Data Scientist

GFR Fund; Warszawa; On-site; PLN 180,000 - 330,000; Full time

Job summary

Samba in Warsaw is seeking a mid-level Data Scientist to own end-to-end delivery of major data science projects with minimal guidance. You will be a reliable, autonomous contributor with deep expertise in measurement or audience modelling, building production-ready ML/AI solutions and mentoring junior data scientists.

You’ll collaborate with product, engineering, and operations to translate business requirements into technical specs, design scalable pipelines, and ensure reproducibility of

Qualifications

• Bachelor's or higher in Statistics, Data Science, CS, Math or related quantitative field.
• 3–5 years of hands-on data science experience with end-to-end project ownership.
• Advanced Python with production-grade code, SQL and PySpark for billion-row datasets.
• Experience with Databricks workflows, Delta Lake, and job orchestration on cloud platforms (AWS or GCP).
• Proficiency with MLOps: experiment tracking, pipeline orchestration (Airflow), and reproducible deployment.
• Exposure to modern AI: LLM-augmented models, vector similarity, semantic search, and knowledge graphs.

Responsibilities

• Own end-to-end delivery of significant data science projects from scoping to production deployment.
• Make independent methodological decisions and document them clearly in technical solution docs.
• Lead solution design with well-scoped user stories and acceptance criteria, applying DataOps and MLOps best practices.
• Build production-grade Python and PySpark code on Databricks, with robust tests and docs.
• Develop reusable tools and libraries, and perform code reviews to raise engineering standards.
• Mentor junior data scientists and lead internal ML talks or workshops.
• Collaborate cross-functionally with product, engineering, and operations to translate requirements into tech specs.

Skills

Python

SQL

PySpark

Databricks

Airflow

MLOps

LLMs

RAG systems

Entity resolution

Education

Bachelor's degree (quantitative field)

Tools

Databricks

Delta Lake

AWS

GCP

Job description

Samba is a media intelligence company. We know what the world is watching, reading, and thinking about - in real time, at scale, across every screen. Our data exists with the consent of over a billion people, organized into the most complete picture of consumer attention ever built. The biggest brands in the world use that picture to make smarter decisions. We think it's the most interesting data asset on the planet, because it's the most culturally relevant.

As a mid-level Data Scientist at Samba in Warsaw, you will own end-to-end delivery of significant data science projects with minimal guidance. You are a reliable, autonomous contributor with deep expertise in at least one of Samba's core domains - measurement, or audience modelling - and the technical range to build production-ready solutions using modern ML and AI methodologies. You'll work closely with peers, product, and engineering, and play an active role in mentoring junior data scientists on the team.

What You'll Do

• Own end-to-end delivery of significant data science projects - from problem scoping and approach design through to production deployment
• Make sound, independently-reasoned decisions on methodology, model selection, and evaluation; document them clearly in technical solution documents covering problem statement, approach, metrics, and timeline
• Lead solution design for your own initiatives; break down complex epics into well-scoped user stories with clear acceptance criteria, adopting DataOps and MLOps best practices throughout - experiment tracking, pipeline orchestration, model monitoring, and reproducibility
• Build production-quality Python and PySpark code on Databricks - well-tested, documented, and reusable - and implement advanced ML and AI-powered workflows including entity resolution, probabilistic record linkage, embedding-based matching, semantic similarity, and LLM-augmented pipelines
• Develop and maintain reusable tools, libraries, and documentation that improve team efficiency and technical standards; conduct code reviews with constructive, specific feedback that raises the bar
• Mentor junior data scientists on technical execution, code quality, and career development; lead internal talks or workshops on ML topics
• Collaborate cross-functionally with product, engineering, and operations - translate business requirements into technical specifications, partner with data engineering on scalable pipeline design, and participate in cross-functional design reviews and working groups

Who You Are

• Bachelor's degree required in Statistics, Data Science, Computer Science, Mathematics or a related quantitative field; Master's strongly preferred
• 3-5 years of hands-on data science experience with demonstrated ability to own and deliver complex, multi-sprint projects independently
• Advanced Python with production-quality code, testing, and documentation; strong SQL and PySpark for billion-row datasets
• Databricks workflows, Delta Lake, and job orchestration; working knowledge of cloud platforms (AWS or GCP)
• Solid command of core ML - regression, classification, clustering, model evaluation, and experimental design - applied to complex, high-volume data
• Proficiency with MLOps practices: experiment tracking, pipeline orchestration (Airflow), and reproducible model deployment
• Exposure to modern AI methodologies: RAG systems, LLM-augmented models, vector databases, and semantic search
• Strong communicator - able to translate technical work into clear documentation, user stories, and cross-functional conversations
• Demonstrated ability to mentor junior data scientists and contribute to team standards

Preferred Skills

• Hands-on experience with knowledge graph construction, entity resolution, or semantic data modeling (RDF, OWL, SPARQL, or equivalent graph frameworks)
• Familiarity with probabilistic record linkage, identity graph approaches, or embedding-based entity matching at scale
• Experience with causal inference methods (A/B testing, synthetic control, uplift modeling)
• Experience with deduplication, enrichment, or web-to-TV linkage problems
• Background in media, ad tech, or measurement - TV viewership (ACR/STB data), digital audience modeling, cross-platform measurement (linear + CTV/OTT), or identity resolution in privacy-constrained environments
• Familiarity with the measurement and identity vendor landscape (Nielsen, Comscore, LiveRamp, The Trade Desk)

Samba is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We strive to empower connection with one another, reflect the communities we serve, and tackle meaningful projects that make a real impact.

Samba may collect personal information directly from you, as a job applicant, Samba may also receive personal information from third parties, for example, in connection with a background, employment or reference check, in accordance with the applicable law. For further details, please see Samba's Applicant Privacy Policy. For residents of the EU , Samba Inc. is the data controller.

180000 - 330000 PLN a year