Senior AI Developer

Join a team building enterprise-scale AI and data solutions that help transform complex data into real business value. As a Senior AI Developer you’ll design and develop AI-powered applications using Large Language Models, RAG architectures and tool integrations.

What you will do:

• Deliver AI and data product initiatives end-to-end, from solution design through build, testing, release and post-launch support, aligned with business goals
• Design, build and maintain data products and curated datasets that support AI, LLM and RAG use cases
• Develop and support LLM-powered applications, including RAG pipelines, embeddings, retrieval mechanisms, grounding/citations and tool integrations
• Create and maintain prompts, conversation flows, reusable templates, system instructions and structured outputs, including prompt testing and version control
• Define and execute AI quality and evaluation frameworks covering accuracy, groundedness, safety, latency and cost, using automated testing and release controls
• Implement AI guardrails, secure data handling practices and governance controls to ensure compliance with security and risk requirements
• Build and maintain reliable data pipelines, including data profiling, transformation, enrichment and validation for AI-ready datasets

• Client: lead international bank
• Recruitment process: one on-line meeting with the Client, followed by a phone screen with our recruiter
• Hybrid work: 6 days per month from the office in Cracow

Skills

• Experience delivering AI and data products end-to-end in enterprise environments, from requirements through deployment and support (2+ years)
• Proficiency in Python and/or TypeScript, with experience working with APIs, JSON and integration patterns
• Hands-on experience building LLM-based solutions, including RAG architectures, retrieval pipelines, grounding, citations and tool integrations
• Prompt engineering and conversational AI design skills, including structured outputs, prompt templates and testing/versioning
• Experience defining AI evaluation frameworks and quality metrics covering accuracy, groundedness, safety, latency and cost with a data-driven approach
• Solid data engineering foundations
• Practical experience with cloud-based AI and data platforms (e.g. Google Cloud or Azure)

What's in it for you?

• Prestigious position at one of the world's largest banks
• Stable, long-term projects
• Hybrid work (6 days per week from the office in Cracow)
• Working with modern IT technologies
• Possibility to move between projects
• Private healthcare, multisport card
• Referral program and free parking