Eagle Brothers Information Technology's products are flight controllers for agricultural plant protection and special purpose drones, including helicopters and multi-rotor drones. Based on the open source ArduPolit project.The main work includes: Original open source project control adaptation problem in large drones, flight attitude control optimization, implement semi-automatic flight mode, automatic sprinkling control, motor, ESC adaptation, implement plant protection function for ground station software, integration high performance RTK solution, new device import evaluation, find and solve high-current interference problems, helicopter parameters debugging.Based on the Baidu cloud IoT platform, the IoT function of the UAV is realized, and the line breaking cache, online detection, device management, data security transmission, OTA upgrade, etc. are realized.Architecture design and core code writing of software functions, schedule management, etc.Based on STM32F429 and STM32F103, Linux and Nuttx operating systems. Use C++, C#, Python and other languages.

Sierra Wireless Communications is the world's largest manufacturer of IoT communication equipment based in Canada. The main products are 2G/3G/4G wireless communication modules, network cards, etc.· Development and maintenance of HiLo and HiAll series 2G communication modules, including TCP/IP, SSL protocol stack porting, private AT command development and maintenance, FOTA function, user manual maintenance, etc. Use STE's 4852 and 4901 chips, ARM9 architecture, RL-Arm operating system.· Development eCall function, solves the problem of low success rate of eCall calls that have been plagued for several years.· Maintenance of AirVantage series 3G/4G modules, integration and testing of Qualcomm upgrade patches, and solving problems encountered during user use. Based on Qualcomm MSM9x15 chip, ARM11 mcu, private operating system.· New product introduction, 4G wireless module based on MTK solution, including program evaluation, definition of product functions, and user interface (AT command) compatibility evaluation with existing products

Highvision Technology is a company engaged in the development of GPS baseband, RF chip and GPS navigator. Design the GPS baseband solution and integrates in other company's chipset (Junzheng, Quansheng, etc.) to form a win-win cooperation model. .Responsible for the development of high-performance GPS receiver modules, GPS system applications and application products in special fields, leading the software team to:· Multiple navigator software architecture design.· Software development for Andriod and uCos platform navigator solutions.· The transplantation of a variety of map software, such as KaiLiDe, DaoDaotong, and Informatics.· Assist the chip department in functional testing of GPS baseband chips.· Creation and management of a version management system (SVN).

TeleEpoch is a mobile phone design company with approximately 50 employees.· Create test team, management and bug management platform (BugZilla), software version management system creation and maintenance (using CVS), daily test task management, management software version and release to customers.· Develop CDMA mobile phones and be responsible for the research and development of multiple products of the company. Using Qualcomm's MSM60xx, MSM70xx chips, BREW platform. Assign and direct junior engineers to collaborate on tasks.

AZTech is Singapore company, main product is cordless phone, VOIP, PMR and network card. Since year 2001, I worked as project manager. There are 8 engineers and 4 tester lead by me.Digital Enhanced Cordless Phone (DECT) phone use Philips Vega chipset, DECT is a ISO standard for cordless phone, mainly used in Europe, Philips DECT solution based on a ARM7 chipset with DSP to run DECT protocol. Software based on a real time operation core and state machine.The main task is:* Module and task divide, software version control.* Coding, include:* State machine and MMI, include character LCD, BW/color dot matrix LCD, use ucGUI as GUI engine.* SMS, fixed line SMS (ETSI standard), work include protocol stack, storing on base and read/edit on handset.* Driver, such as IIC, EEPROM, LCD, Flash and Keypad's driver.* Contacts, call history, setting, etc.* Base part software, such as emergency call, PABX, LCR, V.32 Modem, DTAM, call restrict, etc.* Test software for mass produce in factory.Main production include:1. Low end: use character LCD, minimal RAM and Flash.2. Middle end: use B/W or 1.4 inch color LCD.3. High end: use 1.8 inch color LCD, can support DTAM(Digital Telephone Answer Machine).4. DECT phone with additional functions, such as VOIP.5. Wireless Skype phone, connect the DECT phone to PC via USB, main job is USB driver and communication protocol.6. PMR with GPSA PMR with GPS navigation functions, it can records user’s coordinate when moving, and lead user to his start point. Send coordinate to other PMR to make communication.This project use Philips LPC2210 (ARM7) chipset, Operation System is uCOS, use ucGUI for graphics interface. I take charge of chip select, software select and porting, module design and assign task to engineer. Module test and system integration.

PDA, coding for some applications, such as schedule, contacts, sync, etc.