Senior Android Developer

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

We're building a native Android SDK to bring Xident's privacy-first verification to the Android ecosystem. You'll create a Kotlin SDK with CameraX-based liveness detection, on-device age classification, and document capture — keeping all biometric processing on the user's device.

Xident is building the future of digital identity verification. Our platform enables businesses to verify users' ages and identities in seconds, while respecting privacy through our unique "Verify Once, Access Everywhere" model.

Founded in 2023, we've already processed over 10M+ verifications processed and serve 500+ businesses. We're a remote-first company with team members across 12 countries.

Our mission is simple: To make identity verification seamless, private, and accessible for everyone. We believe privacy and convenience shouldn't be mutually exclusive, and we're proving it every day.

25+

Team members

500+ businesses

Customers

12

Countries

What You'll Do

• 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

What We're Looking For

• 7+ years of professional Android development with Kotlin
• Deep experience with CameraX/Camera2, real-time image processing, and GPU acceleration
• Production experience building SDKs or libraries 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

Nice to Have

• Experience with ML Kit or MediaPipe for face detection
• Background in identity verification or biometric applications
• Familiarity with FIDO2/WebAuthn credential management on Android

Our Hiring Process

We respect your time and aim to complete the entire process within 2-3 weeks. Here's what to expect:

1

Application Review

Application Review

3-5 days

Our team reviews your application within 5 business days. We look for relevant experience, passion for our mission, and alignment with our values.

2

Initial Call

Initial Call

30 minutes

A 30-minute video call with our recruiting team to learn about your background, discuss the role, and answer your questions about Xident.

3

Technical Assessment

Technical Assessment

1-2 hours

Role-specific evaluation—this might be a coding challenge, portfolio review, case study, or technical discussion depending on the position.

4

Team Interviews

Team Interviews

2-3 hours

Meet with 3-4 team members including your potential manager and cross-functional partners. We assess technical skills, collaboration, and culture fit.

5

Final Interview

Final Interview

45 minutes

A conversation with a company leader to discuss your career goals, our vision, and ensure mutual fit. This is also your chance to ask strategic questions.

6

Offer

Offer

24-48 hours

If it's a match, we move quickly. Expect a competitive offer within 48 hours of your final interview, with clear details on compensation and equity.

Our Values

Privacy by Design

We iterate quickly, gather feedback, and improve continuously.

Ownership Mentality

Everyone owns their domain end-to-end. No finger-pointing, just solutions.

Transparent by Default

We're happy to answer any questions before you apply. Reach out to our team anytime.