Lingaro

Fullstack Data Scientist - freelancer

Poland Freelance Hybrid
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Job Description

Tasks

Lead discovery and solution design for GenAI use cases, translating business problems into concrete architectures (LLM decision, RAGs, fine-tuning, agents, guardrails).

Build end-to-end GenAI applications: data ingestion, retrieval layer, orchestration (e.g. LangChain/LlamaIndex/LangGraph), API/backend, and simple UI where needed.

Design and implement RAG pipelines with vector databases, hybrid search, rerankers, query transformation, and evaluation frameworks for relevance and robustness.

Perform model selection, prompting strategies, and fine-tuning (LoRA/QLoRA/SFT) for text, code, and multimodal models, including evaluation and A/B testing.

Implement safety, compliance, and governance controls (input/output filters, PII handling, audit logs, human-in-the-loop review where required).

Collaborate with data engineers, product owners, and full-stack developers on scalable architectures, SLAs, and integration with existing enterprise systems.

Gather technical requirements and estimate planned work.

Mentor other data scientists/engineers in GenAI patterns, code quality, and best practices; contribute to internal libraries, templates, and reusable components.

Stay current with GenAI landscape (new open and hosted models, agentic frameworks, evaluation techniques) and perform targeted PoCs to validate them. What We're Looking For:

6+ years of experience in Data Science/AI engineering.

At least 4+ years of experience in production-ready Python AI-related code development.

At least 2+ years of experience in production-ready LLM-related code development, preferably based on the Retrieval-Augmented Generation (RAG) concept.

Strong analytical and problem-solving skills with the ability to optimize AI solutions for diverse applications.

Strong knowledge and experience in Generative AI, including LLMs, chatbots, AI agents, and RAG mechanisms.

Deep understanding of LLM evaluators, validators, and guardrails.

Hands-on experience with one or more GenAI frameworks: LangChain, LlamaIndex, LangGraph, or similar orchestration stacks.

Hands-on experience designing or operating MCP servers/clients for LLM agents

Strong Python skills, including production-grade code, packaging, and testing for data/ML services

Solid understanding of ML/AI concepts: types of algorithms, machine learning frameworks, model efficiency metrics, model lifecycle, AI architectures.

Proven ability to collaborate effectively across technical and non-technical teams.

Familiarity with cloud environments such as Azure (preferred), GCP, or AWS, including AI-related managed services.

Familiarity with CI/CD, testing, and containerized deployments.

Excellent communication skills in English, with the ability to convey complex technical concepts to various audiences. What Will Set You Apart:

Experience in designing and programming ML algorithms and data processing pipelines using Python.

Good understanding of CI/CD and DevOps concepts, with experience working with selected tools (preferably GitHub Actions, GitLab, or Azure DevOps).

Experience in productizing ML solutions using technologies like Spark/Databricks or Docker/Kubernetes.

Experience with agentic AI development frameworks (e.g., BMAD, multi-agent orchestration, spec-driven AI workflows).

Frequently Asked Questions

What does the Fullstack Data Scientist - freelancer role at Lingaro involve?

The Fullstack Data Scientist - freelancer position at Lingaro in Poland is a freelance role. Tasks: Lead discovery and solution design for GenAI use cases, translating business problems into concrete architectures (LLM decision, RAGs, fine-tuning, agents, guardrails). Build end-to-end GenAI applications: data ingestion, retrieval layer, orchestration (e.g. LangChain/LlamaIndex/LangGraph), API/backend, and simple UI where needed. Design and implement RAG pipelines with vector databases, hybrid search, rerankers, query transformation, and evaluation frameworks for relevance and robustness. Perform model selection, prompting strategies, and fine-tuning (LoRA/QLoRA/SFT) for text, code, and multimodal models, including evaluation and A/B testing.

What skills are required for Fullstack Data Scientist - freelancer at Lingaro?

Key skills for this role include: Python, Scala, Rails, AWS, Azure, GCP, Docker, Kubernetes, CI/CD, Github Actions.

What is the salary for Fullstack Data Scientist - freelancer at Lingaro?

The salary for this position is not publicly listed. You can negotiate during the interview process. Check Glassdoor or Levels.fyi for estimates.

Is the Fullstack Data Scientist - freelancer position at Lingaro remote or on-site?

This position is Hybrid. Expect a combination of office and remote work, typically based in Poland.

How do I apply for Fullstack Data Scientist - freelancer at Lingaro?

You can apply for this position directly through the employer's careers page. Click the 'Apply Now' button on this page to be redirected to the original listing. Make sure your resume is ATS-optimized. Use SpotChange's free ATS test to check.

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About This Role

Fullstack Data Scientist - freelancer at Lingaro is a freelance data & analytics position in Poland. Key skills include Python, Scala, Rails, AWS, Azure, GCP, Docker, Kubernetes. Education: Master's Degree preferred. Experience: 6+ years.

This role is classified as hybrid and is suitable for mid level-level professionals. Ghost Score 20/100 (Probably Active) indicates this listing is probably active with recent employer engagement.

To apply, visit the official application page through the Apply Now button above. SpotChange Jobs provides AI-powered career tools including resume optimization, ATS testing, interview preparation, and salary negotiation assistance.