✅ .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
Industries
Banking, Trading, Cryptocurrency, Asset Management, Lending, Retail, Real Estate & Property Management, Food Delivery, Entertainment, Hospitality, Construction, Sports & Fitness, Travel & Tourism, Wellness, Medical Dashboard, Marketplace, E-commerce, Automotive, Human Resources, Education, E-learning, AI Assistants
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
Django
Joseph C.
Gdansk, Poland
$150/hr
5.0
31 jobs
I've worked in every domain of software. Tell me what you're up to and I'll lead us through an effective solution.
- Backend specialist for 5 years at S&P and Banqsoft.
- Mobile specialist for 7 years with Diversido, Noble Muffins and other clients.
- Professional experience with React, TypeScript, C++ and Java.
I got my start when I took over IT at a horse trailer dealership to gather money to move to Europe.
At S&P, I took our team's first two microservices from zero to production. I later served as scrum master, and was given a technical excellence award for my work in SQL optimization.
As a game developer, my Turbo Slicer product has been featured repeatedly by the Unity Asset Store. I wrote a finite element analysis kit for PlayWay S.A. to manage building collapse for the games Construction Machines 2016, Demolish & Build 2017 and Demolish & Build 2018.
In my spare time I support new programmers on Codementor.io.
C#
Java
iOS Development
C++
Objective-C
Unity
Polish to English Translation
Marcin Z.
Lagow, Poland
$10/hr
5.0
5 jobs
I am a seasoned software developer with 20 years of experience, specializing in web development using .NET and ReactJS. In the past four years, I have honed my full-stack capabilities by building complex web applications and integrating APIs, while also implementing powerful solutions like Google Tag Manager. My unique journey from CNC programming and manufacturing automation to software development allows me to tackle challenges with a rigorous engineering mindset and innovative problem-solving skills. I have a solid foundation in Python for automating workflows and maintaining in-house applications. If you're looking for a reliable developer who can bridge the gap between technical precision and modern software practices, I’m here to help bring your projects to life. Let's connect and discuss how I can contribute to your success.
C#
Drive Software Solutions DRIVE
.NET Stack
.NET Core
.NET Framework
ASP.NET Web API
ASP.NET
ASP.NET Core
JavaScript
Web Application
Software Development
Python
React
TypeScript
LangChain
Alexey I.
Warsaw, Poland
$30/hr
4.7
22 jobs
Hi 👋 I’m a Unity programmer with 12+ years in game development.
I build games from prototype to full release across mobile, WebGL, and PC, and I’m equally comfortable joining mid-project to fix critical issues, optimize performance, or stabilize unstable builds.
Whether it’s a hyper-casual prototype, a mid-core RPG, or a multiplayer live-ops project — I deliver clean code, smooth gameplay, and reliable results. 🚀
🔹 What I do best
Full-cycle Unity development — take your project from concept and prototype to launch-ready game
Cross-platform builds — mobile, WebGL, PC, optimized for performance and memory
Multiplayer & live-ops systems — Photon, PlayFab, analytics, monetization, retention improvements
Expert bug fixing & optimization — tricky crashes, memory leaks, edge cases, build size reduction
Legacy code rescue — stabilize and refactor outdated, messy, or incomplete projects
🔹 Work style
Clear estimates and timelines before starting
Regular progress updates with measurable results (daily or weekly)
Open, fast communication; adapt quickly to feedback and changing priorities
Focus on delivering working, polished, release-ready projects
🔹 Why work with me
12+ years in game development (indie & enterprise)
Ability to deliver complete games for any genre and platform
Clean, maintainable code designed for long-term development
Strong debugging & optimization skills — fix critical bugs, improve performance, and reduce build sizes
Trusted to rescue mid-project when things aren’t working, without slowing the schedule
Clients praise my speed, reliability, and ability to deliver under tight deadlines
🛠 Tech Stack
Unity, C#, Addressables, Photon, PlayFab, DOTS, ShaderGraph, Firebase, C++, Ruby, Objective-C, SQLite, IronSource, JSON, Protobuf, dev2dev, Appsflyer, Game Analytics, Tenjin, IAPs, ByteBrew, Yandex SDK, React, JavaScript, Google Play Services, Zenject
🧠 Selected Results
PUA — Date Game & Love Stories: Created a custom scenario tool (cut content time 2h → 10min), implemented AI bots, fixed major production issues
Idle Spellbound Mage RPG: Reduced build size by 75%, enabling a successful WebGL port without losing features
Nanomedix: Transformed unstable, incomplete project into a release-ready product through stabilization, optimization, and feature expansion
Zombie Shop: Solved elusive critical bugs QA couldn’t reproduce, stabilizing a high-profile release
Merge Islanders: Enhanced core systems & performance; updates doubled revenue according to publisher
💬 Let’s talk
Need help with full-cycle Unity development, optimization, bug fixing, or launching a complete game?
I’m available for consultations, quick fixes, or long-term collaborations — let’s make your project a success.
C#
Unity
Game Development
Game Development Bug Fix
Game Prototype
Research & Development
Multiplayer
Photon Unity Networking
Game Design
Game UI/UX Design
Game Mechanics
Mobile Game Development
Mobile Game
WebGL
AR & VR Development
Anton K.
Wroclaw, Poland
$50/hr
5.0
89 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
Ihar P.
Krakow, Poland
$30/hr
4.2
42 jobs
Mobile Flutter Developer with DevOps expertise — building cross-platform iOS & Android apps and owning the full delivery pipeline: AWS, Kubernetes, Ansible, Terraform, CI/CD.
10+ years in software engineering. I deliver production-ready Flutter apps together with the infrastructure that builds, deploys, and runs them.
Flutter Development:
Flutter & Dart — performance optimization, clean architecture, responsive UI/UX
State management — BLoC, Provider, MobX, Riverpod
Animations & graphics — custom animations, CustomPainter, Rive/Lottie, shaders
Maps & geolocation — Google Maps, Mapbox, real-time tracking
Native integrations — platform channels, C++ libraries, real-time audio processing
App Store & Google Play deployment, release management
DevOps & Cloud Infrastructure:
Infrastructure as Code — Terraform, Ansible; Kubernetes orchestration with Helm
CI/CD — automated builds, testing, and deployments (GitHub Actions, Jenkins, GitLab CI, Fastlane, Docker), including mobile release pipelines to App Store and Google Play
Monitoring & observability — Prometheus, Grafana
Cloud platforms — AWS, Google Cloud (GCP), Hetzner; Linux server administration
Firebase & Supabase — auth, real-time database, cloud functions, hosting
Backend Development:
Node.js, Python, Java, Dart backends
API design — REST, GraphQL, gRPC, WebSockets
Databases — PostgreSQL, MySQL, MongoDB, Redis, SQLite
AI & LLM:
AI/LLM integrations in production apps — OpenAI, Anthropic (Claude), Gemini APIs
AI-assisted development workflow — Claude Code and OpenAI Codex
Experience: multiple production apps delivered end-to-end as a solo developer — UI, backend, cloud infrastructure, and deployment automation. Comfortable owning a product fully or working inside an experienced team.
I care about code quality, long-term maintainability, and delivering real value — not just completing tasks. If you need someone who understands mobile development, backend, and the infrastructure that connects them into a working product — I'd be glad to help.
= = = Career Highlights = = =
Oct 2024 – Present — Senior Flutter & DevOps Engineer
Building production Flutter apps end-to-end with cloud infrastructure and deployment automation: AI/LLM-powered features, real-time systems, infrastructure as code. Working independently, owning products from UI to deployment.
Stack: Flutter/Dart, Python, AWS & Google Cloud, Kubernetes, Terraform, Ansible, Docker, Firebase, Supabase, PostgreSQL, MySQL, Redis, MongoDB
Dec 2018 – Oct 2024 — Senior Flutter Developer
Six+ years of Flutter in production since its early releases: multiple apps shipped to App Store and Google Play, real-time and data-driven architectures, solo ownership from UI to backend.
Stack: Flutter/Dart, Supabase, Google Cloud, Firebase, PostgreSQL, SQLite, Linux
2015 – 2018 — Full-Stack JavaScript Developer
Web applications and data visualization for production use.
Stack: JavaScript (React, D3), Node.js, Python/Django, MongoDB
2010 – 2013 — Java Developer
Enterprise web applications. Earned Oracle Certified Professional, Java Programmer.
Stack: Java, GWT, Oracle DB
2006 – 2008 — Web Developer
First commercial projects; Linux as a daily driver since then.
Stack: PHP, JavaScript, MySQL, Linux
= = = Technologies = = =
Flutter • Dart • BLoC • Provider • Riverpod • MobX • CustomPainter • Rive • Lottie • Google Maps • Mapbox • Push Notifications • Firebase Cloud Messaging • In-App Purchases • Hive • CI/CD pipeline • GitHub Actions • Jenkins • GitLab CI • Fastlane • Docker • Kubernetes • Helm • Terraform • CloudFormation • Ansible • Prometheus • Grafana • Bash scripting • AWS • EC2 • S3 • EKS • Lambda • Google Cloud • GCP • Firebase • Supabase • Linux • Node.js • Python • Django • PostgreSQL • MySQL • MongoDB • Redis • REST API • GraphQL • gRPC • WebSockets • LLM integration • RAG • AI chatbot • OpenAI API • Anthropic API • Claude API • Gemini API • Claude Code • OpenAI Codex • Stripe • App Store • Google Play
Flutter
Dart
Mobile App Development
DevOps
Docker
Kubernetes
CI/CD
Terraform
Amazon Web Services
Ansible
Linux
Firebase
PostgreSQL
Google Cloud Platform
Jenkins
Supabase
Node.js
Python
API Integration
Location-Based Service
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
“Upwork provides an umbrella-level of security. I can see a talent’s work history and ratings. I can hold payments in escrow. I can communicate through Upwork Messages instead of working through my email address.”
KD
Kim Darling
Emerald Tiger
“Upwork is the best platform to hire skilled professionals when we're not looking for a full-time employee. All the companies in our portfolio use Upwork to find talent across a wide range of fields.”
DM
David Merry
Kinetic Investments
“Our very specific requirements can be a challenge—With Upwork, we’re able to access a bigger community to ensure the success of our projects.”
KK
Katja Krohn
Summa Linguae
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.
Find more freelancers
Top cities for C# Developers & Programmers in Poland