Senior AI Infra Engineer, TikTok E-commerce Algorithm Architecture & Engineering

About the Team:
We are the Tik Tok E-commerce Algorithm Architecture & Engineering team (USDS). Our mission is to supercharge the efficiency and effectiveness of e-commerce algorithm services. We build user-friendly tools, elegant architecture, and robust, high-performance systems that drive GMV growth for Tik Tok E-commerce. Join us in building the most advanced e-commerce LLM/ML system & infrastructure in the industry.

• System Architecture & Implementation:
  Lead the design, implementation, and operation of scalable, reliable, and high-performance ML/LLM infrastructure and systems.
• Cross-Functional Collaboration:
  
  Partner effectively across various teams, organizations, and internal/external stakeholders to drive complex engineering efforts and align technical strategies.
• Innovation:
  Drive technical innovation by identifying and integrating emerging technologies and novel ideas to keep our infrastructure at the cutting edge.

• Bachelor's degree in Computer Science, Engineering, or a related technical discipline.
• 3+ years of hands‑on experience building, training, and deploying complex and scalable Machine Learning systems.
• Strong foundation in Computer Science, including algorithms, data structures, and software design patterns. Excellent problem‑solving abilities.
• Solid programming skills with a strong understanding of ML/LLM system internals.
• Proven experience in managing technical projects and delivering results.

• In-depth experience with Large Language Model (LLM) systems and infrastructure.
• Proficiency with high-performance LLM serving frameworks (e.g., vLLM, SGLang).
• Deep understanding of the full LLM serving stack and end-to-end inference optimization (latency, throughput, memory management).

Tik Tok USDS Joint Venture LLC is dedicated to the safety and security of millions of Americans who create, discover, and connect with what they love on the apps we operate. The Joint Venture has been established in compliance with the Executive Order signed by President Trump on September 25, 2025. Our foundation is a comprehensive data privacy and cybersecurity program we operate under defined safeguards to protect national security and secure U.S. user data, apps and the algorithm.

We safeguard the U.S. content ecosystem, holding decision‑making authority for trust and safety policies and moderation. USDS Joint Venture helps ensure Americans can continue to express their creativity, discover new hobbies and interests, and build thriving communities and businesses on a global scale.

On‑site presence across teams allows the company to operate with greater speed, alignment, and agility — especially in areas like real‑time decision‑making, team development, and integrated execution. As such, the company is shifting from a hybrid work model to a fully in‑person schedule up to 5 days a week.

Inspiring creativity is at the core of Tik Tok's mission. Our innovative product is built to help people authentically express themselves, discover and connect – and our global, diverse teams make that possible. Together, we create value for our communities, inspire creativity and bring joy – a mission we work towards every day.

We strive to do great things with great people. We lead with curiosity, humility, and a desire to make impact in a rapidly growing tech company. Every challenge is an opportunity to learn and innovate as one team. We're resilient and embrace challenges as they come. By constantly iterating and fostering an “Always Day 1” mindset, we achieve meaningful breakthroughs for ourselves, our company, and our users.

When we create and grow together, the possibilities are limitless. Join us.