Wizeline, a global AI-native technology solutions provider, develops cutting-edge, AI-powered digital products and platforms. We partner with clients to leverage data and AI, accelerating market entry and driving business transformation. As a general community of innovators, we foster a culture of growth, collaboration, and impact.
With the right people and the right ideas, there’s no limit to what we can achieve.
Sounds awesome, right? Now, let's make sure you're a good fit for the role:
Key Responsibilities

About the Role

We are looking for a

Java Developer

with a foundation in core Java engineering and an eagerness to build modern, AI-powered applications. In this role, you will work on scaling backend microservices while leveraging emerging AI frameworks to integrate Large Language Models (LLMs), RAG (Retrieval-Augmented Generation) pipelines, and intelligent automation into our enterprise platform.
Key Responsibilities

Backend Engineering:

Design, build, and maintain scalable RESTful APIs and microservices using Java and Spring Boot.
AI & LLM Integration:





Connect backend systems with modern LLM provider APIs (OpenAI, Anthropic, Ollama, Hugging Face) using Java AI libraries like

LangChain4j

or

Spring AI .
Vector Search & RAG:

Assist in integrating vector databases (e.g., pgvector, Qdrant, Pinecone, or Milvus) to support intelligent search and contextual knowledge retrieval.
Collaboration & Testing:

Write clean, testable code (JUnit/Mockito) and collaborate with product managers, frontend engineers, and DevOps to ship AI-enhanced features.
Qualifications & Skills

7 years

of hands-on software development experience with

Java 17+ .
Strong experience with

Spring Boot , REST API design, and microservice architectures.
Experience with relational databases ( PostgreSQL ,

MySQL ) and ORM tools ( Hibernate/JPA ).
Familiarity with containerization ( Docker ) and modern CI/CD workflows.
Basic AI / LLM Knowledge:

Understanding of core LLM concepts (prompts,

📌 Senior Java (Madrid)
🏢 Wizeline
📍 Madrid