Job Description

Team Introduction:

TT-Search Algorithm & Applied AI is the algorithm team behind the search business built on TikTok (TikTok Search), with the goal of becoming the search engine of choice for users worldwide. Compared with recommendation systems, which passively infer user intent, search delivers content based on users' discovery motivation — making intent expression more precise — and can in turn feed back into the recommendation engine. We are at an inflection point where the search paradigm is shifting from "retrieval-and-ranking" toward "Agents proactively completing tasks." With large language models and Agents as our two driving wheels, we build the search LLM foundation, the Agent execution framework (Harness), multi-agent collaboration, and self-improvement closed loops, supporting the implementation of business scenarios such as multimodal AIGC, visual search, on-device intelligence, and long-horizon task Agents — spanning POI search, Wish search, automated evaluation, infrastructure, and more.

Job Responsibilities

1. Search LLM Foundation: Lead the R&D and iteration of the search-domain LLM foundation, integrating search knowledge for rapid implementation; own the pre-training / post-training pipeline for search LLMs (ultra-long-text / colloquial-text pre-training, image-text / video multimodal representation, e-commerce product multimodal representation learning) as well as inference optimization (long context, model efficiency, quantization / pruning / distillation / inference acceleration).

2. Agent Foundation & Harness: Own the 0→1 / 1→N build-out of the search Agent execution framework (Harness) — unified orchestration of tool calling, planning, memory, and environment interaction; design multi-agent cluster scheduling and collaboration algorithms (task allocation, dynamic scheduling, communication / alignment / conflict resolution); build the Agent Foundation platform to empower the team's engineers / algorithm researchers / PMs with full-stack, lightweight development and rapid launch (multi-agent / single-agent + skill-based / memory), supporting the core search intelligent assistant and vertical-search scenario modules.

3. Loop Engineering, Long-term Memory & Self-Improvement (RSI): Lead the Agent Loop and the "training–inference–evaluation" closed loop; build long-term memory mechanisms for LLMs, cross-context knowledge integration, causal reasoning, and autonomous concept induction capabilities; implement self-evolve / self-improvement and recursive self-improvement (RSI) mechanisms (automated hyperparameter tuning, training pipeline automation, AI-assisted algorithm design, automated model iteration closed loop).

4. Data Synthesis & Evaluation Systems: Build high-quality vertical-domain data synthesis and quality control (distribution alignment, synthetic data evaluation / filtering / refinement); own the online Reward/Verifier system and superhuman-capability benchmark evaluation (annotation-free automated evaluation, long-cycle complex tasks, cross-domain innovation capability evaluation, multi-agent collaboration evaluation standards).

5. Business Implementation & Scaling:

-Long-horizon task Agents (persistent intent)

-Multimodal AIGC creation: leveraging SOTA models to provide image/video generation capabilities and amplify scale effects; powering the Feed's "ask-after-viewing / create-after-viewing" experiences to strengthen users' proactive mindset;

-Visual search & on-device intelligence: object detection, OCR, TinyLLM;

-Search content ecosystem / creator ecosystem, etc.

6. Frontier Exploration (plus): Pre-research into next-generation non-Transformer architectures, AGI safety and alignment (goal-consistency constraints for large-scale multi-agent systems, interpretability / auditability / safety mechanisms), and other directions, and driving their integration with business scenarios.

7. Technical Accumulation & Output: Abstract algorithm libraries and interfaces to improve reuse and R&D efficiency; regularly share SOTA models to empower the search team and company-level BUs; mentor and support the growth of team members.