Senior Machine Learning Engineer

HarnhamSonoma, CA, US

30+ days ago

Job type

Full-time

Job description

SENIOR MACHINE LEARNING ENGINEER - SEARCH & RECOMMENDATIONS

Hybrid – Bay Area (3 Days / Week Onsite)

$160,000 – $190,000 Base + Equity

About the Company

We're a fast-growing online marketplace backed by a major global tech player. Our platform helps millions of people buy and sell items in a way that feels social, personalized, and community-driven.

With a strong base of engaged users on both the buying and selling side, we're investing heavily in AI and machine learning to improve product discovery, build smarter seller tools, and make the platform safer and more enjoyable for everyone. We're now growing our ML Engineering team to help make these experiences smarter, faster, and more scalable.

About the Role

We're looking for a Senior Machine Learning Engineer to lead some of the most critical AI / ML initiatives across our platform. You'll be responsible for designing and building machine learning systems that impact millions of users — from personalized recommendations and smarter search to seller tools and fraud detection.

This is a high-impact, hands-on role best suited for someone with deep experience in ML systems who wants to own projects end-to-end and help shape the future of a fast-moving, high-scale marketplace.

What You'll Be Doing

Lead development of core ML systems that power recommendations, personalization, and trust & safety
Design both batch and real-time pipelines that take models from experimentation to full production
Collaborate with data scientists to turn prototypes into scalable, production-ready models
Improve and maintain our MLOps systems (serving, monitoring, retraining, etc.)
Help set technical direction across multiple teams and mentor other engineers
Partner with product and infrastructure teams to drive big-picture decisions

Our Tech Stack

Languages & Frameworks : Python, PyTorch, TensorFlow

Tools : Airflow, Spark, MLFlow, Databricks, Feature Store

Infrastructure : AWS + GCP, supporting real-time and batch workflows

Model Serving : Vector databases, scalable inference pipelines, model monitoring tools

What We're Looking For

2+ years of engineering experience, including 1+ years working on ML systems in production

Experience building and scaling recommendation, search, or personalization systems

Strong understanding of distributed systems, model performance, and production deployment

Able to design systems that balance speed, reliability, and cost

Experience working on large-scale marketplaces, e-commerce, or other consumer platforms

Why You'll Love It Here

You'll join a small but mighty team making a real difference in how people shop, discover, and sell online. You'll have the freedom to lead major projects, contribute to technical strategy, and see your work drive real business results — all within a supportive, fast-paced environment.

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Senior Machine Learning Engineer • Sonoma, CA, US

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