About the Role
This is a founding-level, hands-on ML engineering role at a fast-growing Series A AI startup in the Bay Area, specializing in high-quality training data, post-training data pipelines, and model evaluation for frontier AI labs and enterprises. You'll work closely with leadership to design, train, and ship production-grade ML systems — while helping shape the technical culture and infrastructure from the ground up.
This role is fully on-site in Mountain View, CA. Candidates must be authorized to work in the US without visa sponsorship.
What You'll Do
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Build and optimize end-to-end ML pipelines, from data ingestion through to production deployment.
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Implement and fine-tune LLMs, embeddings, and generative models for real-world applications.
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Develop efficient training and inference systems leveraging distributed compute at scale.
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Partner with data and product teams to translate ideas into measurable ML impact.
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Contribute to model monitoring, evaluation, and continual learning frameworks.
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Establish best practices in model versioning, reproducibility, and scalability across the organization.
What We're Looking For
Required
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3–10 years of hands-on experience as an ML Engineer, Applied Scientist, or Research Engineer.
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Proficiency in Python and at least one of PyTorch, TensorFlow, or JAX.
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Proven experience building production-grade, end-to-end ML pipelines (data ingestion, training, deployment).
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Experience implementing and fine-tuning LLMs, embeddings, and generative models for real-world use cases.
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Hands-on experience with distributed training/inference and scalable ML systems.
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Familiarity with cloud platforms (AWS, GCP, or Azure) and ML tooling such as MLflow or Weights & Biases.
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Strong collaboration skills with cross-functional data and product teams.
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Bias for action, ability to work autonomously, and eagerness to build from scratch.
Nice to Have
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Experience with RL environments or evaluation frameworks for AI models.
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Background in agentic systems, tool-use pipelines, or multi-step execution trajectories.
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Prior experience at an early-stage startup or in a founding-engineer capacity.
Compensation & Benefits
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Salary: $220,000 – $300,000 per year, depending on experience.
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Equity participation as a founding team member.
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Opportunity to directly shape technical direction, culture, and hiring at an early-stage, high-growth company.
Location
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On-site in Mountain View, California.
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No visa sponsorship available — candidates must have existing US work authorization.
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