Senior Machine Learning Engineer, Advertiser Growth

The OpportunityUnity's Advertiser Growth team leverages artificial intelligence and statistical optimization to maximize returns and reduce effort for advertisers running campaigns on the Unity ad network. Our ads reach billions of devices, and every improvement we ship directly moves outcomes for thousands of advertisers worldwide.We are looking for a senior Machine Learning engineer to lead the design of the optimization algorithms at the heart of this mission. In this role, you will be a technical authority on how we automate campaign optimization: how bids, budgets, and targeting decisions are made to serve each advertiser's goals with minimal manual effort. You will bridge advanced quantitative methodology and large-scale engineering, working where multi-objective optimization, exploration-exploitation trade-offs, long-term value measurement, and LLM-powered agentic systems meet real-time production systems.What you'll be doingMulti-objective campaign optimization: Design and ship algorithms that optimize across a variety of advertiser goals - installs, ROAS, retention, and spend efficiency - under real-world budget and marketplace constraints.Exploration–exploitation strategy: Design strategies (e.g., bandits, reinforcement learning) that balance short-term performance against long-term value, so campaigns learn efficiently without sacrificing advertiser returns.Long-term impact measurement: Develop efficient methodologies to measure the long-term impact of model and product changes, including surrogate metrics that give short-term signals for long-term advertiser and user value.Metrics frameworks for launch decisions: Define the metrics frameworks that guide what we ship - clear, trustworthy criteria that connect model improvements to advertiser outcomes and business results.Agentic automation for advertisers: Build LLM agent systems that automate campaign diagnostics and setup recommendations - agents that analyze campaign performance, identify root causes and recommend or apply configuration changes, so advertisers state their goals and trust the system to deliver.Cross-functional technical leadership: Serve as a lead subject matter expert for ML, Product, and Engineering partners, ensuring quantitative rigor from model design through live production auctions.What we're looking forExperience in machine learning, data science, or applied research, ideally within ad tech, marketplaces, or other large-scale optimization domains.Advanced education: An MS or PhD in a quantitative field (Computer Science, Statistics, Operations Research, Economics, or equivalent).Quantitative depth: The skills to design algorithms that optimize among competing goals, design exploration-exploitation strategies balancing short-term and long-term value, build efficient methodologies for measuring long-term impact, and define metrics frameworks that guide launch decisions.Agentic system experience: Hands-on experience building LLM-based agentic systems - tool use, orchestration, retrieval over domain data, and evaluation of agent quality - ideally applied to diagnostics, recommendations, or workflow automation.Technical proficiency: Strong programming skills in Python or Scala, and experience with large-scale data processing frameworks such as Spark, Snowflake, or BigQuery.Production track record: A history of shipping ML systems that operate on high-volume, real-time data and delivering measurable business impact.Strategic leadership: Ability to translate complex quantitative concepts into clear product roadmaps and mentor engineers on modeling and optimization rigor.You might also havePrior experience with dynamic ads or creative optimization. E.g., dynamic creative assembly, creative ranking and selection, or generative creative pipelines.Hands-on experience with bidding, pricing, pacing, or auction systems in digital advertising.Familiarity with long-term value (LTV) prediction and surrogate metric design in mobile gaming or digital advertising.Experience with reinforcement learning or contextual bandits in production.Experience fine-tuning or evaluating LLMs, or building multi-agent orchestration frameworks.Additional informationAnnual gross base salary: $148,700 - $244,600 USDThis range reflects the anticipated base salary for this position. Beyond base salary, this role may be eligible for equity awards and participation in our company incentive plans (such as annual discretionary bonuses or sales commissions). The final offer amount will depend on several factors, including geographic location and the candidate’s relevant experience, professional background, and skill set.BenefitsAt Unity, we want our team members to thrive. We offer a wide range of benefits designed to support well-being and work-life balance.Please note: Benefits eligibility, specific offerings, and coverage vary based on the country and employment status.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 programLife at UnityUnity [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 gap between ideas and reality. For more information, please visit is a proud equal opportunity employer. We are committed to fostering an inclusive, innovative environment and celebrate our employees across age, race, color, ancestry, national origin, religion, disability, sex, gender identity or expression, sexual orientation, or any other protected status in accordance with applicable law. Our differences are strengths that enable us to support the growing and evolving needs of our customers, partners, and collaborators. If you have a disability that means there are preparations or accommodations we can make to help ensure you have a comfortable and positive interview experience, please fill out this form to let us know.This position requires the incumbent to have a sufficient knowledge of English to have professional verbal and written exchanges in this language since the performance of the duties related to this position requires frequent and regular communication with colleagues and partners located worldwide and whose common language is English.This posting is intended to fill an existing vacancy, and we are committed to providing applicants with updates throughout the hiring process in accordance with applicable law.Headhunters and recruitment agencies may not submit resumes/CVs through this website or directly to managers. Unity does not accept unsolicited headhunter and agency resumes. Unity will not pay fees to any third-party agency or company that does not have a signed agreement with Unity.Your privacy is important to us. Please take a moment to review our Prospect and Applicant Privacy Policies. Should you have any concerns about your privacy, please contact us at View email address on click.appcast.io. #J-18808-Ljbffr