Senior Android SDK Engineer — On‑Device ML & Privacy

Xident B.V.; Union, Northern (NJ, KY); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Xident B.V. is building a native Android SDK in Kotlin to enable its privacy-first verification on Android. You will implement CameraX-based liveness, on-device age classification, and robust document capture, keeping all biometric processing on-device.

This remote-first role welcomes contributors across multiple countries and requires strong Android SDK experience. The role focuses on SDK design, third-party integration, and secure on-device ML inference, with responsibilities spanning from

Qualifications

• 7+ years of professional Android development with Kotlin.
• Deep experience with CameraX/Camera2, real-time image processing, and GPU acceleration.
• Production experience building SDKs consumed by third-party developers.
• Understanding of on-device ML inference (TensorFlow Lite, ONNX Runtime, or ML Kit).
• Strong knowledge of Android security — Keystore, BiometricPrompt, encrypted storage.
• Experience publishing to Maven Central and managing SDK versioning and API stability.

Responsibilities

• Design and build our native Android SDK in Kotlin with Jetpack Compose and View-based integration
• Implement camera capture pipelines for liveness detection and face analysis using CameraX
• Integrate ONNX Runtime or TensorFlow Lite for on-device age classification models
• Build document capture with real-time edge detection, auto-crop, and quality checks
• Write comprehensive documentation, integration guides, and sample apps for developers
• Ensure compatibility across Android 8+ (API 26+) and optimize for device fragmentation

Skills

Android development

Kotlin

CameraX/Camera2

SDK development

On-device ML inference

Android security

Third-party SDK publishing

Tools

TensorFlow Lite

ONNX Runtime

ML Kit

Job description

Xident B.V. is building a native Android SDK in Kotlin to enable its privacy-first verification on Android. You will implement CameraX-based liveness, on-device age classification, and robust document capture, keeping all biometric processing on-device.

This remote-first role welcomes contributors across multiple countries and requires strong Android SDK experience. The role focuses on SDK design, third-party integration, and secure on-device ML inference, with responsibilities spanning from