Denys
C.

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Website

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Skills

Web, Mobile & Software Dev

IT & Networking

Javascript

React

API Integration Specialist

Specialization

Backend & Full Stack Developer | FastAPI | React | Telegram Mini Apps | PostgreSQL

Hourly rate

$35/hr

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About me

Backend & Full Stack Software Engineer focused on building production-ready applications, business platforms, SaaS systems, Telegram Mini Apps, REST APIs and custom automation solutions. I develop scalable software with clean architecture, secure authentication, database design, third-party API integrations and modern web technologies. What I can build • SaaS Platforms • Business Automation Systems • CRM / ERP Solutions • Telegram Bots & Mini Apps • REST API Development • Admin Dashboards • Backend Services • Full Stack Web Applications • AI Integrations • Payment Systems • Web Scraping & Data Processing • PostgreSQL & SQL Database Design • Docker Deployment & Linux Server Setup I work with modern technologies including Python, FastAPI, React, TypeScript, PostgreSQL, SQLAlchemy, Docker, Redis, Celery, JWT Authentication and API integrations. My focus is writing clean, maintainable and scalable code that solves real business problems. I am available for both short-term projects and

Work experience

Self-employed

September 2022 – Current time

Job title

Backend & Full Stack Software Engineer

Work experience & achievements

Design and development of production-ready backend systems, SaaS platforms, Telegram Mini Apps, REST APIs and custom business software. Building secure authentication systems, scalable architectures, API integrations, automation tools, payment systems and modern web applications using FastAPI, React, PostgreSQL, Docker and cloud technologies. Focused on clean architecture, performance, maintainability and long-term business solutions.

Education

Not specified

SaaS Subscription Platform API

Production-ready SaaS backend platform built with FastAPI. Features include secure JWT authentication, organizations, subscription billing, API keys, payments, webhooks, audit logs, RBAC, Redis, Celery, APScheduler and Docker. Designed with clean architecture, scalability and enterprise-level security in mind. Tech Stack: • FastAPI • SQLAlchemy 2 • PostgreSQL • Redis • Docker • Celery • JWT • Alembic GitHub: https://github.com/denys-dev-git/fastapi-saas-platform

Telegram Mini App Business Platform

Production-ready Telegram Mini App built for modern e-commerce businesses. This platform provides a complete shopping experience inside Telegram, including secure authentication, product catalog, shopping cart, checkout, order management, promotions, favorites, notifications and a powerful admin dashboard. Designed with a modern mobile-first interface, smooth animations and enterprise-level architecture to deliver high performance, scalability and excellent user experience. Features: • Telegram Authentication • Product Catalog & Categories • Shopping Cart & Checkout • Order History • Favorites & Promotions • Admin Dashboard • Analytics & Reports • CSV / JSON Export • JWT Authentication • Responsive UI Tech Stack: • FastAPI • React 19 • TypeScript • TailwindCSS • PostgreSQL • SQLAlchemy • Docker • JWT GitHub: https://github.com/denys-dev-git/telegram-miniapp-business-platform

Project Management Platform API

Enterprise-grade backend platform for project and team management built with FastAPI. Designed for companies managing multiple organizations, projects and development teams. The platform provides secure authentication, Kanban workflows, task management, team collaboration, notifications, analytics and role-based permissions. Built with scalability, clean architecture and security in mind, making it suitable for startups and enterprise environments. Features: • Organizations & Workspaces • Projects & Kanban Boards • Task Management • Comments & Attachments • Team Collaboration • Notifications • Analytics Dashboard • CSV / JSON / Excel Export • JWT Authentication • RBAC Permissions Tech Stack: • FastAPI • PostgreSQL • Redis • Celery • APScheduler • SQLAlchemy • Docker • JWT GitHub: https://github.com/denys-dev-git/fastapi-project-management-platform

Business Automation Platform API

Production-ready automation platform for building and managing business workflows. The platform allows organizations to create automated jobs, schedule executions, connect external services through API integrations, monitor workflow execution and analyze performance using detailed logs and dashboards. Designed for companies looking to automate repetitive business processes with enterprise-level security, scalability and reliability. Features: • Workflow Automation • Scheduled Jobs • API Integrations • Background Processing • Execution History • Analytics Dashboard • API Keys • Role-Based Access Control • CSV / JSON / Excel Export • JWT Authentication Tech Stack: • FastAPI • PostgreSQL • Redis • APScheduler • Celery • SQLAlchemy • Docker • JWT GitHub: https://github.com/denys-dev-git/fastapi-automation-platform

Telegram Shop Bot

Production-ready Telegram e-commerce solution built with Python and Aiogram. The bot provides a complete online shopping experience inside Telegram, allowing businesses to sell products without a website. Customers can browse catalogs, manage shopping carts, place orders and receive notifications, while administrators control products, categories, orders and analytics through a powerful management panel. Designed with clean architecture, scalability and automation in mind, making it suitable for real businesses and online stores. Features: • Product Catalog • Categories • Shopping Cart • Order Management • Admin Dashboard • Broadcast Messages • Analytics • CSV / JSON Export • User Management • Docker Deployment Tech Stack: • Python • Aiogram 3 • SQLite • Docker • asyncio GitHub: https://github.com/denys-dev-git/telegram-shop-bot

DenysC.

Work experience

Education

SaaS Subscription Platform API

Telegram Mini App Business Platform

Project Management Platform API

Business Automation Platform API

Telegram Shop Bot

Denys
C.