Sr Engineer, Systems Architecture - 5G Core Packet Gateways

T-Mobile • Bellevue, WA

6d

About The Position

At T-Mobile, we invest in YOU! Our Total Rewards Package ensures that employees get the same big love we give our customers. All team members receive a competitive base salary and compensation package - this is Total Rewards. Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches. That’s how we’re UNSTOPPABLE for our employees! Job Overview This role develops and evolves technical network and service architectures to support the organization’s technology portfolio, with a focus on packet core systems providing data and voice connectivity. The position combines architecture design with hands-on engineering to support deployment and integration of 5G Core and EPC technologies. Success is measured by the effectiveness of architecture designs, technical documentation quality, and the ability to improve deployment efficiency and reduce reliance on external vendors. The work impacts organizational technology capabilities and customer service delivery through improved network and service architectures.

Requirements

• Bachelor's Degree plus 5 years of related work experience OR Advanced degree with 3 years of related experience (Required)
• Acceptable areas of study include Computer Science or Engineering or related field (Required)
• 5+ years of technical engineering experience with focus on mobile or packet core networks (Required)
• Experience with packet core technologies across 4G EPC and/or 5G core networks
• Hands-on experience with packet gateway platforms (e.g., Cisco, Nokia or similar), including system configuration and deployment
• Strong understanding of packet core interfaces and protocols such as HTTP/2, GTP, PFCP, and IP networking fundamentals
• Experience supporting deployment and integration of network platforms in production environments
• Familiarity with cloud-native or containerized environments (e.g., Kubernetes, OpenShift)
• Strong troubleshooting skills using logs, traces, packet captures, and performance metrics
• Experience with scripting or automation tools such as Python, Bash, or Ansible
• Focus: Able to communicate goals in support of the business' mission (Required)
• Drive: Self-motivated and able to work well under pressure (Required)
• Teamwork: Ability and desire to work cooperatively with others on a team. Develop, maintain, and strengthen partnerships that can provide information, assistance, and support. (Required)
• Communication: The ability to ensure that information is passed on to others who should be kept informed. Express self clearly in conversations and interactions with others. Clear business and technical writing skills. (Required)
• Customer Focus: The ability to demonstrate concern and meet external and/or internal customers’ needs. (Required)
• Analytical: The ability to tackle a problem by using a logical, systematic, sequential approach. (Required)
• Technical Expertise: The ability to demonstrate depth of knowledge and skill in a technical area. (Required)
• Forward Thinking: The ability to anticipate the implications and consequences of situations and take appropriate action to be prepared for possible contingencies. (Required)
• Influencing Others: The ability to gain others' support for ideas, proposals, projects, and solutions. (Required)
• At least 18 years of age
• Legally authorized to work in the United States

Nice To Haves

• Experience with containerized network functions (CNFs) and cloud-native packet core deployments
• Exposure to automation frameworks or AI-assisted operational tools
• Experience working in vendor or service provider environments supporting packet core deployments

Responsibilities

• Contribute to the design and implementation of packet core network solutions across 5G (SA/NSA) & 4G EPC environments, including SMF, UPF, SGW, and PGW
• Design and support deployment of containerized packet core elements on platforms such as Kubernetes/OpenShift
• Perform hands-on configuration and initial setup (“day 0”) of packet core gateway platforms, including system bring-up, service provisioning, routing, and policy configuration
• Support repeatable deployment and integration of packet core platforms into the network, working across engineering and operations teams
• Design scalable and resilient solutions aligned with 3GPP standards and existing architecture frameworks
• Collaborate with internal teams and vendors to translate business and service requirements into deployable network solutions
• Analyze signaling and user-plane behavior to troubleshoot performance, interoperability, and service issues
• Develop and maintain technical documentation including architecture designs, implementation procedures, and operational guidelines
• Evaluate network simulations, test results, and platform performance to inform design improvements
• Apply scripting and automation to improve deployment efficiency, configuration consistency, and operational workflows
• Mentor and support associate engineers through technical guidance and knowledge sharing
• Also responsible for other duties/projects as assigned by business management as needed

Benefits

• Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches.
• employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role.
• medical, dental and vision insurance, a flexible spending account, 401(k), employee stock grants, employee stock purchase plan, paid time off and up to 12 paid holidays - which total about 4 weeks for new full-time employees and about 2.5 weeks for new part-time employees annually - paid parental and family leave, family building benefits, back-up care, enhanced family support, childcare subsidy, tuition assistance, college coaching, short- and long-term disability, voluntary AD&D coverage, voluntary accident coverage, voluntary life insurance, voluntary disability insurance, and voluntary long-term care insurance.
• eligible employees can also receive mobile service & home internet discounts, pet insurance, and access to commuter and transit programs!

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 5,001-10,000 employees