Senior AI Engineer (f/m/x)

Sii Poland; Kraków; On-site; PLN 260,000 - 380,000; Full time

Benefits offered by this job

Great Place to Work

Profit sharing

Medical care

Centre of internal trainings

Many experts you can learn from

Open management team

Regular integration events and trips

Comfortable offices

MySii app

Job summary

Sii Poland seeks an experienced AI/ML Engineer to join a long-term banking-sector project. You will craft production-grade AI/ML solutions, lead design, and own significant execution from design to deployment. Occasional client visits in Kraków (approx.

4 times monthly) are required, with a strong emphasis on scalable, fair, and transparent AI practices. Ideal candidates bring 5+ years in software/ML, deep Python knowledge, and experience with LLMs, RAG, vector DBs, and cloud platforms (Azure or

Qualifications

• Minimum 5 years of experience in software or ML engineering.
• Deep expertise in Python and its ML/AI ecosystem.
• Experience with relational and vector databases, and KV stores like Redis.
• Strong grasp of microservices, observability, API design, and concurrency.
• LLM architectures and fine-tuning on domain data.
• Experience with RAG, prompt engineering, and agentic architectures.
• NLP, ML/DL knowledge; Azure or GCP, containers, Kubernetes, CI/CD tools.
• Proficiency in TDD/BDD and strong English communication.
• Residing in Poland required.

Responsibilities

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

Skills

Python

LLM architectures

Retrieval-Augmented Generation

RAG

Microservices architecture

API design

Kubernetes

CI/CD

Azure

GCP

TDD/BDD

English communication

Tools

Redis

Vector databases

Pub/Sub

Jenkins

Azure DevOps

GCP Cloud Build

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), 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