About the job

📍 Location: Spain (100% Remote)

🔍 Seniority: Senior

🛠️ Position: FULLSTACK JAVA DEVELOPER

We are looking for a Senior Fullstack Java Developer to join one of our clients through an established international IT and business consulting company, with decades of experience delivering large-scale technology and organizational projects across multiple industries.

You will work for a leading company in the energy sector, contributing to the development of modern, scalable, and mission-critical systems. The projects focus on cloud-native architectures, event-driven systems, and high-performance platforms that support core energy operations.

👷 About the Role

We are looking for a Senior Fullstack Java Developer with a strong backend focus who is motivated, collaborative, and comfortable working in modern, reactive environments.

You will be involved across the full software lifecycle, working closely with agile teams to design and implement tailor-made solutions for complex business processes in the energy domain.

As a Fullstack Java Developer, you will:

✔ Design, develop, and maintain complex client-facing and backend applications

✔ Work across the full technology stack, from frontend integration to backend services and cloud environments

✔ Build reactive and event-driven systems using modern Java and Spring technologies

✔ Collaborate in agile, cross-functional project teams to deliver customized software solutions

✔ Translate business requirements and processes into robust technical implementations

✔ Ensure high standards of code quality, scalability, performance, and reliability

💡 Required Skills & Tech Stack

We value technical excellence, attention to detail, and a proactive mindset. The ideal candidate brings strong experience in the following areas:

🔹 Extensive experience with Spring Boot, including Spring WebFlux, reactive Kafka Streaming, WebSocket, and Kafka Reactive Binder

🔹 Strong expertise in database integration, especially PostgreSQL, Hibernate, JDBC, and R2DBC for reactive data processing

🔹 Solid experience with event-driven architectures, including Kafka as a message broker

🔹 Experience integrating Kafka with Spring Boot (e.g. Spring Cloud Stream)

🔹 Hands-on experience with cloud-native and containerized deployments, including Kubernetes, CI/CD pipelines, and Terraform

🔹 Ability to deliver clean, scalable, and reliable software within modern reactive technology stacks

🔹 Strong attention to detail and commitment to high-quality delivery

🔹 Excellent communication and interpersonal skills

🔹 Nice to have:

Experience with time-series data processing and time-series databases
Interest in modern development practices and AI-supported tools, with awareness of data protection and compliance requirements
Very good English skills (German is a plus)

🌟 What We Offer

✔ Salary range 45k–55k € + 10–15% bonus

✔ 100% remote work

✔ Flexible working hours to support work-life balance

✔ Personalized professional development aligned with your strengths and project interests

✔ Flat hierarchies and a high degree of autonomy

✔ Access to continuous learning platforms and training resources

✔ Long-term projects in the energy sector, working on impactful and business-critical systems

💬 If you’re interested in building modern, reactive software solutions for the energy sector while enjoying full flexibility and long-term growth, we’d love to hear from you.

4 Java Devloper (Remote)