Senior ML Research Engineer – AI & Generative Recommendation (m/f/d)

adjoeis redefining the future of mobile ads. Powered by advanced AI, first\-party data and world\-class engineers, we’ve perfected the offerwall experience for monetizing and scaling app publishers with solutions like Playtime – now the fastest growing rewarded advertising channel globally – driving incremental engagement, retention, and revenue. Together, this ecosystem connects app developers to over 770 million users worldwide for scalable growth. We are a profitable, high\-growth company backed by a $100 million investment from Bertelsmann. Operating from offices in Hamburg, Boston, Singapore, and Tokyo, adjoe is defining the next stages of app and ad experience – right now. Join us.

What You Will Do:

• Architect Multi\-Stage Recommendation Pipelines: Lead the design and implementation of our AI\-Native Recommendation Pipelines, encompassing Generative Retrieval, Deep Ranking, and Re\-ranking, serving millions of requests.


• Bridge Theory to Production: Act as the team’s primary "Paper2Code Ninja," distilling SOTA research (NeurIPS, KDD, RecSys) into robust, production\-ready code optimized for sub\-millisecond latency.


• Evolve Content Understanding: Direct the research on information\-rich embeddings, utilizing unsupervised and generative approaches to create a unified representation of users and ads.


• Scale Innovative Tech: Own the transfer of innovative technologies into high\-concurrency environments, ensuring large\-scale generative models thrive under extreme production constraints.


• Act as a Team Multiplier: Lead architectural debates, mentor junior scientists, and foster a collaborative environment where constructive feedback pushes the team to excel.

• The Scholar\-Architect: PhD in CS, Stats, Math, or Physics (or MSc with extensive industry research) and a track record of publications in top\-tier venues (SIGIR, KDD, NeurIPS, ICLR, etc.).


• RecSys Veteran: 4\+ years of professional experience building large\-scale recommenders in high\-throughput industries (AdTech, E\-com, or Social).


• Full\-Stack Researcher: Deeply proficient in PyTorch with experience in high\-concurrency optimization, model quantization, and distillation.


• Independent Driver: You don't need a roadmap; you create it. You thrive on solving "unsolved" problems with a direct impact on business ROI.

• Invest in Your Future: Regular feedback and our development program support your growth, helping you expand your skillset and achieve your career goals.


• Easy Arrival to adjoe: From signing to settling in Berlin, we’ve got you covered. Need a visa? No problem. Ready to build your new life and career at adjoe in Berlin? We support every ambition—from learning German to a relocation bonus that helps you settle in and make Hamburg feel like home.


• Live Your Best Life, at Work and Beyond: We work in a hybrid setup with 3 core office days, plus flexible working hours. Enjoy 30 vacation days, 3 weeks of remote work per year, and free access to an in\-house gym with lots of different fitness classes and mental health support through our Employee Assistance Program (EAP).


• Join the Community! Participate in regular team and company events, including hackathons and social gatherings. We work together, and we celebrate together, too.

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