Senior AI Engineer: Generative AI & Agentic Systems

T-Mobile US Inc.; Factoria (WA); Hybrid; USD 133,000 - 240,000; Full time

Benefits offered by this job

Stock grants

Employee stock purchase plan

401(k)

Paid time off

Education assistance

Job summary

T-Mobile US Inc. is seeking a Senior AI Engineer to architect and optimize the agentic AI systems powering our customer service experiences.

You will design AI that coordinates across models, APIs, and tools to deliver reliable, production-grade workflows and intuitive customer interactions. Join us to advance prompt engineering, model fine-tuning, evaluation frameworks, and system orchestration that scale across millions of real-world conversations.

Qualifications

• Proficient in Python and OO design principles.
• Experience building RESTful APIs with modern frameworks.
• Hands-on with LLMs, prompting, and tool integration.
• Experience deploying AI workloads on cloud platforms.
• Familiarity with embeddings, vector databases, and semantic search.
• Ability to design scalable, secure distributed systems.
• Strong collaboration and communication skills.

Responsibilities

• Design, develop, and deploy scalable, production-grade Generative AI applications and agentic AI systems.
• Architect AI agents and multi-agent workflows with LangGraph/LangChain.
• Develop RAG solutions using embeddings and semantic search across enterprise data.
• Build secure RESTful APIs and MCP connectors for internal/external systems.
• Optimize AI performance via prompts, model selection, and efficient inference.
• Create AI evaluation frameworks for accuracy, reliability, latency and cost.
• Develop cloud-native AI solutions on Azure/AWS/Google Cloud.
• Implement security, governance and responsible AI practices.
• Establish observability and troubleshooting for AI workflows in production.
• Collaborate with cross-functional teams to productionize AI enhancements.
• Mentor engineers and contribute to engineering standards.

Skills

Python programming

API design & development

Generative AI & LLMs

Agentic AI & orchestration

RAG & data retrieval

Cloud platforms (Azure/AWS/GC)

DevOps & CI/CD

System architecture

Data analysis & modeling

AI evaluation & QA

Cross-functional collaboration

Education

Bachelor's Degree + 5 years related work experience

Advanced degree preferred

Tools

LangGraph

LangChain

RESTful APIs

FastAPI

MCP connectors

Docker

Kubernetes

Job description

T-Mobile US Inc. is seeking a Senior AI Engineer to architect and optimize the agentic AI systems powering our customer service experiences.

You will design AI that coordinates across models, APIs, and tools to deliver reliable, production-grade workflows and intuitive customer interactions. Join us to advance prompt engineering, model fine-tuning, evaluation frameworks, and system orchestration that scale across millions of real-world conversations.