Senior Software Engineer - Mobile Connectivity

Senior Software Engineer – Mobile Connectivity– Olivette, MO. Telecommuting is permitted: 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. Defi ne and refi ne 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. Telecommuting is permitted.

Requirements & Qualifications:

• Applicant must have 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.
• Applicants must have experience in: Android SDK development using Kotlin and Java; designing and implementing BLE GATT communications; Near Field Communication (NFC) integration; Android architecture patterns such as MVVM, MVI, and Clean Architecture; asynchronous programming using Coroutines and RxJava; collaborating with hardware/firmware teams; and troubleshooting device communication using BLE sniffers, logic analyzers, and firmware logs.
• Applicants are also required to have experience in dependency injection (Hilt) and unit testing, integration testing, CI/CD pipelines.

Must have proof of legal authority to work in the United States. 40 hours per week. M-F: 9:00 a.m. to 5:00 p.m. Telecommuting is permitted. Salary $97,386 – $99,386.00 per year. To be considered, please visit DOOR Systems, Inc. career site website at https://door.com/careers to create a profile and submit a resume.