Senior Java Backend Engineer - LLM & AI Microservices

Wizeline; Barcelona; In loco; EUR 65.000 - 90.000; Tempo pieno

Vantaggi offerti da questo lavoro

Commitment to Professional Development

Flexible and Collaborative Culture

Total Rewards

Descrizione del lavoro

Wizeline is seeking a Java Developer to design, build, and scale backend services in a modern AI-powered platform. You’ll work with Java 17+, Spring Boot, and microservices, accelerating AI features for an enterprise-grade product.

You will integrate LLM providers, vector stores, and RAG pipelines, collaborating with product, frontend, and DevOps teams to deliver robust, testable software and reliable backends.

Competenze

• 7 years of hands-on software development experience with Java 17+.
• Strong experience with Spring Boot, REST API design, and microservice architectures.
• Experience with PostgreSQL, MySQL, and ORM tools like Hibernate/JPA.
• Familiarity with containerization Docker and modern CI/CD workflows.
• Understanding of core LLM concepts and REST-based AI APIs (OpenAI, Anthropic).
• Familiarity with LangChain4j or Spring AI or similar Java AI frameworks.
• Basic understanding of RAG (Retrieval-Augmented Generation) and vector stores.

Mansioni

• Design, build, and maintain scalable RESTful APIs and microservices using Java and Spring Boot.
• Connect backend systems with modern LLM provider APIs using Java AI libraries like LangChain4j or Spring AI.
• Assist in integrating vector databases (pgvector, Qdrant, Pinecone, Milvus) to support intelligent search and knowledge retrieval.
• Write clean, testable code (JUnit/Mockito) and collaborate with product managers, frontend engineers, and DevOps to ship AI-enhanced features.

Conoscenze

Java 17+

Spring Boot

REST API design

Microservices

JUnit/Mockito

PostgreSQL

MySQL

Hibernate/JPA

LangChain4j

Spring AI

OpenAI APIs

Strumenti

Docker

LangChain4j

Spring AI

Descrizione del lavoro

Wizeline is seeking a Java Developer to design, build, and scale backend services in a modern AI-powered platform. You’ll work with Java 17+, Spring Boot, and microservices, accelerating AI features for an enterprise-grade product.

You will integrate LLM providers, vector stores, and RAG pipelines, collaborating with product, frontend, and DevOps teams to deliver robust, testable software and reliable backends.