Xebia

Data Scientist

Xebia

full-time

Posted on:

Location Type: Remote

Location: Bulgaria

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Salary

💰 €35 per hour

Tech Stack

About the role

  • Designing and developing bidding and optimization strategies for CPC-based auction systems, including advanced objectives such as target ROAS
  • Optimizing auction mechanisms (ranking, pricing, filtering) to balance platform revenue, advertiser value, and marketplace stability
  • Building and maintaining offline simulation environments, including counterfactual simulations and auction replay systems, to safely evaluate algorithmic changes
  • Designing and implementing feedback loops and control mechanisms to ensure stable and robust system behavior under dynamic market conditions
  • Conducting advanced ecosystem-level analytics on large-scale datasets to identify nonlinear effects, equilibrium points, and systemic risks
  • Designing, executing, and analyzing complex experiments and causal inference studies, accounting for network effects and long-term system impact
  • Contributing to the evolution toward smart, autonomous bidding and auction optimization through data-driven initiatives and roadmap development

Requirements

  • Proficiency in Python and SQL, with experience working on large-scale datasets
  • Data analysis, statistical modeling, and algorithm prototyping experience
  • Strong quantitative background in Mathematics, Statistics, Data Science, Optimization, Decision Science, or Operations Research
  • Solid understanding of optimization theory, including linear, nonlinear, constrained, and stochastic optimization
  • Knowledge of game theory and market mechanisms, particularly in competitive or auction-based environments
  • Experience designing and implementing algorithms under multiple objectives and constraints, considering ecosystem-wide impact
  • Strong analytical and system-level thinking, with the ability to reason about feedback loops, system dynamics, and equilibrium behavior and translate business goals into quantitative solutions
  • Ability to collaborate effectively in cross-functional, international teams
  • Very good command of English (spoken and written)
Benefits
  • Flexible work arrangements
  • Professional development opportunities
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
PythonSQLdata analysisstatistical modelingalgorithm prototypingoptimization theorylinear optimizationnonlinear optimizationconstrained optimizationstochastic optimization
Soft Skills
analytical thinkingsystem-level thinkingcollaborationcommunicationquantitative reasoning