What we offer

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Requirements

- Strong experience in mobile development and architecture, with a focus on financial and payment applications.

- Lead SDK development for Tier 1 banks and fintechs, supporting millions of users globally.

- Delivered white-box cryptographic solutions using tools like Arxan or WhiteBox Encryption.

- Worked on mobile wallet integrations, card tokenization, and secure provisioning flows.

- Collaborated with cross-functional teams across product, security, and compliance domains.

- Experience with secure backend communication and mobile app hardening.

- Conducted performance analysis of mobile ap with the focus on identifying and resolving bottlenecks

Key competencies:

- Mobile SDK architecture and lifecycle management
- White-box cryptography and secure key management
- Payment standards and protocols (EMV, PSD2)
- Secure coding practices and mobile threat mitigation
- Cross-platform development strategies Kotlin Multiplatform
- Regulatory compliance and audit readiness Security and Functional

Key skills:

Languages: Kotlin, Java , Swift, Nice to have: C/C++
Architecture: Clean Architecture, MVVM, Modularization
Security Tools: DexGuard, Other 3rd party, OWASP MASVS
Cryptography: AES, RSA, ECC, HMAC, Secure Enclaves, White-box AES, JWT
CI/CD: Jenkins, Gradle
Technologies: Android SDK, Android Jetpack, Retrofit, Coroutines, Firebase
Polish and English – fluent as a must have

Responsibilities

Architect and lead development of secure and scalable mobile SDKs for payment solutions across iOS and Android platforms.

Collaborate with product, compliance, and engineering teams to align SDK capabilities with business and regulatory requirements.

Ensure SDKs meet global standards for security, performance, and interoperability (e.g., PCI-DSS, EMV, 3DS).

Conduct threat modeling and security reviews for mobile SDK components.

Guide integration strategies for partner apps and third-party developers using the SDK.

Design evolution of documentation, developer guides, and sample apps to support SDK integration.