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 application
• Implement Android Keystore keys, attestation, and device enrolment
• Develop deterministic byte-exact encoding against published test vectors
• Create signed statements protecting captured information integrity
• Implement encrypted offline queues and synchronized capture submissions

Requirements:

• At least five years of professional Android development experience
• Production experience primarily using Kotlin
• Practical understanding of signatures, hashing, DER, and serialization
• Experience with offline-first applications and encrypted local storage
• Clear written English for documentation and code reviews

Apply Android, Kotlin, cryptography, and offline-first expertise to Qaelum’s security-critical capture product.