Mobile Developer Engineer

Location: Stellen-ID: 27127 G+D makes the lives of billions of people around the world more secure. We create trust in the digital age with integrated security technologies in three business areas: 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 co-operation 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 are looking for a Mobile Developer Engineer to join our team in Barcelona. In this role, you will be responsible for the end-to-end development of secure, high-quality mobile SDKs and applications for Android (Kotlin) and/or iOS (Swift), with opportunities to contribute across both platforms. The role emphasizes security, code quality, testing best practices, and collaboration. Key Responsibilities Design, develop, and maintain native mobile SDKs/libraries (Kotlin, Swift). Design, develop, and maintain native mobile applications to showcase these SDKs. Participate in code reviews, pair programming, and contribute to TDD and E2E testing. Work with hardware features such as secure elements and NFC. Integrate with RESTful APIs and collaborate with backend teams. Set up and master CI/CD tools, participate in secure code reviews, and contribute to documentation. Follow Scrum project workflows and engage in daily standups. Deliver features from ideation to deployment, maintaining security and compliance. Troubleshoot and optimize the CI/CD pipeline for quality and speed. Must-Have Qualifications Proficient in native Android (Kotlin) and/or iOS (Swift) development. Willingness to assist across both platforms if needed. Experience with mobile development tooling (IDEs, test frameworks, emulators). Nice-to-Haves Cross-platform experience (Flutter preferred). Familiarity with hardware features (NFC, BLE), developing mobile libraries, or native code integration. Understanding of Docker, Figma-based UI implementation, Rust, smart cards, secure elements, or byte-level debugging of binary protocols. Ideal Candidate You write secure, test-driven code, enjoy collaborating with teammates, mentor others, and are comfortable exploring new tools and technologies in a fast-paced mobile environment. What will you do on your first 90 days Days 0-30: Orientation & Foundations Get familiar with company culture and security basics. Attend intro sessions in password policies, secure code review, incident response. Configure your development environment (IDEs, emulators, libraries, CI tools). Run local builds for iOS, Android, and backend. Review key security policies and study product user flows, architecture diagrams, API specs. Shadow senior developers and join product demos. Days 31-60: Deepening Skills & First Contributions Participate in workshops on secure coding and best practices (OWASP Mobile top risks). Write code using TDD for small features and bugfixes. Engage in pair programming with a mentor focused on security and test cases. Get hands-on with E2E tests, CI/CD mastery, and contribute. Take ownership of a real ticket and participate in a security code review. Document your features or tests. Days 61-90: Autonomous & Secure Contribution Own delivery of a feature end-to-end (from coding, TDD, peer review, E2E, to deployment). Fix a medium-level security issue in the codebase and propose new tests. Lead a security retrospective or sharing session. Optimize part of the CI/CD workflow (caching, deployment automation, test speed). Mentor newcomers on secure coding basics. Help refine Scrum processes and share lessons learned through onboarding documentation. 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: Flexible 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. $$ We are an equal opportunity employer! We promote diversity in all its forms and create an inclusive work environment, free from prejudice, discrimination and harassment, in which all employees feel a sense of belonging. We warmly welcome all applications regardless of gender, age, race or ethnic origin, social and cultural background, religion, disability and sexual orientation. $$ HR Team Spain $$ [email protected] $$ $$ $$ https://career5.successfactors.eu/career?company=gieseckede&career_job_req_id=27127&career_ns=job_application 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. We are looking forward to receiving your application! Giesecke + Devrient Mobile Security TCD Iberia S.L. Av. Baix Llobregat, 3, 5, 08970 Sant Joan Despí, B www.gi-de.com/careers IT_GROUP_MF_EUR_RUS_AUS_USA_CAN My team is shaping the future of IoT security. I’m proud of what we do: