European Union

Work type:
Office/Remote

Technical Level:
Senior

Job Category:
Software Development

Project:
American multinational e-commerce company

We are looking for talented Senior Java Engineer to join our team .

Our California-based customer is an American integral 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.

The Senior Java Engineer will be a part of the AI Core team to bring new experiences for sellers and buyers leveraging Machine Learning models and other Artificial Intelligence tools to maximize the fun and accuracy of shopping experience.

Main Responsibilities:
Design, build, and maintain efficient, reusable, and reliable code
Suggest technical and functional improvements to add value to the product
Conduct design and code reviews to deliver high quality product

Minimum 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

Professional growth:
Strong engineering culture
Challenging projects and mature teams
Personalized on-demand cross-company mentoring support enabling you to learn new things faster
Plenty of opportunities to share knowledge and get more experience such as opportunity to mentor others, speak at events, and contribute to pre-sales
Direct communication with the customer

📌 Senior Java Engineer (España)
🏢 N-iX
📍 España