Senior Java Developer

We're looking for an experienced Senior Software Engineer to join our team in Barcelona. You’ll play a key role in designing, building and maintaining high-quality backend solutions that power our products.

The role offers the opportunity to work with modern Java frameworks (including Spring, Spring Boot, Vert.x) as well as Ruby on Rails. While prior experience with Ruby on Rails is not required, a strong willingness to learn and work with it is essential.

To succeed in this role, you’ll need a solid Java development background, a collaborative mindset, and a drive for delivering robust, scalable software.



This is a hybrid role requiring 3 days per week in our Barcelona office.





First 90 days

• 30 days: Gain a deep understanding of Sage’s architecture, development practices and engineering standards. Meet your team and key cross-functional stakeholders.

• 60 days: Contribute to active development work, participate in sprint planning, and begin supporting junior engineers.

• 90 days: Take technical ownership of a service or component, contribute to product shaping discussions, and actively mentor others on the team.





Meet the team

You’ll join a collaborative cross-functional team of engineers, architects, QAs, BAs and product managers, working closely with colleagues around the world. Your line manager will be the Engineering Team Leader, who fosters autonomy, technical excellence and team accountability.



How success will be measured

• Quality and maintainability of the code you deliver

• Timely and consistent contribution to team goals and deliverables

• Thought leadership within the team, especially in mentoring and collaboration

• Contribution to product evolution including design and process improvement





Skills you’ll gain

• Deep technical knowledge of large-scale backend architecture

• Cross-functional collaboration in a mature agile environment

• Mentorship and leadership within a senior engineering team

• Experience with cloud-native development and automation tools

• Hands-on knowledge of Java-based technologies in production systems
Snapshot of your day-to-day

You’ll work with Java and frameworks such as Spring Boot and Vert.x, and occasionally with Ruby on Rails. You’ll participate in designing, technical planning, pair-programming, code reviews, and mentoring. You’ll support the product team with technical insight, ensure production stability, and continuously seek improvements in performance and architecture.



Qualifications

• Strong experience with Java and frameworks such as Spring, Spring Boot, or Vert.x

• Ruby on Rails experience is not required, but a willingness to learn and work with it is essential

• Strong experience with AWS

• A track record of delivering high-quality, production-grade software

• Solid understanding of software development principles and lifecycle

• Experience in delivering scalable, performant and resilient software

• Experience in agile methodologies (Scrum, XP, etc.)

• Excellent communication and collaboration skills

• Passion for mentorship and continuous learning

• Fluency in English; Spanish fluency is a plus



At Sage, we offer you an environment where you can grow professionally without compromising your personal well-being. Our benefits package is designed to provide stability, flexibility, and balance:

• Flexible benefits: exchange part of your salary and make tax savings on health insurance, meal and transport vouchers, childcare, and training.

• Well-being: Free access to the Calm app (for up to 5 users), 24/7 counselling, and emotional support from our Healthy Mind Coaches. We also offer self-care and parenting resources through the Cleo app.

• Flexible working: flexibility of working one hour in, one hour out, shortened workdays on Fridays and during the summer, and the opportunity to work from over 40 countries for up to 10 weeks per year through our Work Away program.

• Annual leave: 23 working days of vacation, 5 paid days per year for volunteering, and 5 additional paid days annually for personal or professional development.

• Extended leave: 7 extra days of maternity leave and 5 extra days of paternity leave, on top of the legal allowance, available after one year of service.

• Financial support: Life and disability insurance, salary advances of up to 3.5 times your net monthly pay, a €300 net marriage bonus, and access to Sage's employee stock purchase plan at a discounted rate.





Health and Safety Responsibilities

• Fostering the safety culture, by leading with your own example.

• Following established safety procedures and reporting potential hazards promptly helps maintain a secure and efficient workplace.

• Participating in safety training sessions and adhering to preventive guidelines and procedures, the objective is minimizing risks and protecting yourself and the rest of your colleagues.