Senior Data Scientist – Real‑time Mobile Advertising

About the role

Start.io is looking for a Senior Data Scientist to join its fast‑growing R&D team. You will work on massive real‑time mobile audience data, building AI‑driven solutions that power billions of ad impressions worldwide.

Key responsibilities

• Analyze large, complex datasets to uncover hidden patterns and business opportunities.
• Design, develop, and maintain end‑to‑end highly scalable data pipelines.
• Create state‑of‑the‑art machine‑learning models and algorithms for monetisation and recommendation use‑cases.
• Provision data models for real‑time (online) processing and continuously improve existing data products.
• Collaborate with Product, BI, Analysts, DevOps, R&D and Marketing teams to deliver integrated solutions.
• Lead full production releases, including requirement analysis, testing, monitoring, and rapid issue response.

Required profile

• B.Sc./M.A./M.Sc. in Computer Science, Engineering, Mathematics, Statistics or a related field.
• At least 6 years of experience as a Data Scientist with a strong background in machine‑learning concepts and models.
• Hands‑on experience with Python and data‑science libraries (e.g., XGBoost, LightGBM, recommendation system algorithms).
• Proficiency in SQL and understanding of database concepts.
• Familiarity with monitoring and alerting tools such as Grafana and Kibana.
• Knowledge of programmatic advertising ecosystems (DSPs, SSPs, exchanges) is a strong advantage.
• Experience with relational databases (Vertica, VoltDB) and non‑relational databases (MongoDB).
• Experience with PMML for model deployment.

Required skills

• Python
• XGBoost
• LightGBM
• Recommendation system algorithms
• SQL
• Grafana
• Kibana
• Vertica
• VoltDB
• MongoDB
• PMML