You will get Embedded Firmware development for nRF52, ESP32, STM32, CC2640, BLE, IoT
Project details
I am an expert on ESP32 and STM32 firmware development and hardware design
I can design PCB and develop the firmware as per your requirements. I have the following expertise:
1. Write custom requirement firmware development
2. Add secure DFU firmware update development
3. Write driver development for all the external sensors and peripherals
4. Write the library for UART, I2C, I2S, SPI communication protocols
5. Write BLE custom services to make data communication between BLE device and mobile application or device to device communication
6. STM32 and SEMTECH LoRa communication with LoraWAN gateway
Worked on the following STM32 MCUs:
1. High-performance MCU: STM32H7, STM32F7, STM32F4, STM32F2
2.MainStream MCU: STM32F0, STM32F1, STM32F3
3. Ultra Low power MCU: STM32L0. STM32L1, STM32L3, STM32L4, STM32L5
4. Wireless MCU: STM32WB, STM32WL
Programming IDE/framework:
1. For ESP32: ESP-IDF, AWS freeRTOS and Arduino
2. For STM32: STM32CubeIDE
I can design PCB and develop the firmware as per your requirements. I have the following expertise:
1. Write custom requirement firmware development
2. Add secure DFU firmware update development
3. Write driver development for all the external sensors and peripherals
4. Write the library for UART, I2C, I2S, SPI communication protocols
5. Write BLE custom services to make data communication between BLE device and mobile application or device to device communication
6. STM32 and SEMTECH LoRa communication with LoraWAN gateway
Worked on the following STM32 MCUs:
1. High-performance MCU: STM32H7, STM32F7, STM32F4, STM32F2
2.MainStream MCU: STM32F0, STM32F1, STM32F3
3. Ultra Low power MCU: STM32L0. STM32L1, STM32L3, STM32L4, STM32L5
4. Wireless MCU: STM32WB, STM32WL
Programming IDE/framework:
1. For ESP32: ESP-IDF, AWS freeRTOS and Arduino
2. For STM32: STM32CubeIDE
Project Type
Development, IT, QA, User TestingWhat's included
| Service Tiers |
Starter
$200
|
Standard
$500
|
Advanced
$1,000
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 8 days |
Number of Revisions | 1 | 2 | 3 |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$20 - $200
Additional Revision
+$20
40 reviews
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VS
Valentin S.
Apr 19, 2026
Embedded Hardware & Firmware Engineer - PCB Update + Testing
Outstanding embedded hardware and firmware engineer. Delivered high-quality work with excellent attention to detail. Strong expertise in PCB design, microcontrollers, sensor integration, and firmware development. Communication was clear throughout the project, deadlines were met, and all revisions were handled professionally. Highly recommended for any embedded systems project.
VS
Valentin S.
Mar 23, 2026
Hardware Development Expert for XR Lighting Application
Rajneesh has strong technical expertise in embedded systems and PCB design. He understands requirements quickly and provides efficient, practical solutions. His implementation was reliable and well-structured. Highly recommended for complex technical projects.
SC
Steve C.
Mar 18, 2026
Firmware and Hardware Calei
I have worked may years with Upwork, and try to be very fair, but this is the first time I have had been billed so many hour by a Individual/company and has not had any viable results due to his work. All you get from this individual is excuses, lots of talk, and not real results to make things right. He wants more hour added just to bill more. Its
JF
Jose F.
Feb 2, 2026
BLE Firmware Development with nRF52832 MCU
Really happy we found Rajneesh, serious, committed and sticks to timeline.
DS
Dhyey S.
May 8, 2025
Experienced Embedded Systems Developer for Low-Power IoT Device Firmware
It was a great experience working with Rajneesh on our Embedded IoT Firmware Development project. They demonstrated deep expertise in low-power embedded systems, sensor integration, and robust firmware design. Communication was clear and consistent throughout the project, and they proactively resolved challenges with professionalism and skill. The final firmware was well-documented, highly efficient, and met all of our technical requirements. We would not hesitate to work with them again and highly recommend them to anyone looking for a reliable and knowledgeable embedded systems developer.
About Rajneesh
Firmware & Hardware Design Specialist | BLE | nRF52 | CC2640 | ESP32
88%
Job Success
Ahmedabad, India - 8:54 am local time
If you need a BLE device, industrial controller, smart wearable, or connected IoT product. I can take it from concept to manufacturing.
I specialize in building reliable, low-power, scalable electronic products that are ready for real-world deployment.
End-to-End Product Development
• System Architecture & Component Selection
• Schematic Design
• Multi-layer PCB Layout (2–8 layers)
• Firmware Development (Bare-metal / RTOS)
• Sensor Integration & Calibration
• Wireless Connectivity
• Prototype Bring-up & Debugging
• Low Power Optimization
• DFM & Manufacturing Support
• Pilot & Production Assistance
Embedded Firmware Development
• C / C++
• FreeRTOS / Zephyr RTOS
• Bootloaders & OTA Updates
• Low Power Optimization
• Driver Development (SPI, I2C, UART, I2S, CAN)
• Modbus / RS485 / MQTT
• Battery Management & Power Profiling
Microcontrollers & SoCs
• STM32 (M0 / M3 / M4 / M7 / M33)
• ESP32 (Wi-Fi + BLE)
• Nordic nRF52 / nRF53 / nRF54
• TI CC2640 / CC2652
• Renesas / Dialog DA145xx / DA146xx
• NXP / PIC / ARM Cortex
BLE & Wireless Systems
• Bluetooth Low Energy (BLE)
• BLE Mesh
• Wi-Fi IoT
• LoRa / LoRaWAN
• Zigbee
• NB-IoT / LTE / Cellular
• Secure Device Provisioning
PCB & Hardware Design
• Altium Designer, KiCad, EasyEDA
• Schematic Design
• PCB Layout
• Gerber Files
• BOM Optimization
• Pick & Place Files
• Assembly Outputs
• DFM Review
• Mixed-signal Design
• RF Layout & Impedance Control
• EMI/EMC Considerations
Sensor & Interface Integration
• Environmental Sensors
• IMU / Accelerometer / Gyro
• Biometric Sensors
• Pressure & Gas Sensors
• High-speed ADC
• Protocols: SPI, I2C, UART, CAN, RS232, I2S
Industrial & Automation
• PLC Integration
• RS-485
• CAN Bus
• Motor Driver Circuits
• Industrial IoT Nodes
IoT Cloud & Mobile Integration
• AWS IoT
• Azure IoT
• MQTT / HTTPS
• OTA Firmware Updates
• Android / iOS Apps
• React-based Dashboards
Industry Experience
• Healthcare Devices
• Wearables
• Smart Home Systems
• Industrial Automation
• Automotive Electronics
• Agriculture IoT
• Retail Electronics
Why Clients Work With Me
• Strong Hardware + Firmware Combined Expertise
• Production-Oriented Design Thinking
• Deep BLE & Low-Power Specialization
• Clean, Maintainable Firmware Architecture
• Clear Communication & Reliable Delivery
• Focus on Long-Term Collaboration and Scalable Product Development
Steps for completing your project
After purchasing the project, send requirements so Rajneesh can start the project.
Delivery time starts when Rajneesh receives requirements from you.
Rajneesh works on your project following the steps below.
Revisions may occur after the delivery date.
Delivery
Will send you the complete project source code Hex files and user guide document