Wizeline, a general 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.

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. Connect backend systems with modern LLM provider APIs (Open AI, Anthropic, Ollama, Hugging Face) using Java AI libraries like Lang Chain4j or Spring AI. Vector Search & RAG: Assist in integrating vector databases (e.
Collaboration & Testing: Write clean, testable code (JUnit/Mockito)



and collaborate with product managers, frontend engineers, and Dev Ops 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 (Postgre SQL, My SQL ) and ORM tools (Hibernate/JPA ). Familiarity with containerization (Docker ) and modern CI/CD workflows. Understanding of core LLM concepts (prompts, context windows, tokens, embeddings, and temperature). Open AI, Anthropic, Azure Open AI). Familiarity with at least one Java AI framework (Lang Chain4j or Spring AI ) or open-source vector stores. Nice-to-Haves Exposure to Python for prototyping or basic data processing. Experience with event-driven architectures (Apache Kafka, Rabbit MQ). Experience deploying applications on cloud platforms (AWS, GCP, or Azure).

What we offer
Commitment to Professional Development Flexible and Collaborative Culture Total Rewards *Specific benefits are determined by employment type and location. #

📌 Senior Backend Developer (España)
🏢 Wizeline
📍 España