Hire the Best C# Developers & Programmers
in Ukraine

Clients rate our C# developers & Programmers
Rating is 4.8 out of 5.
4.8/5
Based on 973 client reviews
Irina Z.

Kharkov, Ukraine

$50/hr
5.0
5 jobs

I am an Experienced financial markets software developer specializing in asset-agnostic, multi-user trading systems and algorithmic trading platforms. -C++ (17/20), C#, Python for ultra-low-latency trading infrastructure -Sub-microsecond execution paths, lock-free/zero-copy pipelines, custom allocators, CPU pinning, async I/O -FIX 4.x/5.x, FIX-FAST, ITCH/OUCH, CME iLink 2.0, CME MDP 3.0 — full protocol implementation & certification -High-speed market data processing: multicast UDP, depth aggregation, order-book reconstruction -Cross-venue arbitrage, market making, synthetic orderbooks, fast cancel/replace loops, burst execution -Execution & connectivity: PrimeXM, LMAX, IBKR (TWS & FIX), TT, FX/CFD brokers, Binance/Bybit/OKX/Coinbase, custom FIX hubs -Market data (for backtesting/analytics, not execution): Databento, Polygon, dxFeed, Alpaca, SIAC/OPRA -Crypto infrastructure: latency-optimized WS/REST clients + Uniswap V2/V3 & 1inch smart-contract execution -MT4/MT5 server-side engineering: A/B-book routing, LP aggregation, dealer logic, bridge development -Trading platforms: MetaTrader 4/5, TradingView (Pine Script), Trading Technologies (TT), QuantConnect, Interactive Brokers TWS, Polymarket, HummingBot.

  • C#
  • MQL 5
  • MQL 4
  • Trading Language
  • Cryptocurrency Trading
  • Python
  • Trading Strategy
  • cTrader
  • MetaTrader
  • MetaTrader 4
  • MetaTrader 5
  • NinjaTrader
  • Forex Trading
  • FinTech
  • Financial Software
Andrii G.

Kiev, Ukraine

$55/hr
4.9
73 jobs

Linux developer: from kernel drivers till own browsers, firmwares and linux distros! Creating software for people. github: repu1sion

  • C++
  • Embedded Linux
  • C
  • Python
  • Firmware
  • Kernel
  • Linux
  • Linux System Administration
  • OpenWrt
  • Driver Development
  • Bash
  • Scripts & Utilities
Roman O.

Zhitomir, Ukraine

$55/hr
5.0
29 jobs

Send your architecture for a free code review! I’m a Senior Full Stack Developer & Software Architect with 20+ years in custom software development. I use modern engineering strategies to build high-performance, enterprise-grade platforms. 🎯 What I bring to your brand as a Senior Full Stack Developer: ✔️ Over 20 years of commercial software engineering experience, leading .NET framework, C# development, and Node.js architectures for global enterprises. ✔️ Results-focused Full Stack Development: As a .NET Expert, I create scalable microservices architectures and API development plans that boost performance and handle high user concurrency. As a Software Architect, I ensure your custom software development is always ROI-driven and infinitely scalable. ✔️ Technical & Architecture Audit Mastery: As a Senior Full Stack Developer, I develop a detailed code audit, database audit, and technical architecture audit to map out your system structure. My cloud infrastructure expertise allows me to refine backend systems before scaling. I’ve delivered 150+ architecture audits and system performance reports, helping streamline software development workflows. ✔️ API Integration & Webhooks Expertise: As an API Specialist and backend developer, I prioritize REST APIs, GraphQL, and third-party integrations. My approach as a Software Architect focuses on secure authentication, OAuth2, and custom API architecture. ✔️ Frontend & Modern UI Solutions: As a Senior Full Stack Developer, I use React.js development and Vue.js optimization for high-performing user interfaces. As a .NET Expert, I handle Angular setups, UI component architecture, and frontend-to-backend integration to ensure your web application performs flawlessly. ✔️ Cloud Deployment & CI/CD Innovation: As an Azure developer and DevOps consultant, I use Docker containerization, Azure App Services, and Azure Functions to scale deployments. ✔️ Database & Performance Optimization: I am a database specialist and SQL Server developer. My technical data skills include PostgreSQL optimization, Entity Framework, and complex SQL queries. As a Software Architect, I ensure your database design is flawless using the best indexing and scaling strategies. ✔️ AI Integrations & Tooling: As an AI integration developer, I build C# and Python solutions for AI-driven services. My expertise includes pragmatic implementation of LLM APIs, OpenAI/Claude integrations, and utilizing the Model Context Protocol (MCP) to securely connect AI agents with backend systems and custom data sources without unnecessary over-engineering. 📊 My Achievements in Numbers: 🔶 Software Architect for a Global Enterprise (SaaS / B2B): ▪️ Improved API response times by 200% through technical code audit and query optimization. ▪️ Reduced cloud infrastructure costs by 50% via enhanced microservices architecture and Docker deployment. ▪️ Accelerated feature delivery by 30% using automated CI/CD pipelines and agile workflows. 🔶 Senior Full Stack Developer for a FinTech Platform: ▪️ Achieved 99.99% uptime through .NET migration and Node.js backend optimization. ▪️ Reduced database deadlocks by 100% with a technical database audit and SQL Server optimization. 🔶 API Specialist for an E-commerce Engine: ▪️ 2x checkout speed by redesigning the REST API and payment gateway integration (Stripe). ▪️ 3x faster user onboarding through architecture audit insights and Auth0 security implementation. Why should you hire me as your Senior Full Stack Developer and Software Architect? ▪️ 20+ years in software engineering, backend architecture, API development, and cloud infrastructure. ▪️ Senior Full Stack Developer in React.js, Vue.js, Angular, and modern JavaScript. ▪️ .NET Expert in C#, ASP.NET MVC, Web API, and .NET. ▪️ Delivered enterprise backend services and microservices architectures for B2B and SaaS platforms. ▪️ Node.js Specialist support for high-concurrency event-driven applications. ▪️ Database architecture specialist for SQL Server, PostgreSQL, and MySQL growth. ▪️ Expert in Azure DevOps, Docker containerization, and CI/CD pipelines. ▪️ Practical experience in AI integrations, delivering C# and Python solutions for AI-driven services, including LLMs and MCP. ▪️ Software Architect and CTO with a proven track record of zero-downtime, secure deployments. Specialized Development Services: 🔹 Architecture Audit: From database performance audit to technical code audit. 🔹 API Integration: From third-party API integrations to custom REST/GraphQL APIs. 🔹 Backend Development: From Node.js microservices to .NET Core enterprise systems. 🔹 Frontend & UI: React.js and Vue.js scalable applications. 🔹 Cloud & DevOps: Optimization for Azure App Services, Docker, and GitHub Actions. 🔹 AI Integrations: solutions for AI-driven services, LLM API endpoints, and MCP (Model Context Protocol) implementation. Looking for an experienced Senior Full Stack Developer and Software Architect? Let’s connect!

  • C#
  • .NET Framework
  • .NET Core
  • SQL
  • Node.js
  • API Integration
  • ASP.NET
  • Entity Framework
  • JavaScript
  • React
  • PostgreSQL
  • Umbraco
  • RESTful API
  • Web API
  • Angular
Mykhailo K.

Kyiv, Ukraine

$50/hr
4.9
61 jobs

Hello and welcome! I’m Mike — a professional algorithmic trading developer with 10+ years of coding experience in MQL4/MQL5 and 20+ years of real Forex trading experience. I help traders, investors, and fintech companies turn trading ideas into profitable, reliable, and fully automated systems. My core advantage is simple: I’m not just a programmer — I’m an experienced trader who understands markets, strategy logic, execution risks, and real-world trading behavior. That means I build tools that are practical, efficient, and designed for live trading conditions. ━━━━━━━━━━━━━━━ WHAT I CAN BUILD ━━━━━━━━━━━━━━━ ✔ Expert Advisors (EAs) for MetaTrader 4 / MetaTrader 5 ✔ Custom Indicators ✔ Trade Panels / Dashboard Interfaces ✔ Strategy Automation ✔ Signal Systems ✔ Risk Management Tools ✔ Backtesting & Optimization Systems ✔ TradingView Indicators & Strategies (Pine Script) ✔ Python Trading Utilities / Data Tools ✔ Existing Code Fixes / Upgrades / Refactoring ✔ API Integrations / External Services ━━━━━━━━━━━━━━━ WHY CLIENTS HIRE ME ━━━━━━━━━━━━━━━ ✔ 1000+ completed projects for clients worldwide ✔ Strong trading knowledge + strong programming skills ✔ Clean, structured, maintainable code ✔ Fast communication ✔ Honest deadlines ✔ Long-term support after delivery ✔ Ability to understand strategy ideas quickly ━━━━━━━━━━━━━━━ TECH STACK ━━━━━━━━━━━━━━━ MQL4, MQL5, Pine Script, Python, C++, JavaScript, PHP, HTML/CSS, REST APIs Platforms: MetaTrader 4, MetaTrader 5, TradingView ━━━━━━━━━━━━━━━ WHO I WORK WITH ━━━━━━━━━━━━━━━ • Retail traders • Funded traders • Signal providers • Trading educators • Prop firms • Fintech startups ━━━━━━━━━━━━━━━ LET’S WORK ━━━━━━━━━━━━━━━ If you need a serious developer who understands both coding and trading — send me a message. I’ll review your idea, suggest the best implementation path, and help turn it into a professional product.

  • C++
  • PHP
  • JavaScript
  • MQL 5
  • CSS 3
  • HTML5
  • MetaTrader 4
  • MetaTrader 5
  • Selenium
  • MQL 4
  • Forex Trading
Dmytro D.

Khmelnytskyi, Ukraine

$30/hr
4.8
212 jobs

I am a Full Stack top rated developer. With more than 10 years of experience. Great products move the world forward. With AI, we can turn your vision into a working app—faster. Message me and let’s talk. And a little bit of​ technical info about me (don't forget to ask if you are looking for something specific): - Swift & Objective-C (iOS) - Java & Kotlin (Android) - React Native, Flutter AI development: - ChatGPT, Copilot, Gemini, Claude AI agentic: - OpenClaw - Claude Code - n8n Daily communication, weekly demos, Agile environment. Thanks for visiting my profile, I already like you, hope you feel the same!

  • iOS Development
  • Mobile App Development
  • Flutter
  • React Native
  • Web Development
  • Front-End Development
  • AI Development
  • Generative AI
  • ChatGPT API
  • AI Implementation
  • Full-Stack Development
  • AI Agent Development
  • AI Builder
  • n8n
Pavlo K.

Hrebinka, Ukraine

$30/hr
4.8
61 jobs

Senior Unity Engineer (10+ years) shipping games and interactive apps across mobile, PC, and WebGL. I thrive on complex problems and have a keen eye for detail—whether that’s refactoring tangled codebases into clean architectures, removing performance bottlenecks, or integrating production features like MediaPipe and LLM APIs. Recent work: • Mosquito Coast — multi-screen interactive framework (patented; 5-year engagement) • Ablizmo / “OVERLODE” — real-time RTS/deck-building UI overhaul + systems work • Atomic Starman — narrative tooling pipeline (Articy + Dialogue System) • Earlier: WebGL 3D medical visualization, mobile simulation apps, gameplay systems & bug fixing What I do best: 🧩 Gameplay / UI Systems • Modular C# systems, state machines, event-driven architecture • UI architecture (MVC/MVVM), responsive UX, tooltips, menus, data-driven UI 🚀 Performance & Stability • Profiling CPU/GPU, reducing GC/memory spikes, smoothing frame time • Pragmatic refactoring that improves stability without risky rewrites 🛠 Architecture, Refactoring & Tools • Turning large/legacy code into maintainable modules • Editor tools + workflow improvements to speed up teams 🤖 AI / LLM Integrations (when useful) • Integrating APIs (OpenAI/Claude), prompt + data flow design, guardrails • I also use modern coding assistants to speed up delivery while keeping code production-ready How I work: I’m MVP-first: identify the highest-impact tasks, prototype quickly to de-risk, then build scalable solutions. I’m comfortable in distributed teams, communicate directly, and I’m not afraid to dive deep into debugging. What I’m looking for: • Gameplay programming, UI & systems development • Optimization, stabilization, refactoring legacy projects • Mobile & WebGL projects • Internal tools development • AI-assisted features, AR prototypes If you want a senior Unity developer who can ship fast, improve code quality, and make your project stable and scalable — I’d love to help.

  • C#
  • Unity
  • Game Development
  • Python
  • Machine Learning
  • pandas
  • Python Scikit-Learn
  • Flask
  • Web Scraping
  • .NET Framework
  • WebGL
  • Microsoft Excel
  • SQL
  • Tableau
  • ASP.NET Core

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