Sr. Lead AI Engineer

What You'll Do

• Build and own the end-to-end model fine-tuning pipeline: data preprocessing, training, evaluation, and model registry.
• Implement and optimize fine-tuning techniques (QLoRA, LoRA, PEFT, full fine-tune) for our training workloads.
• Design and maintain evaluation harnesses with task-specific benchmarks and automated regression testing.
• Drive the training iteration loop: analyze results, diagnose failure modes, improve data and configuration.
• Implement experiment tracking, hyperparameter optimization, and reproducible training workflows.
• Collaborate on training data strategy with data engineering, including synthetic data generation.
• Evaluate model quality across safety, accuracy, latency, and cost dimensions.
• Contribute to model serving architecture and inference optimization.
• Mentor ML engineers across the team.

What You Will Bring to Coupa

• 10+ years of software engineering experience, with 4+ years focused on ML/NLP systems.
• Hands-on experience fine-tuning large language models with parameter-efficient methods.
• Strong knowledge of transformer architectures, tokenization, and training optimization.
• Experience building production ML training pipelines with experiment tracking.
• Proficiency in Python, PyTorch, and distributed training frameworks.
• Experience with GPU-based training infrastructure in the cloud.
• Strong evaluation methodology: designing benchmarks, measuring quality, detecting regressions.
• Experience with RLHF, DPO, or other alignment techniques is a strong plus.
• BS/MS in Computer Science, Machine Learning, or equivalent experience.