Senior ML Engineer — Bidding & AI Systems

Senior Machine Learning Engineer, Vector Bidding Science

Mountain View, CA, USA, Full-time

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We are looking for Senior Machine Learning Engineers to join our Vector Bidding Science team. In this role, you will define the technical vision and architect the next generation of scalable real-time bidding systems powered by cutting-edge AI, marketplace intelligence, and advanced optimization frameworks. As a key member of the Vector AI org, you will play a pivotal role in advancing Unity’s high-scale ads engine.

By harnessing massive datasets and rich signals, you will develop state-of-the-art bidding and pacing algorithms that automatically maximize advertisers’ returns.

• Design, implement, and optimize core bidding algorithms and auction mechanisms
• Architect and scale bid landscape forecasting capabilities
• Analyze large-scale marketplace dynamics to uncover deep insights and deliver algorithmic improvements
• Drive offline evaluations and online A/B experiments to validate model performance and deliver measurable business impact
• Collaborate cross-functionally with product, infrastructure, and engineering teams

• Hands‑on experience on state‑of‑the‑art machine learning, reinforcement learning, and control theory to complex, real‑world bidding or pricing problems
• Strong software engineering skills in Python and experience with deep learning frameworks, preferably Py Torch
• Solid understanding of metric design, online experimentation frameworks (A/B testing), and large‑scale data analysis
• Proven ability to lead projects end‑to‑end and deliver measurable business impact in an ambiguous technical landscape

• Experience working with large datasets and distributed computing frameworks (e.g., Spark, Ray, Big Query, Flink)
• Experience building real‑time ad systems, specifically in DSP (Demand‑Side Platform) bidding logic, survival analysis for market price estimation, or game‑theoretic modeling
• Experience leveraging AI tools (such as Claude Code, Git Hub Copilot, and Cursor) to accelerate development

• Relocation support is not available for this position

At Unity, we want our team members to thrive. We offer a wide range of benefits designed to support well‑being and work‑life balance. While specific benefits vary, here are some of the ways we strive to take care of our eligible team members globally:
Comprehensive health, life, and disability insurance | Commute subsidy | Employee stock ownership | Competitive retirement/pension plans | Generous vacation and personal days | Support for new parents through leave and family‑care programs | Office food snacks | Mental Health and Wellbeing programs and support | Employee Resource Groups | Global Employee Assistance Program | Training and development programs | Volunteering and donation matching program

Unity [NYSE: U] is the world’s leading game engine, powering play for more than 3 billion consumers each month. The top mobile games in the world, the most played PC indie titles, the most innovative console games, and virtually all of the top XR and Web Games are developed, deployed, and grown in Unity. Unity also enables teams across industries like automotive, manufacturing, and healthcare to design, simulate, and collaborate in 3D — closing the…