Senior AI Engineer - GenAI & Legacy Modernization

Square One Resources Limited; Warszawa; Hybrid; PLN 207,000 - 255,000; Full time

Job summary

Square One Resources Limited invites applications for a Senior AI Engineer specializing in GenAI and legacy modernization. The role is 100% remote, with a 9-12 month contract on a B2B basis.

You will work on a large-scale modernization program in financial services, implementing GenAI/LLM solutions and AI agents using Python and LangChain/LlamaIndex. Ideal candidates have strong GenAI/LLM experience, hands-on Python, and familiarity with OpenAI/Azure OpenAI, Azure AI Services, and vector

Qualifications

• Experience as an AI Engineer, GenAI/LLM
• Hands-on Python, LLMs, RAG and Prompt Engineering
• Experience with LangChain/LlamaIndex, OpenAI/Azure OpenAI and Azure AI Services
• Experience with legacy system modernization and code analysis

Responsibilities

• Design and implement GenAI/LLM solutions for modernization.
• Develop RAG-based applications and AI agents using Python and LangChain/LlamaIndex.
• Build AI-assisted code analysis, reverse engineering and business rule extraction solutions.
• Design source-to-target conversion accelerators and automated test generation frameworks.

Skills

GenAI

LLM

Python

Prompt engineering

LangChain

LlamaIndex

OpenAI

Azure AI Services

Legacy modernization

Code analysis

Tools

LangChain

LlamaIndex

OpenAI

Azure OpenAI

Azure AI Services

Vector databases

Python

Job description

Warsaw

Posted 9 days ago

Work Type

Contract

Remote Work

Yes

IR35 Status

Not Applicable

Position: Senior AI Engineer - GenAI & Legacy Modernization
Location: 100% remote
Salary: 150-185 PLN/h netto VAT
Start: As soon ass possible/negotiable
Contract: B2B, full-time, 9-12 months

We have an exciting opportunity with one of our clients operating in the financial services sector. We are looking for a talented AI Engineer with strong Generative AI and LLM experience to join a large-scale modernization program focused on transforming complex enterprise and legacy systems.

The program combines Generative AI, legacy and mainframe modernization, cloud transformation, data migration, and modern software architecture.

Tasks

• Design and implement GenAI/LLM solutions supporting legacy and enterprise system modernization.
• Develop RAG-based applications and AI agents using Python and LangChain/LlamaIndex.
• Build AI-assisted code analysis, reverse engineering and business rule extraction solutions.
• Develop source-to-target conversion accelerators and automated test generation frameworks.
• Design LLM/GenAI architectures using OpenAI models, Azure AI Services and vector databases.

Requirements

• Strong experience as an AI Engineer, GenAI Engineer, LLM Engineer or similar .
• Hands‑on experience with Python, LLMs, RAG and Prompt Engineering .
• Experience with LangChain/LlamaIndex, OpenAI/Azure OpenAI and Azure AI Services .
• Experience with legacy system modernization, code analysis or software transformation .
• Knowledge of LLM architecture, vector databases and enterprise AI solutions .

• 9-12-month project in the financial services sector.
• Opportunity to work with Generative AI, LLMs, RAG and Azure AI .
• Full-time B2B engagement, start as soon ass possible/negotiable.