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- I am a highly skilled professional with a strong background in manual testing, data entry, and virtual assistance. My expertise lies in ensuring the quality and functionality of software through meticulous manual testing processes. I bring a keen eye for detail and a systematic approach to identifying and resolving issues, ensuring that projects meet the highest standards. - I hold a degree in Software Engineering from Ton Duc Thang University, where I gained comprehensive knowledge in software development, system architecture, and programming languages. My academic training has equipped me with a solid foundation in the principles of software engineering, ensuring a deep understanding of the technical aspects crucial for effective manual testing and quality assurance. - Fluent in both English and Vietnamese, I offer bilingual capabilities that broaden my communication skills and enable effective collaboration with clients globally.

I am a professional embedded software engineer with more than 12 years of experience. My current areas of expertise are IoT Applications & Embedded Systems Design, including embedded hardware/software. 𝐌𝐘 𝐒𝐊𝐈𝐋𝐋𝐒: - Know about MCU: Nordic, Silicon Labs, AVR, PIC, ESP, TI CC32xx, ESP32, Qualcomm QCC51xx, etc. - Have experience in programming languages such as C/C++, C#, Java - Solid knowledge of standard interfaces such as I2C, SPI, UART, and CAN. - Have experience using debugging tools such as Segger Jlink, CAN bus analyzer, and Logic analyzer. - IoT devices with wireless connectivity such as LTE, CAT-M1, NB-IoT, LoRa/LoRaWAN, BLE, WIFI, NFC - Good experience in AWS Service, AWS IoT, AWS Shadow, and AWS Jobs. - Good experience in Battery Management Systems based on BQ products from TI. - Good experience with Audio Codec chips. - Experience with AI/ML on Edge Impulse with nRF Connect - True wireless earbuds, headsets and speakers, Bluetooth ® LE Audio standard from Qualcomm: QCC5141, QCC5171, QCC5181,... We have worked with wearable devices and medical devices: - ECG 1, 3, 12 leads with ADS1292, ADS1293, ADS1298 - EEG with ADS1299 - Body temperature with MAX302025, MAX30208 - PPG with MAX86178, MAX86178 - SPO2 with OB1203, MAX32664 sensor hub - Vital signal with AFE4950 - OTA firmware update via Bluetooth/WIFI End-to-End Embedded & Hardware Solutions I provide complete product development services — from concept and design through prototyping, firmware, and production — for IoT, wearables, medical, and consumer electronics. Hardware & PCB Design - Multi-layer PCB design for high-reliability, high-performance systems - High-speed design: USB 2.0, HDMI 2.0, DDR3/DDR4/LPDDR4, PCIe, NAND Flash, Ethernet (up to 10GBase-T1), PoE++ - Microcontrollers & SoMs: ARM Cortex-M3/M4 (STM32, ESP32, Nordic nRF52/53/91); custom boards for Raspberry Pi CM4, iMX8, Jetson Nano/Xavier/Orin, RK3588/3568, TI AM6254 - Power & analog: DC-DC (Flyback, Boost, Buck, LDO), BLDC/servo motor control, high-resolution ADC/DAC, audio circuits, and battery management (BMS) - DFM/DFA and EMC/EMI compliance, with certification support (CE, FCC, FDA-ready) - Tools: Altium Designer, KiCAD, Eagle, EasyEDA, OrCAD; SolidWorks and Inventor for 3D/enclosure design Firmware & Connectivity - Embedded software in C, C++, Python, and Qt, with RTOS integration and low-power optimization - Custom driver development and communication protocols: QSPI, I2C, SPI, RS485/RS232, CAN, Modbus (TCP/IP/RTU) - Connectivity stacks: BLE, Wi-Fi, NFC, LoRa/LoRaWAN, LTE, CAT-M1, NB-IoT, GSM (3G/4G) IoT platforms: MQTT, ThingsBoard, AWS IoT, Blynk; secure OTA updates, device provisioning, and cloud integration - Robotics: ROS/ROS2 for AGV, AMR, and 6-axis robot applications - Embedded UI/UX: Figma, TouchGFX, LVGL AI & Cloud Integration - Edge AI/ML deployment (Edge Impulse, TensorFlow Lite) - Predictive maintenance and anomaly detection for IoT/IIoT - Cloud integration with AWS, Azure, and Google Cloud - Cross-platform mobile apps (Android/iOS) and web dashboards for monitoring and analytics Product Leadership - Proven experience leading cross-functional teams in startup environments - End-to-end project management across design, fabrication, and procurement for cost-efficient, on-time delivery - Strong troubleshooting and research skills for electrical evaluation, testing, and design optimization 🔑𝐊𝐄𝐘𝐖𝐎𝐑𝐃𝐒: Embedded Design, Hardware Design, Firmware Development, Mobile App Integration, IoT Device, Medical Device Design, Embedded Systems, Real-time Operating Systems (RTOS), Microcontroller Programming, Sensor Integration, Wireless Communication (Bluetooth, Wi-Fi), Low Power Design, Wearable Devices, Firmware Architecture, Embedded Software, Device Drivers, System-on-Chip (SoC), PCB Design, Signal Processing, IoT Platforms, Cloud Integration, Mobile App Development, Web Portal Design, Healthcare Technology, Remote Monitoring, Data Security, Telemetry, ARM Cortex, ESP32, Device Connectivity, Embedded Prototyping, Human-Machine Interface (HMI), Medical Device Compliance, Mobile-Connected Devices, IoT Security, BLE, Firmware Debugging, Connectivity Solutions, Edge Computing, Smart Devices, Industrial IoT.

✅ Upwork Certified All-Star Freelancer Gold Club Member with "TOP RATED PLUS" Badge who has successfully helped many Fortune 500 companies (Ford & Lincoln Motor Companies, DELL Inc, Citibank, SolarWinds etc) with their product delivery. ✅ Listed among TOP 1% of Successful Upwork Freelancers with an over "9x% Job Success" Badge. Expert in QA, Manual Testing, Automation Testing (using different kind of programming languages and frameworks), QA and Project Management, Product development. ✅ 20,000+ hours of exclusive Software Quality Assurance, Software, App Development and Testing experience on Upwork (5 STAR rating) and 7+ years of corporate experience in the field of Product development, QA and testing software ✅ A Full time Freelancer & Certified Advanced SQA Manager ✅ Completed 10+ Projects with 5 STAR Rating ✅ Logged 20,000+ valid defects in these projects ✅ 100% client satisfaction record ✅ 93% are repeated clients ✅ 7+ Years of extensive experience in Manual, Automated testing and Product development. ✅ Extensive experience in Agile/Scrum/Kanban/Lean methodologies ✅ 100% flexible, can work in any time zone ✅ Extensive experience in working as a skillful offshore service provider and have successfully delivered testing projects to client all over the world [USA, Australia, Netherlands, Switzerland, Canada, Russia, India etc]. ✅ Cross browser testing in most platforms, OS (Win 7, Win 8, Win 8.1, Win 10, Mac OS X) and web browser versions (IE, Chrome, Firefox, Safari, Opera). ✅ Mobile testing on latest versions of Android and iOS 8.1.1, iOS 9, iOS 10, iOS 11 (iPhone 7 Plus, iPad and iPad Mini with retina display) tablets, phablets (Samsung Galaxy Note, Galaxy S8, LG G Pro, Motorola G2, G3, Moto X Play) and other smartphones. ✅ IE Edge, IE11 down to IE7, Chrome, Opera, Firefox and Safari on desktop, Mac, tablet (Android browser, Safari and Chrome) and mobile phone (Android browser, Safari and Chrome). ✅ Vast experience in Test management tools like TestRail, ApTest Manager, BaseCamp, Rally, Asana, Assembla, Trello, XRay, Microsoft Test Manager and knowledge in automated testing tools (QTP, Selenium, Protractor, Cypress and in-house tools). ✅ Expertise in Administering and using Defect Management and Tracking tools, like JIRA, Github, Gitlab, Pivotal Tracker, Bugzilla, Mantis, Rally, BugHost, Asana, Assembla, Trello , BugTracker, uBugTrack etc. ✅ Very good at providing testing documentation in form of release docs, test matrices and Powerpoint presentations. ✅ Ability to attain a quick understanding of the FRS / SRS and generate adequate test cases to ensure *near* 100% coverage of requirements. ✅ In case, no concrete requirement document is available, can make use of Exploratory Testing skills to perform testing with excellent results. ✅ Good understanding of Software Development Life Cycle (SDLC) and Software Testing Methodologies. Possesses good Communication, Analytical, Problem solving and Documentation skills. ✅ Expertise in System testing, Functional testing, Acceptance testing, Database testing and Regression testing. More than 6 years of experience in Product Testing while working in Agile Environments (TDD, Scrum). ✅ Extensive experience in both web (with specialization in cross browser compatibility, Usability and UI testing, functionality testing, cookie testing, security testing, session testing, user authentication testing etc) and product-based applications. ✅ Designing and executing System, Functional, Acceptance, Smoke and Regression Test cases.

Are you looking for a seasoned expert in cross-platform mobile app development using Flutter? Look no further! 🔧 My Expertise: I excel in crafting high-quality cross-platform mobile apps using Flutter. I am well-versed in various design patterns, including BLoC, Provider, and GetX, and I'm fluent in programming languages such as Dart, Swift, Java, Objective-C, and JavaScript. Additionally, I have extensive experience with essential mobile frameworks like In-App Purchases, Maps, Camera, and Push Notifications. 📦 Third-Party Integration: I bring a wealth of experience in integrating third-party SDKs, making your app feature-rich and interactive. Some of the SDKs I've successfully integrated include Facebook, Stripe, Google Maps, AdMob, and more. 📊 Quality and Scalability: My commitment to quality is unwavering. I create apps that are not only responsive but also rigorously tested across a wide range of devices. I pride myself on delivering well-architected, well-documented, and easily maintainable projects, ensuring that your app can grow and adapt as your company does. ✅ My Skill Set: Languages: JavaScript, Dart, Java, Swift, Objective-C Platforms: Flutter, Android, iOS Familiar with SDKs & Tools: Firebase, Stripe, Mapbox, Google Maps, Facebook, Twitter, LinkedIn, and more Environments: Proficient in Windows and MacOS Version Control and Project Management: Bitbucket, Github, Jira, Trello, and others 💼 Let's Collaborate: If you're looking for a Flutter developer who can turn your app ideas into reality, I'm ready to discuss your project and bring it to life. My commitment to excellence and a track record of successful projects make me the ideal choice for your mobile app development needs. Let's build something great together!

So, you’re looking for a developer to help you develop or fix problems on your website? Have 4 years of professional experience on various multi-tiered applications with expertise in front-end development using Angular 2+, HTML5, SCSS, CSS3, and Bootstrap. I’m not saying I’m the best in this industry, but I’m probably the only person who is willing to do these 5 things for you: ◾ Go the extra mile. I’m willing to spend 80% of my time researching so I can understand your problem and help you solve your problem (Unless I’m willing to modify my product again and again). ◾ I’m not the kind of 9-to-5 person who just waits until 5 pm to shut down the laptop. Working extra hours to help you achieve what you’re looking for is my biggest hobby. ◾ I'm always listening to you and always ready to modify/fix all issues you want to finish the product (Until the client satisfies that all I want) ◾A highly motivated software engineer seeking to get a job in the freelancer sector, where I can use my skills and knowledge to learn new things and grow as a software developer. ◾I'm still passionate about grasping any other programming languages, or frameworks that I can integrate into web coding in my head. Features:- ✅ Full Stack Development, Web Design ✅ Fully Responsive (Cross-browser/platform) and Mobile-Friendly ✅ C#, Angular, .NET MVC, HTML5, CSS3, SCSS, Bootstrap, TypeScript, JavaScript, jQuery ✅ Troubleshooting and Bug Fixing ✅ API Integration ✅ Design API document ✅ Custom Back-End Development (ASP.NET, JAVA) Best regards, Hoang Tho

Dear Sir/Mdam, My name is Nathan Huynh, a Vietnamese, located in Ho Chi Minh City, Vietnam (time zone GTM+7). I'm a Senior Software Engineer at NashTech Global at the present and I have: • More than 5 years using Microsoft Technologies stack for developments with solid background knowledge. • Experience in projects using Agile (Scrum) and tracking tools such as Redmine, Jira, Target Process, Svn, Git • Good knowledge of Object Oriented Programming, MVC, SOLID, TDD.. I have worked as a part-time freelancer ever-since completing a master degree from Vietnam National University HoChiMinh City, Vietnam. My field of Software Development and Database Administrator. For valuable clients I provide the following freelance services: ➡️ Provide data scraping, web scraping service. I'm familiar with C# .NET, Python, PHP and Javascript languages, and some software like Selenium, Google Chrome's extension, Data Scrapping Studio, WebHarvy, ect... for such web-scraping jobs. For most of my projects, I build my own scraping script. Using C# with some additional programming libraries like Selenium, RestSharp, HtmlAgilitiPack. I have 1 data scraper server and 1 database server. Data scraped will be stored to the database server and will be exported to the format my client want (XLSX, CSV, JSON,...). I can show you how the system looks like if you requested. ➡️ Provide analysis, insights, fuzzy matching, predictive analytics, alerts from the data - any custom solution ➡️ Provide regular (manual) services for data management tasks. (Data Entry, Typing, Internet research etc.) ➡️ WebApp development & Bugs fixing (any programming language) I am very flexible in working time and communications, especially looking for a long-term business relationship. I can follow all your requirements and can advice good solutions to accomplish this job effectively and with the minimum budget. I only apply to the project that I can do. If you have any doubts regarding my skills please take a look at my work history to get an idea of my experience, feedback & the working relationship with other clients. So let’s get started with messaging on Upwork! Best Regards, Nathan Huynh.