Embedded Systems / IoT Engineer (PAYGO Solar Project)*

@yaroslavmark

Hi, I am an embedded systems engineer with 9+ years of experience developing ESP32/STM32-based IoT devices, including energy monitoring and remote control systems. I have delivered 15+ connected products with MQTT/HTTP communication and OTA updates, and recently built a GSM-enabled power controller handling up to 10A loads with real-time backend sync and offline logic. I also have hands-on experience with relay/contactor control, energy metering ICs, and secure firmware design for field deployment. Approach ✅ I will define system architecture including MCU selection, energy metering interface, and relay/contactor control with protection design. ✅ I will develop firmware using ESP-IDF/Arduino with MQTT/HTTP communication, OTA update mechanism, and robust offline enforcement logic. ✅ I will integrate GSM/WiFi communication and implement anti-tamper detection with event logging and alert handling. ✅ I will support prototype bring-up, backend API integration, and validation under real operating conditions. Questions ✅ I want to confirm which energy metering IC/module you plan to use and its interface (pulse, UART, SPI). ✅ I need to understand expected load range and whether contactor control requires isolation or safety certification considerations. ✅ I would like to clarify backend communication preference (MQTT vs HTTP) and OTA update hosting method. ✅ I want to know if GSM is mandatory or optional alongside WiFi for deployment regions. Best, Yaroslav

@jimsufficiency

Hi, This aligns strongly with my experience. I have 6+ years in embedded systems, IoT, and power electronics, including ESP32/STM32 firmware, relay/control systems, and device-to-cloud integration. Relevant experience: * ESP32-based IoT systems * Power control hardware (relays, contactors, protection) * Sensor/energy-style data acquisition and processing * Offline-first firmware with fail-safe logic * Full hardware + firmware development and prototyping How I’d approach it: * Robust firmware (ESP-IDF/STM32) with offline enforcement logic * Secure communication with backend (MQTT/HTTP + retry strategy) * OTA update pipeline with rollback safety * Anti-tamper detection (power bypass, enclosure events, anomalies) * Reliable integration with energy metering IC/module Deliverables: * Working control box prototype * Firmware integrated with your ASP.NET backend * Documentation (setup, API, firmware logic) I can support both hardware and firmware to ensure a complete, deployable system. Availability: Immediate Engagement: Milestone-based Best regards, Jesutofunmi

@GameOfWords

With an extensive background spanning over nine years, I bring to the table a unique blend of expertise that seamlessly combines modern web development with AI-driven solutions - a perfect marriage that your project demands. My proficiency in ASP.NET, C Programming, and C++ Programming will enable me to take up this project through direct and meaningful API integrations that will guarantee efficient power control ergonomics for your solar system. The technical requirements for this job outline several areas where I can excel. Being well-versed in embedded C/C++, I have a strong command over relevant microcontrollers like ESP32-like systems - which stands as an impressive addition to my skill set. My previous projects range from AI-integrated platforms to WordPress-themed, Elementor customized sites to WooCommerce store optimizations - all propelled by my expertise in React and Node.js. In addition, I take great pride in offering clear communication, fast turnarounds, and clean scalable solutions—all attributes essential when transforming ideas into tangible reality

@antonk52

With a keen ability to navigate the intricacies of complex technological systems, I specialize in developing innovative and highly-functional solutions that empower businesses just like yours. As an embedded systems and IoT engineer, my skillset is meticulously tuned to align with the responsibilities outlined in this project description. Ranging from developing firmware for microcontrollers such as ESP32/Arduino/STM32 to integrating hardware components, managing power control, incorporating communication protocols like HTTP and MQTT, and even building over-the-air update systems, anti-tamper mechanisms - my expertise harmonizes with your requirements. Over the years, I have accumulated solid experience working with various microcontrollers including the ESP32 - a proficiency that aligns closely with your specification. Drawing from my portfolio that showcases previous IoT and embedded projects along with their documentation, I hope to effectively communicate how my capabilities perfectly complement what you're looking for. Additionally, while I may not have direct experience in PAYGO systems or solar/energy projects per se, my adaptability and proven track record in successfully venturing into new domains assure you of a fast learning curve. With me onboard, rest assured of receiving deliverables that are not only précised but also future-proofed due to detailed documentation. I look forward to this exciting opportunity!

@shadabkhan92

As an embedded systems specialist with a focus on IoT implementation and AI integration, I keenly relate to the PAYGO solar energy system you aim to develop. Through my extensive experience in Arduino, C Programming and designing on ESP32/STM32 firmware, I can aid in developing a control box that seamlessly integrates with your ASP.NET backend system and manages real-time power. While I have a strong grip over key technical requirements such as OTA firmware updates, anti-tamper mechanisms, and IoT communication protocols, my unique skill lies in bridging the gap between AI-enabled systems and hardware using cloud platforms like AWS, Azure. This versatility allows me to envision an end-to-end solution for your project: from microprocessor-based code to API integration with your backend. In addition to my tech expertise, my team is well-versed in PCB prototyping aiding comprehensive hardware design. Therefore, collaborating with me would ensure efficient realization of not only the firmware and its integration but also a thorough documentation of the entire process – setup, API integration and viable firmware logic. With our pay-per-project engagement approach, you have full control over project scope and budget allocation.

@jakubf41

Hello, Your PAYGO solar control platform aligns perfectly with my background in smart energy, remote monitoring, and secure device control. I can develop a robust PAYGO control box using ESP32 or STM32, integrating energy metering, relay/contactor control, GSM/WiFi communication, and secure backend connectivity via MQTT or HTTP API. Core capabilities I can deliver: Embedded firmware (ESP-IDF / Arduino / STM32) Real-time kWh monitoring and usage control GSM/WiFi connectivity (SIM800/SIM7600, MQTT/HTTP) OTA firmware update system Reliable offline rule enforcement Anti-tamper detection and alerting Secure API integration with your ASP.NET backend Additional strengths: Power electronics and relay/contactor interface design PCB prototyping and hardware validation Cloud/IoT integration and remote diagnostics Scalable architecture for field deployment I have developed IoT systems for energy monitoring, remote asset control, smart metering, and industrial automation. My focus is on reliable, secure, and production-ready solutions. I would be glad to collaborate long-term and help bring this PAYGO platform from prototype to deployment. Best regards, Jakub

@khaledslah

Hello there I am expert in Embedded development I have time and potenitial to work on this project I prefer to talk further in chat

@engruhulajom

Dear Client, I’m an experienced full-stack developer with over 10 years of experience in web and mobile application development, specializing in building scalable, responsive, and high-performance solutions for diverse business needs. I understand you are looking for a reliable developer to build or improve your project, including web or mobile applications similar to CRM, dashboards, or APIs, and I have worked on similar solutions successfully. My skills in React, Vue, Laravel, PHP, Python, REST APIs, and database design ensure efficient and high-quality delivery. Feel free to share more details or ask questions. I’m ready to refine my approach to match your exact requirements. Looking forward to working with you. Best regards, Md Ruhul Ajom

@adisonw

Dear Sir, I am thrilled to bid your project. I can help design and prototype your PAYGO solar control box with ESP32 or similar microcontroller firmware, backend communication, energy tracking, power control, OTA updates, and offline rule enforcement. I have experience with embedded C/C++, ESP32, Arduino-style firmware, MQTT, HTTP APIs, WiFi/GSM communication, relay and contactor control, sensor integration, and IoT device-to-backend workflows. For your system, I would structure the firmware to read kWh usage from the energy meter, sync usage and payment status with your ASP.NET backend, control the relay safely, and keep working offline using locally stored credit or access rules. I can also implement OTA firmware updates, device status reporting, tamper alerts, and clear API integration logic so your backend developer can connect the platform smoothly. The prototype would include firmware, wiring logic, communication flow, testing notes, and documentation for setup and future deployment. One crucial question: have you already selected the energy meter model and communication interface, such as Modbus RS485, pulse output, or UART? That decision is important for accurate kWh tracking, firmware design, and hardware selection. Sincerely, Adison.

@MIndlabsAi6

Hello, I am Vishal Maharaj, a seasoned professional with 20 years of expertise in C Programming, C++ Programming, ASP.NET, and Prototyping. I have thoroughly reviewed the requirements for the Embedded Systems / IoT Engineer role and am confident in my ability to design and develop the control box integrating with the ASP.NET backend system. My approach includes developing firmware for microcontrollers, integrating hardware components, implementing communication protocols, ensuring offline functionality, and implementing anti-tamper mechanisms. I am well-versed in embedded C/C++, ESP32, IoT communication protocols, and OTA firmware updates. I am eager to discuss further details and collaborate on this exciting project. Cheers, Vishal Maharaj

@alluankit01

Hi, I can help design and build the PAYGO solar control box firmware and IoT communication layer for your ASP.NET backend. I understand the core requirement: the device must measure energy usage, communicate payment/usage status to the backend, control relay/contactor output, work offline when internet is unavailable, and detect tampering or bypass attempts. I can develop firmware for ESP32/Arduino/STM32 using embedded C/C++, integrate energy meters, GSM/WiFi modules, relay/contactor control, MQTT or HTTP API communication, OTA firmware updates, local rule enforcement, and alert reporting for tamper or connectivity issues. My approach would be to first define the device logic with your ASP.NET API team, then build a working prototype flow: meter reading → backend sync → PAYGO status check → relay control → offline fallback → tamper alert → OTA update support. I have experience with IoT device communication, microcontroller firmware, sensor integration, MQTT/HTTP APIs, and embedded control systems, so I can help take this from prototype to field-testable hardware. Best regards Ankit

@jagratip3

Dear Hiring Manager, I’m excited to apply for the Embedded Systems / IoT Engineer role for your PAYGO solar energy system. The opportunity to work on a real-time energy control and billing device integrating embedded hardware with an ASP.NET backend is exactly the kind of system-level engineering I specialize in. I have strong experience in embedded C/C++ development and IoT system design using ESP32 and similar microcontrollers. I’ve built connected devices that handle real-time sensor data, hardware control, and cloud communication in constrained and offline-first environments. Approach: I will design a robust embedded firmware architecture focused on reliability, offline enforcement logic, and secure backend communication. The system will be optimized for low-latency control of power components while ensuring safe operation even without internet connectivity. Nice-to-have experience I can bring: • IoT systems with cloud integration (AWS/Azure IoT-style architectures) • Experience with GSM modules like SIM800/SIM7600 for remote deployments • Understanding of energy monitoring systems and load control logic • Practical exposure to hardware debugging and field testing scenarios I’m available for long-term collaboration and can start immediately with system design and firmware architecture planning. Looking forward to contributing to your PAYGO solar platform. Best Regards, JP

@adily1

Hey , I just finished reading the job description and I see you are looking for someone experienced in Arduino, ASP.NET, Prototyping, Embedded Systems, C++ Programming, C Programming and MQTT. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am - 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Adil.

@dmytrom99pro

Hello, As an experienced and dynamic *Embedded Systems / IoT Engineer*, I'm uniquely equipped to tackle the intricacies of your PAYGO solar energy project. My strong command over C and C++ coupled with extensive experience designing control systems around microcontrollers like ESP32 and STM32 make me an ideal candidate. I can ensure seamless integration of your hardware components such as the relay/contactor, energy meter, and GSM/WiFi modules while establishing effective communication between devices and backend via HTTP API or MQTT. In addition to these core requirements, my familiarity with energy metering, power systems (AC/DC, relays, contactors), and OTA firmware updates will be put to good use in developing a reliable, offline functioning PAYGO system that includes anti-tamper mechanisms. I also have a good grip on IoT communication protocols like HTTP and MQTT that render me adept at handling communication channels between device and network. Furthermore, my experience with GSM modules like SIM800/SIM7600 is an added advantage for cellular communication purposes. Regarding deliverables, I will not settle for anything less than a fully-functional control box prototype tightly integrated with your ASP.NET back-end system plus all the necessary documentation. My extensive architectural experience comprising multi-tenant infrastructure design, secure authentication systems, and RBAC will ensure a well-rounded product. If awarde Thanks!

@vertechsolutions

Hi, I can fix your PAYGO solar IoT control box I've solved this exact problem many times. Here is what I will do: Design ESP32/STM32 firmware for relay control, energy metering, and real-time power rules. Integrate HTTP/MQTT communication with your ASP.NET backend, plus OTA update support. Build offline enforcement and anti-tamper detection for bypass alerts and safe operation. 10 days free support after delivery Milestone-based payment Reply "YES" and Best regards, syed ribal

@cindyviorinar

Hi there, I'm Cindy Viorina, an experienced Embedded Systems and IoT Engineer with extensive expertise in developing solutions that integrate hardware and software seamlessly. I am excited about the opportunity to work on your PAYGO solar energy system, as it aligns perfectly with my skills and passion for sustainable technology. I understand you are looking for someone to design and build a control box that will manage real-time power control. My background in embedded C/C++ programming, especially with microcontrollers like ESP32, positions me well to create firmware that can efficiently handle communication protocols such as HTTP and MQTT for your needs. I am also adept at implementing OTA firmware updates and ensuring devices maintain offline functionality, which are crucial for a reliable PAYGO system. I am ready to collaborate closely with your ASP.NET developers to ensure smooth API integration and promptly address any technical challenges. I am available for real-time communication according to your time zone and can provide a demo or initial portion of the project within 12 hours of commencement. Q1: What specific features do you envision for the anti-tamper mechanisms? Q2: Are there any particular energy metering components you prefer? Q3: What is your target timeline for the prototype delivery? Looking forward to your thoughts on this. Thanks, Cindy Viorina

@DngPhgNam

⭐⭐⭐⭐⭐ ✅Hi there, hope you are doing well! I have extensive experience developing embedded firmware for IoT devices using ESP32, integrating power control, energy metering, and communication modules with ease to create reliable smart energy systems. The most important part to successfully complete this project is seamless integration between the embedded control box and your ASP.NET backend to manage real-time power control effectively. Approach: ⭕ Design and develop firmware for ESP32 using embedded C/C++ with compliance to your hardware specifications ⭕ Integrate relay, energy meter, and GSM/WiFi modules for precise control and communication ⭕ Build a robust OTA firmware update mechanism ensuring offline device functionality ⭕ Implement anti-tamper detection and alert features for security ⭕ Collaborate closely with your ASP.NET developer for smooth API integration and backend communication ⭕ Provide comprehensive documentation and support through prototyping, testing, and deployment ❓ What communication protocol does your backend prefer primarily - HTTP API or MQTT? ❓ Do you have specific hardware components already selected or should I recommend suitable options? ❓ Are there any particular anti-tamper features or alert systems you envision? I am confident my embedded systems expertise and IoT integration skills will deliver a high-quality PAYGO solar control box prototype meeting your requirements efficiently. Kind regards, Nam

@mayr81

Hello, I’m excited about your PAYGO solar energy system and the opportunity to support your team with a robust embedded and IoT solution. I’ve built ESP32-based control systems integrating relays, energy meters, GSM modules, and secure MQTT/HTTP communication, making me confident I can deliver the control box you envision. I can design firmware that remains reliable offline, supports OTA updates, and incorporates anti‑tamper logic to protect your hardware in the field. My experience collaborating with backend teams, especially on API-driven architectures like your ASP.NET system, ensures smooth integration from device to server. I’m eager to help you prototype, test, and refine a fully functional PAYGO-ready control unit. Best regards!

@RavenDetector

Hi, I am Everett, an experienced Embedded Systems and IoT Engineer excited to apply for the PAYGO Solar Project. Having developed various IoT solutions, I am well-versed in creating firmware for microcontrollers like ESP32, and integrating hardware components essential for managing real-time power control. For your project, I will design a control box capable of handling the complexities of your system, including energy tracking and secure communications via GSM/WiFi. My approach will include developing robust firmware in C/C++, ensuring seamless communication with your ASP.NET backend through APIs or MQTT. I’ll also implement Over-The-Air updates and anti-tamper mechanisms to keep customer usage secure and reliable while maintaining offline functionality. I am available for real-time communication according to your time zone and can provide a demo of my work within 12 hours of project commencement. Q1: What are the specific energy meter models you plan to integrate? Q2: Do you have predefined measures for tampering prevention? Q3: What is the expected timeline for the initial prototype completion? I look forward to discussing your project further. Best regards, Everett