Senior Backend Consultant (Python&Java) with AI/ML skills

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