Full-Stack IoT Developer | Embedded Systems | Hardware | CRM/ERP

I develop complete IoT solutions—from electronics and firmware to cloud infrastructure, CRM platforms, mobile applications, and production-ready products.

With over 12 years of experience in software and hardware development, I deliver reliable, scalable solutions for startups and established businesses.

I work under contract and can provide invoices for businesses.

My expertise

✅ Hardware Development

• PCB design

• Electronic circuit design

• Component selection

• Prototype development

• Manufacturing preparation

✅ Embedded & IoT

• ESP32

• Raspberry Pi

• STM32

• MQTT

• LoRaWAN

• Ethernet / Wi-Fi / GSM

• Sensors & actuator integration

✅ Backend & Cloud

• Python

• FastAPI

• Laravel

• PHP

• Docker

• Linux

• PostgreSQL

• MySQL

• Redis

• REST API

• WebSocket

✅ CRM / ERP Development

Custom systems for:

• device management

• remote monitoring

• billing

• analytics

• user management

• business automation

✅ Web & Mobile Applications

• React

• Responsive dashboards

• Customer portals

• Mobile apps for IoT devices

Industries

• Vending

• Self-service car wash

• Access control

• Parking systems

• Water vending machines

• Payment terminals

• FinTech

• Business automation

Recent Projects

• Barrier Gate Controller

• Self-Service Car Wash Controller

• Water Vending Controller

• Laundry Payment Controller

• IoT Device Management Platform

• CRM for Device Monitoring

• QR Payment Platform

• Fiscalization & Payment Gateway Integrations

End-to-End Development

If your project requires specialists from different fields, I coordinate a trusted team of developers, designers, and engineers to deliver the entire solution from concept to production.

Portfolio

https://shershnyov.dev/

https://naglyad.pro/

https://npc.com.ua/

https://naglyad.com/

https://naglyad.shop/

https://sklyar.te.ua/

https://sklyar.store/

Tech Stack

Python • FastAPI • ESP32 • Raspberry Pi • STM32 • React • Laravel • PHP • Docker • Linux • PostgreSQL • MySQL • Redis • MQTT • REST API • WebSocket • PCB Design • Embedded Systems • IoT • CRM • ERP