Overview:You’ll collaborate with a cross-functional team to design and implement a highly secure mobile app SDK for enabling resilient payments along with a reference app using the SDK. You’ll work closely with product, architecture, and security specialists to deliver a robust, scalable, and secure solution.Key Responsibilities:• Develop native Android and iOS components (Kotlin/Swift) and backend integration points for proximity communication, payment flows, and secure transaction handling.• Implement secure, resilient payment capabilities and seamless integration with financial platforms.• Proactively participate in secure code review, remediation, threat modeling, and security testing across the development lifecycle.• Design and implement developer-friendly APIs and modular SDK components with strong error handling, observability, and comprehensive validation through unit tests and functional tests• Collaborate closely with team members, including architects, product owners, and security specialists; contribute to knowledge transfer and sustainable maintenance.• Ensure compliance with relevant standards and regulations (e.g., OWASP MASVS, PCI, PSD2, EMV, GDPR) and maintain secure coding practices.• Deliver in an agile environment with regular sprint demos and frequent progress updates.Required Competences:• Native mobile development for Android and iOS (Kotlin/Swift); experience with optional cross-platform options (React Native, Flutter) when appropriate.• Proficiency in proximity communication technologies (NFC, Bluetooth, QR code) and device-to-device secure protocols.• Hands-on experience with secure handling of sensitive data, and resilient transaction workflows.• Strong secure coding practices, encryption, secure storage, and familiarity with Secure Elements/TEE.• Ability to design and implement secure, modular SDK components and developer-friendly APIs.• Knowledge of and experience with regulatory/compliance domains relevant to financial services (PCI, PSD2, EMV, GDPR).• Experience with automated testing (unit, integration, security testing) and threat modeling.