We are looking for an experienced Kotlin & Swift Developer with strong computer vision experience to design, build, and maintain a high-performance Software Development Kit (SDK) used in security-critical mobile applications.
This role sits at the intersection of mobile engineering, applied computer vision, and SDK architecture, and will play a key role in delivering reusable, secure, and developer-friendly components used by third-party teams and partners.
Key Responsibilities
SDK Design & Development
* Design and develop a cross-platform mobile SDK (iOS & Android) using Swift and Kotlin
* Create clean, modular, well-documented SDK APIs for external developers
* Ensure the SDK is easy to integrate, versioned correctly, and backward compatible
* Own the full SDK lifecycle: design, development, testing, packaging, and release
Computer Vision & Biometrics
* Implement and optimise computer vision pipelines on mobile devices
* Work with camera frameworks, image processing, and real-time analysis
* Integrate vision-based features such as:
* Face detection / liveness detection
* Image validation and anti-spoofing
* Multi-signal identity verification (where applicable)
* Optimise performance for low latency, low power usage, and on-device processing
Mobile Platform Engineering
* Develop native Android components in Kotlin
* Develop native iOS components in Swift
* Work closely with OS-level APIs (CameraX, AVFoundation, CoreML, Vision, etc.)
* Ensure high performance across a wide range of devices
Security, Quality & Performance
* Apply secure coding practices suitable for identity, authentication, or trust-based systems
* Write comprehensive unit, integration, and performance tests
* Profile and optimise memory usage, CPU/GPU usage, and battery impact
* Support internal and external developers during SDK integration
Collaboration & Documentation
* Collaborate with product, security, and backend teams
* Produce clear SDK documentation, sample apps, and integration guides
* Contribute to technical design discussions and architectural decisions
Required Skills & Experience
Core Technical Skills
* Strong commercial experience with Kotlin (Android) and Swift (iOS)
* Proven experience building and maintaining SDKs or developer platforms
* Hands-on experience with computer vision on mobile
* Deep understanding of mobile performance constraints
Computer Vision Experience
* Experience with mobile CV frameworks such as:
* Apple Vision / CoreML
* OpenCV (mobile)
* Custom ML or image processing pipelines
* Experience working with real-time camera input
* Understanding of lighting conditions, motion, spoofing, and edge cases
* Experience in using Tensaflow
Software Engineering
* Strong knowledge of software architecture and API design
* Experience with CI/CD for mobile libraries
* Versioning, semantic releases, and dependency management
* Comfortable working in high-assurance or security-focused environments
Nice to Have
* Experience with biometrics, identity verification, or liveness detection
* Experience writing SDKs consumed by external customers or partners
* Familiarity with cryptography, secure enclaves, or trusted execution
* Experience with cross-platform SDK strategies
* Background in regulated industries (finance, legal, insurance, defence, healthcare)
What Success Looks Like
* A robust, secure, and performant SDK that external developers enjoy using
* Vision features that work reliably across devices and environments
* Clear documentation that reduces integration friction
* SDK releases that are predictable, stable, and well-supported
Ideal Seniority
* Senior or Lead level
* Comfortable owning complex technical problems end-to-end
* Able to balance performance, usability, and security trade-offs