Senior AI Engineer (f/m/x)

About the Position

We are seeking a Senior AI Engineer to join our team and contribute to innovative AI and Machine Learning solutions for the banking sector. As part of a highly skilled international team, you will work on a long-term project for a global leader in the banking sector. This role offers the opportunity to work in a stable yet fast-paced environment, where collaboration, innovation, and continuous learning are strongly valued.

The role requires occasional visits to the client’s office in Kraków, approximately 4 times per month.

Responsibilities

• Write and maintain exemplary, high-quality, testable, and reusable code
• Lead the design of AI/ML solutions, ensuring they are scalable, robust, and aligned with the platform's vision
• Own the engineering execution for significant parts of our AI flagship projects, from technical design through to production deployment
• Co-author and champion coding standards and AI best practices to ensure fairness, transparency, and accountability across our models
• Co-drive technical strategy by evaluating and prototyping new technologies, such as advanced RAG techniques, LLM optimization, and agentic architectures
• Collaborate extensively with stakeholders across the AI Programmes, translating business requirements into technical solutions and communicating complex ideas to diverse audiences
• Develop and implement sophisticated solutions using Retrieval-Augmented Generation (RAG) and vector databases to unlock insights from complex financial data

Requirements

• Minimum 5 years of experience in software or ML engineering
• Deep expertise in Python and its ML/AI ecosystem
• Familiarity with relational databases, vector databases, KV stores (Redis), and Pub/Sub
• Strong command of microservices architecture, observability, API design, and concurrency models
• Expert-level understanding of LLM architectures and extensive experience fine-tuning models on domain-specific data
• Hands-on mastery of Retrieval-Augmented Generation (RAG), advanced prompt engineering, and designing agentic architectures
• In-depth knowledge of machine learning, deep learning, and NLP
• Proficiency with Azure or GCP, containers, Kubernetes, and CI/CD tools, e.g., Jenkins, Azure DevOps, GCP Cloud Build
• Practical experience in TDD and BDD
• Exceptional presentation and communication skills in English
• Residing in Poland required

Nice to Have

• Leadership or architectural experience
• Familiarity with Java for occasional middleware and integration tasks

We Offer

• Opportunity to work on innovative AI and Machine Learning solutions
• Collaborative and inclusive work environment
• Continuous learning and professional development opportunities
• Competitive compensation package

About the Company

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.