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Principal, Machine Learning Engineer (L5)

Twilio· Engineering
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RemoteFull-timePosted 2w ago

About the role

Principal ML Engineer role in Twilio’s Customer Memory Team focused on building foundational AI/ML capabilities for intelligent engagement experiences, bridging research, production-grade experimentation, and enterprise software at scale.

Responsibilities

  • Build out new functionality within a fast moving product with rapid adoption.
  • Take nebulous ideas, design rigorous experiments, and execute within weeks.
  • Conduct deep-dive research into state-of-the-art LLM orchestration, retrieval strategies, and data-driven personalization.
  • Build ML systems that scale to Twilio’s needs.
  • Rapidly acquire new technical skills in a fast-paced, high-delivery environment.
  • Proactively leverage and integrate the latest AI development stacks to bypass boilerplate and focus on core differentiation.

Qualifications

  • 10+ years applied ML/AI experience with track record of owning technically ambitious systems end to end.
  • Comfort operating in a 0-to-1 setting with ambiguous requirements and a strong bias for action.
  • Proficiency in Python.
  • Experience building cloud-based services on AWS, GCP, or Azure, with high-volume data, streaming or real-time inference, and various data stores.
  • Deep expertise in design, architecture, and deployment of production-grade ML/AI systems, including LLM orchestration, embedding models, and vector stores.
  • Strong fundamentals of statistical ML algorithms, transformer models, LLMs.
  • Ability to raise the technical bar of a team through mentorship, design review, and standards without formal management authority.
  • Strong communication and collaboration skills.

Skills

Required:PythonCloud platformsLLM orchestrationEmbedding models & vector storesMachine learning systems at scaleResearch and experimentationCommunication & collaboration

Benefits

  • Competitive pay
  • Generous time off
  • Parental and wellness leave
  • Healthcare
  • Retirement savings program
  • Location-based offerings
Last updated Oct 15, 2026. Interested? Apply on the company site.

About Twilio

Twilio platform for communications and programmable APIs across messaging, voice, video, and AI-enabled workflows.

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