Senior Java Engineer

Nix

Poland (Europe) Remote permanent

Posted: March 16, 2026

Required Skills

Job Description

We are looking for talented Senior Java Engineer to to join our AI project in Europe..

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.

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

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

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