Data Scientist / ML Engineer

Our customer is a product company with a truly global presence, specializing in mobile app monetization. They provide a platform that helps developers grow their businesses through intelligent mediation and cutting-edge data tools. The team is composed of international professionals dedicated to building history-defining solutions for the mobile industry. As they scale, they need a Data Scientist/ML Engineer to bridge the gap between complex datasets and actionable ad-tech performance. You will join the Barcelona-based team to build the intelligent systems that optimize ad targeting and bid strategies for thousands of apps globally. What You'll Drive Optimize Ad Efficiency: Design and deploy end-to-end models that directly improve ad targeting, bid strategies, and campaign ROI Scale Intelligent Systems: Develop high-performance data science solutions from initial analysis through to production-ready deployment Uncover Trends: Independently analyze massive datasets to identify patterns that drive business decisions and product innovation Enhance Pipelines: Maintain and optimize existing ML models and data pipelines to ensure efficiency within the fast-moving ad-tech ecosystem Bridge Tech and Business: Translate complex technical requirements into data-driven insights that non-technical stakeholders can act upon Who You Are AdTech Expert: You bring 2+ years of experience specifically within the ad-tech domain or a closely related field. Experienced Engineer: You have 3+ years of professional experience in data science, ideally within a product-focused company. Python & SQL Specialist: You are highly proficient in Python and SQL, with hands-on experience using PySpark and Pandas. ML Practitioner: You have a proven track record of training DNN models using PyTorch and managing workflows with Hydra or Comet. Cloud Native: You are comfortable working with AWS cloud services to deploy and manage data solutions. How You'll Work You will be an integral part of the Data Science team in Barcelona, working in a cross-functional environment alongside both technical and business teams. This role requires a balance of independent problem-solving and deep collaboration to ensure models align with dynamic market trends. Decisions are data-driven, and you will have the autonomy to own your projects from development to deployment. While the company supports remote collaboration globally, this specific role is based in the city-center office in Barcelona to foster close-knit team innovation. What You'll Get Career Growth: Professional development opportunities and a clear path for advancement within a fast-growing environment Work-Life Balance: Flexible work arrangements and a culture that respects personal time Relocation Support: Assistance with relocating to a vibrant hub in Barcelona Impactful Projects: The chance to work on high-stakes ML projects that influence the global mobile ecosystem What Happens Next Screening call with an All The Hires team member to ensure general fit, motivation, and availability Internal HR Screen: An initial conversation to discuss your background and expectations with a member of the customer's recruiting team Technical Interview (Coding & ML Fundamentals): A 60-minute deep dive into your core technical skills Technical Interview (System Design): A 60-minute session focused on architectural and scalable thinking Bar Raiser / Hiring Manager Stage: A final 30–45 minute conversation to discuss mission alignment and culture fit If this sounds like the challenge for you, apply today!