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Lead Machine Learning Engineer

ASAPP - Mountain View, CA, USA - In-office - posted 2026-09-11

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ASAPP is hiring a Machine Learning Engineer to lead the technical development of an evaluation platform for agentic and LLM-based systems. This is a high-impact role combining hands-on engineering with technical leadership and mentorship. You will own the technical roadmap and architecture for the evaluation platform, spanning offline benchmarking through online production monitoring. Key responsibilities include: • Designing evaluation methodologies appropriate to different pipeline stages: golden/regression test sets, human-in-the-loop review workflows, LLM-as-judge approaches, and automated metrics for task success, safety, and hallucinations. • Building the data infrastructure that evaluation depends on: annotation and labeling pipelines, dataset versioning, data quality checks, and self-service tooling for researchers and product teams to run and interpret experiments independently. • Partnering closely with Research, Product, and Platform teams to productize experiments into robust AI solutions. • Representing the eval platform to stakeholders, setting expectations for model/agent releases, and reporting on platform health and coverage. • Staying current with advancements in ML, NLP, voice, and LLM systems, and contributing to technical discussions across teams. • Mentoring and supporting other engineers through design reviews, feedback, and knowledge sharing. This role requires deep, hands-on experience building and operating evaluation systems for modern ML/LLM/agentic systems—not just consuming existing tools. You will be accountable for the long-term health and architecture of a complex, data-intensive system. REQUIREMENTS: • Deep, hands-on experience building and operating evaluation systems for modern ML/LLM/agentic systems. • Demonstrated experience leading technical direction of a project or small team: setting architecture, driving design reviews, and being accountable for system long-term health. • Strong architectural skills with proven experience designing complex, data-intensive software systems. • Production experience with Python, AWS, Kubernetes, and/or Docker. • Experience designing data pipelines for ML evaluation: labeling/annotation workflows, dataset versioning, quality control, and reproducible benchmarking. • Bachelor's Degree in CS or related field. • Demonstrated technical mentorship of junior and mid-level engineers, driving adoption of best practices and architectural alignment. • Desire to learn, teach, and collaborate closely with cross-functional peers. NICE-TO-HAVE: • Experience building and evaluating agentic systems at scale. • Experience with voice/audio quality evaluations. • Production experience with LLM-centric services (inference, orchestration, evaluation, monitoring). • Familiarity with large-scale ML experimentation, benchmarking, or simulation frameworks. • Experience with conversational/customer-support AI domains (containment rate, conversation quality, goal completion). • Knowledge of techniques for optimizing model architectures for faster inference. • Experience with AWS, CI/CD, Kafka, Athena.

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