Senior Backend Software Engineer (Java/Spring)

About the role

ALEA is looking for a skilled Backend Engineer to join its engineering team in Barcelona. The role builds scalable, robust software solutions for a B2B application using modern development practices, taking part in high-level technical decisions, mentoring colleagues and helping the team grow as the company expands.

Key responsibilities

• Design and develop scalable, efficient and high-quality backend systems for the B2B application.
• Follow agile methodologies to deliver features iteratively and quickly.
• Take part in architectural decisions, ensuring scalability, performance and security.
• Mentor and guide other developers and foster knowledge sharing.
• Make sure the technology stack and systems can scale with business growth.

Required profile

• Minimum of 5 years of software engineering experience focused on backend development.
• Degree in Computer Science, Engineering or a related field.

Required skills

• Strong Java with deep knowledge of the JVM, including memory management and profiling.
• Spring Framework (Spring MVC, Spring Security, Spring JPA).
• Object-oriented programming, SOLID principles, Clean Architecture and design patterns.
• Relational databases, performance tuning and optimization; test-driven development.
• Cloud environments (IaaS and PaaS, especially AWS) and DevOps practices.

What we offer

• Competitive salary and a benefits package focused on integral health: medical insurance, gym with personal trainer, sauna and hyperbaric chamber, and fresh fruit daily.
• Tax-advantaged meal card, transport package, childcare allowance and discount on office vegan meals.
• Flexible start and finish times, reduced hours in August, 23 holidays plus 3 extra days.
• Hybrid work model, English classes, parking benefit for those living outside Barcelona, and team building events and activities.