentives, wellness rewards program
• Doctor on Demand, virtual doctor visits
• Bright Horizons, child and elder care services
• Teladoc Medical Experts, second opinion program
• Eligible for relocation
• And More!

The salary range for this role is 145,600 USD - 276,800 USD.

RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.

RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.

Privacy Policy and Terms:

Click on this to read the Policy and Terms.