> Markdown version of [/jobs/ext/2979479-senior-principal-software-engineer-5g-core-networks](https://www.wearedevelopers.com/jobs/ext/2979479-senior-principal-software-engineer-5g-core-networks). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Principal Software Engineer - 5G Core Networks - **Company:** RTX - **Location:** San Jose, CA, United States (Remote available) - **Experience:** Expert - **Salary:** $145,600.0 - $276,800.0 - **Contract:** Permanent contract - **Skills:** Microsoft Access, 4G (Telecommunication), Application Programming Interfaces (APIs), Amazon Web Services, Linux, Distributed Systems, Python (Programming Language), Kernel-Based Virtual Machine, Network Functions Virtualization, Network Interface, Network Monitoring, Network Virtualization, OpenStack, Prometheus, Reverse Engineering, Session Management, Software Engineering, Software Systems, Grafana, Containerization, Kubernetes, Decoding, C++14, Docker, Vmware, Microservices - **Published:** September 18, 2026 - **Apply:** https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-CA-SAN-JOSE-826--200-Holger-Way--BLDG-826/Senior-Principal-Software-Engineer---5G-Core-Networks_01875458 ## About the Role 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, * 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 issued TS/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. ## Description * 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. ## Related Videos - [Unleash the power of 5G in your code: transform your apps](https://www.wearedevelopers.com/videos/1567-unleash-the-power-of-5g-in-your-code-transform-your-apps) - [WebAssembly: The Next Frontier of Cloud Computing](https://www.wearedevelopers.com/videos/972-webassembly-the-next-frontier-of-cloud-computing) - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [Generating code with Angular schematics](https://www.wearedevelopers.com/videos/129-generating-code-with-angular-schematics) - [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker) - [Unlocking the potential of Digital & IT at Vodafone](https://www.wearedevelopers.com/videos/602-unlocking-the-potential-of-digital-it-at-vodafone) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [5 Reasons Why Attending Conferences in 2026 Matters More Than You Think](https://www.wearedevelopers.com/magazine/692-5-reasons-why-attending-conferences-in-2026-matters-more-than-you-think) - [Highest Paying Tech Companies in Europe](https://www.wearedevelopers.com/magazine/162-highest-paying-tech-companies-in-europe)