Senior Machine Learning Developer, Advertiser Growth | Développeur(euse) Sénior en apprentissage machine, Advertiser Growth

The opportunity
At Unity, we are building a world-class ad-tech ecosystem that connects billions of users with the creators and experiences they love. The Advertiser Growth team is the engine of this mission, ensuring that as our marketplace expands, advertisers have the intelligent tools, robust infrastructure, and rigorous experimentation frameworks needed to scale their impact.

In 2026, our roadmap is defined by three transformative pillars: Foundation, Smart, and Intelligence. This role is unique in its technical breadth, sitting at the intersection of financial execution, creative innovation, and marketplace science. You will architect the GenAI systems that build high-performing creatives, design the pacing algorithms that manage multi-million dollar budgets, ensure our billing pipelines handle massive scale with zero-fault tolerance, and build the experimentation infrastructure that allows us to scientifically evolve the marketplace. This is a high-stakes role where your technical leadership directly governs Unity’s financial integrity and the long-term growth of our ecosystem.

What you'll be doing

• Next-Gen budget pacing: Design and optimize sophisticated pacing controllers (PID, probabilistic forecasting) to smooth advertiser spend across diverse time zones and traffic spikes, ensuring optimal delivery and marketplace stability.
• Creative GenAI infrastructure: Lead the backend integration of Generative AI models (Diffusion, LLMs) to automate the creation of high-performing image and video assets tailored to specific campaign goals and formats.
• Marketplace experimentation engine: Build and scale the infrastructure for high-velocity experimentation, including A/B testing, switchback tests, and long-term holdouts to measure the impact of marketplace changes on advertiser ROI and platform health.
• High-Scale billing reliability: Architect and maintain high-throughput billing pipelines that process billions of events with 100% accuracy, bridging the gap between real-time ad delivery and mission-critical financial reconciliation.
• Scientific optimization: Analyze complex financial and marketplace datasets to refine the trade-off between spend velocity and advertiser performance, using experimentation results to tune pacing and billing logic.

What we're looking for

• Advanced degree in computer science or relevant engineering-related field or equivalent experience.
• 6+ years of software engineering experience, including 3+ years working on ads delivery systems.
• Extensive experience building and operating large-scale, low-latency backend systems using languages like Java, Go, or Scala.
• Deep familiarity with building or maintaining budget control systems, feedback loops, or spend-prediction algorithms.
• Proven experience building or scaling experimentation platforms, with a deep understanding of variance reduction, interference/network effects, and metric design in a marketplace context.
• A track record of working on "mission-critical" pipelines (like billing, payments, or clearinghouses) where data precision, idempotency, and fault tolerance are paramount.
• Experience or strong technical interest in building the backend workflows required to serve, scale, and store Generative AI models for creative asset generation.
• Proficiency with real-time stream processing (Kafka, Flink, or Spark) specifically applied to event-based charging and real-time performance feedback.
• A proven ability to lead complex, multi-quarter technical roadmaps and mentor senior engineers in a high-growth environment.

Additional information

• Relocation support is not available for this position

Life at Unity

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 gap between ideas and reality. For more information, please visit www.unity.com.

Unity is an equal opportunity employer committed to fostering an inclusive, innovative environment with the best employees. Therefore, we provide employment opportunities without regard to age, race, color, ancestry, national origin, disability, gender, or any other protected status in accordance with applicable law. 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.

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.

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L’opportunité
Chez Unity, nous bâtissons un écosystème publicitaire de calibre mondial qui relie des milliards d'utilisateurs(rices) aux créateurs(rices) et aux expériences qu'ils/elles aiment. Notre équipe Advertiser Growth est le moteur de cette mission. Au fur et à mesure que notre place de marché s'étend, elle veille à ce que les annonceurs(ses) aient entre les mains les outils, l'infrastructure et les cadres d'expérimentation nécessaires pour avoir un impact réel.

En 2026, notre feuille de route s'articule autour de trois piliers : Foundation, Smart et Intelligence.
Ce rôle se distingue par son étendue technique. Il est ancré à la fois dans l'exécution financière, l'innovation créative et la science des places de marché.
Vous concevrez les systèmes GenAI qui alimentent la production de créatifs performants, développerez les algorithmes qui orchestrent des budgets publicitaires à grande échelle, et veillerez à ce que nos Pipelines de facturation absorbent des milliards d'événements sans jamais flancher. Vous bâtirez aussi l'infrastructure d'expérimentation sur laquelle repose notre capacité à faire évoluer la place de marché de manière rigoureuse. Ici, vos choix techniques ne restent pas dans le vide : ils touchent directement à l'intégrité financière d'Unity et à la croissance de tout l'écosystème.

Ce que vous allez faire

• Concevoir et optimiser des contrôleurs de cadence sophistiqués (PID, prévision probabiliste) pour lisser les dépenses des annonceurs(ses) selon les fuseaux horaires et les pics de trafic, en garantissant une diffusion optimale et la stabilité de la place de marché.
• Diriger l'intégration côté serveur de modèles d'IA générative (Diffusion, LLMs) pour automatiser la création d'images et de vidéos performantes, adaptées aux objectifs et aux formats de chaque campagne.
• Bâtir et faire évoluer l'infrastructure d'expérimentation à haute vélocité, incluant les tests A/B, les switchback tests et les groupes de contrôle à long terme, afin de mesurer l'impact des changements de la place de marché sur le ROI des annonceurs(ses) et la santé de la plateforme.
• Concevoir et maintenir des Pipelines de facturation à haut débit qui traitent des milliards d'événements avec une précision absolue, en faisant le pont entre la diffusion publicitaire en temps réel et la réconciliation financière critique.
• Analyser des ensembles de données financières et de place de marché complexes pour affiner l'équilibre entre la vélocité des dépenses et la performance des annonceurs(ses), en s'appuyant sur les résultats d'expérimentation pour ajuster la logique de cadence et de facturation.

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