Senior Software Engineer - Mobile Connectivity

DOOR is a technology company specializing in smart access solutions, and they are seeking a Senior Software Engineer focused on Mobile Connectivity. The role involves developing and optimizing Android applications for smart locks, ensuring robust communication protocols, and mentoring other engineers on best practices for wireless connectivity.

Responsibilities:

• Develop and optimize Android applications for smart locks
• Implement features for unlocking doors, data sync, and firmware upgrades over BLE and NFC to ensure fast, reliable over-the air operations
• Architect efficient communication protocols and data transfer mechanisms between smartphones and embedded lock hardware, optimizing for speed, security, and reliability in BLE/NFC connections
• Contribute to multiple products including the flagship Latch/Door Android app, companion iOS app, an Android-based intercom device app for building entry, and the OpenKit SDK that enables third-party apps to unlock doors without our native app
• Work closely with firmware engineers and backend developers to integrate mobile apps with IoT devices
• Define and refine APIs for mobile-to-cloud communication and ensure end-to-end functionality from the mobile app through the cloud to the device
• Analyze and resolve complex issues in the field, including reading hardware logs and debugging BLE GATT communications
• Work hands-on with firmware and hardware tools to diagnose communication problems and improve system stability
• Profile and enhance the performance of Bluetooth and NFC interactions (e.g. connection latency, data throughput) to provide a 'snappy' user experience for unlocking and updates
• Ensure the mobile connectivity stack is robust against interruptions and varying signal conditions
• Serve as the go-to expert on BLE and NFC within the organization
• Mentor and advise other engineers on best practices for wireless connectivity and asynchronous programming
• Stay up-to-date with the latest Android SDK features, Bluetooth updates, and IoT industry trends
• Prototype and incorporate new technologies to maintain our competitive edge in smart access solutions

Requirements:

• Master of Science Degree in Computer Science, Computer Engineering, or closely related field
• Two (2) years of professional experience in Software Engineering with a focus on mobile connectivity and Internet of Things (IoT) products
• Experience in Android SDK development using Kotlin and Java
• Experience in designing and implementing BLE GATT communications
• Experience in Near Field Communication (NFC) integration
• Experience in Android architecture patterns such as MVVM, MVI, and Clean Architecture
• Experience in asynchronous programming using Coroutines and RxJava
• Experience in collaborating with hardware/firmware teams
• Experience in troubleshooting device communication using BLE sniffers, logic analyzers, and firmware logs
• Experience in dependency injection (Hilt)
• Experience in unit testing, integration testing, CI/CD pipelines
• Proof of legal authority to work in the United States