Principal Software Engineer

T-Mobile

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Quick summary

Work type: On-site
Location: Bellevue, WAAtlanta, GA
Salary: $173,500–$234,700 / yr
Employment: Full-time
Posted: 15 days ago
Freshness: Confirmed live today
Nearby: 99+ roles within 25 mi

Market check

Salary context

Competitive pay

How this pay compares to similar roles

Similar $195k

This role $204k

$131k $254k

below market most similar roles pay here above market

This role pays less than 51% of similar roles. Most pay $169,550–$220,800 — the blue band above. At the midpoint, this role pays about $204k versus about $195k for comparable roles.

Based on 240 similar postings.

Employer

About T-Mobile

T-Mobile US is the second-largest wireless carrier in the United States, providing wireless voice, messaging, and data services under the T-Mobile and Metro by T-Mobile brands. Industry: Wireless Telecommunications

T-Mobile currently has 72 open roles on FindRole.

Listed pay typically runs $138,996–$228,650 across 32 roles with salary data.

Most-posted roles

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At a glance

TL;DR · Principal Software Engineer

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The Principal Software Engineer sets the technical direction for systems making data usable across customer-facing applications, analytics, and AI-driven products. You will design and build high-performance services, APIs, distributed data stores, and real-time sync mechanisms to meet strict latency and reliability targets. Key responsibilities include developing serving infrastructure for AI use cases, designing Infrastructure-as-Code blueprints, and mentoring engineers while influencing organizational technology policies. You will utilize expertise in AI/ML infrastructure, knowledge graphs, vector databases, streaming and caching architecture, and API governance. The role solves complex systems challenges by creating scalable, real-time, AI-ready capabilities. Required skills include cloud computing, analytical thinking, and technical writing to deliver governed data pipelines and innovative software designs that enhance existing processes and support diverse business goals.

What does a Software Engineer earn in Washington?

Median $202800 from 409 postings across 38 companies.

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Skills

AI/ML Infrastructure Vector Databases Graph Databases Infrastructure-as-Code API Design Caching Architecture Data Sync Pipelines Cloud Computing Knowledge Graphs Software Development Technical Writing

What you'll do

Design and build serving infrastructure for AI use cases including vector and graph databases.
Develop high-performance data stores, real-time sync pipelines, and governed APIs.
Create Infrastructure-as-Code blueprints for provisioning serving stores and sync pipelines.
Drive engineering projects to deliver software solutions that meet technical requirements and quality standards.
Provide technical leadership by mentoring engineers and influencing technology decisions across the organization.
Produce clear technical documentation and architecture descriptions for internal and external stakeholders.
Evaluate and apply technology strategies that align with business goals and system requirements.

What we're looking for

Bachelor's Degree in Computer Science or Engineering plus 7 years of related work experience.
Advanced degree in Computer Science or Engineering plus 5 years of related experience.
7-10 years of technical engineering experience.
Experience with AI/ML infrastructure, knowledge graphs, and vector databases.
Proficiency in streaming and caching architecture, API design, and data sync pipelines.
Skills in MCP-style tooling, agent-facing data access patterns, and cloud computing.
Strong software development, technical writing, and leadership skills.
Must be at least 18 years of age and legally authorized to work in the United States.

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