Senior Backend Consultant (Python&Java) with AI/ML skills (Kraków, PL, 30-302)

GFT Technologies SE; Kraków; Hybrid; PLN 172,000 - 220,000; Full time

Job summary

GFT Technologies SE is hiring an AI/GenAI engineer in Kraków on a hybrid B2B contract. You will build production-grade AI/GenAI solutions using Python and integrate with Java services in an enterprise ecosystem, emphasizing security, testing and governance.

You will design LLM-based capabilities, RAG pipelines, agentic workflows and secure APIs, while contributing to CI/CD pipelines and technical design decisions. Collaboration with architects, QA and operations is required.

Qualifications

• 4+ years of professional software engineering experience in Python and Java.
• Hands-on experience building AI and GenAI solutions.
• Knowledge of LLM capabilities, limitations and safe usage patterns.
• Experience with design of RAG solutions and agentic workflows.
• Experience with CI/CD pipelines and cloud platforms (Azure preferred).

Responsibilities

• Design and develop production-grade AI and GenAI solutions in Python.
• Build and integrate LLM-based applications and RAG pipelines.
• Develop secure APIs, microservices and integration components.
• Integrate Python solutions with existing Java services and enterprise platforms.
• Implement logging, monitoring, and tracing; ensure security and governance.

Skills

Python

Java

AI/GenAI

LLM capabilities

RAG pipelines

REST APIs

CI/CD pipelines

Azure

Tools

Spring Boot

Kubernetes

Containers

Service mesh

Job description

Type of contract: B2B contract

Salary range: 125-160 PLN/H

What will you do?

You will build production-grade AI and GenAI solutions using Python, contributing to a large-scale enterprise technology transformation. You will work on LLM-based capabilities, RAG solutions, agentic workflows and integrations with an existing Java-based ecosystem while ensuring high standards of security, testing, governance and operational resilience.

Your tasks

• Design and develop production-grade AI and GenAI solutions in Python


• Build and integrate LLM-based applications, RAG pipelines and agentic workflows


• Develop secure APIs, microservices and integration components


• Integrate Python-based solutions with existing Java services and enterprise platforms


• Evaluate and validate AI-generated outputs using measurable quality criteria


• Apply human-in-the-loop controls, traceability and auditability


• Contribute to technical design and architecture decisions


• Develop unit, integration, contract and automated evaluation tests


• Follow secure coding standards and AI governance requirements


• Contribute to CI/CD pipelines, quality gates and automated security checks


• Implement logging, monitoring, metrics and tracing


• Identify and resolve technical risks, dependencies and delivery blockers


• Support releases, production readiness and incident response


• Collaborate with architects, Tech Leads, QA, platform and operations teams


• Contribute to engineering standards and continuous improvement

Requirements

• 4+ years of professional software engineering experience in Python and Java


• Hands-on experience building AI and GenAI solutions


• Practical knowledge of LLM capabilities, limitations and safe usage patterns


• Experience designing and implementing RAG solutions


• Experience with agentic or tool-using AI workflows


• Experience with prompt engineering, evaluation and validation approaches


• Knowledge of AI governance, security, traceability and auditability


• Experience developing microservices and APIs


• Previous commercial experience with Java and Java-based enterprise systems


• Ability to understand, review and occasionally modify Java code


• Experience with relational databases such as PostgreSQL or Oracle


• Knowledge of schema design, transactional integrity and performance optimization


• Strong unit, integration and contract testing practices


• Experience with CI/CD pipelines and quality gates


• Hands-on experience with cloud platforms (Azure preferred)


• Knowledge of REST, messaging and event-driven integration patterns


• Experience making pragmatic technical decisions in complex enterprise environments


• Strong understanding of secure software development and operational resilience


• Openness to work hybrid from our client's office (Kraków) 6-8 days a month

Nice to have

• Previous strong hands-on Java and Spring Boot development experience


• Experience delivering solutions in regulated financial services


• Experience with Kubernetes, containers and service mesh technologies


• Knowledge of modern observability tooling


• Experience with performance engineering and resilience testing


• Experience with prompt and model version management


• Experience establishing AI-enabled SDLC practices


• Experience measuring the quality and productivity of AI-assisted development