Hi 👋
I’m a full-stack developer with a strong backend and infrastructure focus, building production-ready systems: web applications, APIs, automation tools, secure network architectures, integrations, and internal platforms.

I work across the full lifecycle - from system design and software architecture to implementation, infrastructure deployment, security hardening, and long-term maintenance.

• C# / .NET: ASP.NET Core (Web API), Blazor, Razor Pages
• PHP: Laravel
• Python: Django
• Node.js: Express

Focus areas:

• API-first architecture
• complex business logic
• authentication & authorization
• background jobs and automation
• third-party integrations
• scalable SaaS systems
• security-first backend design

• TypeScript
• Svelte / SvelteKit
• HTML / CSS
• Tailwind CSS, Bootstrap

I treat frontend as system interface engineering: clear state, predictable data flow, performance, and minimal visual noise.

Windows

• Avalonia UI (AXAML)
• WPF (XAML)
• WinForms (including custom UI libraries)

macOS

• Swift (native applications)

• PostgreSQL
• Microsoft SQL Server
• MySQL
• SQLite
• MongoDB

Data access

• Dapper
• Entity Framework Core
• Django ORM
• Sequelize
• Mongoose
• LINQ to SQL

Experience includes:

• schema design
• migrations
• query optimization
• transactional workflows
• production debugging
• concurrency troubleshooting

• Linux / Ubuntu Server (VPS provisioning & hardening)
• Docker / Docker Compose
• Nginx
• systemd
• SSH
• Cloudflare (DNS, proxying, SSL, security layers)

Infrastructure & Networking

• VPS setup from scratch
• reverse proxy architecture
• SSL deployment
• GitHub Actions deployment pipelines
• production log diagnostics
• process management
• server hardening
• encrypted disk environments (LUKS)
• private networking
• WireGuard VPN deployment
• multi-hop secure tunneling
• remote access infrastructure (RustDesk / self-hosted systems)
• traffic isolation & routing design

CI/CD

• GitHub Actions
• Vercel
• Heroku

I regularly handle:

• deployment pipelines
• environment & secrets management
• infrastructure troubleshooting
• production recovery
• zero-downtime updates (when possible)
• server migration
• networking & routing configuration

• JWT / Refresh Tokens
• role-based access systems
• secure API architecture
• encrypted server storage
• VPN segmentation
• firewall strategy
• infrastructure access control
• operational security for distributed systems

• Telegram

  • bots
  • Telegram Web Apps
  • client-side flows and callbacks

• APIs

  • REST integrations
  • external services
  • internal microservices

• AI

  • OpenAI / Claude APIs
  • structured JSON workflows
  • prompt-driven pipelines
  • automation systems

• Crypto / Trading

  • Binance API
  • Coinbase API
  • sandbox / live environments
  • basic risk-control logic

• clean and scalable architecture
• infrastructure-aware development
• security-first systems thinking
• clear responsibility boundaries
• pragmatic approach to tech debt
• structured logging
• predictable release process
• documentation where it matters
• operational reliability over hype

• SaaS platforms
• admin systems
• internal business tools
• automation systems
• secure infrastructure
• custom APIs
• deployment pipelines
• networking architectures

• LinkedIn: Oleksii Chaikovskyi
• X: @incatswetrust_
• TG: @Itrustincats