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Position Overview We are seeking a motivated Mobile App & IoT Software Developer to help build and maintain the Android and iOS mobile applications for our comprehensive IoT platform. The platform centres on E-paper display devices, sensors, beacons and related products used across retail, healthcare, logistics and other sectors. This is a hands-on part-time role focused on developing clean, reliable and user-friendly mobile apps that connect to our existing cloud backend and real-time IoT data streams. Candidates must be eligible to work in Hong Kong and have strong bilingual skills in English and Traditional Chinese. Flexible hours and remote working will be considered. Key Responsibilities The successful candidate will primarily work on the mobile application layer of our end-to-end IoT ecosystem: Mobile App Development (Core): Design, develop and maintain native or cross-platform Android and iOS applications that interface with our IoT platform. Feature Implementation: Build intuitive screens for device monitoring, real-time sensor data visualisation, alerts, configuration and user management. Backend Integration: Connect the mobile apps securely to our existing cloud APIs, MQTT message streams and authentication services. Quality & Maintenance: Write clean, well-documented code; perform testing, debugging and iterative improvements based on feedback. Collaboration: Work closely with the existing full-stack team on requirements, UI/UX consistency and platform road Technical Skills Mobile App Development (Core) Solid experience building mobile applications for Android (Kotlin / Java) and/or iOS (Swift / SwiftUI). Practical experience with at least one cross-platform framework is highly valued: React Native and Capacitor JS. Ability to implement clean, responsive UI and good mobile UX practices. Experience integrating GraphQL APIs and handling authentication (JWT / OAuth). Familiarity with state management, local storage and offline-first patterns. IoT & Backend Integration (Important) Understanding of how mobile apps consume real-time IoT data (MQTT, WebSocket or similar). Basic familiarity with cloud backends and RESTful services. Willingness to learn our existing platform architecture (device data pipelines, alerts, multi-tenant structure). Network Protocols & Cybersecurity (Strong Bonus) Solid understanding of common network protocols relevant to IoT and mobile (TCP/IP, HTTP/HTTPS, MQTT, WebSocket). Awareness of mobile and IoT security best practices: secure API communication, certificate pinning, secure storage of credentials, input validation and common vulnerabilities. Interest in applying security-minded development practices when handling device data and user accounts. DevOps & Collaboration (Nice-to-Have) Comfortable with Git for version control and collaborative development. Basic familiarity with CI/CD concepts or app store submission processes (Google Play / Apple App Store) is a plus. Ability to write clear technical documentation and communicate progress Other Skills Preferred Proficiency in Cantonese and English, Mandarin (bonus) Experience in development using Agentic AI tools Experience in developing documentation related to software development, instructional manuals Project management skills and progress reporting Experience in database management, systems integration and website building Good communication skills Education and Experience Minimum: Currently in the final year (Year 4) of a Bachelor’s degree or university graduate in Computer Science, Information Systems, Information Technology Management, Artificial Intelligence, or Business Computing and Analytics. Or: Prior software development-related work experience. Working Hours and Arrangement 16-32 hours / week, or equivalent of 2-4 working days per week Flexible arrangements: Alternative hours or work schedules can be negotiated during the application or interview process. Office hours: 9:00am to 6:00pm, or pre-arranged working hours. Our company is committed to fostering innovation and personal growth. If you have strong full-stack IoT experience (especially with ESP32, MQTT, cloud IoT platforms, and real-time dashboards) and are interested in a part-time role, we'd love to hear from you! Interested candidates should submit their full resume with your relevant experience, particularly any past work involving embedded + cloud + frontend in IoT projects, availability, present and expected salary, to angel@e-labelsolutions.com and CC: xavier@e-labelsolutions.com.hk
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