Hire the Best .NET Core Developers in Barcelona, ES

Welcome to Mehrshad’s Team! Expertise: Game Development (Unity, Ogre) Mobile Apps (React Native) Website Development (React JS, ASP.NET) Greetings from Mehrshad's collaborative team! We're not just individuals; we're a dynamic collective committed to delivering top-notch projects. Our versatile skills cover a spectrum of domains, including: Unity Game Development: Immersive games for PC and mobile platforms are our speciality. With expertise in Unity, we craft captivating gaming experiences that leave a lasting impact. Mobile App Development: Proficient in creating high-quality Android and iOS applications, our team caters to diverse user needs, ensuring functionality and user satisfaction. Website and Web Application Development: Designing visually appealing, user-friendly websites and web applications is our forte. Tailored to specific business requirements, our creations stand out for their interactivity and functionality. By pooling our skills and expertise, we offer comprehensive solutions that empower businesses and provide delightful user experiences across various platforms. Join us on the journey of turning ideas into exceptional realities!

⭐ Microsoft Certified Developer ⚡ Senior Full-Stack .NET Core Developer 10+ years | 50+ enterprise systems | API Integration & Azure Expert | C# / ASP.NET Core / SQL Senior Full-Stack Developer with 10+ years of experience delivering 50+ enterprise-level Web Development and Web Application systems using C#, .NET Framework, ASP.NET, ASP.NET Core, ASP.NET MVC, JavaScript, React, Angular, AngularJS, TypeScript, HTML, HTML5, CSS, API, API Development, RESTful API, API Integration, Microsoft SQL Server, PostgreSQL, SQL, Microsoft Azure, Azure DevOps, CI/CD, Amazon Web Service, Node.js, PHP and Python. I build scalable Web Application platforms with clean API Integration, optimized SQL, and production deployments on Microsoft Azure using C#, .NET Core, ASP.NET Core, React, Angular and JavaScript. I also develop AI powered systems using OpenAI API, OpenAI, Claude, Claude API, LangChain, FastAPI, RAG, Artificial Intelligence, Machine Learning and Natural Language Processing. If you need a developer who can build scalable production-ready systems fast let’s talk. I have built 100+ API Integration and API Development solutions using C#, .NET Core, .NET Framework, ASP.NET, ASP.NET Core, ASP.NET MVC and RESTful API architecture, integrating systems across Microsoft Azure, Azure DevOps, CI/CD pipelines and Amazon Web Service. I have implemented 70+ automation workflows using API Integration, Node.js, Python, FastAPI and SQL-based processing across Microsoft SQL Server and PostgreSQL environments. I have delivered 50+ Web Application systems including SaaS platforms, internal tools, dashboards and integration-heavy solutions using C#, ASP.NET Core, .NET Core, JavaScript, React, Angular, AngularJS, TypeScript, SQL, Microsoft SQL Server, PostgreSQL and API Integration deployed on Microsoft Azure and Amazon Web Service. My focus is combining backend architecture with modern Web Development and Web Design for scalable systems. ⚡ What I Build 🔹 Web Application systems processing 100k+ API requests daily using C#, ASP.NET Core, RESTful API, API Development, Microsoft SQL Server, PostgreSQL and SQL optimization 🔹 Integration-heavy platforms using C#, .NET Framework, ASP.NET MVC, ASP.NET Core, API Integration, RESTful API and Node.js connected to CRMs, SaaS tools and external APIs 🔹 Cloud-based systems deployed on Microsoft Azure, Azure DevOps, CI/CD and Amazon Web Service with scalable backend architecture 🔹 Frontend interfaces using JavaScript, React, Angular, AngularJS, TypeScript, HTML, HTML5 and CSS with responsive Web Design 🔹 AI powered features using OpenAI API, OpenAI, Claude, Claude API, LangChain, FastAPI, RAG, Artificial Intelligence, Machine Learning and Natural Language Processing integrated into existing Web Application platforms ⚡ What Makes Me Different Most developers build features. I build scalable systems. As a Senior Full Stack Developer, I focus on: 🔹 API Development and RESTful API architecture using C#, .NET Core, ASP.NET Core and ASP.NET MVC 🔹 Complex API Integration across enterprise systems using Microsoft Azure and Azure DevOps 🔹 High-performance Microsoft SQL Server, PostgreSQL and SQL optimization 🔹 Cloud-native deployment using Microsoft Azure, Azure DevOps, CI/CD and Amazon Web Service 🔹 Full-stack Web Development using JavaScript, React, Angular, AngularJS, TypeScript, HTML, HTML5 and CSS 🔹 AI powered automation, ai agent workflows and AI Integration using OpenAI API, OpenAI, Claude, Claude API, LangChain and FastAPI I design systems where C#, ASP.NET Core, .NET Core, Microsoft SQL Server, PostgreSQL, SQL, React, Angular and Microsoft Azure work as a unified architecture. My focus is production-grade Web Application systems with clean API Integration, scalable infrastructure and maintainable backend architecture built with C#, .NET Framework, ASP.NET, ASP.NET Core and ASP.NET MVC. ⚡ Core Stack C#, .NET Core, .NET Framework, ASP.NET, ASP.NET Core, ASP.NET MVC, JavaScript, React, Angular, AngularJS, TypeScript, Node.js, PHP, Python, HTML, HTML5, CSS, SQL, Microsoft SQL Server, PostgreSQL, Microsoft Azure, Azure DevOps, CI/CD, Amazon Web Service, API, API Development, RESTful API, API Integration, Web Development, Web Application, Web Design, OpenAI API, OpenAI, Claude, Claude API, LangChain, FastAPI, ai agent, ai automation, ai powered systems, RAG, Artificial Intelligence, Machine Learning, Natural Language Processing. I am currently available for Web Development, API Development, API Integration, AI Integration, ai automation and enterprise .NET development using C#, ASP.NET Core, .NET Core, Microsoft SQL Server, PostgreSQL, Microsoft Azure, React and Angular.

I help businesses streamline operations, modernize legacy workflows, and build reliable custom software using AI-assisted development, automation, and data-driven systems. With 25+ years of experience in software development and business process consulting, I combine deep ERP/MRP expertise with modern AI-enabled engineering practices to deliver solutions faster, with strong attention to quality, scalability, and real business outcomes. I specialize in: • AI-assisted software development and workflow automation • AI-powered analytics, internal tools, and decision-support workflows • API integrations, ETL pipelines, and business automation • ERP/MRP implementation, customization, and optimization • Business process analysis and digital transformation • C# / .NET, ASP.NET Core, and Blazor application development • PostgreSQL and SQL Server database design, optimization, and reporting • Financial software, trading tools, and market-data platforms • Stock screening, technical analysis, and market-monitoring systems Technical expertise: • AI-assisted development workflows, LLM integrations, and automation • TradingView, financial APIs, market data, and analytics • Cloud-based business applications • REST APIs and third-party system integrations • C#, .NET, ASP.NET Core, Blazor • Python for automation, data processing, and AI integrations • PostgreSQL, SQL Server, database performance tuning Recent project examples: ✔ Stock screening and technical-analysis applications ✔ AI-assisted workflow automation to reduce repetitive operational work ✔ ERP/MRP consulting and implementation for manufacturing businesses ✔ Custom inventory, production planning, and reporting systems ✔ Financial market-data collection and processing platforms ✔ Automated trading and market-monitoring tools ✔ Database performance optimization and reporting projects My approach is practical and business-focused: I use AI where it creates real value—accelerating development, automating repetitive work, improving analysis, and helping teams make better decisions. The goal is always the same: efficient, maintainable software that produces measurable results. If you need an ERP consultant, database specialist, AI-enabled software developer, financial software engineer, or automation expert, I’d be glad to discuss your project.

Web developer able to build a solid web app from the ground up. Committed to writing clean, efficient, and scalable code. I've developed an application for a start-up and I m currently working as web developer.

With over 15 years in mobile game development, I focus on creating systems that are both scalable and maintainable. My experience spans Unity and software architecture, applying both Data-Oriented Design (ECS) and Object-Oriented Design (OOP) to solve complex challenges. I’ve contributed to large-scale projects with millions of players worldwide, always ensuring performance and stability through feature flags, safe rollouts, and thoughtful system design.

I’m a .NET developer with 15+ years of experience building and maintaining production systems, including high-load and legacy-heavy environments. My core stack aligns directly with your requirements: C#, ASP.NET Core (Web API), Entity Framework (Code First), and MS SQL, with practical experience designing scalable backend services and optimizing performance-critical paths. In addition to backend development, I also have strong frontend experience with Angular and TypeScript, building complex SPA applications, integrating REST APIs, and maintaining large-scale enterprise frontend codebases. I’m comfortable working across the full stack and coordinating frontend/backend architecture to keep systems maintainable and scalable. I’ve worked on systems handling large request volumes (up to ~1M requests/day), where I focused on diagnosing bottlenecks (indexes, query plans, inefficient procedures) and improving performance without breaking existing behavior. Most of my work involved real-world constraints: legacy code, evolving business logic, and the need to extend systems cleanly instead of rewriting them. On the cloud side, I have hands-on experience with Azure services and understand how to design distributed systems: REST APIs, inter-service communication, and asynchronous processing patterns. I’m comfortable working with messaging (Service Bus–style patterns), storage, and scalable architectures that fit IoT-like workloads. I follow clean architecture principles, participate actively in code reviews, and work with CI/CD pipelines (Azure DevOps). I also use unit testing tools like xUnit and Moq when it makes sense for system stability and regression protection. What makes me a strong fit for your team: • Strong full-stack experience with both backend (.NET/C#) and frontend (Angular/TypeScript) • Experience working on long-term products and stable teams, not just short freelance engagements • Focus on practical, maintainable solutions rather than overengineering • Ability to work independently and contribute to architecture decisions • Hands-on experience dealing with real production issues, not only greenfield development Technologies that I have used in my projects: Languages: C#, SQL, JavaScript, TypeScript Frontend: Angular 18, NgRX, RxJs, SignalR, HTML, SCSS, Material Backend: .NET Core, ASP.NET Web API, AWS Lambda, Amazon S3, ASP.NET MVC, Docker, RabbitMQ, CosmosDB, Azure DBMS: SQL Server, PostgreSQL, SQLite, Access DB, T-SQL, LINQ, Entity Framework, EF code first, ADO.NET Testing: NUnit, XUnit, MS Test, Moq Cloud: Azure Portal, Azure DevOps Operating Systems: Windows Version Control: GitHub, Bitbucket