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Dat H.

Ho Chi Minh City, Vietnam

$25/hr
5.0
22 jobs

With 3+ years of hands-on experience, I specialize in taking embedded products from prototype to mass production. I've completed 10+ real-world projects and successfully shipped consumer products that are now in end-users' hands. What I Do Best I build production-grade firmware — not hobby projects. My work spans the full embedded stack: hardware bring-up, device drivers, firmware, bootloaders, OTA systems, and companion mobile/PC apps. Core Expertise - MCU Platforms: STM32 (F0/F1/F4/L0/L4), ESP32/ESP32-S3/ESP32-P4/ESP32-C3, nRF52480/NRF52832, ARM Cortex-M & RISC-V, ... - RTOS & Bare-Metal: FreeRTOS (advanced task sync — queues, semaphores, event groups, task notifications), bare-metal programming, custom bootloader development, ... - Peripherals: I2C, SPI, I2S, UART, PWM, ADC/DAC, RMT, Modbus RTU, USB HID, ... - Connectivity: Wi-Fi, BLE, LoRa, NFC, GSM/GPRS, NB-IoT, 4G, ... - IoT & Cloud: MQTT, HTTP/HTTPS, WebSocket, TCP/UDP | Azure IoT, AWS, Firebase, ... - Security: Secure Boot, encrypted NVS storage, FIDO2 passwordless authentication - Languages: C/C++ (primary), Python, Dart/Flutter (mobile & desktop apps), Java - Sensors: Accelerometer, IMU, Gyroscope, Time-of-Flight (ToF), Fingerprint, Ambient Light, Temperature, Humidity, Water Quality, Gas, Heart Rate & SpO₂, ... - Peripherals: Camera, Microphone, Speaker, Buzzer, ... - Displays: TFT, OLED, LCD, HMI, ,.. - Build & Debug: ESP-IDF, Makefiles, CMake, linker scripts, GCC toolchain, GDB/JTAG — fully IDE-independent - Other: Embedded Linux (Raspberry Pi, Orange Pi), Edge AI on MCUs, VoIP, WireGuard VPN, OTA update systems, PCB design (EasyEDA) What Sets Me Apart I deliver production-ready firmware, not proof-of-concepts. Clean architecture, proper error handling, memory optimization, and power management. I work at the toolchain level — Makefiles, linker scripts, GCC, GDB — not dependent on any IDE. I collaborate effectively with backend teams, including building systems using MCP (Model Context Protocol). I've shipped real consumer electronics — I understand what it takes to go from "it works on my bench" to "it works in 10,000 units." If you're a startup building a hardware product and need someone who can take it from prototype to production, let's talk.

  • Research & Development
  • Embedded C
  • C
  • C++
  • Flutter
  • Android
  • Python
  • AWS IoT Core
  • ARM Microcontroller
  • ESP32
  • nRF52
  • MQTT
  • HTTPS
  • WiFi
  • STM32
TEMUR E.

Navoiy, Uzbekistan

$25/hr
5.0
28 jobs

I'm an IoT & embedded systems engineer focused on production-ready solutions. From custom PCB design in EasyEDA to ESP32 firmware, cloud services, and dashboards — I deliver complete hardware-to-cloud systems. Hardware: schematic design, PCB layout, Gerber/BOM/Pick&Place files, JLCPCB production, AC/DC power circuits, sensor integration, engineering review process. Firmware: ESP32 (ESP-IDF/Arduino), LVGL touchscreen UI, MQTT, BLE, OTA updates, payment integration. Built and delivered: IoT smart relays (220V AC), environmental monitoring boards, sonar driver modules, vending machines, hydroponic controllers, payment terminals.

  • Arduino
  • ESP8266
  • ESP32
  • Internet of Things
  • MQTT
  • Websockets
  • Embedded C
  • JavaScript
  • PHP
  • REST API
  • React
  • Embedded System
  • PCB Design
  • EasyEDA
  • Firmware
  • Circuit Design
  • Electronics
  • Electronic Design
Sabri R.

Colombo, Sri Lanka

$5/hr
5.0
1 jobs

I’m a junior engineer experienced in designing and building Arduino and ESP-32/8266 automation systems, from PCB designing to programming and full hardware development. - Knows Python, C/C++ - Proficient in SPI and I2C communication protocols. - Experienced in Home Assistant, MQTT.

  • PCB Design
  • ESP32
  • ESP8266
  • Arduino
  • Home Automation
  • Internet of Things
  • Biotechnology
  • Python
  • C
  • C++
  • Embedded System
  • Embedded C
  • Raspberry Pi
  • Embedded Linux
  • LoRa
Vishnu C.

Belgaum, India

$5/hr
4.7
41 jobs

I am an electronics and firmware developer with experience in PCB design, firmware development, prototyping and SMD assembly. My journey started with hand crafting single sided PCBs — giving me a strong practical foundation from the ground up. PCB Design: 2 and 4 layer PCB design in KiCad 8,Kicad 9(Soon migrating to Kicad 10) & EasyEDA(Standard & Pro version) . Former EagleCAD user Schematic to manufacturing ready layout Custom footprint creation Gerber, drill, pick and place and BOM files Full submission support for JLCPCB(PCB & PCBA) and similar manufacturers Assembly & Prototyping: SMD soldering — 1206-0402 passives, QFN, TSSOP (except BGA) Through hole soldering Small batch prototype assembly Component procurement support Firmware & Connectivity: Microcontrollers — ESP32, ESP8266, Arduino, AVR, 8051 Cellular — Quectel EC25 & SIMCom SIM7672 with MQTT SSL/TLS Wireless — LoRa, WiFi, Bluetooth, GSM GPS — Ublox & Quectel module integration Displays — OLED, TFT, capacitive touch Protocols — I2C, SPI, UART, MQTT SSL/TLS, HTTP REST Motor drivers, WS2812 LED arrays, power circuits GPS- Quectel L89, Ublox M10S Special - WS2812 Led Projects include: GPS trackers, GSM security systems, water level controllers, , line followers, obstacle detection robots, WS2812 LED arrays and various ESP32 and Arduino IoT devices. I am a full time freelancer committed to clear communication and timely delivery — working with hobbyists, startups and commercial clients alike. Feel free to reach out!

  • AVR Microcontroller
  • ESP32
  • Raspberry Pi
  • Microcontroller Programming
  • Arduino
  • Firmware
  • ESP8266
  • Eagle
  • PCB Design
  • Electronics
  • KiCad
  • Electronic Design
  • MQTT
  • Digital Electronics
  • Circuit Design
  • Hardware Troubleshooting
  • Embedded C
  • EasyEDA
Oltion N.

Tirana, Albania

$40/hr
5.0
51 jobs

Expert Network Engineer & System Administrator | MikroTik Certified Summary: With a proven track record in network engineering and system administration, I offer a comprehensive skill set and a commitment to delivering excellence. As a certified MikroTik Network Associate, I specialize in designing, implementing, and optimizing networks for optimal performance and security. My expertise spans dynamic routing, network security, VPN setup, load balancing, and more, making me a reliable partner for your infrastructure needs. Key Skills: - Dynamic Routing & Optimization: Proficient in OSPF and BGP protocols, ensuring efficient traffic management and network scalability. - Robust Network Security: Implementing robust firewalls, intrusion detection systems, and encryption protocols to safeguard against cyber threats. - Advanced VPN Solutions: Configuring secure VPN tunnels for remote access and interconnecting geographically dispersed networks. - Load Balancing & Failover: Designing resilient architectures with load balancing and failover mechanisms to ensure high availability. - Quality of Service (QoS): Prioritizing network traffic for critical applications and services to maintain optimal performance. - Captive Portal Setup: Deploying captive portals for seamless guest authentication and access control in wireless networks. - DNS & Email Server Setup: Setting up and managing DNS servers and email servers for reliable communication infrastructure. - RADIUS Authentication: Configuring RADIUS servers for centralized authentication, authorization, and accounting. - Wireless Network Expertise: Designing and optimizing wireless networks, including long-range point-to-point links for seamless connectivity. - Monitoring & Management Tools: Proficient in utilizing Zabbix and other monitoring tools for proactive network management and troubleshooting. - VoIP Technologies: Experience with Asterisk and Vicidial for deploying VoIP solutions tailored to business needs. Additional Skills: - Programming Proficiency: Skilled in back-end languages such as Python and Bash scripting for automation and customization. - Web Hosting & Development: Experienced in web hosting management and front-end development to complement network infrastructure. Certifications: MikroTik Certified Network Associate (MTCNA), MikroTik Certified Routing Engineer (MTCRE) About Me: Driven by a passion for technology and a commitment to excellence, I thrive in dynamic environments where I can leverage my skills to solve complex challenges and drive business success. With a keen eye for detail and a proactive approach to problem-solving, I ensure that network infrastructures not only meet current needs but are also scalable and adaptable to future requirements.

  • VPN
  • Wireless Network Implementation
  • Network Engineering
  • Asterisk
  • MySQL
  • Microsoft SQL Server
  • VICIDIAL
  • Computer Network
  • Mikrotik RouterBOARD
  • MikroTik RouterOS
  • Network Design
  • MikroTik
Isabelle S.

Lliber, Spain

$35/hr
4.5
466 jobs

I’m Norwegian, living in Spain, working as a freelance English - Norwegian (Scandinavian, SE/NO/DK) translator. My native language is Norwegian and English is my working language. As an engineer, writing is a part of the main role and to do research in al kind of different languages is common. Freelance Contracts that I have or had at the moment: Casino Tech-Mech Solutions Ongoing, Scale AI project Ongoing, VPNoverview.com webpage, TaxDome SE/NO/DK Ongoing, inlingua Utah Reflux Classifier, norske-casinoer.online (Norwegian Bestcasinos) or CasinoDaddy, Swedish Slotos UAB and IT Magic ApS. I’m still available for more work. I have done translation now for over 9+ years with good experience. The translation software I can use is WordPress, Lokalise, Shopify, Livewords, Crowdin, MemoQ, Memsource, SLR files, SRT files and Microsoft Excel & Word. CAT tools are SmartCat, MateCat, Trados, Lilt, Workbench, Bureau works and XTM. I work from a Mac machine so the translation software has to be compatible with that. My capacity is 500-1000 words an hour depending on what the sources are. I have good experience with gambling and casino pages, I translated the whole Bestcasinos webpages from English and Swedish to Norwegian. Specialist with a special interest in VPNs, cybersecurity, Antivirus and Bitcoins. With my background as a Principal Drilling Engineer I've got a good understanding of what team work entails. I am educated Petroleum Engineer with 12 + years experience from oil companies. I have a wide understanding of how to use research platforms, know project plannings, good understanding on how to full fill a project safe by deadlines and should be an important part of the job that the Translator & Editor need to be. Are used to be working in teams and have good adaptability. I'm flexible with my working hours and am happy to work closely with any existing freelancers you work with. I look forward to hearing from you!

  • Norwegian to English Translation
  • Danish to English Translation
  • English to Swedish Translation
  • WordPress
  • English to Norwegian Translation
  • Swedish to English Translation
  • Microsoft Visio
  • Microsoft Word
  • Microsoft Excel

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