Jan Sebastián Kostlán

About Me

My name is Jan Sebastián Kostlán, and I focus primarily on web development, programming, web design, and SEO. I enjoy finding the connection between technical solutions and real-world results. I create fast, accessible, and secure websites, develop games and apps, and manage online marketing to ensure projects aren't just good-looking, but also visible and effective.

In practice, I work with .NET/ASP.NET Core and modern frontend technologies. I enjoy automating deployments using Docker and CI/CD, and ensuring quality—from Core Web Vitals to accessibility. Thanks to my experience with SEO and data analysis, I can design website content and structure for the best search engine performance.

I also have specific areas of interest that I actively pursue. Chief among these is game development in Unity—from small prototypes to multiplayer projects. I care about clean architecture, great user experience, and ensuring that every app or game has measurable value.

In my free time, I focus on fitness and strength training, which helps me balance computer work and motivates me to push my boundaries. Just like in IT, I enjoy tracking my progress in sports and finding ways to be one step further every day.

My goal is to leave a mark in every field I enjoy—from websites and apps, to games and SEO, to personal growth. I want to build things that hold long-term value and prove that the combination of technology, creativity, and perseverance can push boundaries.

Want to see what I'm working on right now? Check out my projects or read my blog. If you're interested in collaborating on a website, game, or need SEO consultation, reach out via contact. I'd love to discuss your idea and propose a solution.