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Hire the best Bluetooth Freelancers in Ukraine

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Clients rate Bluetooth professionals
Rating is 4.8 out of 5.
4.8/5
based on 111 client reviews
  • $45 hourly
    • 5.0/5
    • (71 jobs)
    Main work profile: battery chargers, USB Power Delivery, analog interfaces for sensors, low and high-speed ADCs, Bluetooth and wired data exchange, onboard local power sources (step-up, step-down, etc...), making basic firmware for: STM32, ESP32, PIC, AVR using native frameworks or/and Arduino framework, libs for attached hardware. Optimizing schematics/PCB/BOM (simple IoT or simple devices based on most popular components) for fast and low cost assembly. Experience in electronics design - 19 years Deep knowledge in Altium Designer, KiCAD and P-CAD. Also can freely work in EasyEDA, Diptrace, Eagle, MultiSim
    Featured Skill Bluetooth
    ESP32
    Altium Designer
    Microcontroller Design
    Electrical Layout Design
    Circuit Design
    Arduino
    Digital Electronics
    C#
    Electronics
    Hardware Prototyping
    KiCad
    Embedded System
    Electrical Engineering
  • $35 hourly
    • 5.0/5
    • (25 jobs)
    Experienced in cross-platform and native mobile app development, admin panels, dashboards, cloud, IoT solutions, web applications, and back-end (REST API, MQTT, etc) I am a Team Lead of the CitrusDev team, a Ukrainian software development company with over 40+ mobile and web developers, designers, project managers, DevOps, and QA specialists onboard. This means that besides my programming skills, you always have access to a full-stack product design & and development team. More about CitrusDev: CitrusDev provides customized software solutions for IoT startups, SaaS companies, eCommerce stores, LMS, and enterprise clients worldwide. From building the product from scratch to extending the existing teams, we have expertise in a diverse set of open-source technologies and platforms to bring innovation in an agile fashion. Our team excels in Java, Kotlin, Swift, Flutter, React Native, PHP, Laravel, WordPress, React.js, and Vue.js. With over 40+ people, CitrusDev has either empowered client teams or delivered end-to-end development projects for brands from the Internet of Things, consulting, eCommerce, marketing, or eLearning industries and is recognized as a Top IoT Developer in Ukraine by Clutch. Mykhailo, CitrusDev Team Keywords: iOS, Android, Flutter, BLE, Bluetooth, Core Bluetooth, Dart, Swift, Java, Kotlin, ESP32, IoT development, Internet of Things, embedded systems, IoT solutions, IoT firmware, IoT cloud, MQTT, WebRTC,, ESP32, Raspberry Pi, nRF, Nordic Semiconductors, NB-IoT, LPWAN, LoRaWAN, Zigbee, IoT architecture, IoT security, sensor integration, IoT protocols, real-time data processing, wireless communication, smart devices, cloud integration, AWS IoT, Azure IoT, Google Cloud IoT, ThingsBoard, Node-RED, Kaa IoT, OpenHAB, Home Assistant, industrial IoT, IoT automation, remote monitoring, IoT gateways, AIoT, machine learning for IoT, data analytics, smart home, smart city, smart farm, smart agriculture, agritech, healthcare, smart industry, smart logistics, IoT dashboards, IoT consulting, device-to-cloud, IoT scalability, low-power IoT, IoT connectivity, mobile app development, IoT mobile apps, cross-platform IoT apps, Flutter, native Android, native iOS, NFC, GPS tracking, telematics, wearable technology, connected devices, smart sensors, IoT-enabled automation, PCB development, hardware design, circuit design, custom IoT hardware, IoT prototyping, embedded hardware development, IoT manufacturing, cloud-based IoT platforms, real-time IoT analytics, IoT data visualization, edge AI, fog computing, MQTT brokers, CoAP, LwM2M, IoT fleet management, thermal printers, barcode scanners, RFID, heart rate monitors, ECG sensors, temperature sensors, humidity sensors, gas sensors, motion sensors, accelerometers, gyroscopes, pressure sensors, environmental monitoring, smart wearables, industrial sensors, medical IoT devices, IoT-based tracking solutions
    Featured Skill Bluetooth
    Payment Functionality
    CSS
    Tablet
    Raspberry Pi Firmware
    STM32
    Flutter
    Internet of Things Software
    Internet of Things
    MySQL
    Internet of Things Solutions Design
    WordPress
    Android
    iBeacon
    Laravel
    iOS
    Android App Development
    Vue.js
  • $40 hourly
    • 5.0/5
    • (28 jobs)
    With over a decade of experience, I specialize in seamlessly integrating IoT technologies into software solutions, leveraging expertise in: • Wireless Communication Protocols: Proficient in BLE, Zigbee, LoRa, Matter, Thread and more for efficient device communication. • IoT Platforms: Skilled in AWS IoT, Azure IoT Hub, Google Cloud IoT Core, and IBM Watson IoT Platform for device management and analytics. • Embedded Systems Development: Experienced in firmware development for different chipsets and OS (ATMEGA, STM32F1xx, ESP32, EFR32, NXP IMX6, JN1569, NRF, TI PRI etc., ARM Cortex) FreeRTOS, Zephyr, IDF, Arduino, Linux etc. • Security: Implement robust measures including data encryption and authentication to safeguard IoT devices and data. • Mobile Development: Expertise in React Native, Flutter, and native iOS/Android development for intuitive mobile experiences. • UI/UX Design: Design visually appealing interfaces optimized for mobile devices, incorporating IoT data visualization. • Backend Development: Develop robust backend systems using Java/Python, Node.js, Django, and Firebase for seamless data synchronization and real-time communication. • CI/CD: Implement CI/CD pipelines with Jenkins, GitLab CI, Kubernetes (K8s), and Bitrise for automated build, test, and deployment processes. Committed to sustainable, high-quality development practices, I deliver innovative IoT solutions that drive success. Thank you for considering my candidacy, and I'm eager to collaborate with you.
    Featured Skill Bluetooth
    UI/UX Prototyping
    Azure DevOps
    AWS IoT Core
    Android
    iOS
    iOS Development
    Embedded System
    Cloud Services
    Mobile App Development
    Industry 4.0
    Smart Home Framework
    Healthcare
    Automotive
  • $50 hourly
    • 5.0/5
    • (21 jobs)
    I'm a mobile app developer with over 8️⃣ years of experience, and I love turning ideas into awesome apps. Outside of Upwork, I've launched 2️⃣0️⃣+ projects, so I've a good handle on building successful mobile experiences. I specialize in native iOS and Android but am also comfortable with cross-platform solutions. What I Do: 📱 Native iOS & Android app development (Swift, Kotlin) 🛠️ Cross-platform development (React Native, Flutter) ⚙️ Backend & API integration (Firebase, AWS, REST API) ✨ UI/UX design (Figma, Sketch) My Promise to You: 💬 Open and honest communication (regular updates, no surprises!) 🎯 Focus on your vision (I'll make sure your app matches your goals) 🐞 Quick and efficient bug fixes (because nobody likes glitches) I Can Help With: 🚀 Building your app (iOS, Android, or both!) 🔗 Connecting your app to backend systems 💡 Creating mobile solutions in Health & Lifestyle, Social, Business, EdTech and AI niches Let's Chat! 💬 📌 Don't hesitate to invite me at least for the best consulting Mobile App Development, iOS Development, Android Development, Cross-Platform Development, Flutter Development, Kotlin Development, Swift Development, Java Development, Software Development Agency, Full-Cycle Development, MVP Development, Product Development, App Maintenance, Software Consulting, Agile Development, API Integration, Backend Development, Cloud-Based Solutions, SaaS Development, UI/UX Design, HealthTech App Development, FinTech App Development, EdTech Solutions, E-commerce Mobile Apps, Social Media Apps, IoT Mobile Development, AI-Powered Apps, Accessibility Solutions, GPS & Location-Based Apps, Mobile Security & Encryption, REST API, Firebase, Google Cloud, AWS, BLE (Bluetooth Low Energy), Custom UI Development, Mobile App Security, Payment Gateway Integration, AI & Machine Learning, AR/VR
    Featured Skill Bluetooth
    Swift
    Kotlin
    AI Mobile App Development
    AI App Development
    Healthcare IT
    Flutter
    Native App Development
    Android
    iOS
    Mobile App Improvement
    Mobile App Bug Fix
    Mobile App Development Consultation
    Mobile App Development
    Mobile App
  • $35 hourly
    • 4.4/5
    • (7 jobs)
    I build and develop firmware. Reliable and easily scalable code architecture is my passion, built to the highest professional standards. I've a strong electronics engineer background with a good understanding of digital and analog electronics which helps me deal with complex tasks. My expertise and skills include: - Platforms: nRF52x, nRF53x, nRF91x, EFM8, EFM32, CC26x2 - Languages: C, C++, C++Builder, Delphi, Assembler MCS-51 - Tools, IDE: Visual Studio Code, Keil, Segger Embedded Studio, IAR, STM32CubeIDE, RAD Studio, etc. - Technologies, libraries: nRF Connect for VS Code, nRF5 SDK - RTOS: Zephyr, FreeRTOS, TIRTOS - FOTA (Firmware Over The Air): Nordic nRF52 - BT/BLE: u-blox Nina-B1, Holyiot 18010, Nordic nRF52x, SimCom SIM868, Texas Instruments CC2642/CC2652 - GNSS: u-blox SAM-M8Q, TranSystem EB-240, Trimble, Rockwell, etc. - Long range communication: GSM (GPRS/CSD/SMS), 3G/4G LTE (u-blox SARA-R4, SimCom SIM800/868/900, Siemens, Telit, etc.) - Short range communication: ISM (434 MHz, 868 MHz, 2.5 GHz), Bluetooth, NFC - Digital interfaces: USB, RS-232, RS-485, UART, SMB, SPI, I2C, 1-Wire, etc. - Source control: Bitbucket, Sourcetree, GitHub
    Featured Skill Bluetooth
    Zephyr
    Core Bluetooth
    Bluetooth LE
    Circuit Design
    Electrical Engineering
    nRF52832
    Embedded System
    Embedded C
    nRF52
    C++
  • $49 hourly
    • 4.8/5
    • (31 jobs)
    With over 20 years of experience in Electronics and Embedded systems engineering, I'm a wizard at turning innovative ideas into cutting-edge solutions. As the founder and lead engineer of High Technologies Solutions, I've led the development of more than 40 successful released into-production projects across North America, Western Europe, and Australia. Whether you're an inspired individual, a small start-up, or a large corporation - I'm passionate about helping you bring your ideas to life with tailored, and cost-effective leading industry-level solutions. Wearable and Smart Electronics, Home appliances, MedTech, EV, Green Energetic, and Industrial areas - I've worked on projects that have made a real difference in people's lives. What sets me apart is the all-in-one comprehensive service and my commitment to staying up-to-date with the latest industry trends and technologies. I'm always looking for new and better ways to approach a project, and I'm not afraid to think outside the box to deliver results that exceed your expectations. So, whether you're a tech guru or a non-tech individual with an innovative idea, I'm the one you can trust to bring your vision to life. Let's work together to make your dreams a reality! ✅ What I can do for you? - Electronics engineering - Prototyping - PCB design (Precision, Low Noise, Flexible, Multi-layer) - Hardware & Firmware engineering (Analog, Digital, Power) - Software, Mobile App, and Server solutions development - Technology and cost optimization - Mass production optimization Technologies stack (but not limited to): Hardware: STM32, ESP, nRF, TMS, FPGA, PLD / CPLD, AVR, Fujitsu, Z-80, AC/DC, DC/DC, Power Electronics Languages/ Technologies: Embedded C / C++, Assembler (Cortex-M, AVR), Reverse Engineering, PHP, RUBY, JS, Solidity, Mysql, NoSQL, Redis, HTML / CSS / SCSS, API integration, Web3, Сonsole C, Altium, KiCad, P-CAD, Sprint layout, Solidworks, Orcad, Diptrace Clouds: AWS IoT Protocols / Standards: GSM / GPRS / LTE, MQTT, SSL / TLS, HTTP / HTTPS, Bluetooth, WiFi, RF, TCP, GNSS, GPS Interfaces: I2C, SPI, UART, CAN, RS, SDIO, PWM, Analog, LoRaWAN, LVDS
    Featured Skill Bluetooth
    PCB Design
    GPS
    Mobile App
    Software
    Prototyping
    Circuit Design
    Internet of Things
    MQTT
    Driver Development
    Hardware Design
    Firmware
    Minimum Viable Product
    WiFi
    GPRS
    Electronics
    Analog Electronics
    Wireless Communication
  • $50 hourly
    • 5.0/5
    • (8 jobs)
    Delivered 100+ embedded & IoT products across healthcare, smart home, and industrial automation. Expert in STM32, ESP32, NRF, BLE, LoRaWAN, and edge AI. Focused on low-power firmware, secure connectivity, and production-ready hardware. Reliable Embedded Products from Prototype to Production With over 9 years of experience in embedded systems and IoT development, I support businesses building connected devices - from early PoC to cloud-connected, scalable solutions. My clients range from startups to industry leaders in smart agriculture, medtech, energy, and consumer electronics. I’ve led and contributed to 100+ embedded projects, helping clients reduce time-to-market, optimize power consumption, and meet high performance, security, and long-term maintainability standards. Custom Hardware Design & Power-Efficient Embedded Systems I specialize in the design of custom PCBs and low-power electronics using platforms like STM32, ESP32, Nordic, etc. Most of my hardware is built around multi-layer Altium or KiCad layouts with a strong focus on signal integrity, thermal design, and EMI shielding. For mobile and remote applications, I design energy-autonomous systems that combine DC/DC regulation, battery management, solar panels, and wind-based charging. Wireless connectivity is a core part of nearly every device I build using BLE, LoRaWAN, Zigbee, LTE-M, NB-IoT, and Wi-Fi depending on the use case. I also integrate wired protocols such as CAN, RS-485, and Modbus for industrial environments. Sensor integration includes everything from IMUs and PIRs to GPS, air quality, pressure, light, optical, and biomedical-grade sensors with full calibration and noise filtering handled on-device. I’ve developed systems that run reliably in the field for 2+ years on a single battery cycle. Embedded Firmware, RTOS, and OTA Infrastructure My firmware is built on Embedded C/C++ (and sometimes MicroPython), often on FreeRTOS or Zephyr. I’ve built dozens of projects involving custom driver development, power-optimized sensor sampling, OTA update systems, real-time control loops, and secure wireless communication. Projects include: A wearable emergency-detection bracelet with heart rate and GPS An STM32-based mesh-connected lamp post system with solar/wind autonomy A LoRa-enabled smart agriculture node using multiple sensor types with BLE backup OCR-based utility meter reader with edge-based image processing and local AI Where needed, I also implement OTA bootloaders with encryption, failover handling, and remote update diagnostics. Edge AI & Computer Vision for Smart Devices Several of my recent solutions have used embedded computer vision or AI logic on-device. I’ve implemented TensorFlow Lite and custom CNNs on Raspberry Pi and STM32-based platforms to enable real-time inference, including: OCR and character detection for meter reading Gesture detection and occupancy tracking Anomaly detection in air quality and power usage These edge AI systems allow for minimal cloud traffic and faster, more private decision-making directly on the device. Cloud-Connected Systems & IoT Security My clients rely on secure, scalable communication between devices and the cloud. I’ve worked with AWS IoT, Azure IoT Hub, ThingsBoard, and Tuya for remote device control, data storage, and analytics. I implement MQTT, HTTPS, and other lightweight protocols with end-to-end encryption and secure provisioning. I also design systems with Tuya Smart platform integration deployed in over 50 projects in smart home and automation domains to ensure compatibility, remote control, and user-friendly setup. Security isn’t an afterthought it’s part of the architecture. I use encrypted communication, signed OTA packages, and secure firmware boot strategies to reduce exposure to vulnerabilities in the field. From Prototypes to Production-Ready Solutions I support clients through prototyping, iteration, and scale-up including enclosure-ready 3D models, functional testing, and BOM optimization. I work with reliable manufacturing partners in the US, EU, and Asia for pilot runs and small-batch production. Let’s Discuss Your Next Embedded Project Whether you're developing a new wearable, a remote monitoring device, or an industrial automation tool, I bring a full-stack embedded mindset, technical depth, and reliable delivery. Ready to turn ideas into real-world hardware? Let’s talk.
    Featured Skill Bluetooth
    Arduino
    Raspberry Pi
    Python
    Electronic Design
    C
    Embedded C
    Electronics
    Firmware
    ESP32
    PCB Design
    Microcontroller Programming
    Circuit Design
    Electrical Engineering
    Embedded System
  • $35 hourly
    • 5.0/5
    • (53 jobs)
    Hello. Shortly my name is Olex. I’m mobile developer with more than 7 years of experience in the field of mobile development and more than 10 years of programming in general. I believe that my strongest skill is making things done. How? Responsibility and creativity, thinking about whole the project, not only codebase. And I like to finish my work, finish applications or features. I always think about my clients needs for first even if it's not best for me. I also care about end-user experience and always share my ideas or doubts about a project I make. I'm honest and fair. I'm confident and I'm actively using AI in my work that helps me to fasten my work up to 20%. Listed below are my experience and skills: I work mostly as front-end mobile application developer on platforms: • iOS, WatchOS, • Android, • Hybrid. I work as back-end developer using SAAS solutions: • Firebase • Amazon Web Service I use programming languages and frameworks as follows: • Swift, Objective-C - as native iOS development, • Kotlin, Java - as native Android development, • Flutter & Dart - for hybrid development. • React Native & Javascript or TypeScript - for hybrid development • NodeJS & Javascript - for back-end development • Python - for bak-end development I worked with most of mobile technologies and frameworks: • UI/UX - SwiftUI, UIKit, WatchKit, Lottie files, • Image creation, changing/processing - CGGraphics, CGAnimation, • Working with data - CoreData, Keychain, • Video creation, changing/processing (on the fly as well), streaming - AVFoundation, WebRTC SDK, • Device capabilities - Bluetooth / BLE, Location, Apple maps, Google maps, Push notifications, Network, tunneling, traffic management, HealthKit, • Working with payments - In-app purchases, Apple Pay, Shopify, Stripe, • Client-server communication - RESTful API, GraphQL, XML, JSON, Websockets, Sockets, Firebase SDK, AWS, • AI - MLKit, ChatGPT API I work with many professional tools, but mostly with: • Xcode & Cocoapods - iOS development tools, • Android Studio & Gradle - for Android development, • Visual Studio Code - for Flutter hybrid development • Git - version control. • Jira, Redmine, Trello, Slack, Bitbucket, Gitlab - as team tools. I have experience of Firebase back-end development with Javascript. I understand imperative and declarative, OOP principles of programming, a lot of architecture patterns, like MVC, MVVM, MVP etc. I have experience of publishing applications in both Appstore & Google Play. I have experience of team leading and project management.
    Featured Skill Bluetooth
    UI Animation
    UI Graphics
    Swift
    Objective-C
    Kotlin
    Amazon
    Firebase
    watchOS
    API Integration
    Android App Development
    iOS Development
    AI Chatbot
    ChatGPT
    Problem Solving
  • $40 hourly
    • 4.8/5
    • (16 jobs)
    Resume/C.V. More than 10 years of successful experience. 100% guarantee of success of the declared results. PLEASE TAKE INTO ACCOUNT - IN MY POTFOLIO ONLY THAT IS NOT PROTECTED BY A NON-DISCLOSURE AGREEMENT. FACTICAL VOLUME IS MUCH MORE. Electronic / Embedded Analyst. Electronic / Embedded Consultant. Electronic / Embedded hardware developer. Electronic / Embedded software developer. Abstract. Reverse Engineering Extra high quality result. Europe ready. Ability to develope robust, bullet-proof industrial/commercial solutions. Intuitive, extensive project leadership and hardware development experience. Superior skills in microprocessors and digital data communications design hardware Knowledge of most all modern interfaces (USB, Ethernet, LVDS, uSD, HDMI, DVI, VGA, UART,I2C, I2S, SPI, ets ) Strong expertise in debugging tools (JTAG, SWD, Remote System Explorer (Ethernet), HyperTerminal, Minicom ), Exceptional grasp of PCB design, signal integrity and power integrity Outstanding knowledge of modern CPU/MCU/DSP architectures. Excellent prioritization abilities, NDA. Core Qualifications: + Embedded C/C++; + RTOSes; + RF communication; + GPS monitoring; + ARM; + DSP; + PCB developing; + Ability soldering and coding simultaniously; + Familiar with Embedded Linux ( Boot process uderstanding, BSP modifieng/debugging); + Familiar with VHDL systems (Booting, running, etc ); + Familiar with Analysis of microwave systems (Agilent ADS); Complete production cycle, includes to: - analize, - choose components and architecture, - draw the schematics (Altium Designer), - Draw the PCB (Altium Designer or ORCAD) - Manufacturing control. - SMD soldering work (BGA, QFP, SMD up to 0201). - write all necessary software, - manuals and technical refference writing. Embedded processors (more then 10 years experience ). MICROCHIP: 8/16/32 bit; ATMEL:AVR, AVR32; 8051: MAXIM-DALLAS, ATMEL, Silicon Laboratories, others. Texas Instruments: Sitara, MSP430F, TMS320F). ARM Cortex: LM3S9Bx, STM32F, NXP (bootloading, firmware) FreeScale (MOTOROLA):(MC56F83xx, DSP56F80x). ARM V7:AM335x (bootloading, firmware) CAD (Software) CodeWarrior. KEIL-2 - KEIL-5. Code Composer 3 - CCS 6. ISE 6 (Xilinx) - ISE 14. Eclipce IAR 2004 - IAR6.5 CAD (Hardware) OrCAD 8.2.3 - OrCAD 16. PCAD 2004 - PCAD 2009. Altium 6.9 - Altium 2014 CAD (Mechanical) SolidWorks 2004 - SW2016. CAD (microwave) Agilent ADS 2004 - ADS 2009
    Featured Skill Bluetooth
    Prototyping
    Driver Development
    ESP32
    NFC
    Hardware Design
    PCB Design
    GPS
    Altium Designer
    Electrical Engineering
    OrCAD
    Embedded System
    Embedded C
    SolidWorks
  • $35 hourly
    • 4.6/5
    • (14 jobs)
    I am an embedded systems expert focused on firmware and software development. Over the last 18 years, I have designed the hardware a wide range of prototype and mass electronics devices using C/C++, RTOS, Embedded Linux, PCB and enclosure design. Engineering is also my hobby, and I have been doing it since before high school. In many of the devices have different wireless modules, such as GSM/GPRS, 3G, WiFi, Bluetooth, GPS, Lora and different microcontrollers (STM32, NXP, TI - Cortex-M3 Cortex-A8/A9, MSP430 Microchip - PIC32, DSpic33, PIC24, PIC18, Renesas RX,RZ Actel - Cortex-M, Atmel - ARM Cortex-M4, ARM Cortex-M7, Apollo, NRF52) technologies and protocols: SPI, I2C, UART, USB, CAN, RS-485, Etherne and so on. What I can do for you: I am very experienced with hardware design and firmware, which gives me the ability to integrate them more efficiently. Hardware: circuit design, component selection, electrical schematic, PCB payout. I am using Altium Designer. I will provide you with everything you need to go to manufacturing: Gerber files, NC drill, pick and place, assembly diagrams, 3D prints, 3D STEP model, electrical schematics as well and offer support after the project is completed too. I have experience with analog and digital design. I can run Spice simulations as well. Prototyping: I will manufacture the prototypes. I also have a lot of equipment: multimeters, oscilloscope, logic analyzer, USB protocol analyzer, power supplies, digital electronic load, soldering equipment, computers and so on... Firmware development: I have 18 years of experience firmware development. I can architect and develop your firmware from the ground up. I am exceptionally versed in line of microcontrollers: STM32, Renesas, TI, Nordic, Apollo, Microchip, NXP etc. I will provide you with production quality firmware. I can get firmware done very quickly and efficiently for these chips. Software development: Basic tools running in Linux/Windows, basic GUIs. I can develop all the software tools that you need for debugging, testing and manufacturing.
    Featured Skill Bluetooth
    Firmware Programming
    USB Electronics
    Digital Electronics
    Electronics
    Digital Engineering
    Electrical Engineering
    Analog Electronics
    Electronic Design
    Embedded C
    C
    Microcontroller Programming
    Embedded System
    Sensor
  • $35 hourly
    • 5.0/5
    • (88 jobs)
    As CEO/CTO of Tetalab with a Ph.D. in Computer Science, I lead a skilled team delivering cutting-edge solutions across IoT, mobile, and web platforms. 🔧 Technical Expertise: Full Stack Development (MERN Stack) Mobile App Development (iOS, Android, Cross-platform) IoT Solutions (ESP32, Arduino) Firmware & Embedded Systems Cloud Integration (AWS IoT) BLE & Wireless Protocols AI Integration 🏆 Key Strengths: Innovative problem-solving Rapid, high-quality delivery Strong team collaboration Client-focused approach 🌟 Specialized in: IoT system architecture & development Mobile apps Responsive web applications & dashboards Hardware-software integration BLE-enabled mobile solutions From concept to deployment, we excel in creating seamless, intelligent systems that bridge the physical and digital worlds. Let's transform your ideas into reality!
    Featured Skill Bluetooth
    Web Design
    CSS
    Web Development
    Bluetooth LE
    Embedded System
    Internet of Things
    JavaScript
    React
    Flutter
    Mobile App Development
    Smartphone
    Core Bluetooth
    iOS
    Android
  • $40 hourly
    • 5.0/5
    • (12 jobs)
    Nordic Bluetooth, Zephyr, nRF Connect SDK, nRF Mesh, Cypress/Infineon BT/WiFi, STM32, Silabs, Espressif ESP32, NEC/Renesas/Dialog, Atmel/Microchip, Arduino preferably. C/C#/Python Have over 11 years of professional experience in electronics development, embedded systems, hardware design, IoT. In past I have worked for prosperous Startup, manufacturer company and have designed electronics products from scratch to mass production. Experienced in development and testing of embedded systems. MCU: Nordic nrf52 BT SoC. Espressif ESP32 WiFi BT. Cypress/Infineon PSoC6 BT/WiFi WICED ST STM32 F0, L4, L4+ Cortex-M0-M4. ST Bluetooth 5 BLUENRG-2 SiLabs (Energy Micro) EFM32 ARM Cortex-M3 Atmel AT90S, ATtiny, ATMEGA, XMEGA.. Microchip 12F, 16F, 18F. Renesas/Dialog (Nec) 78k. DA. Rockchip. Development Tools - Eclipse - IAR - CodeVisionAVR - Keil µVision IDE. - Visual Studio - Altium - GCC - CCS C Compiler - Arduino VERSION CONTROL/BAG TRACKING - SVN - Git - Jira - Asana
    Featured Skill Bluetooth
    Wearable Technology
    Atmel AVR
    PCB Design
    Hardware Prototyping
    Sensor
    WiFi
    ESP32
    Embedded Linux
    Embedded C
    nRF52
    Arduino
  • $45 hourly
    • 5.0/5
    • (23 jobs)
    10 years of Mobile development experience in technologies: Android, Flutter, Kotlin Multiplatform, Compose Multiplatform. I developed Flutter applications for police tablets for government, health care project to work with HRM/BPM and Android applications for smart sockets (with GSM-module) and smart devices to measure temperature (connect via Bluetooth and Wi-Fi), health care app for people with bipolar disorder, apps with video transcoding (mobile FFMpeg), advertising platform for TV, social network based on location, cloud storage, manage orders for loaders, time trackers for employees.
    Featured Skill Bluetooth
    Google Maps API
    Kotlin
    Bluetooth LE
    Firebase
    Java
    Android Studio
    Dart
    Android SDK
    Android App Development
    Flutter
    Unit Testing
    Android
    Android Room Persistence
  • $40 hourly
    • 5.0/5
    • (2 jobs)
    Looking for a mobile or server developer? I am running a software agency with highly skilled devs who have 10-15 years of experience and thousands of man-hours in app development in different business areas (Healthcare, Finance, E-commerce, Fitness, E-Learning and different types of business apps). We are ready to bring your ideas to life and help your business growth. Key facts: • Over 300 successfully completed projects (in iOS, Android, PHP, react native/js) • Successful apps on the marketplaces • Managed successfully about projects from the design to launch • Hundred Thousands of man-hours and more than 200 happy customers. • Mobile Software Development (native/hybrid) • Web Development (Full stack PHP, React, Node etc)
    Featured Skill Bluetooth
    Health & Fitness
    React Native
    Android
    iOS
    Sensor
    Android App Development
    iOS Development
    Mobile App Development
    React
    JavaScript
    PHP
  • $40 hourly
    • 4.9/5
    • (4 jobs)
    Hello everyone, I am an electrical engineer - hardware & firmware developer with the many years of rich experience working on various challenging projects. As an accomplished professional with over 10 years of experience, I have successfully led numerous embedded design projects from concept to completion, ensuring their compliance with industry standards and best practices. Extensive skills and experience in the electrical and IoT fields combined with the ability to use hardware design tools such as Altium Designer, KiCad, CST and firmware development tools such as PlatformIO, Arduino IDE, Vivado IDE to meet the specific requirements of various applications. I have made it possible to efficiently develop IoT projects that meet the requirements. Additionally, throughout my career, I have integrated custom hardware design and firmware to suit embedded system configurations, integrating all areas from product design to firmware development and device testing. My expertise extends to hardware design, including schematic design, PCB layout, and signal integrity analysis, enabling me to fully comprehend the entire electronic design process. And I not only designed hardware using circuit design tools such as Altium designer and KiCad, but also had experience conducting PCB/PCBA for prototype and mass production and assembly at inexpensive and fast manufacturing companies such as Eurocircuits, JLCPCB, and PCBWay. I have a deep understanding of programming languages such as C and C++, python, vhdl and have successfully developed firmware for various microcontrollers and processors. Based on my skill and experience, I can complete your idea from prototype to the final scalable and mass producible product. I have strong skills in the following fields.  PCB design - Multilayer PCB - Altium designer, KiCad, Eagle, CST - Temperature, Humidity, Air quality, microwave Sensors (BME280/BME680, SEN55-SDN-T, RFbeam Microwave K-LD2 Radar), TFT LCD  Firmware development with Microcontroller/Microchip - TMS32 DSP, PIC32, RP2040 - ESP32, WLR089U, RN2903, SX1260 - nRF Nordic chip like nRF5340, nRF52840 BLE chip, nRF9160, nRF7002 LTE/Wi-Fi/GNSS - Wi-Fi, Bluetooth, LoRa module, Quectel EC21 LTE/GSM module - Arduino IDE, PlatformIO IDE, Visual Code Studio, MplabX IDE, Microchip studio, - Raspberry Pi, ATmega328, Teensy, ATtiny - C/C++, Micropython - OTA using MQTT or Restful API of wireless communication  FPGA - Xilinx-7 series FPGA (Spartan-7, Vertex-7, Artix-7) - Zynq-7000 series SoC - Vivado IDE, Xilinx ISE, Vivado HLS - Altera series FPGA (Cyclone FPGA) - Quartus II, ModelSim - Lattice FPGA, Lattice Diamond - VHDL, Verilog HDL, System HDL  Wireless - LoRa, Wi-Fi, Bluetooth, nRF  IoT Smart Products - Smart doorbell system - Home assistant automation - Smart plug & socket - MPPT solar energy charging system, EV charger, AC/DC powered Relay - Assert tracker, traffic counter, lightshow for music visioning By utilizing my strong project development, management skills and technical expertise, I will successfully provide a highly reliable and efficient system that greatly enhanced the image quality and speed of the device. I'd like to thank you for reading my profile kindly. Thanks.
    Featured Skill Bluetooth
    MQTT
    Xilinx
    PCB Design
    Internet of Things
    KiCad
    Altium Designer
    STM32
    Python
    LoRa
    WiFi
    ESP32
    Arduino
    FPGA
    Firmware
  • $25 hourly
    • 4.6/5
    • (1 job)
    ANDROID/FLUTTER DEVELOPER Experienced Android developer with a wide range of skills, including Java, Kotlin, Flutter, and Dart. Expertise in REST API, Web Sockets, Push Notifications, JSON, XML, Retrofit2, OkHttp, Ktor, Realm, Room, SQLite, DataStore, Firebase, Google (login, analytics, map, places), Facebook, Google (login), RxJava/RxAndroid, Hilt/Koin, ViewBinding, Coroutines, Flows, Channels, Crashlytics, Google Analytics, Firebase, custom Wi-Fi and Bluetooth low energy (BLE) hardware integration. Strong understanding of SOLID principles, Android Design Principles, Android Style Guide/Material Design, Architecture Components, and Jetpack Compose.
    Featured Skill Bluetooth
    REST API
    Bluetooth LE
    Bluetooth Beacon
    Android App
    Android SDK
    Push Notifications
    Dart
    Python
    Kotlin
    Java
    Core Bluetooth
    Flutter
    Android App Development
    Android
  • $25 hourly
    • 4.8/5
    • (168 jobs)
    100% project completion rate! Top-rated developer! 12 years of experience in application development! Click HIRE, and I will bring your idea to life! And a little bit of​ technical info about me (don't forget to ask if you are looking for something specific): - Swift & Objective-C (iOS) - Java & Kotlin (Android) - React Native, Flutter Playing with AI and our reality: - ChatGPT, Copilot, Gemini - ARKit, ARCore - Object tracking - Object recognition Daily communication, weekly demos, Agile environment. Thanks for visiting my profile, I already like you, hope you feel the same!
    Featured Skill Bluetooth
    Alexa Skills Kit
    Internet of Things
    Front-End Development
    Web Development
    React Native
    Dart
    iOS
    Flutter
    Android App Development
    Mobile App Development
    iOS Development
    Android
    Kotlin
    Swift
    Objective-C
  • $20 hourly
    • 5.0/5
    • (13 jobs)
    Wide range of experience in firmware development for different embedded systems and MCUs: - STM32 series F0, F1, F4, G0: digital & analog environmental sensors, SD card, bootloaders, communication with GSM modules; - ESP32: LCD, touch controller, BLE hub for monitoring wireless sensors with proprietary protocol, customized websocket client, driver for industrial vent actuator controlled by WIFI; - CC2541: customized BLE environmental sensor with proprietary backend protocol. - NRF52: smart lock, communication with external sensors. Computer vision & video recognition: - tracking objects using color pattern detection; - finding parameters of electrical SMD components (as part of customer's concept). Additional knowledge: - protocols: SPI, I2C, USART, RS485; - Bluetooth low energy (BLE); - OpenCV.
    Featured Skill Bluetooth
    Firmware Programming
    OpenCV
    Core Bluetooth
    Bluetooth LE
    Computer Vision
    Embedded System
    ESP32
    STM32
    WiFi
    Microcontroller Programming
    nRF52
    C
    Embedded C
    C++
  • $30 hourly
    • 0.0/5
    • (0 jobs)
    👋 Hi! I’m Artem, a Senior iOS developer with 6+ years of experience building polished, scalable, and user-focused mobile apps in Swift (UIKit & SwiftUI). I specialize in: 📱 Native iOS development with strong UI/UX focus 💳 In-app subscriptions (RevenueCat, StoreKit) 📊 Analytics & attribution tools (Firebase, Appsflyer, Meta SDK) 🎯 A/B testing, onboarding funnels, retention optimization 🔗 Clean architecture & REST/GraphQL API integration My recent apps include fitness, health, and content delivery platforms — all built with attention to performance, tracking, and user engagement. I'm currently looking to build long-term Upwork relationships, and I’m open to $20–25/hr rates for my first few projects to prove my value. Let’s build something great together 🚀
    Featured Skill Bluetooth
    Push Notifications
    Socket Programming
    REST API
    Git
    Figma
    Firebase
    TestFlight
    Clean Architecture
    Multithreaded Programming
    UIKit
    SwiftUI
    Swift
    iOS Development
    Jira
  • $15 hourly
    • 0.0/5
    • (3 jobs)
    Hello everyone! My name is Oleg, and I’m a passionate mobile developer from Lviv, Ukraine, specializing in Flutter. With extensive experience in building high-performance, scalable, and user-friendly applications, I am always excited to bring ideas to life. Skills & Expertise: ✅ Backend: Core Data, Web Services (REST, SOAP, JSON, XML), SQLite, MongoDB, Firebase ✅ State Management: Provider, BloC ✅ UI/UX & Animations: Figma, Custom Animations ✅ 3rd Party Integrations: Facebook, LinkedIn, Google, Parse, Stripe, Braintree, Twilio, Instagram, Twitter, and other Social APIs ✅ Notifications: OneSignal, Push & Local Notifications ✅ Geolocation & Maps: Google Maps, Mapbox ✅ AI Integration: Working with AI APIs ✅ Scanning Features: QR Code Scanner, Barcode Scanner I’m always open to new challenges and exciting projects. Feel free to contact me—let’s build something great together!
    Featured Skill Bluetooth
    Mobile Payment Functionality
    Map Integration
    QR & Barcode Scanner
    Push Notifications
    User Authentication
    Firebase
    ChatGPT API Integration
    iOS
    Android
    Dart
    Flutter
  • $15 hourly
    • 0.0/5
    • (0 jobs)
    I am an experienced C/C++ developer with a strong background in automotive software, especially Linux-based projects. I have worked extensively with modern C++ as well as pure C, delivering high-performance and efficient code for a variety of industries. Key Skills & Expertise: • Automotive Software Development: In-depth experience working on automotive projects, ensuring compliance with ASPICE and industry standards. • Unreal Engine: Proficient in developing solutions using Unreal Engine, particularly in C++. • Linux: Expertise in developing software for Linux-based systems. • Code Optimization & Refactoring: Skilled in optimizing and refactoring existing code to improve performance and maintainability. • Unit & Component Testing: Proficient in writing unit and component tests to ensure high code quality and reliability. • Agile Methodologies: Experienced with SAFe and Agile practices, driving collaboration and ensuring timely delivery of high-quality software. I am passionate about writing clean, efficient, and scalable code, and I thrive in environments where process improvement and continuous learning are valued. Let's work together to bring your projects to life with top-notch solutions!
    Featured Skill Bluetooth
    Game Development
    Unreal Engine
    Bluetooth LE
    Can
    CAN Bus
    Python
    Automotive
    GitLab
    GitHub
    Git
    Component Testing
    Unit Testing
    C
    C++
  • $15 hourly
    • 0.0/5
    • (0 jobs)
    As an iOS developer with 4 years of experience, I help clients bring their ideas to life. Starting with architecture planning and ending with a successful release in the appstore and testfly for users. I provide expertise and solutions using my experience in mobile development as well as knowledge of the general practice of information technology. I have worked with a wide stack of iOS SDKs and have applied my knowledge in successful projects such as an application for employees of a company, an audio book, an online store, a messenger, educational applications. The world does not stand still, and even more so the computer world. I am constantly learning and developing direction of mobile development. I follow all the news and changes in the work with the IOS ecosystem. I like to complete complex tasks. For example, synchronizing thousands of notes and bookmarks between application and backend, or preloading content in the background.
    Featured Skill Bluetooth
    Realm Database
    Core Data
    WiFi
    Git
    Figma
    Websockets
    REST API
    RxSwift
    SwiftUI
    UIKit
    iOS Development
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