I build Android dedicated-device solutions: custom Launchers, Kiosk Mode applications, BLE-connected hardware systems, and enterprise Android experiences.
With hands-on experience delivering production Android applications for businesses, I help companies transform standard Android devices into reliable, purpose-built products.
My expertise focuses on Android systems that go beyond traditional mobile apps, including:
• Custom Android Launchers
• Kiosk Mode & Lock Task Mode
• Enterprise & Dedicated Devices
• BLE (Bluetooth Low Energy) Integration
• ESP32-Based IoT Systems
• Hardware Communication & Device Control
• Device Provisioning & Management
• Real-Time Android Applications
Over the years, I have built Android solutions that communicate directly with hardware devices, control embedded systems, and provide streamlined user experiences for dedicated-use environments.
Recent projects include:
✔ Custom Android Launchers
* Built launcher experiences tailored for specific business workflows
* App restrictions and dedicated-device experiences
* Productivity-focused launcher designs
✔ Android Kiosk Solutions
* Lock Task Mode implementation
* Single-purpose device workflows
* Enterprise tablet deployments
✔ BLE & Embedded Device Integration
* Android applications communicating with ESP32 devices
* Custom BLE GATT services
* Real-time device control and monitoring
* JSON-based communication protocols
✔ Hardware-Connected Android Applications
* Sensor integrations
* LED controller systems
* Industrial and IoT device communication
I am particularly interested in projects involving:
• Android Launchers
• Kiosk Mode Applications
• Dedicated Devices
• BLE Communication
• ESP32 Integration
• Enterprise Android Solutions
• Device Management Workflows
• IoT Connected Products
Technical Stack:
• Kotlin
• Jetpack Compose
• MVVM Architecture
• Coroutines & Flow
• BLE (Bluetooth Low Energy)
• Android Kiosk Mode
• Custom Android Launchers
• ESP32 Development
• REST APIs
• Material Design
If you're building an Android device experience rather than just another Android app, I'd be happy to discuss your project.
Software
Fiddler
Node.js
React
Vue.js
Java
J2EE
Android App
React Native
libGDX
Kishore B.
Bengaluru, India
$50/hr
5.0
11 jobs
Databases: ORACLE 9i, PL SQL, Sybase, SQL SERVER 2000.
Tools : Rational Software Architect 7.x, Eclipse 2.x and 3.x
Has Architected Message flow in Large-Scale enterprise environments like Kafka Zookeeper based Topics and partition streams for RFID
Implemented a medical image archive service using DICOM standard as a cloud computing based solution based on Microsoft Windows Azure as capstone project.
Solid experience in DevOps, Dockers, SWARMS , Ubuntu and Linux
Solid experience in HLS, DASH, SetupBox, radius, AAAA, 802.11, wireless technologies
Working knowledge of L2 and L3 protocols , Data Structures, Ethernet and IXIA traffic generators.
Solid experience in C++, MFC, Java , C#, Dot net 3.5/4.0/4.5, LINQ, Rest, WCF , WPF, MVC and MVVP
Perl, Python, Flask, Selenium , HTTP, SOAP, TLS/SSL, IE Plugins(BHO), Cloud testing
Good Knowledge in Databases, PL SQL, SQL Server, MongoDB and Oracle.
Good Knowledge in SSL/TLS Implementations, RabbitMQ, Apache Kafka, ActiveMQ, Web Sockets, Signal R, Client/Server Security Certificate Management and Auto Configuration Servers(ACS).
Exposure on industry standards such as DICOM, HL7, HIPAA and CCOW.
Good Knowledge in Medical, Security Systems domains & MAPI.
Oracle Enterprise Service Bus
Software
Fiddler
C#
iOS
Java
C++
Al F.
Khulna, Bangladesh
$20/hr
5.0
6 jobs
Hi, I'm Al Fahad — a passionate Full Stack Developer with over 5 years of hands-on experience in mobile app development, cross-platform architecture, and smart software systems. I come from an engineering background, currently pursuing my BSc in Electronics and Communication Engineering at KUET, and I’ve turned my love for coding, electronics, and design into a full-time professional journey.
🧰🧰 You can directly check my portfolio items, they are all real life projects and the reviews of all the works are also attached with them. All the people were very satisfied. Take a look without a delay.
During the pandemic, I dived deep into Data Structures and Algorithms, building a strong foundation in core computer science concepts and problem solving. Since then, I've worked on countless personal projects to sharpen my skills, then moved on to freelance platforms where I delivered quality solutions and earned great client reviews.
⚙️ What I Do
I specialize in cross-platform development across mobile, web, and desktop — ensuring smooth, high-performance user experiences, scalable backends, and efficient system automation. Whether it's a business app, a startup prototype, or an embedded IoT system — I bring both technical depth and creative thinking to the table.
🧠 My Core Skills
🔹 Mobile & Frontend Development:
Flutter, React Native, Jetpack Compose
Win32 API, .NET, Custom UI systems
🔹 Backend Development:
Node.js, Django, Flask
Firebase, REST APIs, Websockets
🔹 System & Automation:
Linux system administration (Ubuntu, Debian)
Advanced scripting and automation in Python
Bash scripting, DevOps fundamentals, Docker
🔹 UI/UX & Design:
Figma, Penpot, Adobe Illustrator, Photoshop
Clean, modern, and responsive interface design
🔹 IoT & Embedded Systems:
Arduino, Raspberry Pi, ESP32
Microcontroller programming, sensor integration
🔹 Others:
WordPress site development
Web scraping, task automation, OpenWRT router customizations
🧰 Notable Projects
✅ Flutter based Event Management app with advanced UI/UX and API integrations
✅ Cross-platform Location Tracking app using React Native + Node.js + Firebase full stack
✅ Automation script in Python for scraping and data processing
✅ OpenWRT-based custom router system testbed development
✅ Branding and logo design for a martial arts company
🌟 Why Work With Me?
✅ Deep Technical Knowledge: I don't just "make it work" — I understand the how and why behind the code.
✅ Full Stack Confidence: I can build your entire system from frontend to backend to deployment.
✅ Passionate and Self-Motivated: I truly love what I do, and it shows in my work and dedication.
✅ Great Communication & Freelance Experience: You’ll find me reliable, easy to collaborate with, and open to feedback.
✅ Try Before You Hire: I’m confident in my skills — feel free to send a small task to test me before committing.
🎯 Let’s Build Something Great
If you're looking for a reliable full stack engineer who can confidently deliver across mobile, web, desktop, and IoT — you’re in the right place. I’m open to both short- and long-term projects, and always excited to bring new ideas to life.
Feel free to reach out — I’d love to learn about your project and see how I can help!
Front-End Development
Web Development
Full-Stack Development
Back-End Development
Mobile App Development
Desktop Application
Database
Flutter
React Native
Android App
NodeJS Framework
Arduino
Embedded System
Altium Designer
Embedded C
STM32
ESP32
Circuit Design
Python
Kotlin
Kamil S.
Swiecie, Poland
$70/hr
5.0
1 jobs
Hi , With 8+ years of experience in VoIP engineering and telecom infrastructure, I help businesses build, customize, and scale reliable call center and communication platforms ranging from small business deployments to carrier-grade environments.
I specialize in designing high-performance VoIP systems, advanced dialer solutions, telecom billing platforms, and cloud-based communication infrastructures that are secure, scalable, and cost-effective.
⭐️ What I Can Help You With
1. VoIP & PBX Solutions
- Asterisk, FreePBX, FreeSWITCH, Elastix, Issabel, FusionPBX
- 3CX, PBXware, VoIPOffice
- SIP Trunking & Carrier Integrations
- Multi-server VoIP architecture
- High Availability (HA), clustering, failover, and load balancing
- Security hardening and system optimization
2. VICIDial & Call Center Development
- Complete Inbound, Outbound, and Blended Call Center Setup
- VICIDial installation, customization, and troubleshooting
- Custom campaign logic and workflow development
- Agent interface redesign and UI/UX enhancements
- Custom reports and dashboards
- VICIBox multi-server clustering
- Voice broadcasting and predictive dialing solutions
3. Asterisk Development
- Advanced dialplan design
- AGI scripting and custom applications
- IVR development and automation
- Call routing optimization
- Conference solutions and WebRTC integrations
- Custom webphone development
4. CRM & API Integrations
- Twilio, Telnyx, SignalWire, Bandwidth, Plivo, VoIP.ms
- CRM integrations and lead management systems
- REST API development and automation
- Webhook and real-time data synchronization
- Third-party call transfer solutions
- TrackDrive and custom lead posting integrations
5. Telecom Billing Platforms
- A2Billing
- ASTPP
- VOS3000
- Magnus Billing
⭐️Services include:
- Billing customization
- CDR processing
- Multi-tenant deployments
- Reseller management systems
- Callback and IVR customization
1. AI Voice Agents & Automation
- ElevenLabs
- Vapi
- AI-powered voice assistants
- Conversational AI integrations
- Voice workflow automation
2. SMS Solutions
- Bulk SMS platforms
- SMS broadcasting systems
- Two-way SMS applications
- CSV-based bulk messaging portals
- Twilio, Telnyx, SignalWire, Bandwidth, and VoIP.ms integrations
⭐️ Supported VoIP Providers
Extensive experience integrating with major telecom carriers and providers, including:
Twilio, Telnyx, SignalWire, VoIP.ms, Bandwidth, Flowroute, RingCentral, Nextiva, Plivo, Anveo, DIDLogic, IDT Express, SIP.US, Vitelity, Voxbeam, Telus, Nexmo, QuestBlue, Switch2VoIP, and many others.
⭐️ Why Clients Hire Me
✔️ 9+ Years of Specialized VoIP Experience
✔️ Deep Asterisk & VICIDial Source-Code Expertise
✔️ Carrier-Grade Deployments & Multi-Server Architectures
✔️ Strong API Integration & Automation Skills
✔️ Fast Troubleshooting & Performance Optimization
✔️ Reliable Communication & Long-Term Support
Whether you need a new VoIP deployment, VICIDial customization, telecom billing platform, AI voice integration, or a complete call center solution, I can deliver a stable, scalable, and production-ready system tailored to your business needs.
Le'ts have a chat !
Asterisk
FreePBX
VoIP Administration
System Administration
Linux
Linux System Administration
FreeSWITCH
A2Billing
Kamailio
SSH
TCP/IP
VoIP PBX
VoIP
MikroTik RouterOS
Muhammad Umair K.
Dera Ismail Khan, Pakistan
$3/hr
5.0
7 jobs
I am an expert in SystemVerilog, Verilog, and VHDL with over 5 years of experience in FPGA and IPS verification using Cocotb and UVM. For IPS verification, I primarily use the Cocotb and UVM libraries.
Some highlights of my experience include:
1. Working with simulators such as Xilinx Vivado, Cadence, Synopsys, Icarus, and Verilator.
Assisting with digital system design projects, including building data paths and control units using Verilog.
2. Extensive experience with microprocessor projects; if you’re looking for an expert in this area, I can help.
3. Proficiency in assembly coding on the Edsim51 simulator using 8051 assembly language.
4. Strong command of C and C++ for related projects.
5. "I am skilled in RISC-V processor design and implementation on FPGA boards. I have expertise in developing, configuring, and deploying RISC-V architectures, enabling efficient and customized processor solutions on FPGA hardware."
Verilog
SystemVerilog
FPGA
Arduino IDE
C
C++
Assembly Language
Analog Circuit
Algorithms
Process Design
Simulink
Simulation Software
Electronic Design
KiCad
Altium Designer
Jay Sam Nuel H.
Tagbilaran City, Philippines
$40/hr
5.0
14 jobs
I have experience in the following languages/frameworks:
Android, Swift, WPF, C, C++, C#, VB.Net, Java, Bash/Batch Scripting, MySQL, PHP, Javascript and HTML.
Laravel, Vue.js, React Native
With experience in coding in Linux Environment and Windows Environment.
I have basic knowledge in Wordpress, Bootstrap, CI Framework and Laravel Framework.
My first job after i graduated last 2010 is on a company who creates web base ERP systems with inventory, accounting, warehouse management, sales, purchase and industry process modules. We use HTML , JSON, Javascript, MySQL and QCGI ( company owned framework ).
I also worked in the company who's products are POS, ATM and other Self Service Products. I am one of the software engineers who fixes found bugs and implement new features in an existing application.
I also worked on an outsourcing company as a software developer. I'm assigned on android rom customization and various desktop app. I created desktop prototype application like OS Recovery System, Camera Barcode Reader and Camera Face Detection using various libraries and dlls. I helped on various web programming tasks and some mobile programming. I have also experience in creating OPOS/JPOS driver and application.
I am fast learner and have better ideas to share. I'm flexible in the environment, enthusiastic and can work in a fast phase environment. What makes me unique? Is that I have experience, skills and knowledge to share.
Desktop Application
Web Development
Mobile App Development
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