Hire the Best .NET Core Developers in Warsaw, PL

Full-Stack Developer (5 years) — TypeScript • Node.js • React/Next.js • .NET (C#) I’m a full-stack developer with 5 years of commercial experience building web applications, APIs, and end-to-end product features. My primary stack is JavaScript/TypeScript with Node.js, React, and Next.js, and I also bring strong backend experience with C#, .NET, and ASP.NET Core—so I can work comfortably across the entire system. What I can help with Building and scaling React/Next.js apps (SSR/SSG, routing, auth, dashboards) Designing and implementing REST APIs (Node/Express/Nest or ASP.NET Core) Database work: schema design, migrations, query optimization Integrations: payment providers, third-party APIs, webhooks Performance & reliability: caching, background jobs, error handling, logging Quality: TypeScript-first code, tests, code reviews, clean architecture Fixing and modernizing existing codebases (refactors, upgrades, tech debt) Tech stack TypeScript, JavaScript, Node.js, React, Next.js, Express/NestJS, C#, .NET, ASP.NET Core, PostgreSQL/MySQL, MongoDB, Redis, Docker, Git, CI/CD (GitHub Actions/GitLab CI), Jest/RTL, Playwright/Cypress. How I work I start by clarifying goals and constraints, then deliver in small, reviewable increments with clear status updates. You’ll get maintainable code, predictable progress, and a smooth handoff with documentation. If you share your brief or repo, I’ll reply with a short plan—quick wins, timeline, and the best approach for your next release.

I’m a Senior .NET Developer with over 15 years of hands-on experience building robust, high-performance desktop applications using technologies like WPF (MVVM), WinUI 3, and Windows Forms. I specialize in delivering smooth, modern user interfaces and stable architecture for Windows-based solutions. Tech Stack & Skills: ▪️ UI/UX: WPF (MVVM), WinUI 3, Windows Forms, GDI+ ▪️ .NET Ecosystem: .NET (C#), ADO.NET, Entity Framework, LINQ, WCF, ASP.NET MVC ▪️ Databases: MS SQL Server, SQLite, LightDB ▪️ APIs & System Integration: WinAPI, Azure integration, Google Cloud Platform ▪️ Other Languages: Solid experience in Python and working with LLMs Education: ▪️ MSc in Artificial Intelligence

I am a Senior Full-Stack .NET Developer with 10+ years of experience building scalable SaaS platforms, enterprise applications, cloud-native backends, and AI-powered solutions. I specialize in modern Microsoft technologies including .NET 10, .NET 9, ASP.NET Core, Minimal APIs, Clean Architecture, CQRS, SignalR, Hangfire, OpenTelemetry, and distributed backend systems using MassTransit. I help startups and enterprise clients build high-performance applications from architecture and backend APIs to modern front-end interfaces and cloud deployment pipelines. Core Expertise Backend & Cloud Development - .NET 10 / .NET 9 / ASP.NET Core - REST APIs & Minimal APIs - Clean Architecture & CQRS - SignalR real-time applications - Background processing with Hangfire - Distributed systems & event-driven architecture - OpenTelemetry observability - MassTransit messaging - Authentication & authorization systems - Multi-tenant SaaS architecture Front-End Development - React - Angular (2+ through latest versions) - TypeScript - Material UI - Responsive web applications Cloud & DevOps - Azure - Docker - Azure DevOps - GitHub Actions - Nginx - CI/CD pipeline automation Databases & Infrastructure - PostgreSQL - Redis - Elasticsearch - CosmosDB - SQL Server AI & Automation - AI Agents - AI workflow automation - Semantic Kernel - AI-assisted business applications - Process automation solutions Integrations I have extensive experience integrating third-party APIs and business platforms including: - Stripe - Twilio - Google APIs - Cloudflare - Slack - Facebook APIs - CallTrackingMetrics - Yelp - Yext Additional Expertise - SaaS platforms - CRM/ERP systems - Ecommerce applications - Healthcare platforms Browser automation - CAPTCHA solving - Advanced web scraping and data extraction systems I can work on both long-term product development and short-term high-priority projects. I focus on clean architecture, maintainable code, performance, and fast communication throughout the development process. If you need a senior engineer who can quickly understand business requirements and deliver production-ready solutions, feel free to contact me.

Hello! I'm Vera — a junior .NET developer and a fourth-year Artificial Intelligence engineering student based in Warsaw. I specialize in backend development using C# and .NET, application architecture, and integrating machine learning models as independent services. My experience includes building web, desktop, and distributed systems, with a strong focus on clean, modular design. I work with: • C# / .NET (ASP.NET Core, WPF, Windows Forms) • REST API design and backend logic • Machine learning model integration (Python ↔ .NET) • AI training and data preparation tasks • Image processing and ML inference workflows • Docker & Docker Compose (multi-service environments) In addition to development work, I am also interested in **AI training projects**, including data annotation, model testing, evaluation, and support tasks related to machine learning pipelines. I am looking for internship opportunities, junior development tasks, and AI training projects. I can work independently, follow technical requirements, and collaborate effectively within a team. Let’s work together to turn ideas into reliable and practical solutions.

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.

✅ .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.