Hire the Best C# Developers & Programmers
in Poland

Clients rate our C# developers & Programmers
Rating is 4.8 out of 5.
4.8/5
Based on 151 client reviews
Piotr G.

Elblag, Poland

$42/hr
5.0
5 jobs

I'm an Unreal Engine (4 & 5) Blueprint / C++ developer specializing in multiplayer/replication, gameplay systems (including GAS), UMG/UI architecture, and performance optimization. I help clients ship robust real-time experiences, from prototypes to production - games, architectural visualization, and training applications. My expertise includes optimization, scalable system design, gameplay programming, UI development, and technical problem solving. I believe successful projects depend on clear communication and aligned expectations. I work proactively, identify technical risks early, and keep clients informed throughout development. When challenges arise, I focus on finding practical solutions and alternative approaches tailored to the project and its goals and constraints. My Unreal Engine skills include: - Multiplayer & replication - Profiling & optimization - UMG / UI architecture - C++ + Blueprint coding - Technical design - Gameplay Ability System (GAS)

  • Unreal Engine
  • C++
  • Game Development
  • Game Design
  • Game Prototype
  • Multiplayer
Vitalii A.

Wroclaw, Poland

$30/hr
5.0
38 jobs

I have more than 15 years of programming experience. As a freelancer, I have broad experience: I developed web (ASP.NET, Python, PHP), desktop (C++, C#, Python — Linux and Windows) and mobile (Android — Java, C++) applications. I list here some of my jobs. C#: * clubspeed.com — a large software suite for family entertainment clubs; included C# code (80%), including CoreApi and ASP.NET Razor, plus PHP (Laravel) and Node.js code (for low-level car racing control tasks). I developed it as a team member. * qadra.com — a financial company; C# code (80%), Python (some microservices are Python/Flask based, 20% of code), AWS-hosted with Docker containers and Lambdas. I developed it as a team member. * enven.nl — implemented from scratch their non-public partners portal: ASP.NET Razor and some CoreApi endpoints. * ASP.NET website for house rentals. * ASP.NET website for remote control of a robotic device via a WebSocket connection. * Vegetable-oil plant automation desktop program (C# + WinCC). Python: * Embeddable fact-checking chat that uses the LangGraph framework to implement a customizable LLM/AI backend (OpenAI, DeepSeek, Hugging Face, or Ollama). It allows administrators to embed the component in their websites so users can ask questions about facts described in articles and verify whether facts listed in an article are true. It included agentic code and many external APIs to check facts (not just asking an LLM), and even computer vision to inspect website photos (OpenCV). Backend is FastAPI. * AI/LLM-based ad selection for a website (FastAPI and LangGraph). It processes website text or chat messages and selects ads of different types related to the content. It contains SDKs for embedding ads on many platforms, including Go, React, and plain HTML. * Polish-language training software, based on Django and LangGraph. * Many small projects: desktop scripts, web scraping (Selenium and related tools), and simple AI agents. C++: * Factory equipment monitoring system (Ubuntu Linux, custom server over TCP/IP, web interface in PHP). * Many small projects, some of which are mentioned in reviews on this profile; many are non-public. * Powerful software for automated ad submission on social networks (massive bots that send millions of messages). PHP: * 20+ websites — without CMS, with my own CMS, and with open-source Drupal, WordPress and Joomla CMSs. * Backends for Android applications. Android: * SOCKS5 proxy application that allows sharing mobile VPN with non-mobile clients via the SOCKS protocol. * Many WebView-based "business card" applications. * Dating-related applications, including erotic puzzles. Human emulation: * Spam bots — I cannot provide a specific list of such software for legal reasons. * Automatic checkout on eBay and similar websites. * PayPal automatic payments. * Data scraping, including air tickets and goods in online stores. Reverse engineering — I cannot provide a specific list of reverse-engineered software for legal reasons. * Java bytecode reverse engineering, including Android. * .NET bytecode reverse engineering. * Machine code for 32-bit and 64-bit x86 and ARM CPUs. Assembler: * High-performance cryptographic library for x86\_64 CPUs.

  • C#
  • .NET Framework
  • MySQL Programming
  • JavaScript
  • PHP
  • Python
  • ASP.NET
  • VB.NET
  • Node.js
  • HTML
  • Java
  • C++
  • .NET Core
  • ASP.NET Core
  • .NET Stack
  • Microsoft Windows
  • Android
  • Linux
Dmitry T.

Warsaw, Poland

$30/hr
5.0
15 jobs

Hello, Im a developer with 15 years of working experience. I have been working for companies from Russia, USA, Canada, Australia, Philippines. Have created applications for desktop, mobile and web. Main specialization - .NET stack (WPF, ASP.NET, Avalonia, MAUI), but also have experience in other areas. Have bachelor degree in applied math and computer science. Have rich expirience of using Selenium for automatization work with websites or data crawling. Main skills: Back-end: Asp.Net MVC, basic knowledge of NodeJS. Desktop: WPF, Avalonia. Mobile: MAUI, Xamarin. Front-end: Angular, Typescript, JQuery, AngularJS, Bootstrap, Chrome extensions Testing: Selenium, NUnit, Moq Infrastructure: Teamcity, Octopus, Azure Devops, gRPC, Git, SVN, JIRA Have worked with different DB: mostly MS SQL, but also MySQL, SQLite, Postgres. Have experience using ORM (EF Core, NHibernate) and directly accessing DB (Dapper). Could work both in team and as a separate developer. I have good learning ability - if I don't know something, usually it doesn't take much time to understand it. I have good skills in understanding code written by other developers, know how to write unit tests. I'm working with AI-tools: Claude code, Gemini, QWEN code.

  • C#
  • Microsoft SQL Server
  • ASP.NET MVC
  • TypeScript
  • Windows Presentation Foundation
  • JetBrains TeamCity
  • .NET Framework
  • Git
  • Angular
  • ASP.NET Web API
  • Microsoft Azure
  • Xamarin
  • .NET Core
Andrei M.

Warsaw, Poland

$45/hr
5.0
29 jobs

✅ .NET Full Stack Developer 20+ years of experience ✅ Build powerful .Net solutions that drive business growth ✅ C# .Net developer with 15+ years of experience ✅ Developed 50+ applications ✅ Crafted 200+ user-friendly interfaces that drive real business results. The clients say "It doesn't feel like outsourcing, but instead like we have our own remote developers." "They had great soft and hard skills and were full of ideas and drive!" I lead the fullstack and mobile development team at Itexus, a professional software development and consulting company focused on Fintech, Insurance, Healthcare, etc. I have 20+ years of experience in the .net architect development of web and mobile applications, .net, python, node.js, java developer as well as javascript, react .net, angular, AI frameworks and libraries. 👨‍💻.NET Full Stack Expertise .NET full stack – strong background in End-to-end development from database to UI using Microsoft stack .NET Core – deep expertise, cross-platform backend services .NET Angular – Full stack development on .NET backend and Angular frontend for enterprise-grade solutions .net core angular – Building complete systems with seamless backend–frontend integration .NET Core Angular – Scalable and secure web apps using .NET Core and Angular Angular .NET solutions – Using Angular for UI and .NET for API and business logic .net core developer – Proven experience delivering high-performance backend solutions using .NET Core .net core react – Building robust, scalable web applications with .NET Core APIs and React frontends c# .net developer – End-to-end development expertise using C# and the .NET ecosystem c# .net core – Advanced solutions built on C# with .NET Core for modern, cross-platform applications 👨‍💻 BACKEND Development Python: Expert in Python for server-side development Frameworks: Proficient in Django and Flask for building web applications Databases: Skilled in SQL, PostgreSQL, MySQL, and MongoDB for efficient data management Architecture: Experienced in applying MVC patterns for scalable applications APIs: Capable of integrating external services through REST and GraphQL 👨‍💻 FRONT END Development Proficient in HTML5, CSS responsive, JavaScript Experienced in React.js, Angular, Vue.js, react native, ionic, xamarin developer Responsive, cross-browser, ui/ux designer, ux/ui dashboard, ui ux designer app 👨‍💻AI TOOLS OpenAI API, DeepFace, ML/DL frameworks (TensorFlow, Keras, PyTorch, Scikit-learn), LangChain, Mistral, AgenticAI, Transformers RAG + custom AI tools: Document recognition and processing, Market Grabber, project management bots, AI for telephony, video/audio analysis Mobile App Development Native Mobile Development: Android, Kotlin, Java, iOS, Swift, KMP, KMM. Cross-Platform/Hybrid App Development: Flutter, Swift, Objective C, React Native, Xamarin, MAUI. General Expertise Website & Full Stack Development: Full stack development with ai .net full stack developer, .net software engineer, .net programmer, full stack developer, ai python full stack developer django, full stack web developer, full stack development, cms developer DevOps/DevSecOps: AWS, Azure, Docker, Kubernetes, GitLab-CI, Ansible, Terraform, etc Cross-platform app building with three.js, web application design, webflow web designer, website builders Integration tools: Data integration, websockets, ABP Framework, discord, Autotask Experienced in .net core web api, fullstack .net developer roles, with strong skills as a .net specialist. Skilled angular .net react developer, java developer with solid c sharp expertise. Worked on kogito for business automation, delivered ui ux-focused solutions. As an azure data engineer, handled scalable data pipelines. rust developer, python projects include backend developer tasks. Built app as a xamarin and web developer using java and javascript. Skilled in postgresql and web scrapping. Maintained legacy systems with .net webform. Collaborated with nft marketers, managed nft collab manage tasks. Full stack with react nodejs, modern react, including react typescript, react native developer roles. Acted as product owner in agile teams. Cloud deployments done on azure. Built interactive UIs using blazor. Why Choose us Microsoft certified talented developers and senior .net developer team High QA standards, including qa engineer roles Modern solutions: NFT programmer, metaverse, Microsoft .net, windows 10, Power Apps developer, SharePoint, market grabber Scalable team: full stack software developer, front end programmer, ios developer, ui ux designer Our Mobile App Development Services: Android App Development Swift iOS Development Native Mobile App Development Flutter App Development Cross-Platform App Development MVP App Development Startup App Development eCommerce App Development Marketplace App Development Booking App Development Mobile App UI Development iOS Android Seek new projects to put our .net ai, bring value to individuals, startups, companies.

  • C#
  • React
  • Angular
  • .NET Framework
  • JavaScript
  • ASP.NET Core
  • Mobile App Development
  • Android App Development
  • iOS Development
  • Artificial Intelligence
  • TypeScript
  • Web Application
  • AI Development
  • Android
  • AI Agent Development
  • Python
  • Node.js
  • React Native
  • MySQL
  • Mobile App Redesign
Anton K.

Wroclaw, Poland

$40/hr
5.0
91 jobs

I build AI-powered automations and modern web applications. What I deliver: — AI integration (OpenAI, Gemini APIs) into existing systems — Automated workflows and data pipelines (n8n, custom scripts) — Fullstack apps: Next.js, React, Supabase, Stripe — iOS apps with Swift — Infrastructure: AWS, Docker, CI/CD, Terraform 5+ years in web development, now focused on AI integration and modern TypeScript stack. Also available for: Laravel/PHP backends, Python scripting, web scraping, WordPress.

  • Python
  • jQuery
  • Bootstrap
  • HTML5
  • PHP
  • JavaScript
  • MySQL
  • WordPress
  • Laravel
  • MySQL Programming
Krystian D.

Krakow, Poland

$95/hr
5.0
93 jobs

I am a software architect & developer with over 18 years of experience. I specialize in designing, developing and connecting various systems and technologies together, starting from embedded systems, through web, mobile and desktop applications, ending on backend (server-side) software. I'm also system administrator and a Linux-geek. Feel free to contact me if you have any work to do! Especially C++/C/Python/C#/Linux related. You can find much more information on my website. I also encourage you to check my GitHub profile.

  • C#
  • C
  • Python
  • Java
  • C++
  • HTML5
  • SQL
  • Linux System Administration
  • System Automation
  • TCP/IP

How it works

Post a job for freePost a job

Tell us what you need. Create your own job post or generate one with AI then filter talent matches.

Hire top talent fast

Consult, interview, and hire quickly, so you can meet the freelancers you're excited about.

Collaborate easily

Use Upwork to chat or video call, share files, and track project progress right from the app.

Payment simplified

Manage payments in one place with flexible billing options. Only pay for approved work, hourly or by milestone.

Don't just take our word for it

How do I hire a C# Developer & Programmer in Poland on Upwork?

You can hire a C# Developer & Programmer in Poland on Upwork in four simple steps:

  • Create a job post tailored to your C# Developer & Programmer project scope. We'll walk you through the process step by step.
  • Browse top C# Developer & Programmer talent on Upwork and invite them to your project.
  • Once the proposals start flowing in, create a shortlist of top C# Developer & Programmer profiles and interview.
  • Hire the right C# Developer & Programmer for your project from Upwork, the world's largest work marketplace.

At Upwork, we believe talent staffing should be easy.

How much does it cost to hire a C# Developer & Programmer?

Rates charged by C# Developers & Programmers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.

Why hire a C# Developer & Programmer in Poland on Upwork?

As the world's work marketplace, we connect highly-skilled freelance C# Developers & Programmers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream C# Developer & Programmer team you need to succeed.

Can I hire a C# Developer & Programmer in Poland within 24 hours on Upwork?

Depending on availability and the quality of your job post, it's entirely possible to sign up for Upwork and receive C# Developer & Programmer proposals within 24 hours of posting a job description.