About this role
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=27933&career_ns=job_application