Wireless Software Engineer

• Wireless software and protocol development around IEEE 802.15.4 and Thread Mesh technology for Apple products.

Senior Software Engineer

• Zigbee Direct: Zigbee Direct is a new feature of Zigbee that allows BLE devices to connect a Zigbee network via a Zigbee Direct Device (ZDD). My responsibility includes the commissioning, security and tunneling implementation for ZDD.

Software Engineer II

• Concurrent Multi-Protocol (CMP): CMP empowers a Host-RCP device running Zigbee, Thread, and BLE wireless connectivity concurrently. My responsibility includes the pro-compliance-posix implementation for IEEE 802.15.4 MAC certification, host app optimization (stability and CPU consumption), Silicon Labs' multiprotocol docker container integration, supporting customers with NCP-to-RCP migration.
• Zigbee & Multiprotocol Hardware Continuous Integration (HW CI): HW CI runs Zigbee and Multiprotocol tests automatically with new commits, serving as a guard for development and a checkpoint for release.
• Zig-Dock: Mentored a summer intern to implement Zig-Dock, an architecture and OS independent docker container solution for multiprotocol development. It allows developers to develop, build and run multiprotocol apps on their laptops for different architectures (x84_64, i386, arm32v7 and arm64v8).

Software Engineer

• Multi PAN: a Silicon Labs proprietary Zigbee feature that allows a device to operate on multiple Zigbee networks. These Zigbee networks are able to have different PAN IDs, security levels, and topologies. A multi-PAN device is able to serve different roles (coordinator/end device) in different networks.
• EmberZNet Serial Protocol (EZSP) v8.0: EZSP is used by a host application processor to interact with the Zigbee stack running on a Network Co-Processor (NCP). A new frame format has been introduced to reorganize frame segments so as to increase EZSP frame ID from 1 byte to 2 bytes but with the same total frame length.

• Used Bootstrap and D3.js to implement the GUI design and the graph operation visualization (i.e. graph construction, ranking, clustering, and path-finding) for Rogas.
• Used Tornado web framework to constructing a web server for Rogas by integrating its query engine.

• Designed the system framework and the SQL-extended query language (RG-SQL).
• Implemented the relation-graph hybrid data model and the query processing engine by integrating PostgreSQL with Graph-tool, SNAP, and NetworkX.
• Wrote the user manual for Rogas.
• Co-authored and published "Rogas: a declarative framework for network analytics - Liu, M. and Wang, Q., 2016. Proceedings of the VLDB Endowment, 9(13), pp.1561-1564."
• Co-authored and published "Data Analytics: From Conceptual Modeling to Logical Representation - Wang, Q. and Liu, M., 2016. In Conceptual Modeling: 35th International Conference, ER 2016, Proceedings (pp. 415-429). Springer International Publishing.