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AI Engineering Lead – GenAI & Legacy Modernization
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Offer summary

(Summary generated by AI based on the full job description)

The project involves modernizing financial systems using Generative AI, LLM, Agentic AI and technologies like Python, LangChain, LlamaIndex. Key responsibilities include AI architecture design, code analysis automation and legacy system migration. Technical leadership with proven experience in AI, RAG, development and integration of enterprise AI solutions is required. The offer includes medical care and sports cost sharing.

newquick applyyou can start ASAP

AI Engineering Lead – GenAI & Legacy Modernization

Company: SQUARE ONE RESOURCES sp. z o.o.

from: 14 September 2026
to: 14 October 2026
170 - 190 złnet (+ VAT)/ hr.B2B contract (full-time)
Offer parameters
level:lead
working mode:remote
Warszawa, Mokotów
Warszawa, MokotówPuławska 2View on map

Requirements

Expected technologies

Python
LangChain
Llama
Azure DevOps
OpenAI API

Optional technologies

Python
LangChain
Llama
Azure DevOps
OpenAI API

Our requirements

  • Proven experience in technical leadership of AI/GenAI projects.
  • Strong hands-on experience with Generative AI and LLMs.
  • Strong knowledge of LLM architecture, RAG and Prompt Engineering.
  • Practical experience with Agentic AI / AI Agents.
  • Strong Python development skills.
  • Experience with LangChain and/or LlamaIndex.
  • Experience with OpenAI models and Azure AI Services.
  • Experience working with vector databases and embeddings.
  • Experience with legacy system modernization or software transformation.
  • Strong understanding of enterprise and solution architecture.
  • Ability to lead technical teams while remaining hands-on.

Your responsibilities

  • Lead the technical delivery of GenAI modernization solutions.
  • Design LLM and RAG architectures for enterprise use cases.
  • Design and implement Agentic AI solutions and workflows.
  • Define AI solution architecture, technical standards and integration patterns.
  • Lead development of AI-assisted code analysis and legacy modernization tools.
  • Support legacy system reverse engineering using AI-based approaches.
  • Develop solutions for business rule extraction from legacy systems and source code.
  • Oversee the development of AI modernization accelerators and automation frameworks.
  • Guide AI Engineers in the implementation of Python-based GenAI solutions.
  • Evaluate and select appropriate LLM models, frameworks and vector databases.
  • Ensure scalability, security, reliability and maintainability of enterprise AI solutions.

About the project

We are supporting a large-scale modernization program for a leading financial services organization, bringing together Generative AI, legacy/mainframe modernization, cloud transformation, data migration, and modern software architecture.
The AI stream focuses on using GenAI, LLMs and agentic solutions to accelerate legacy modernization, including automated code analysis, business rule extraction, reverse engineering, source-to-target conversion, and automated test generation.
The project offers the opportunity to work on complex enterprise-scale transformation initiatives, combining hands-on AI engineering with modern architecture and legacy system modernization.
Project details:
Industry: Financial Services
Location: Remote
Duration: 9–12 months
Start: ASAP / by agreement

This is how we organize our work

This is how we work

at the client's siteyou develop the code "from scratch"you focus on product development
Company

What we offer

  • Duration: 9–12 months
  • Workload: Full-time
  • Start: As soon as possible / by agreement
  • 100% remote
  • Medicover
  • Medicover Sport

Benefits

  • sharing the costs of sports activities
  • private medical care

Recruitment stages

  • 1.
    Initial recruiter screening
  • 2.
    1st technical interview
  • 3.
    2nd technical interview
  • 4.
    Decision

SQUARE ONE RESOURCES sp. z o.o.

At Square One Poland we link IT experts with the business. With over 25 years of experience, we specialize in recruitment processes on a global scale. Despite years of experience, we still have a startup DNA and this is our advantage. Our offices are located in London and Warsaw, however, we can reach clients from all over the world, from start-ups to big worldwide corporations.

This is how we work

AI Engineering Lead – GenAI & Legacy Modernization
170–190 zł / hr. (B2B)
I apply to:
SQUARE ONE RESOURCES sp. z o.o.
Warszawa, Mokotów

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