Senior Mobile App Development Engineer (iOS)

Job Title: Senior Mobile App Development Engineer (iOS)

Experience: 5+ Years

Location: Remote

Contract duration: 3-6 Months

Shift timings: Vietnam business hours (9:00 AM – 6:00 PM)

We are seeking an experienced Senior Mobile App Development Engineer (iOS) to join our team and lead the development of advanced smartphone-based digital biomarker capture solutions. This role focuses on owning and optimizing the low-level iPhone sensor capture stack to enable consistent, high-quality facial, ocular, and motion signal acquisition.

Role Summary

The engineer will work at the intersection of Apple frameworks, device-specific constraints, and real-time performance tuning. You will be responsible for building robust, privacy-forward, and high-performance capture workflows that support diagnostic-style smartphone measurements.

Key Responsibilities

• Implement and optimize sensor capture flows using TrueDepth, ARKit, AVFoundation, and CoreMotion.
• Translate algorithm and product requirements into reliable on-device data collection and frame synchronization.
• Design and build quality-control UX and capture-state instrumentation, including lighting checks, face alignment, motion thresholds, occlusion detection, and retake prompts.
• Optimize latency, thermal performance, and battery usage for short diagnostic capture sessions (approximately 10 seconds).
• Ensure privacy-first data handling with data minimization and compliant telemetry.
• Produce clear, Apple-facing technical documentation explaining API choices and data handling approaches.

Expected Deliverables

• A modular capture SDK layer with feature flags and comprehensive logging.
• Cross-device performance benchmarking matrix and tuning guidelines.
• Deterministic quality-control gates that reduce noise in biometric outputs.

Required Skills and Experience

• 5+ years of hands-on iOS engineering experience with deep expertise in sensor and camera frameworks.
• Strong experience with ARKit face tracking, blendshapes, eye metrics, and depth-enabled workflows.
• Advanced performance profiling skills using Instruments, including memory, thermal, and performance audits.
• Ability to write clear, well-reasoned technical justifications aligned with product and risk requirements.

Nice to Have

• Experience working on health or health-adjacent consumer applications using camera-based vital measurements.
• Familiarity with on-device machine learning (Core ML) and mobile privacy architectures.