Lead Backend Engineer with AI/ML skills

GFT TECHNOLOGIES SE; Kraków; Hybrid; PLN 23,000 - 35,000; Full time

Benefits offered by this job

Hybrid Kraków office

Training & certifications

Medical & life insurance

Lunch subsidy

Job summary

GFT Poland is seeking a Lead Backend Engineer with AI/ML skills to join a large enterprise transformation project in Kraków. You will design, develop, and support Java microservices, leverage Python in enterprise-scale contexts, and drive AI-enabled software development lifecycles.

Hybrid work is available with collaboration across architects, QA, SRE, and platform teams. The role requires deep experience in Java microservices (Spring Boot), CI/CD, cloud (Azure), database expertise

Qualifications

• At least 8 years of professional software engineering experience.
• Hands-on Python development in enterprise-scale environments.
• Strong knowledge of Oracle or PostgreSQL databases.
• Experience with Java microservices based on Spring Boot.
• CI/CD pipelines with Jenkins or GitLab.
• Experience with Azure cloud services.
• Understanding of REST APIs and event-driven architectures.
• Experience with automated testing (JUnit, Mockito, Testcontainers).
• GenAI familiarity and AI governance experience.

Responsibilities

• Build, test, release, and support Java microservices and related components.
• Contribute to solution design and integration patterns aligned with target architecture and non-functional requirements.
• Identify and help resolve technical risks, dependencies, and delivery blockers.
• Follow and contribute to engineering standards, CI/CD practices, and quality controls.
• Deliver robust unit, integration, and contract testing.
• Participate in design reviews, code reviews, and security reviews.
• Use AI-assisted engineering tools while maintaining security, quality, and governance standards.
• Apply GenAI development practices including LLM usage, RAG concepts, and agent-based workflows.
• Build production-ready services with strong observability and operational readiness.
• Support release activities, integrations, and environment readiness.
• Collaborate with engineering, architecture, QA, platform, and operations teams.
• Contribute to continuous improvement initiatives and engineering excellence.
• At least 8 years of professional software engineering experience.

Skills

Java

Python

Spring Boot

REST APIs

CI/CD

Jenkins

GitLab

Azure

GenAI

LLM concepts

Security by design

Tools

Oracle DB

PostgreSQL

Testcontainers

Kubernetes

Job description

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Lead Backend Engineer with AI/ML skills

Date: Sep 14, 2026

Location: Kraków, PL, 30-302

Working place: Hybrid

Type of contract: Employment contract

Salary range: 22500-34500 PLN gross

What will you do?

You will join a large-scale enterprise transformation initiative focused on modernizing and enhancing critical business applications. In this role, you will design, develop, integrate, and support enterprise-grade Java microservices while contributing to an AI-enabled software development lifecycle. You will work closely with architects, Tech Leads, QA, SRE, and platform teams to deliver secure, scalable, and resilient solutions in a complex, highly regulated environment.

• Build, test, release, and support Java microservices and related components
• Contribute to solution design and integration patterns aligned with target architecture and non-functional requirements
• Identify and help resolve technical risks, dependencies, and delivery blockers
• Follow and contribute to engineering standards, CI/CD practices, and quality controls
• Deliver robust unit, integration, and contract testing
• Participate in design reviews, code reviews, and security reviews
• Use AI-assisted engineering tools while maintaining security, quality, and governance standards
• Apply GenAI development practices including LLM usage, RAG concepts, and agent-based workflows
• Build production-ready services with strong observability and operational readiness
• Support release activities, integrations, and environment readiness
• Collaborate with engineering, architecture, QA, platform, and operations teams
• Contribute to continuous improvement initiatives and engineering excellence
• At least 8 years of professional software engineering experience

Strong hands-on experience with Python development in enterprise-scale environments

Good practical knowledge of Java and experience working with Java microservices based on Spring Boot

• Experience working in enterprise-scale environments
• Strong knowledge of Oracle or PostgreSQL databases
• Experience with schema design, performance optimization, and transactional systems
• Strong unit and integration testing experience using tools such as JUnit, Mockito, and Testcontainers
• Experience with API and contract testing
• Hands-on experience with Azure cloud services
• Experience with CI/CD pipelines and quality gates
• Knowledge of Jenkins or GitLab
• Understanding of Sonar, SAST, DAST, and dependency scanning
• Strong understanding of REST APIs, messaging, event-driven architectures, and integration patterns
• Experience contributing to technical design decisions and architectural discussions
• Leadership experience and strong collaboration skills
• Practical exposure to GenAI tools and software engineering use cases
• Understanding of LLM concepts, RAG patterns, AI governance, and engineering controls
• Knowledge of secure coding practices and security-by-design principles

Nice to have

• Experience in financial services or other highly regulated industries
• Knowledge of containers and Kubernetes
• Exposure to service mesh technologies
• Experience with observability platforms, logging, metrics, and tracing
• Experience with performance engineering and resilience testing
• Previous experience implementing AI-enabled SDLC practices
• Hands-on experience building RAG solutions or integrating GenAI capabilities
• Experience with prompt engineering, evaluation frameworks, or AI governance controls

We offer

• Hybrid work in our client's office (Kraków) 6-8 days a month
• Working in a highly experienced and dedicated team
• Benefit package tailored to your needs (medical, sport, lunch subsidy, life insurance, etc.)
• Online training and certifications
• Access to e-learning platform
• Social events

We are GFT Poland. WE KNOW how to tackle complex issues with innovative approach to deliver the highest value. Our reputation has been built around one simple rule: we do not overpromise, WE DELIVER. We deliver to our employees, clients and partners. WE GROW as you grow, so investing in you is our business strategy. Caring for each other is our priority. WE CARE who you are, what you need, how you feel. WE CARE to smile, have fun and develop as human beings.

Why Choose GFT?

• A culture of top performance
• Deep tech IT engineering & consulting
• 1200 skilled & top-class experts
• 77% of the team are regular/senior
• Products that contribute to a sustainable world
• Competitive salary and benefits
• Ambitious projects, trainings and tools you need to flourish
• Google Cloud Partner of the Year - for going above and beyond for customers