Senior Fullstack Developer

October 1, 2026

Remote

Senior

Madrid

Worth knowing

English is required
C1 level

Description

Babel, a multinational technology consultancy, is hiring a Senior Fullstack Developer with a strong backend focus to work across different repositories within the SIBBAC environment. The role covers backend services built with Java and Spring Boot alongside a React.js frontend, using event-driven architectures and Kafka integrations. The engineer will also evolve legacy code, contribute to architecture decisions and support production stability together with Product, QA and other engineering teams.

Responsibilities

Design, develop and maintain backend services with Java and Spring Boot
Develop end-to-end functionality from backend APIs to the React frontend
Work with event-driven architectures and Kafka-based integrations
Analyze and evolve legacy code while minimizing business impact
Assess regression risks before implementing changes and define safe deployment strategies
Participate in architecture decisions, code quality and technical debt reduction
Collaborate with Product, QA and other engineering teams
Contribute to production environment stability through debugging, monitoring and incident resolution

Requirements

More than 4 years of experience with Java and Spring Boot
Advanced level of Java
Advanced level of Spring Boot
Advanced experience with REST APIs
Advanced experience with JPA (Java Persistence API)
Advanced experience with JDBC
Advanced experience with React.js
Experience with Kafka and event-driven architectures
Knowledge of SQL
Experience working with complex systems and legacy code
Ability to analyze the impact of changes and minimize regression risks
Minimum English level C1, mandatory for oral and written communication with the team
Experience with OpenShift (desirable)
Experience in environments with multiple repositories and integrated systems (desirable)
Knowledge of software architecture, code quality and technical debt reduction (desirable)

Conditions

Work-life flexibility with a point-based vacation system, teletrabajo and flexible hours
Investment in training and professional development for employees
Private medical insurance, life insurance, personal trainer and wellbeing program
Free time perks including nature activities, sports championships and streaming subscriptions
Profit-sharing bonus (Bono de Beneficios)
Work with latest technologies on innovative digital transformation projects

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