Senior Data Scientist - AdTech

About the Role

We are seeking a Senior Data Scientist with strong machine learning expertise, analytical thinking, and business understanding to join our R&D team.

You will take ownership of key machine learning initiatives, particularly conversion prediction (CPA optimization), CTR prediction, and bidding optimization . The role focuses on translating business challenges into practical ML solutions, improving advertising performance, and maintaining existing ML models in production.

Key Responsibilities

• Develop, maintain, and optimize machine learning models, particularly CTR/CVR prediction.
• Understand business objectives and translate them into actionable ML solutions that deliver measurable impact.
• Analyze advertising performance, investigate anomalies, and identify opportunities for improvement.
• Design experiments and evaluate model effectiveness using both ML metrics and business KPIs.
• Take ownership of existing ML projects, ensuring their continuous improvement and reliability in production.
• Collaborate with Data Scientists, Engineers, and business teams to drive ML initiatives.

Requirements

Must Have

• 4+ years of experience in Data Science or Machine Learning, preferably with production ML experience.
• Experience solving real-world ML problems in AdTech, FinTech, or similar domains, particularly those involving incomplete, delayed, or biased labels.
• Strong knowledge of ML algorithms, feature engineering, model evaluation, and optimization.
• Proficiency in Python and ML frameworks such as Scikit-learn, XGBoost, or LightGBM.
• Strong business understanding and analytical problem-solving skills , with the ability to connect ML solutions to business outcomes.
• Ability to independently own ML projects, investigate issues, and drive improvements.
• Good English communication and collaboration skills.

Nice to Have

• Experience in RTB, CTR/CVR prediction, CPA optimization.
• Knowledge of A/B testing, model calibration, and online experimentation.
• Experience with large-scale data processing and production ML systems.
• Familiarity with LLMs and AI coding assistants.

What We Value

We value someone who understands not only how to build models, but also why they matter to the business — a proactive problem solver who takes ownership and focuses on real-world impact.

Benefits

• Competitive remuneration package including quarterly bonus and performance review opportunities.
• Full participation in mandatory insurance programs in accordance with Vietnamese Labor Law.
• Healthcare insurance package and annual health check-up.
• Comprehensive benefits scheme such as W3F (Work, Wellbeing, Welfare) Fund for courses, materials, personal health and wellbeing.
• Work from home benefits.
• You will have the advance to influence and drive the changes, at Knorex we welcome good ideas and accept any possibility to make our company great.
• We offer great learning opportunities; you will have exposure to cutting edge performance marketing and advertising technology.
• Opportunity to work cross-country and with a variety of projects of a different nature.