You will get Web App Development | Full Stack Developer | Mobile App Developer
Top Rated
Project details
Custom web app development:
✅ Apps with user authentication, user profile creation & management, user roles
✅ Marketplaces
✅Mobile App Development
✅ Payment systems integration (Stripe, PayPal)
✅ Maps and geolocation (Google Maps API, Mapbox API)
✅ Dashboards for mobile app development
✅ Admin dashboards
As full stack developer I offer web app design & development services:
🔹 Wireframing & prototyping
🔹 UI/UX design
🔹 Frontend development (React, JavaScript, TypeScript, HTML, CSS)
🔹 Backend development (Node.js, Next.js, Nest.js, Python
🔹 Integration with REST APIs and third-party services
🔹 Responsive design and cross-browser compatibility
🔹 QA, testing, debugging
🔹 Maintenance and support
Deliverables:
• Single Page Applications (SPA)
• Landing page
• Websites
• Web applications
• Progressive Web Apps (PWA)
• SaaS
• Analytical dashboards and reporting tools
• Prototypes & Wireframes
• Post-Launch Maintenance & Updates
✅ Apps with user authentication, user profile creation & management, user roles
✅ Marketplaces
✅Mobile App Development
✅ Payment systems integration (Stripe, PayPal)
✅ Maps and geolocation (Google Maps API, Mapbox API)
✅ Dashboards for mobile app development
✅ Admin dashboards
As full stack developer I offer web app design & development services:
🔹 Wireframing & prototyping
🔹 UI/UX design
🔹 Frontend development (React, JavaScript, TypeScript, HTML, CSS)
🔹 Backend development (Node.js, Next.js, Nest.js, Python
🔹 Integration with REST APIs and third-party services
🔹 Responsive design and cross-browser compatibility
🔹 QA, testing, debugging
🔹 Maintenance and support
Deliverables:
• Single Page Applications (SPA)
• Landing page
• Websites
• Web applications
• Progressive Web Apps (PWA)
• SaaS
• Analytical dashboards and reporting tools
• Prototypes & Wireframes
• Post-Launch Maintenance & Updates
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$10,000
|
Standard
$15,000
|
Advanced
$20,000
|
|---|---|---|---|
| Delivery Time | 30 days | 50 days | 70 days |
Number of Revisions | 0 | 3 | 5 |
Number of Pages | 3 | 5 | 10 |
Design Customization | - | ||
Content Upload | - | - | |
Responsive Design | - | - | |
Source Code |
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JO
Jullian O.
Jul 17, 2026
Website Development for Connection App - Signal One
World Class Developer, that constantly over performs!
We will definitely continue leaning on Serge’s App and Web development expertise.
We will definitely continue leaning on Serge’s App and Web development expertise.
SC
Stanfield C.
Jun 2, 2026
BLE Mobile App Memory Page Size Update
DG
Derek G.
Apr 6, 2026
Mobile App Developer PM
Working with Serhiii was great and he always made sure to provide fast turnaround on requests.
BF
Brett F.
Nov 18, 2025
Marketplace Mobile App Flutter
SC
Stanfield C.
Sep 24, 2025
Progressive Automations App V2
We have gone to Otrofy for several projects now and the consistency and level of work that they provide have been excellent. I would highly recommend them.
About Serhii
Senior Mobile Developer | Mobile App Development | Long-Term | IoT
100%
Job Success
Toronto, Canada - 1:28 pm local time
🔧 𝐖𝐡𝐚𝐭 𝐈 𝐃𝐨
- Mobile Apps (iOS + Android): 40+ apps delivered. 25+ published to the App Store (⭐ 4.7 avg). Performance optimized, CI/CD deployed, built to scale.
- IoT & BLE: Deep expertise with ESP32, custom firmware, Bluetooth, and AWS IoT. Smart devices, real-time sync, low-latency control.
- AI/ML Integration: ChatGPT, ML models, and automation embedded into mobile/web apps. 5+ AI chatbots, 4 ML features built.
- Web Backend + Frontend: Full-stack engineer using Node.js, React, Laravel, MySQL. Solid APIs, fast UIs, maintainable code.
📱 𝐑𝐞𝐜𝐞𝐧𝐭 𝐖𝐨𝐫𝐤
- BLE-based TV Lift Controller: IoT app + firmware. 99.9% uptime. Reduced support tickets by 85%.
- Fitness Social Platform (Flutter): Scaled to 50K+ users. 40% MoM growth.
- QSR Ops Platform: Internal tool for 200+ fast food locations (Taco Bell, KFC, etc). Saved $1.2M/yr in ops cost.
- Sports Team App: Booking, scheduling, payments. Now used by 15K+ hockey players.
🧰 𝐒𝐭𝐚𝐜𝐤
Mobile: Flutter, Dart, React Native, Swift
Web: React.js, Node.js, Laravel
IoT: BLE, ESP32, Arduino, AWS IoT
AI: Python, OpenAI API, TensorFlow
DevOps: CI/CD, GitHub Actions, Docker
Tools: Figma, Postman, Firebase, MySQL
✅ 𝐖𝐡𝐲 𝐌𝐞?
- Built MVPs and scaled platforms — not just code, real products
- Own the process — architecture to deployment
- Communicate clearly
- Proactive
- Detail-oriented
Steps for completing your project
After purchasing the project, send requirements so Serhii can start the project.
Delivery time starts when Serhii receives requirements from you.
Serhii works on your project following the steps below.
Revisions may occur after the delivery date.
Steps of Web App Development
Discovery & requirements gathering UI/UX Design: wireframes, user flow, responsive UI Development: Build the frontend and backend Testing: Identify and fix bugs Deployment: Launch the web app Maintenance: Provide ongoing support