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    SI

    Sigma Software

    AdTech

    Senior Data Scientist

    Warsaw, PolandRemoteFull-time5+ yrs experiencePosted 2w ago
    All Sigma Software jobs

    Job description

    • Build and improve censored bid-landscape models to estimate clearing-price distributions from partially observed auction data
    • Develop real-time win probability estimation models responsive to bid pricing dynamics
    • Design and implement hierarchical lift estimation models with confidence-bound-based selection strategies
    • Build conversion propensity models using sparse, delayed, and aggregate-only labels
    • Develop look-alike audience modeling approaches using positive-unlabeled learning and embedding-based nearest-neighbor techniques
    • Implement advertiser-level calibration strategies while independently monitoring ranking and calibration quality
    • Design robust offline evaluation frameworks using inverse-propensity scoring, doubly-robust estimators, and importance reweighting
    • Define exploration strategies and propensity logging approaches to ensure reliable downstream correction and evaluation
    • Develop constrained optimization mechanisms for campaign objectives, pricing constraints, and volume targeting
    • Contribute to data diagnostics, capability assessments, and evidence-based model recommendations
    • Collaborate with the Customer team during post-launch tuning and performance validation cycles
    • Prepare technical documentation and knowledge transfer materials for the Customer’s internal data science team
    • Participate in architecture discussions and contribute to scalable ML platform design decisions
    • 5+ years of experience in Machine Learning or Data Science with production-grade models measured against business KPIs
    • Strong Python skills including numpy, pandas, and scikit-learn
    • Strong SQL skills and experience working with large-scale datasets
    • Deep practical experience with XGBoost, LightGBM, or CatBoost
    • Strong understanding of regularization, calibration methods, and categorical feature handling
    • Strong knowledge of probability, statistics, confidence intervals, and statistical power analysis
    • Experience with feature engineering for structured and behavioral datasets
    • Hands-on experience with Spark or PySpark
    • Practical knowledge of experimentation frameworks and A/B testing methodologies
    • Experience with advanced validation approaches including temporal splits, leakage detection, drift analysis, and slice-based metrics
    • Understanding of explainability techniques such as SHAP and permutation importance
    • Upper-Intermediate English level or higher

    WILL BE A PLUS

    • Experience in AdTech modeling including CTR/CVR prediction, bid-landscape modeling, audience segmentation, and RTB mechanics
    • Experience working with sparse, delayed, or censored labels
    • Knowledge of attribution modeling, survival analysis, and positive-unlabeled learning
    • Practical experience with counterfactual and off-policy evaluation techniques
    • Understanding of calibration methods including isotonic regression and Platt scaling
    • Experience with hierarchical, empirical-Bayes, or partial-pooling models
    • Knowledge of constrained or multi-objective optimization approaches
    • Experience with uplift modeling and causal inference methods
    • Experience with Vertex AI or similar managed ML training environments
    • Publications, competitive modeling achievements, or open-source contributions related to Machine Learning or AdTech

    PERSONAL PROFILE

    • Strong analytical and problem-solving skills
    • Ability to work effectively in a highly data-driven environment
    • Strong communication and stakeholder management abilities
    • Ability to explain complex modeling decisions to technical and non-technical audiences
    • Proactive mindset with strong ownership mentality
    • Attention to detail and scientific rigor in experimentation and evaluation

    Job details are sourced from the employer's original posting.

    Open job posting
    SI

    About the company

    Sigma Software

    We are looking for a Senior Go Developer to join our dynamic team and work on cutting-edge AdTech solutions. This role offers the opportunity to experiment with AI, LLMs, and emerging technologies while solving complex challenges in large-scale data processing.  CUSTOMER Our customer is a global leader in contextual advertising with more than 500 employees worldwide. They specialize in delivering highly relevant ads by leveraging AI, real-time technology, and large-scale data processing. Operating in the AdTech industry, they are recognized for innovation in Connected TV (CTV) advertising. The team you will join works with the agility of a startup while benefiting from the resources of a global organization. PROJECT You will contribute to the development of a smart advertising platform that processes terabytes of data to understand audiences and deliver precise, contextual ads. The platform combines AI, LLMs, and emerging technologies to push the boundaries of CTV advertising. In this role, you will own innovation end-to-end — from research and prototyping to delivering production-ready solutions.

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    Industry
    AdTech
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