AI Engineer – LLM Algorithm Engineer (Agentic Commerce)

Hammerjack Pty Ltd; Philippines; On-site; PHP 2,000,000 - 4,500,000; Full time

Job summary

Hammerjack Pty Ltd in the Philippines is seeking a senior ML/LLM engineer to lead continuous pre-training and post-training of large language models for domain-specific applications.

You will design autonomous agents, implement RL-based post-training, and build multimodal LLM apps for content generation, semantic recall, and business predictions. This role requires deep expertise and the ability to drive production deployments.

Qualifications

• Master's degree or above in Computer Science, NLP, AI, EE, Signal Processing or related field.
• Minimum 5 years of full-time industry experience in LLM/ML algorithm engineering.
• Hands-on experience building autonomous agent systems for automated knowledge retrieval and synthesis.
• Experience fine-tuning and deploying multimodal large models with production impact.
• Strong programming and ML fundamentals; knowledge of classic ML techniques is a plus.
• Experience in multimodal retrieval/recommendation is a strong plus.

Responsibilities

• Lead continuous pre-training and post-training of large language models for domain-specific data.
• Design and build autonomous agents to retrieve and synthesize domain knowledge from multilingual data.
• Develop RL-based post-training methods to improve QA and reasoning tasks.
• Build and optimize multimodal LLM applications for content generation and recall.
• Design end-to-end agent workflows and integrate with product/search systems.
• Create generative representation-learning pipelines for embeddings used in ranking models.
• Collaborate cross-functionally to translate business requirements into scalable training and deployment.

Education

Master's degree or above in Computer Science or related field

Tools

LangGraph

LightGBM

XGBoost

Job description

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.