Sr Java Backend Engineer en Madrid, España

About Us

Nalanda is a leading Spanish multinational dedicated to bridging the gap between large companies and their suppliers through an innovative digital platform. Our platform streamlines business processes such as document exchange, purchases, invoices, and vital business information. We specialize in coordinating activities between contractors and their suppliers, minimizing costs, time, and risks, while fostering transparent and effective business relationships.

We are a dynamic, forward-thinking company committed to building an inclusive workplace where talent thrives. At Nalanda, we believe that the development of people drives organizational success. Join us as we continue to build a culture of growth, inclusivity, and excellence.

We are also part of Once For All, an international group with a presence in the UK, France, Latin America, and more than 1,000 people working on digital solutions for supply chain management and regulatory compliance.

Role Summary

We are looking for a Sr Java Backend Engineer who will play a key role in designing and evolving our backend architecture, ensuring our systems are scalable, maintainable, and robust. You will join a product engineering team that works with modern development practices, AI-powered tooling, and a fast-evolving engineering culture.

In this role, you’re expected to take ownership of complex backend domains, drive technical initiatives, and make informed architectural decisions. You will mentor and support other engineers, influence engineering standards, and contribute to improving performance, reliability, and operational excellence across the platform.

Key responsibilities

• Design, build and maintain backend services, APIs and core platform components using Java and Spring Boot.
• Own complex technical problems end to end — from design through to production.
• Lead the design of scalable solutions and contribute to architecture decisions across databases, caching, messaging and distributed systems.
• Optimise services for performance, scalability, security and fault tolerance.
• Set the bar for code quality, testing, observability and documentation.
• Mentor Junior and Semi-Senior engineers through code reviews, design discussions and technical feedback.
• Keep production healthy: incident resolution, root-cause analysis, and identifying opportunities for refactoring and technical debt reduction.
• Use AI-powered development tools to improve delivery speed, code quality and team productivity.

Qualifications

• Solid experience with Java and Spring Boot, including the wider Spring ecosystem (Spring Data, Spring Web).
• A good grasp of backend architecture, distributed systems, concurrency and scalability patterns.
• Experience with SQL databases (PostgreSQL ideally).
• Comfortable designing and consuming REST APIs, with sensible error handling, versioning and documentation.
• A habitual testing practice — unit and integration tests (JUnit).
• Working knowledge of Git, CI/CD pipelines and Docker.
• Willingness and ability to mentor others and raise the technical quality of the team.
• Strong communication and decision-making skills.

Bonus points for

• Cloud platforms (AWS).
• Observability stacks (Dynatrace, OpenTelemetry).
• Event-driven architectures or messaging technologies (Kafka).
• Day-to-day use of AI coding assistants.

What we offer

• Flexible working time.
• Intensive working time in summer.
• Flexible benefits.
• A dynamic and inclusive workplace with opportunities for growth and development.
• The chance to make a significant impact on our organizational culture and talent strategy.
• Competitive compensation package, with a salary range of €50,000 – €60,000 gross per year , depending on experience and fit.