Senior Backend Developer (Sant Joan Despí)

G+D makes the lives of billions of people around the world more secure. We shape trust in the digital age with built-in security tech in three segments: Digital Security, Financial Platforms and Currency Technology. We have been a reliable partner for our customers for over 170 years with our innovative solutions for SecurityTech! We are an international technology group and traditional family business with over 14,000 employees in 40 countries. Creating Confidence is our path to success. Trust is the basis of our collaboration within G+D. We are the reliable partner for all challenges resulting from the Internet of Things. We offer a complete connectivity portfolio for mobile network operators, automotive manufacturers, technology companies such as chip and module manufacturers as well as transport and logistics providers. Our portfolio includes highly secure solutions in the area of connectivity & IoT, from classic SIM, eSIM and iSIM, to the associated embedded operating systems and life cycle management, through to services for global connectivity and IoT solutions. Do you want to actively shape the digital transformation with us? We're seeking a Backend Software Developer with +5 years experience to join our team. You'll work hands-on with advanced Golang, distributed systems, and modern cloud technologies, supporting our ongoing growth and commitment to security, scalability, and reliability. Key Responsibilities
- Develop high quality, reusable, readable, testable, and maintainable code/libraries/modules.
- Participate in requirement analysis with solution architects and product managers.
- Take part in the definition of the overall system architecture and landscape.
- Implement functional and non-functional requirements (performance, security, etc.).
- Review and refactor code.
- Adopt and promote software development best practices.
- Mentor team members in all aspects of the SDLC. About You
- Solid understanding and hands-on experience with RESTful APIs.
- 3+ years of experience in backend systems or systems programming.
- 7+ years of experience with procedural, object-oriented, or functional programming languages.
- Proficiency with Git or similar distributed version control systems. Onboarding Plan – Your First 90 Days
- First 30 Days: Set up development environment, complete security and code review training, shadow senior developers, run builds/tests, and learn product architecture. Participate in Kanban flow and introductory TDD exercises. Join pair programming and understand CI/E2E testing pipelines.
- Days 31-60: Make your first contributions with guidance, join workshops on secure coding (OWASP), practice TDD, participate in pair programming, use E2E tests, contribute to CI/CD, take ownership of a Kanban ticket, and write feature/test documentation.
- Days 61-90: Deliver features end-to-end, patch a medium-level security issue, lead or join security retrospectives, optimize part of the CI/CD workflow, ensure secure feature delivery, refine Kanban/process metrics for backend releases, mentor newcomers, and document lessons learned and improvements. We're looking for proactive developers who care about security, teamwork, and continuous improvement. If you're ready for autonomous and impactful work, this is the place for you! What’s great about working with us:
- Culture and diversity: Join a people-oriented environment with different nationalities and a great team spirit, flat hierarchies (everyone speaks to everyone). Equal Opportunity Employer and LGBT+ friendly.
- Team: An opportunity to shape our engineering culture and work with a passionate, mission-driven team. Collaboration with a diverse and very international team of outstanding people.
- Global Collaboration: Work collaboratively with stakeholders around the globe.
- Impactful Work: You will have the opportunity to participate in and shape a global lighthouse project in the domain of digital currencies.
- Career Development: Benefit from continuous training, coaching, and talent development programs.
- Social Benefits: Versátil compensation (transport tickets, training, private insurance), etc.
- Own canteen: Take a break with our breakfast and lunch service: choose between a wide range of menus, salad desk, and sandwiches service. Nicely priced!
- Work-Life Balance: Flexible working hours with the option for remote work (Mon–Thu 8:30 – 17:30 and Fri 8:30 – 15:30; 3 days of remote work).
- Location: Sant Joan Despí. Easily accessible by public transport. A look behind the scenes Contact HR Team Spain JOB OFFER Job Details Job Title

Senior Backend Developer Business Sector Giesecke + Devrient Mobile Security TCD Iberia S.L. Av. Baix Llobregat 3 5 08970 Sant Joan Despí B Requisition ID 26614 Location Sant Joan Despí (BCN), ES Career level Experienced and Graduates Job Type Fulltime, Permanent

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We are an equal opportunity employer! We promote diversity in all its forms and create an inclusive work environment, free from prejudice, discrimination and harassment, in which all employees feel a sense of belonging. We warmly welcome all applications regardless of gender, age, race or ethnic origin, social and cultural background, religion, disability and sexual orientation. Postúlate en Kit Empleo: kitempleo.es/empleo/6u8pmu