AI / ML Engineer (Mid / Senior) – LLM, RAG, Python

AI / ML Engineer (Mid / Senior) - LLM, RAG, Python

Kraków, Poland | Hybrid model (2 days per week in the office)

Rate: 180-220PLN netto

For our client, we are looking for AI / ML Engineers (Mid and Senior level) to join a small, highly skilled engineering team building cutting-edge AI solutions for complex financial data and decision-making systems.

This is an exciting opportunity to work on flagship Artificial Intelligence and Machine Learning initiatives, leveraging Large Language Models (LLMs), Retrieval-Augmented Generation (RAG), and modern ML techniques to solve real-world business challenges within the Credit & Lending domain.

You will be involved in the full lifecycle of AI solutions-from discovery and experimentation through design, development, deployment, and optimization.

Key Responsibilities

As an AI / ML Engineer, you will:

• Design, test, and optimize prompts for Large Language Models (LLMs)
• Build intelligent solutions using Retrieval-Augmented Generation (RAG) and vector databases
• Develop scalable services and APIs powering AI-driven applications
• Work across the full AI solution lifecycle, from ideation and prototyping to production deployment
• Collaborate closely with engineering, product, and business teams to translate complex business needs into technical solutions
• Write clean, maintainable, and well-tested code
• Deploy and scale AI workloads using cloud platforms (Azure or GCP)
• Apply AI best practices to ensure fairness, transparency, reliability, and performance of ML systems

Additional Responsibilities for Senior Engineers

• Lead architecture and technical design decisions
• Drive the technical direction of AI initiatives
• Mentor and support other engineers within the team
• Evaluate, prototype, and introduce new AI technologies and approaches
• Contribute to engineering best practices and standards

Requirements

Essential Skills and Experience

• Strong software development experience in Python, particularly within the AI/ML ecosystem
• Experience with frameworks such as FastAPI, LangChain, or similar
• Knowledge of PostgreSQL and vector databases
• Experience designing microservices, APIs, observability solutions, and concurrent systems
• Hands-on experience with Azure or GCP
• Practical knowledge of containers, Kubernetes, and CI/CD practices
• Understanding of LLM architectures and working with domain-specific datasets
• Experience with RAG, prompt engineering, or agent-based AI architectures
• Solid understanding of Machine Learning, NLP, and Deep Learning concepts
• Experience working with TDD and/or BDD
• Strong English communication skills and the ability to explain technical concepts to non-technical stakeholders
• Familiarity with Java will be considered an advantage

Additional Requirements for Senior Candidates

• Experience leading technical projects and initiatives
• Proven track record in architecture and technology decision-making
• Mentoring and coaching engineers
• Driving innovation and experimentation in AI-powered systems

What We Offer

• Opportunity to work on advanced AI and LLM solutions addressing real business challenges
• Significant influence over architecture and AI strategy
• Collaboration within a highly skilled, high-impact engineering team
• Exposure to modern technologies across LLM, RAG, Machine Learning, and cloud infrastructure
• Stable yet innovative environment where AI solutions are delivered into production
• Hybrid working model with 2 days per week in the Kraków office
• The chance to design, build, and scale AI systems that create measurable business value

If you are passionate about building production-grade AI solutions-not just experimenting with models-and want to work on systems that make a real impact, we would love to hear from you.