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.