AI Engineer – LLM Algorithm Engineer (Agentic Commerce)

SHOPEE SINGAPORE PRIVATE LIMITED; Singapore; On-site; SGD 180,000 - 240,000; Full time

Job summary

Shopee Singapore Private Limited is seeking an experienced ML/AI engineer to lead the continuous pre-training and post-training of large language models for vertical domains. You will design autonomous agents to retrieve, extract, and synthesize knowledge from multilingual data, and develop RL-based post-training methods to boost domain-specific QA and reasoning capabilities.

You will also build multimodal LLM applications for content generation and semantic recall, and design end-to-end agent

Qualifications

• Master's degree or above in CS/NLP/AI or related field.
• Minimum 5 years of full-time industry experience in LLM/ML engineering for vertical domains.
• Hands-on experience with large-scale model continuous pre-training (Dense and/or MoE).
• Experience designing autonomous agent systems for automated knowledge retrieval and synthesis.
• Experience fine-tuning/deploying multimodal large models with production impact.

Responsibilities

• Lead pre-training and post-training of LLMs for vertical domains.
• Design and build autonomous agents that retrieve and synthesize domain knowledge.
• Develop RL-based post-training methods to improve domain-specific QA and reasoning.
• Build multimodal LLM applications for content generation and recall.
• Design end-to-end agent workflows integrating query understanding and content generation.
• Create generative representation-learning pipelines for downstream models.
• Collaborate across teams to translate requirements into scalable model training and systems.

Skills

LLM engineering

Autonomous agents

Multimodal models

Production deployment

Python programming

Model evaluation

Education

Master's degree or above in CS/NLP/AI

Tools

LangGraph

PyTorch

TensorFlow

LightGBM

XGBoost

Job description

The Engineering and Technology team is at the core of the Shopee platform development. The team is made up of a group of passionate engineers from all over the world, striving to build the best systems with the most suitable technologies. Our engineers do not merely solve problems at hand; We build foundations for a long-lasting future. We don't limit ourselves on what we can or can't do; we take matters into our own hands even if it means drilling down to the bottom layer of the computing platform. Shopee's hyper-growing business scale has transformed most "innocent" problems into huge technical challenges, and there is no better place to experience it first-hand if you love technologies as much as we do.

Job Description:

• Lead continuous pre-training and post-training of large language models (Dense and MoE architectures) for vertical business domains, including domain-specific data synthesis, multi-stage data curation, and monthly iteration to support downstream business integration.
• Design and build autonomous agents (e.g., Plan-and-Execute agents) that automatically retrieve, extract, and synthesize domain knowledge from large-scale multilingual/unstructured data sources, producing high-confidence corpora for continued pre-training.
• Develop and iterate RL-based post-training methods (e.g., CPT, SFT, DAPO) to improve model performance on domain-specific QA, reasoning, and knowledge-modeling tasks.
• Build and optimize multimodal LLM applications for content generation and understanding, including product copywriting, semantic search recall, and business potential/CTR prediction.
• Design end-to-end agent workflows integrating query understanding, content generation, validation, and downstream product/search systems.
• Build generative representation-learning pipelines (e.g., token-based generative pre-training on behavioral sequences) to produce reusable embeddings for downstream ranking and recommendation models.
• Collaborate cross-functionally to translate business requirements into scalable model training and agent system design; continuously monitor production metrics to guide model and agent optimization.

Requirements:

• Master's degree or above in Computer Science, Natural Language Processing, Artificial Intelligence, Electrical and Electronics Engineering, Signal Processing or a related field.
• Minimum 5 years of full-time industry experience in LLM/ML algorithm engineering, including hands-on experience with large-scale model continuous pre-training (Dense and/or MoE architecture) for vertical business domains.
• Hands-on experience designing and building autonomous agent systems (e.g., using LangGraph or similar frameworks) for automated knowledge retrieval, extraction, and synthesis pipelines, combined with hands-on experience in LLM post-training techniques (SFT, RL-based methods such as DAPO) and data-mixture optimization techniques for pre-training data curation.
• Experience fine-tuning and deploying multimodal large models for content generation, semantic recall, or business potential prediction, with demonstrated production impact on key business metrics (e.g., CTR, conversion).
• Good programming and engineering skills; solid foundation in classic ML techniques (e.g., LightGBM, XGBoost, Bayesian modeling) is a plus.
• Good problem-solving skills; able to independently drive projects from research through to large-scale production deployment.
• Prior experience in multimodal retrieval/recommendation systems (e.g., cross-modal contrastive learning for content matching) will be a strong plus.