Wizeline, a integral 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 global 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 (Barcelona)
🏢 Wizeline
📍 Barcelona