HubMub
-
N-iX

Senior Java Engineer

N-iX
Poland · Full-time · Mid-Senior
We are looking for talented Senior Software Engineer to join our AI project in Europe.

The ideal person will have hands-on experience with multiple backend frameworks, databases, and tools, enabling them to adapt to different project requirements and contribute to the development of robust applications. We use Kotlin, Spring Boot and reactive programming to build a core AI agent framework/platform enabling internal teams to easily develop, deploy, and scale their own AI agents within a shared infrastructure. Our California-based customer is an American global e-commerce leader, one of the most popular and successful websites on the Internet. It provides platform services by connecting millions of sellers and buyers in more than 190 markets around the world.

Main Responsibilities:

  • Design and develop a robust and extensible Kotlin framework and platform for configuring and managing AI agents
  • Write clean, maintainable, and efficient code that complies with our coding standards
  • Ensure the performance, quality, and responsiveness of the framework/platform
  • Identify and correct bottlenecks and errors
  • Help to maintain code quality, organization, and automatization.
  • Create and maintain technical documentation for the framework/platform

Role Requirements:

  • At least 5 years of proficiency in Kotlin or Java
  • Deep experience with the Spring Framework
  • Reactive tools experience (Project Reactor)
  • Knowledge of different communication protocols such as REST, GraphQL, gRPC
  • Experience with distributed systems
  • Familiarity with tracing, metrics and monitoring best practices
  • Experience of creating frameworks and platform for other developers
  • Proficiency in Maven or similar tools
  • Familiarity with NoSQL databases
  • Very good spoken and written knowledge of English language (C1)

Nice to have:

  • Familiarity with GenAI, AI agents, machine learning, and natural language processing concepts is a plus
  • Experience with MCP, A2A, RAG is a big plus
  • Experience with event-driven architecture
  • Experience with Docker and Kubernetes
  • Python experience is nice to have
  • BSc or MSc in Computer Science, Engineering or relevant field

We offer*:

  • Flexible working format - remote, office-based or flexible
  • A competitive salary and good compensation package
  • Personalized career growth
  • Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
  • Active tech communities with regular knowledge sharing
  • Education reimbursement
  • Memorable anniversary presents
  • Corporate events and team buildings
  • Other location-specific benefits
  • not applicable for freelancers

Key Skills

Ranked by relevance

ai kotlin natural language processing machine learning spring boot graphql docker nosql maven
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Country Guide

Poland

Fast-growing Central European IT hub

Posted
Jan 23, 2026
Type
Full-time
Level
Mid-Senior
Location
Cracow
Company
N-iX

Industries

Construction Software Development IT Services IT Consulting

Categories

Engineering

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