Mobile Developer Engineer (España)

Mobile Developer Engineer - BarcelonaJoin our team as a Mobile Developer Engineer in Barcelona.Key ResponsibilitiesDesign, 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 end-to-end 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 stand-ups.Deliver features from ideation to deployment, maintaining security and compliance.Troubleshoot and optimize the CI/CD pipeline for quality and speed.Must-Have QualificationsProficient 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-HavesCross-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 CandidateSecure, test-driven code is your forte. You enjoy collaborating with teammates, mentoring others, and are comfortable exploring new tools and technologies in a fast-paced mobile environment.First 90 Days RoadmapDays 0-30: Orientation & FoundationsGet familiar with company culture and security basics.Attend intro sessions on 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 : Deepening Skills & First ContributionsParticipate 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 end-to-end 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 : Autonomous & Secure ContributionOwn delivery of a feature end-to-end (coding, TDD, peer review, E2E, 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.Benefits & CultureCulture 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: 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: Participate in and shape a global lighthouse project in digital currencies.Career development: Continuous training, coaching, and talent development programs.Social benefits: Flexible compensation (transport tickets, training, private insurance).Own canteen: Breakfast and lunch service with a variety of menus, salad desk, and sandwiches.Work-life balance: Versatile working hours with remote work options (Mon-Thu 8::30 and Fri 8::30; 3 days remote).Location: Sant Joan Despí, easily accessible by public transport.#J-*****-Ljbffr

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.

Secure, test-driven code is your forte. You enjoy collaborating with teammates, mentoring others, and are comfortable exploring new tools and technologies in a fast-paced mobile environment. First 90 Days Roadmap Days 0-30: Orientation & Foundations Get familiar with company culture and security basics. Attend intro sessions on 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 : 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 end-to-end 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 : Autonomous & Secure Contribution Own delivery of a feature end-to-end (coding, TDD, peer review, E2E, 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. Benefits & Culture 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: 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: Participate in and shape a global lighthouse project in digital currencies. Career development: Continuous training, coaching, and talent development programs. Social benefits: Flexible compensation (transport tickets, training, private insurance). Own canteen: Breakfast and lunch service with a variety of menus, salad desk, and sandwiches. Work-life balance: Versatile working hours with remote work options (Mon-Thu 8::30 and Fri 8::30; 3 days remote). Location: Sant Joan Despí, easily accessible by public transport. #J-*****-Ljbffr