Senior Data Scientist (DSP)

TL;DR

Senior Data Scientist (DSP): Architecting and implementing machine learning models for campaign optimization within the DSP environment with an accent on bid strategies, budget allocation, and pacing algorithms for programmatic campaigns. Focus on leading the design of model orchestration, driving data and ML strategy for audience segmentation, and integrating new models into production systems.

Location: Must be based in the European Union region with a valid work permit and active VAT status in the EU VIES registry.

Salary: 20 000 – 30 000 PLN net + VAT (B2B)

Company

hirify.global is a global tech company specializing in cloud, data, and software solutions, with a strong presence in CEE and clients like Spotify and Disney.

What you will do

• Architect and implement machine learning models for campaign optimization focusing on bid strategies, budget allocation, and pacing algorithms within the DSP environment.
• Lead the design of the model orchestration layer to solve complex multi-objective optimization challenges.
• Work at the intersection of Product and Engineering to ensure the model suite operates in sync to maximize performance.
• Drive data and ML strategy for audience segmentation and targeting capabilities utilizing first- and third-party data sources.
• Collaborate closely with Product and Engineering teams to integrate new models and data pipelines into production systems.
• Conduct deep-dive analytics to uncover strategic insights into campaign performance and translate findings into actionable product recommendations.
• Serve as a subject matter expert in ad-tech data science, presenting complex methodologies and results clearly.
• Mentor junior data scientists and contribute to the team’s culture of rigorous experimentation and innovative problem-solving.

Requirements

• Master’s or Ph.D. Degree in Computer Science, Statistics, Economics, or a hard science field preferred.
• 7+ years of professional experience in a Data Scientist role, with a significant focus on the advertising technology (ad-tech) space.
• Deep, demonstrable expertise in DSPs, programmatic advertising, and CTV measurement.
• Proven track record in developing and deploying models for bidder optimization and attribution/measurement.
• Fluent in advanced statistical and machine learning techniques, with a strong command of Python and SQL.
• English: Upper-intermediate (B2+) required.
• Work from the European Union region and a work permit are required.
• Candidates must have an active VAT status in the EU VIES registry.

Nice to have

• Experience with GCP and the Vertex AI ecosystem, as well as other tools such as feature stores and experiment tracking.
• Experience with LLMs and agentic AI frameworks/solutions, with special focus on evaluation.

Culture & Benefits

• Development budgets of up to 6,800 PLN and funded certifications (AWS, Azure, ISTQB, PSM).
• Access to Udemy and O'Reilly (formerly Safari Books Online), events, and technology conferences.
• Technology Guilds, internal training, and hirify.global Upskill programs.
• Private medical healthcare, MultiSport card, and mental health support.
• Flexible working hours with B2B or permanent contract options.
• Internal and external referral programs, plus a welcome gift.

Hiring process

• CV review.
• HR call.
• Technical Interview.
• Client Interview.
• Hiring Manager Interview.
• Decision.