Senior AI Engineer (f/m/x)

Sii Poland; Katowice; Hybrid; PLN 180,000 - 320,000; Full time

Benefits offered by this job

Centre of internal trainings

Profit sharing

Open management team

Medical care

MySii app

Job summary

Sii Poland is seeking an experienced AI/ML Engineer to join a long-term project for a global banking leader. You will design and deploy scalable AI/ML solutions, collaborating with international teams to transform credit and lending for corporate clients. Occasional on-site visits to Kraków are expected as part of a global delivery model.

The role emphasizes RAG, vector databases, and responsible AI practices, with a strong focus on production-grade systems and cross-functional collaboration.

Qualifications

• 5+ years of experience in software or ML engineering.
• Proficiency in Python and its ML/AI ecosystem.
• LLM architectures and fine-tuning on domain data.
• Experience with Retrieval-Augmented Generation (RAG) and prompt engineering.
• Strong English communication and presentation skills.

Responsibilities

• Write, test, and maintain high-quality, reusable code.
• Lead design of scalable AI/ML solutions aligned with platform vision.
• Own engineering execution from design to production deployment.
• Champion coding standards and AI best practices for fairness and transparency.
• Evaluate new technologies (RAG, LLM optimization, agentic architectures).
• Collaborate with stakeholders to translate requirements into technical solutions.
• Develop solutions using RAG and vector databases to extract insights from financial data.

Skills

Python

ML/AI development

English communication

Leadership

Architectural design

TDD/BDD

RAG

LLM fine-tuning

Translating requirements to tech

Tools

Azure

GCP

Kubernetes

CI/CD tools

Redis

Vector databases

Job description

We are looking for an experienced AI/ML Engineer to join a long-term project delivered for a global leader in the banking sector. As part of a highly skilled international team, you will contribute to the development of innovative AI and Machine Learning solutions, transforming the Credit & Lending area for corporate and institutional clients worldwide. This role offers the opportunity to work in a stable yet fast-paced environment, where collaboration, innovation, and continuous learning are strongly valued. You will cooperate closely with business stakeholders and engineers across multiple global locations to deliver impactful, production-grade solutions. If you are passionate about applying modern AI technologies to solve complex real-world challenges, this opportunity may be the right fit for you.

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

Your tasks

• 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

Job no. JOB-JRRDE

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.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care