Senior Data Scientist, Fullstack

WhyHireWrong?

Senior Fullstack Data Scientist leading GenAI architecture and mentor teams. Delivering production ML pipelines for enterprise clients in retail, CPG, and manufacturing.

Posted 5/20/2026full-timeWarsaw • 🇵🇱 PolandSenior💰 PLN 105 - PLN 170 per hourWebsite

Tech Stack

Tools & technologies

Python

About the role

Key responsibilities & impact

Lead the design and discovery phase for GenAI projects: translate business problems into concrete architectures covering model selection, RAG, agents, fine-tuning, and guardrails
Build complete GenAI solutions end to end, covering data ingestion, retrieval layers, orchestration (LangChain, LlamaIndex, LangGraph), API and backend
Design RAG pipelines using vector databases, hybrid search, rerankers, query transformation, and evaluation frameworks
Own prompting strategies, model selection, and fine-tuning approaches including LoRA, QLoRA, and supervised fine-tuning
Implement safety and governance controls: input/output filters, PII handling, audit logs, human-in-the-loop mechanisms
Gather technical requirements directly from client stakeholders and produce reliable delivery estimates
Mentor other data scientists and engineers on GenAI patterns, code quality, and best practices
Track the GenAI landscape actively and run targeted proof-of-concepts on emerging approaches

Requirements

What you’ll need

6 or more years in Data Science or AI engineering with a track record of shipping production systems, not just prototypes
4 or more years writing production-ready Python for AI and ML workloads: clean, maintainable, deployable code
2 or more years of hands-on production experience with LLM-based systems, including RAG pipelines, agent frameworks, and evaluation
The ability to make architectural decisions under uncertainty and defend them clearly to both technical and non-technical audiences
Fluent English for direct client communication.

Benefits

Comp & perks

Fully remote or office-based, your choice
Workation policy available for defined periods
Dedicated onboarding buddy from day one
Unlimited Udemy access and 110 or more training opportunities per year
Internal promotion pathways: 76% of promotions are internal

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

PythonGenAIRAGfine-tuningLoRAQLoRAdata ingestionvector databaseshybrid searchAPI

Soft Skills

mentoringcommunicationarchitectural decision-makingstakeholder engagementproblem-solving