Hire the Best .NET Core Developers in Valencia, ES

I help teams build, improve, and maintain Python backend systems, especially applications with complex business logic or legacy code. I have 10+ years of software development experience and have focused mainly on Python backend development for the last 5+ years. My main stack includes Python, Django, Django REST Framework, FastAPI, Flask, PostgreSQL/MySQL, AWS, Docker, and Kubernetes. In my most recent role, I worked on Python microservices running in AWS. My responsibilities included moving services from EC2 to Kubernetes/EKS, integrating with other systems, upgrading legacy dependencies, improving performance, reviewing and refactoring code, handling releases, and resolving production issues. Before that, I worked as a senior Python engineer and tech lead on projects in fintech, healthcare, social media, recruiting, and other areas. I built REST APIs, worked with microservice-based systems, contributed to architecture and system design, and introduced automated testing into existing applications. A large part of my experience is working with existing systems that need to become easier and safer to change. I can help with: * Python backend development with Django, FastAPI, and Flask * REST APIs and microservices * Refactoring and modernization of legacy applications * Automated testing and improving test coverage * Performance and reliability improvements * AWS, Docker, Kubernetes, and production support * Backend architecture and technical design * Code reviews and technical leadership I am also the author of a technical article series about refactoring and testing a legacy Django application. Earlier in my career, I worked on complex financial, real estate, e-commerce, and distributed applications and led development teams. This gives me a broad background when working with large systems and complicated business requirements. I prefer long-term projects where I can understand the product well, take ownership of the backend, and help improve the system over time.

I'm a full-stack developer, 20 years of React and Node. Most of my work now is AI agents, LLM workflows and automation for Healthcare and MarTech companies, plus the systems that run them. The last AI pipeline I built serves 13,000 users. Where I've worked • Healthcare, four platforms between 2016 and 2025: dental imaging, workforce management for care providers, veterinary diagnostics (that one ran 32 months), and moving a US medical network off its legacy stack onto Azure. Clinical software is unforgiving about correctness and audit trails, so that is where I start. • MarTech, three clients since 2025 and two of them still running: an ORM agency's internal platform, attribution and real-time analytics microservices for a B2B ABM platform, and ad reporting at volume. AI I've shipped • A driving-theory exam app I built from nothing. React Native on iOS and Android, React on the web, Nest.js behind both, 13,000 users. Underneath it there's a RAG pipeline that writes and checks a library of 5,000+ questions against a syllabus the regulator rewrites every year, with AI image generation and Spanish/English translation feeding the same content flow. • An ORM agency that was running its whole operation out of Google Sheets. I moved it onto Supabase and PostgreSQL, built the app in Next.js and Node, then added AI flows on OpenAI and Edge Functions that took over monitoring and reporting people had been doing by hand. What usually goes wrong with AI projects The ones I've watched stall didn't stall on the model. It was auth, or getting at the data, or cost, or nobody being able to say what the thing did last Tuesday. That is ordinary engineering, and it happens to be what I've spent two decades on, a good part of it in regulated places where a security review is part of shipping. I'll also say when AI is the wrong tool for a job, since a plain script that costs nothing often does the same work. Stack: LangGraph, OpenAI API, Node.js, TypeScript, React, Next.js, Nest.js, React Native, PostgreSQL, Supabase, MSSQL, MongoDB, Azure, CI/CD. Send me the brief if you're automating a process or putting AI into a Healthcare or MarTech product, and I'll tell you how I'd approach it. I work hours that overlap the US and Europe, and I do the building myself.

Greetings! I'm an accomplished Full Stack .NET Developer, specializing in leading development projects across web and desktop platforms for over a decade. With experience working with everything from promising startups to high-profile enterprises, I have a proven record of delivering robust, scalable, and efficient solutions to meet the varying needs of the e-commerce, healthcare, insurance, and cryptocurrency industries. In my career, I've not only mastered a diverse set of technologies but also developed the crucial ability to quickly identify and effectively address business needs. I believe in software that not only works flawlessly but is also easy to maintain and scale. I thrive in team environments, fostering collaboration, and driving us towards our shared objectives. I have worked extensively with the following tools and technologies: Languages: C#, Python, SQL, JavaScript/ES6, TypeScript Frontend: React, React Native, Blazor, Angular, Flutter, Tailwind CSS, jQuery, SignalR, Kendo UI, Knockout, Ajax, HTML, CSS, LESS, Bootstrap, ASP.NET, ASP.NET MVC, ASP.NET WebForms, Razor Pages, Telerik Rad Controls Backend: .NET Core, ASP.NET Web API, ASP.NET MVC, FastAPI, Docker, Kubernetes, Elasticsearch, RabbitMQ, NATS DBMS: SQL Server, PostgreSQL, DynamoDB, SQLite, Redis, T-SQL, LINQ, Entity Framework, ADO.NET, Dapper Testing: NUnit, XUnit, MS Test, Moq, Specflow, Selenium Cloud: Azure Portal, Azure DevOps, AWS Desktop: Windows Forms, WCF, P/Invoke Operating Systems: Windows, macOS, Ubuntu Version Control: Git, GitHub, Azure DevOps, Bitbucket, GitLab Reporting: MS Reports, Telerik Reports, DevExpress Tools & technologies: Docker, JIRA, Confluence, FFmpeg, Visual Studio, ReSharper, Visual Studio Code, Rider, WebStorm, DbForge, VirtualBox, VMWare I am eager to bring my technical expertise and leadership skills to your next project, as I'm certain that I can help it meet its objectives and exceed expectations. I'm looking forward to exploring new challenges and how we can navigate them together.

I help entrepreneurs, startups, and businesses build production-ready, secure, high-performance web applications. ✅ Hands-on CTO, leading web platforms used by 100+ investors (over $1.1M USD managed) and 150+ field agents across fintech and public-sector projects. ✅ BSc in Computer Science and 8+ years of experience developing full-stack products from idea to MVP to production. ✅ I combine solid architecture, responsive UI, and clean code to deliver products that scale. What I can do for you: 🌐 Build or migrate your web app using React, Next.js, Remix, and TypeScript ⚙️ Develop secure, scalable full-stack applications 🧠 Architect maintainable, SEO-friendly front-ends 🚀 Deploy, optimize, and ensure high performance 🛡️ Implement authentication, API integrations, and security best practices 📊 Create dashboards and real-time interfaces with modern UI frameworks 🔎 Performance, Security & API Audits Tech stack React • Next.js • Remix • TypeScript • Tailwind • Node.js • PostgreSQL • Docker • Google Cloud • .NET Core • Python • Supabase • Vercel I work across time zones and communicate fluently in English and Spanish. Ready to build? Let’s talk.

I'm a lead software engineer with more than 15 years of experience in development. Having created multiple applications while working alongside a wide range of professionals, I have gained invaluable team-working expertise that I bring with me to every project I embark on. Passionate about modern technologies, I continuously seek to learn and adopt new tools and practices that improve performance, scalability, and developer experience. I thrive in dynamic environments where I can solve complex problems and deliver high-quality, maintainable code.

::::: Project managemet systems ✓ MS Azure Team Services ✓ Jira, YouTrack, GitHub, Trello ✓ GIT ::::: Frontend expert ✓ HTML 5, CSS 3.0 (+adaptive design) ✓ JavaScript, TypeScript ✓ Angular (Angular Material) + RXjs ✓ SignalR, SocketIo, Babylonjs, ThreeJs, PDF.js, PDF-lib, PDF-Assambler, ✓ Firebase / Firestore ✓ jQuery / Lodash / Moment / Bootstrap ✓ UI expert ✓ Google-api (auth, maps, translate, disk...), Yandex-api, Dropbox-api, FB-api, vk-api, Social Newtorks etc. ... ✓ WebPack, Gulp, Grunt ✓ Web Worker ::::: Backend expert: ✓ C# (.NET) ✓ .NET core, .NET freamwork, ASP.NET boilerplate ✓ SQL, T-SQL, azure-sql, azure-storage ✓ Redis, Dapper ✓ Unit testing ::::: DevOps Engineer ✓ Azure ✓ Initiate project ✓ Setup infrastructure ✓ Deployment (TeamCity, Octopus, Visual Studio) ✓ Release Management ✓ Support I do what it takes to complete the goal. Tasks, approaches and even tools, they are always different and developing, so I rarely see the point in remembering something very specific - such as api framework or even language details. When a task is focused and repeated, I make different snippets/helper configs/cheat sheets for increasing speed and orientation. And even if I wanted to forget about something I repeat 100 times a day, I could not. When the project turns up, I unload it from my memory and upload there new data from a new area. I have a little hard-drive, if you catch my drift, but very effective RAM. These qualities help me look at the problem afresh; to check, find and implement the latest technologies and solutions for my projects. Taking into account software development dynamics, this approach seems quite logical. I know and use a lot of things, I realize I can't know everything, and I am open to wide range of proposals, especially for positions with career and personal growth. Multitasking is my strong side, though I also can perform agile and specialized tasks almost like a focused developer. But I easily compensate it with process automation, goal-orienting, perseverance and working from home where I have all the conditions I need and all the time available except sleep. I might have liked to be a narrower specialist, but the clients can't be chosen - they should be provided with a service. ps: I have 3 years + of work experience with Azure services