Hire the Best .NET Framework C# Engineers
in Argentina

I work best on software that is already a little complicated: desktop agents that need to stay running reliably, APIs connecting several systems, older code that needs to be improved without breaking production, or AI features that need to behave like part of a real product rather than a demo. Over the past 8+ years, I’ve worked across Windows, macOS, web, mobile, backend, and cloud systems, with most of my recent work focused on architecture, cross-platform development, performance, reliability, and AI integration. At iMonitorSoft, I led architecture and core module development for enterprise monitoring agents across Windows, macOS, and iOS. That involved system-level tracking of file, application, and network activity, background processing, communication and synchronization between components, platform-specific integrations, performance tuning, and AI-based event classification. Before that, I worked on full-stack web and mobile products using Python, Node.js, React, React Native, AWS, and GCP, taking projects from early product requirements through backend development, integration, deployment, and production support. CORE EXPERTISE ⚙️ C++ / .NET / CROSS-PLATFORM SYSTEMS - C++, C#, .NET, Swift, Objective-C - Windows and macOS desktop applications - Background services and long-running agents - File, application, network, and system event processing - OS-level and platform-specific integrations - Communication protocols and data synchronization - Performance, stability, and resource optimization - Debugging and modernization of existing applications 🧠 AI & AUTOMATION - LLM integration into existing software - NLP and recommendation features - AI-based classification and workflow automation - Hugging Face and TensorFlow - AI-backed APIs and application features - Connecting AI services with existing backend and product workflows 🔗 BACKEND & FULL-STACK - Python, FastAPI, Node.js, Express - React, Next.js, TypeScript, Vue.js - REST APIs and third-party integrations - PostgreSQL, MySQL, MongoDB, SQLite - SaaS backend architecture - Refactoring and extending existing codebases - Debugging issues that span multiple services ☁️ CLOUD & INFRASTRUCTURE - AWS and GCP - Docker and Kubernetes - CI/CD pipelines - Production deployment - Backend and service architecture - Troubleshooting performance and reliability issues THE KIND OF WORK I USUALLY TAKE ON - Fixing an application that has become unstable or difficult to maintain - Building or improving Windows and macOS desktop software - Developing Python, Node.js, or .NET backend services - Connecting desktop applications with APIs and cloud services - Modernizing an older codebase without rewriting everything - Integrating AI or LLM functionality into an existing product - Investigating performance, synchronization, or reliability problems - Reviewing an architecture before a product becomes harder to scale - Taking ownership of a technically complex feature from design through production I’m generally careful about recommending rewrites. If there is an existing system, I prefer to understand how it works first, reproduce the problem, and fix the underlying issue without replacing parts that are already doing their job. Sometimes that means working deep in a C++ or .NET component. Other times it means restructuring a Python API, improving communication between desktop and cloud services, adding an AI workflow, or cleaning up an architecture that has grown difficult to extend. TECHNICAL STACK Languages: C++, C#, Python, JavaScript, TypeScript, Swift, Objective-C, Go Backend: FastAPI, Node.js, Express, .NET Frontend: React, Next.js, Vue.js Databases: PostgreSQL, MySQL, MongoDB, SQLite AI: LLM Integration, NLP, TensorFlow, Hugging Face Cloud: AWS, GCP, Docker, Kubernetes, CI/CD Platforms: Windows, macOS, iOS, Android, Linux HOW I APPROACH A PROJECT - Understand the existing system before changing it - Reproduce problems instead of guessing at them - Keep architecture understandable and components well separated - Give short, clear updates while I work - Think about failure cases, not just the happy path - Leave code in a state that another engineer can comfortably continue working with If you’re building something technically demanding, dealing with an existing system that needs experienced attention, or trying to connect desktop, backend, AI, and cloud pieces cleanly, feel free to send me the details. I’m happy to look at what you have and tell you how I’d approach it.

My name is Alejandro Martin. I am Systems Enginering. I have more than 7 years of experience developing in .net c# and three years leading teams in new projects. I have experience using winform, webform, wpf, .net mvc, webapi, swagger, azure, sql server, mysql, javascript, jquery, vuejs, angular, react and git

👨‍💻 About Me I'm a Senior Software Engineer & Technical Leader with over 8 years of experience delivering scalable, high-performance web applications and APIs. I specialize in Next.js, React, NodeJS, .NET Core and Angular. 🧩 Core Skills Frontend: React, Angular, Next.js, Bootstrap, MUI Datagrid, Tailwind CSS Backend: .NET Core, Node.js Databases: SQL Server, MongoDB, Redis Dev Tools: Git, Azure DevOps, Docker, CI/CD pipelines 🔌 API Integration Expertise I have extensive experience integrating third-party services like: Stripe (payments) Calendly (scheduling) Auth0 (authentication) Facebook API (social platforms) These integrations are implemented with performance, security, and long-term maintainability in mind. 👥 Leadership Experience As a Technical Leader, I’ve: Led a team of 10 developers on an e-commerce builder platform Designed software architecture and improved backend performance Prioritized product requirements with stakeholders Conducted code reviews and mentored junior developers ✅ What You Can Expect Clean, maintainable code Reliable API integrations Performance-focused backend systems Clear communication and on-time delivery Let’s work together to bring your product vision to life!

Very passionate about programming, IT, and computer science world. Proactive, with high predisposition for teamwork. Every time ready for learn new stuffs and share my knowledge. I'm a degreed programming & IT Support technician from the EEST N°2 high school of Mar del Plata. Having a special mention for participate in the regional science fair, having participated as a project in the development of a software that manages the store of the high school. Currently in the last year of a high technician in system analysis, at the ISFT N°151 from Mar del Plata.

Looking for a developer who understands Computer Science principles, not just syntax? I am a final-year Computer Engineering student specializing in Backend Development with .NET (C#) and Data Management. My background allows me to build robust, scalable, and clean solutions for your software needs. I don't just "write code"; I solve logic problems. Whether you need to fix a bug in your API, optimize a SQL query, or build a backend module from scratch, I bring an engineering mindset to every task. 💻 Technical Stack & Services: Backend Core: C#, .NET Core / ASP.NET, MVC Architecture. Databases: SQL Server, SQLite, PostgreSQL, MySQL (Entity Framework Core). API Development: RESTful APIs design and implementation. Logic & Scripting: Complex algorithms, data structures and automation. Tools: Git/GitHub, Visual Studio. 🚀 Recent Projects: WeAreKanban: A full-stack MVC task management app with user authentication and drag-and-drop features. Chaos Order (RPG): A complex console-based RPG game demonstrating advanced Object-Oriented Programming (OOP) and logic. 👨‍🏫 Why work with me? Communication: I was a University Teaching Assistant, so I know how to explain technical concepts clearly. Language: Fluent in English (B2) and Native Spanish. Reliability: As an engineering student close to graduation, I am disciplined, detail-oriented, and deadline-driven. Let's discuss how I can help you move your project forward. Click "Invite to Job" and let's chat!

Is your PrestaShop store broken, slow, or missing a key feature? I'll fix it — fast, clean, and with clear communication throughout. I'm a PrestaShop specialist and Full Stack Developer with 5+ years of hands-on experience building custom modules, migrating stores, configuring VPS servers, and solving complex bugs in production environments. I currently work as a Software Engineer at Mercado Libre — Latin America's largest tech company — which means I build and maintain systems at scale every day. On Upwork: 100% Job Success Score, Rising Talent badge, and a track record of delivering on time and communicating proactively. ────────────────────────────────── PRESTASHOP — What I can do for you: ────────────────────────────────── ✔ Custom module development (PS 1.6 / 1.7 / 8.x) ✔ Theme customization & complete store redesigns ✔ VPS setup, NGINX/Apache configuration & SSL ✔ Store migrations (version upgrades or server changes) ✔ Bug fixes: cache conflicts, session errors, white screens, hook issues ✔ Performance optimization (Redis, caching layers, DB queries) ✔ Payment gateway & third-party API integrations ────────────────────────────────── FULL STACK — Beyond PrestaShop: ────────────────────────────────── ✔ React / Next.js frontends (Redux Toolkit, Zustand) ✔ PHP backends with Symfony ✔ Node.js / Express APIs ✔ .NET 8 + Entity Framework + Microservices ✔ MySQL, PostgreSQL, Redis, ElasticSearch ✔ CI/CD pipelines with GitHub Actions & Docker ────────────────────────────────── WHY CLIENTS CHOOSE ME: ────────────────────────────────── → I respond within 4 hours and keep you updated at every stage → I write clean, documented code — not quick patches that break later → I've handled both small urgent fixes and long-term development projects → English (conversational) + Spanish (native) — no communication barriers Whether you need a quick bug fix or a full store rebuild, I'll make sure the job is done right. Let's talk about your project.