Senior Kotlin Android Security Engineer

Build secure native Kotlin applications for Android 13 and later, using cryptographic signatures and offline-first design in a remote environment.As an experienced Android Engineer at Qaelum, you will turn detailed specifications into production-ready software for field agents. Your work will support trustworthy commodity records from Ghana, the Maldives, and planned Nigerian operations. The application must remain reliable on mid-range devices with limited connectivity. You will validate output through published test vectors and backend verification, collaborating directly with the CTO and founders asynchronously.Key Responsibilities:
Build and maintain the native Kotlin capture applicationImplement Android Keystore keys, attestation, and device enrolmentDevelop deterministic byte-exact encoding against published test vectorsCreate signed statements protecting captured information integrityImplement encrypted offline queues and synchronized capture submissionsRequirements:
At least five years of professional Android development experienceProduction experience primarily using KotlinPractical understanding of signatures, hashing, DER, and serializationExperience with offline-first applications and encrypted local storageClear written English for documentation and code reviewsApply Android, Kotlin, cryptography, and offline-first expertise to Qaelum’s security-critical capture product.
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