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An RTOS, or Real-Time Operating System, is a specialized operating system designed to process data and events in real-time, guaranteeing precise timing and predictable behavior. It's essential for applications that require immediate responses, such as embedded systems, IoT devices, robotics, automotive systems, aerospace, and medical devices. RTOS Programmers are experts in developing and optimizing software for these time-critical systems, ensuring reliability and efficiency where every millisecond counts.
Looking to bring your project to life with the precision of a seasoned RTOS Programmer? The best way to find a quality RTOS Programmer is on Freelancer. Freelancer has the widest range of RTOS Programmers for hire, catering to every budget and project size. With Freelancer's Milestone Payment system, you only pay when you're 100% satisfied. Start your project today by posting a job
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8.7
8.7
91%

Tirumangalam, India
$25 USD per hour
Osiz Technologies is a premier software development company with over 16 years of industry expertise, dedicated to delivering innovative and robust solutions. Our dynamic team of 300+ professionals specializes in a wide range of services, including Web Development, AI, Blockchain, Game Development, and more. We have a diverse team of in-house 2D & 3D designers, Blockchain, NFT, and Metaverse developers, all working together to provide high-quality, cost-effective, and cutting-edge open-source development solutions to clients across the globe. ✔️Web Development - Frontend: React.js, Angular, Vue.js, JavaScript, HTML5, CSS3 (Bootstrap) - Backend: Node.js, Python (Django, Flask), PHP (CI, Laravel, Symfony), Ruby on Rails, Java (Spring), Next.js, - Express.js - Databases: MySQL, PostgreSQL, MongoDB, SQLite - CMS: WordPress, Joomla, Drupal - E-commerce: Magento, Shopify, WooCommerce, OpenCart ✔️Mobile App Development - iOS: Swift, Objective-C - Android: Kotlin, Java - Cross-Platform: Flutter, React Native, Xamarin ✔️Blockchain Development - Blockchain Platforms: Ethereum, Hyperledger, Binance Smart Chain, Polkadot, Solana - Smart Contracts: Solidity, Vyper, Rust - Wallets: MetaMask, Trust Wallet, Ledger - Frameworks: Truffle, Hardhat, Brownie ✔️Artificial Intelligence & Machine Learning - Languages: Python, R, Java - Libraries/Frameworks: TensorFlow, PyTorch, Keras, Scikit-Learn, NLTK, SpaCy - Tools: Jupyter Notebook, Google Colab, IBM Watson, Azure ML ✔️Game Development - Engines: Unity, Unreal Engine, Godot, CryEngine - Languages: C#, C++, JavaScript - AR/VR: Vuforia, ARKit, ARCore, Oculus SDK ✔️Metaverse Development - 3D Modeling: Blender, Maya, 3ds Max - Virtual Worlds: Unity, Unreal Engine - Blockchain Integration: Ethereum, Flow, Binance Smart Chain ✔️E-commerce Solutions - Platforms: Magento, Shopify, WooCommerce, OpenCart - Payment Gateways: Stripe, PayPal, Square, Authorize.Net - Languages: PHP, JavaScript, Ruby, Python ✔️UI/UX Design - Tools: Adobe XD, Figma, Sketch, InVision, Axure RP - Prototyping: Marvel, Proto.io, Balsamiq ✔️Cloud Computing Solutions - Platforms: AWS, Microsoft Azure, Google Cloud Platform (GCP) - Containerization: Docker, Kubernetes - DevOps Tools: Jenkins, GitLab CI/CD, Terraform, Ansible ✔️Enterprise Solutions - ERP Systems: SAP, Oracle, Microsoft Dynamics, Odoo - CRM Systems: Salesforce, HubSpot, Zoho CRM, Microsoft Dynamics CRM - Languages: Java, C#, Python, PHP - Databases: Oracle, SQL Server, MySQL, PostgreSQL ✔️Digital Marketing - SEO Tools: Google Analytics, SEMrush, Ahrefs, Moz - Social Media: Hootsuite, Buffer, Sprout Social - Content Marketing: WordPress, Medium, HubSpot We are available 24/7 to discuss any of our services with you. Just shoot us a message and we’d be happy to help.

6.1
6.1
93%

Surat, India
$35 USD per hour
One stop solution for Electronic Product Development. Component selection, Circuit Design, Schematic design, PCB layout, PCB Assembling, Prototyping, Firmware development, Testing, Cloud Integration, Mobile Application Development. Expertise in IoT product development and Firmware update Over The Air (OTA). Languages: C, C/C++, Python, HTML, Javascript -> Arduino -> Raspberry Pi -> ESP32, ESP8266 (ESP-NOW, ESP-MESH, ESP-MATTER, ESP-IDF, ESP-ADF) -> NRF51822, NRF52840, NRF52832, NRF52833 -> IOT Gateways -> ROS -> Remote Monitoring & Controlling -> WiFi, BLE, Ethernet, GSM/GPRS, 2G, LTE, LORA, LORAWAN, NB-IOT, DLMS, Profibus, IEC-104 -> HMI Display GUI Development -> Nextion, DWIN Displays -> Home Assistant, ESP-HOME -> Custom webserver hosting on ESP32/ESP8266 -> UART, SPI, I2C, ADC, DAC, RS-232, RS-485 -> Micro SD, Thermal Printer, Motors, Relays, Valves -> MODBUS RTU & TCP/IP -> CANBUS -> Schematic and PCB Layout Design -> ARM Cortex M3-M4 -> STM32F1, STM32F4, TM4C123G(TIVA C) -> ATmega 8-16-32-128-256 -> Renesas RL78 Series MCUs -> PlatformIO, CubeMX, Keil, Arduino, CCS, Atmel Studio, CS+ -> Altium, Eagle CAD, KiCAD, EasyEDA

5.5
5.5
92%

Bangalore, India
$10 USD per hour
Electrical and electronics engineer. Good at Microcontroller programming PLC programming Research to get solution for customer Embedded C for PIC , 8051, AVR , ESP32/ESP8266/STM32 Interrupts, timer etc Interfacing with relay, opto etc RTOS freeRTOS and others

6.4
6.4
100%

Nagpur, India
$35 USD per hour
I’m an Embedded Systems Developer with over 13+ years of hands-on experience designing reliable, efficient, and production-ready firmware for microcontroller-based products. From writing modular, event-driven C++ code on Arduino,STM32 and ESP32 to building complete low-power systems with sensors, motors, data logging, and communication protocols — I bring deep expertise in embedded development that bridges hardware and software. I have expertise in designing electronic products and thus successfully developed automation solutions for solar plants, PLCs, data loggers, SMPS, VFDs, and much more. My Expertise ✅ Firmware Development – Industry-leading high-quality, optimized, and fail-safe firmware for microcontrollers and embedded systems, MicroPython & Python-based IoT firmware (ESP32 MicroPython, Raspberry Pi) ✅ PCB Design – Eagle, KiCad ✅ Microcontrollers & Embedded Systems – STM32, NRF, ESP32, ARM, Raspberry Pi, Orange Pi ✅ FPGA - worked with Artix 7, Lattice LCMXO2 , Spartan. (HDL coding, mainly verilog and vhdl) ✅ IoT & Connectivity – ESP8266, ESP32, LoRa, Zigbee, Wi-Fi, RF Wireless ✅ Industrial Automation – Designed PLCs, Data Loggers, SMPS, VFDs, Predictive Maintenance System ✅ Communication Protocols – MODBUS RTU, CAN Bus, TCP/IP, UDP ✅ Software Development – 1. GUI development using VB.NET in Visual Studio for device communication 2. Android apps for embedded devices 3. FreeRTOS, Zephyr RTOS I take pride in my highly optimized firmware development process, which ensures precision, reliability, and long-term stability for mission-critical applications. Check out my portfolio to explore our work. Let’s discuss how we can bring your project to life with my expertise!

5.9
5.9
97%

Ulhasnagar, Thane, India
$30 USD per hour
1. Interested in IoT projects, artificial intelligence, machine learning, natural language processing, reinforcement learning etc. 2. I have worked on many projects involving MQTT with various MQTT brokers such as Mosquitto, Emqtt, Vernemq, AWS IoT etc. I am also a contributor of paho-mqtt python library. 3. Have made many messenger bots.

4.7
4.7
96%

Chandigarh, India
$30 USD per hour
I began my engineering career as an Embedded Developer. I have 7 years of experience in the field of embedded system and IoT(Internet of Things). Services : (One Stop Solution For All Technology Development Needs) * Firmware Development (Embedded C, C++, Python) * PCB Designing (Eagle, KiCAD, Altium) and Assembly (SMT & THT) * Schematic Design & Development (Research & Development) * Product Development & Manufacturing Services * Embedded & IoT Development * 3D CAD Designing & 3D Printing Service Technologies: * Internet of Things(ESP8266, ESP32, Zigbee, LoRa, BLE, GSM modules) * 8051 Family of Controllers(Keil uvision) * PIC Family (MPLAB) * AVR Family (Atmel Studio) * Arduino (Arduino IDE) * Raspberry pi (Development on Linux Based boards) A multi-skilled developer can turn your ideas into physical products with on time project delivery. Below are some of my projects over the past years.

5.2
5.2
95%

Gurgoan, India
$30 USD per hour
I am a skilled embedded systems developer with expertise in firmware, hardware integration, and embedded software. With over 6 years of experience, I specialize in developing real-time systems and IoT solutions, integrating software and hardware for industries like telecommunications, disaster risk management, and smart healthcare. Core Expertise: Embedded Software & Firmware: Proficient in Embedded C, C++, Python for microcontrollers like STM32, Arduino, ESP8266, ESP32, Raspberry Pi, AVR, ARM, TI, and Atmel. I create efficient, scalable firmware for real-time systems requiring precise control over hardware components. Hardware Design & Integration: Experienced in designing custom PCBs using KiCAD, easyEDA, Altium, EagleCAD, etc. I integrate sensors and modules into systems for real-time data collection using platforms like Raspberry Pi and Arduino, interfacing them with microcontrollers for IoT-based solutions. Driver Development: Expertise in developing device drivers for protocols like UART, I2C, SPI, CAN, and Ethernet, ensuring smooth hardware-software communication for embedded systems. IoT Systems: Developed scalable IoT solutions utilizing GSM, LoRa, GPS/GPRS, WiFi, LoRaWAN, and Bluetooth. Debugging & Troubleshooting: Skilled in debugging with GDB and troubleshooting complex embedded systems, ensuring optimized performance and reliability. ✔ Embedded Systems Development ☑️ Programming Languages: Embedded C, C++, Python, PHP, SQL, ☑️ Scripting Languages: Shell, C#, Bash, Expect Script. ☑️ Drivers Development - I2C, SPI, CAN, UART, PCIe, AXI, DMA, Interrupt Controllers ☑️ Embedded Linux - Yocto , BitBake, RTOS ☑️ IOT application development - BLE, LTE 4G, 5G, GSM, LoraWAN, Zigbee, WiFi & Wifi6 ☑️ Cloud Integrations - GoogleCloud, Azure, AWS ☑️ Hardware Design - PCB , High Speed, Antennas & FPGA's ☑️ Hardware Design & Verification Services - RISCV SoC design & verification ☑️ Hardware: Arduino, ESP8266, ESP32, Raspberry Pi, AVR, ARM, PIC, Atmel, STM32 ☑️ Design Tools: KiCad, easyEDA, EagleCAD, Altium, GDB, Keil, Arduino Studio, XAMPP, Visual Code.

5.6
5.6
100%

Ahmedabad, India
$30 USD per hour
With over 13 years of expertise in embedded systems design and development, I specialize in delivering cutting-edge hardware and firmware solutions across a range of industries. My core competencies lie in: **Key Expertise** • Hardware Design & Development: Specializing in multi-layer PCB design (up to six layers), and leveraging industry-standard tools like Altium Designer, Cadsoft Eagle, and KiCad. • Firmware Development: Proficient in embedded C, C++, Python, and Shell scripting for microcontrollers and microprocessors, with a focus on optimizing performance for real-time systems and IoT applications. • Wireless Technologies Expert: Extensive experience in developing IoT products using WiFi (2.4GHz, 5GHz, 6GHz), BLE, Cellular (2G/3G/4G/LTE, NB-IoT), GPS/GNSS, ZigBee, LoRa, UWB, and more. • Protocols & Interfaces: Deep understanding of I2C, SPI, UART/USART, RS232, RS485, CAN, TCP/IP, J1772, with practical application in wireless communication and sensor integration. • IoT Solutions: Proven track record in delivering IoT-based solutions with seamless integration of wireless modules and sensors, ensuring reliability in real-world applications. • Cross-platform Development: Hands-on experience with various platforms including Raspberry Pi (zero/2/3/4), Beaglebone Black, STM32F, and ESP32, and operating systems like Windows, Linux, and RTOS variants (FreeRTOS, Zephyr, TI-SIMPLELINK). **Specialized in Wireless SoCs** Texas Instruments: CC2530, CC2640R2F, CC2650, and more. Nordic Semiconductor: nRF51822, nRF52840, nRF9160, nRF5340, among others. Espressif: ESP8266, ESP32-S2/S3/C6, with experience in ESP-IDF and Arduino-based development environments. **Advanced Sensor Integration** Proficiency in integrating a variety of sensors, from environmental (temperature, humidity, pressure) to motion (accelerometer, gyroscope), and health-related sensors (heart rate), with a deep understanding of their interface protocols and power optimization. **Evaluation & Development Boards** Experience with a range of development platforms including ESP32, nRF52, Arduino, STM32, Raspberry Pi, and Beaglebone, ensuring versatile project implementation from prototyping to deployment. My experience extends beyond just technical prowess—I bring a problem-solving mindset, a drive for innovation, and a commitment to delivering robust, scalable solutions for next-gen embedded systems.

5.5
5.5
100%

Pune, India
$15 USD per hour
Proficient software developer with 12+ years of experience in mobile and embedded software & system design, development and integration. I am a graduate in Computer Engineering from a premiere national institute with demonstrable experience in design and development of complex commercial software and systems. My areas of strength are: Android app development, C, C++, Linux, Qt, System Programming, Scripting, Embedded/Real-time systems, Algorithms, Human Machine Interface, Software Integration. Samples of my past work in the industry include - * Development of android mobile apps. * Development of messaging app in MotoRockr mobile platform. * Development and System integration of satellite-based mobile protocol stack on iSatPhone Pro. * Design and development of system controller for real-time underwater surveillance system for Indian Navy. * Qt-based desktop applications. My google play store page: https://market.android.com/developer?pub=Zendroid
An RTOS programmer is a firmware engineer who designs, writes, and debugs software that runs on real-time operating systems to deliver deterministic, time-critical behavior on embedded hardware. These specialists build the low-level code that powers medical devices, automotive controllers, industrial automation, drones, and IoT products where missed deadlines mean failure.
Hiring a real-time operating system developer means bringing in someone who can guarantee that your hardware responds within strict timing windows. Unlike general-purpose software engineers, an RTOS specialist works at the intersection of hardware and software, scheduling tasks, managing interrupts, and tuning kernel behavior so your product performs reliably under load.
Typical deliverables from a freelance RTOS programmer include board support packages, device drivers, task and thread architecture, inter-process communication layers, bootloaders, firmware over-the-air update systems, and full embedded applications running on microcontrollers. They also produce timing analyses, memory maps, unit tests, and documentation that downstream engineering teams can maintain.
An experienced RTOS engineer will be fluent across several real-time kernels and the toolchains used to build for them. The exact stack depends on your hardware target and certification requirements.
An RTOS freelancer can take on discrete firmware modules or own an entire embedded software stack from bring-up to production. The work is highly specific and tied closely to the hardware you are building.
Real-time firmware sits inside almost every connected and safety-critical product on the market. Buyers commissioning RTOS work typically come from regulated or hardware-heavy sectors.
Strong candidates show evidence of shipping firmware to production, not just academic exposure to embedded C. Look at the depth of their portfolio, the chips and kernels they have actually used, and how they reason about timing and concurrency.
Useful interview questions to copy and use:
Freelancer.com gives you access to a global pool of embedded firmware engineers across every major RTOS, MCU family, and industry vertical. Whether you need a short driver port or a full firmware build for a new product, you can compare portfolios, ratings, and verified credentials side by side. Clients set their own budgets and receive competitive bids, and Milestone Payments protect funds until deliverables are accepted. The scale of freelancers on Freelancer.com means you can find specialists in niche kernels like ThreadX or QNX as readily as mainstream FreeRTOS or Zephyr engineers.
Hiring an RTOS programmer is more technical than most software hires because the work is tightly bound to specific hardware and timing requirements. The clearer you are about your MCU, kernel, peripherals, and acceptance criteria, the more accurate the bids will be. Follow the three steps below to attract qualified embedded firmware engineers and award the project with confidence.
Your project brief is the single biggest determinant of bid quality. A vague post attracts generic embedded developers, while a specific brief filters for engineers who have actually worked with your kernel, MCU, and peripherals. Head to the
Bids are short proposals, not just price quotes. They reveal how each candidate interprets your brief, what architectural approach they would take, and what timeline they consider realistic for the firmware scope. Read carefully and shortlist the engineers whose understanding of the work matches your requirements.
The final decision combines proposal quality with profile evidence. For embedded firmware, consistency across multiple shipped products matters more than a single impressive demo, because long-term maintainability and disciplined debugging come from repetition. Weigh portfolio depth, client reviews, and verified credentials together.
All RTOS programmers are embedded software engineers, but not all embedded engineers are RTOS specialists. RTOS work focuses specifically on real-time scheduling, deterministic timing, and kernel-level concerns, whereas general embedded development may involve bare-metal loops or higher-level Linux-based systems without hard timing guarantees.
A focused task such as writing a single driver or porting an existing application to a new MCU can take a few weeks. A full firmware development cycle for a new product, including bring-up, application logic, testing, and OTA support, typically runs several months depending on hardware complexity and certification requirements.
Yes. Many clients bring in an RTOS specialist for short engagements such as diagnosing a memory leak, fixing a priority inversion, reviewing task architecture, or auditing code for MISRA compliance. A clear brief with the symptoms, target hardware, and access to the codebase is usually enough to get accurate bids.
Choose an RTOS programmer when your product runs on a microcontroller with limited memory and requires hard real-time response, such as motor control or medical sensing. Choose an embedded Linux developer when your hardware is application-class with megabytes of RAM and the workload is closer to networking, video, or general computing.
FreeRTOS and Zephyr are popular for general IoT and consumer products thanks to permissive licensing and broad MCU support. ThreadX, QNX, and VxWorks are common where commercial support and safety certification matter. A good freelancer can advise based on your hardware, certification path, and long-term maintenance plans.

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