--- title: "About Tore Nestenius | .NET MVP, Consultant and Trainer" description: ".NET consultant and trainer specializing in identity and web security in .NET. Microsoft .NET MVP. Highlights from my journey, from a VIC-20 to today." url: https://nestenius.se/about/ type: page lang: en site: https://nestenius.se/ --- # About Tore Nestenius | .NET MVP, Consultant and Trainer I'm Tore Nestenius, a .NET consultant and trainer based in Göteborg, Sweden. Sharing knowledge is a big part of who I am: building a course is how I learn a topic properly, because you don't really know something until you can explain it to others. **My focus areas** - .NET - Identity - Web security - Software architecture - Event sourcing - Agentic development - Training ![Tore Nestenius speaking on stage at NDC Copenhagen](https://nestenius.se/_astro/tore-speaking-ndc-copenhagen-square.CSzV4arF_uONN8.webp) **At a glance** - Senior .NET developer and architect, working as a consultant - [Microsoft .NET MVP](https://mvp.microsoft.com/en-US/mvp/profile/5150f7cb-54d8-48d8-a450-46b2b677d634) - Author of [Dometrain video courses](https://nestenius.se/about/#my-dometrain-video-courses) on ASP.NET Core authentication and OpenID Connect - Professional trainer for companies since 2010, teaching [courses](https://tn-data.se/courses/) I have created myself - Conference and user group speaker - Co-organizer of the [.NET Skåne](https://www.meetup.com/net-skane/) user group, with more than 500 members ![Microsoft Most Valuable Professional (MVP) logo](https://nestenius.se/_astro/microsoft-mvp-logo.CGple42E_Z1PXQUg.webp) ## My Dometrain video courses [Dometrain](https://dometrain.com/) is an online learning platform for software engineers, focused on .NET and C#. I have created these courses: - **[Getting Started: Authentication and Authorization in .NET](https://dometrain.com/course/getting-started-authentication-and-authorization-in-dotnet/)**: a 12-hour course covering both the foundations and the practical implementation of authentication and authorization in ASP.NET Core. - **[Getting Started: OpenID Connect](https://dometrain.com/course/getting-started-openid-connect/)**: a 10-hour course on how OAuth 2 and OpenID Connect work under the hood: tokens, signing, the flows and PKCE, so you understand what happens before you configure it in ASP.NET Core. You can find all my courses on [my Dometrain author page](https://dometrain.com/author/tore-nestenius/). [![Getting Started: OpenID Connect, a Dometrain course by Tore Nestenius](https://nestenius.se/_astro/getting-started-openid-connect-thumbnail.BKepI2R0_Z10O631.webp)](https://dometrain.com/course/getting-started-openid-connect/) [![Getting Started: Authentication and Authorization in .NET, a Dometrain course by Tore Nestenius](https://nestenius.se/_astro/getting-started-authentication-and-authorization-in-dotnet-thumbnail.CZ0_PMy1_Z2lFmgK.webp)](https://dometrain.com/course/getting-started-authentication-and-authorization-in-dotnet/) ## Highlights from my journey ### It started with a VIC-20 My first computer was a Commodore VIC-20. I was so hooked on programming that I took evening classes in BASIC at age 11, as the only kid in the class. I even ended up in the local newspaper, coding at a computer exhibition together with my programming teacher. ![Newspaper clipping of a young Tore showing his skills at a computer exhibition](https://nestenius.se/_astro/rore_12yr.B_v8baEx_1cpg0x.webp) ### The Atari ST demo scene With friends I co-founded the Swedish Atari ST demo group [Sync](https://demozoo.org/groups/2256/), part of the [demo scene](https://en.wikipedia.org/wiki/Demoscene). We wrote demos, programs that show off graphics, music and code in real time, and competed with other groups to get the most out of the machine. I was a coder, and everything we did was written in low-level Motorola 68000 assembly language, straight to the hardware. I also started a side-scrolling game in the style of *Scramble*, in 100% assembly, which I never finished. ![Screenshot of the Sync STE Demo on the Atari ST](https://nestenius.se/_astro/sync-ste-demo.DuAu8A-e_21feCc.png) ![Screenshot of an unfinished side-scrolling game on the Atari ST](https://nestenius.se/_astro/atari-st-unfinished-game.DMXuRd3j_ZVeB0B.png) ### Audio Sculpture I co-authored [Audio Sculpture](https://www.youtube.com/watch?v=0C4fIeC749Y), a sound tracker for composing, editing and playing music on the Atari ST, written in 100% 68000 assembly. ![Screenshot of the Audio Sculpture sound tracker on the Atari ST](https://nestenius.se/_astro/tore_atari.DeUQUfLf_kEkPG.webp) ### My own Sega Mega Drive dev kit I wanted to write my own games, and the ultimate challenge was to write games for game consoles. I couldn't afford an official dev kit, and there was no documentation, so I reverse-engineered the Sega Mega Drive and built my own kit, programmed from my Atari ST. I think of it as one of my biggest accomplishments. The full story is in [How I built my own Sega Mega Drive hardware dev kit from scratch](https://nestenius.se/hardware/how-i-built-my-own-sega-mega-drive-hardware-dev-kit-from-scratch/). ![Tore's home-built Sega Mega Drive dev kit next to the console](https://nestenius.se/_astro/sega-mega-drive-dev-kit.C1ilJc_o_Z1jFdrd.webp) ### The Programmers Heaven CD-ROMs I turned my big collection of programming files into two CD-ROMs called *Programmers Heaven*, with more than 12,000 pieces of source code, tutorials and tools. ![The two Programmers Heaven CD-ROMs](https://nestenius.se/_astro/tore_cdrom._fuh_04i_FsnOb.webp) ![Cover of the first Programmers Heaven CD-ROM](https://nestenius.se/_astro/programmers-heaven-cd-rom-1.EKBDcJhL_Z1P6ynl.webp) ![Cover of Programmers Heaven 2](https://nestenius.se/_astro/programmers-heaven-cd-rom-2.DnRn2O_T_Z129g6u.webp) ### Programmers Heaven The CD-ROMs became the start of the Programmers Heaven website, a developer community that reached more than 750,000 monthly visitors at its peak. I ran it full time for over eight years, and it gave me broad experience in development, operations, administration, SEO, marketing and sales. ![The Programmers Heaven home page in 2008](https://nestenius.se/_astro/programmers-heaven-2008.DLUxv6_p_Z1fRaNJ.webp) ### CodePedia When I learned about the wonderful concept of [wikis](https://en.wikipedia.org/wiki/Wiki), I decided to build my own wiki website for developers. CodePedia ran on my own wiki engine, and anyone could add content to it. ### C# School I published [C# School](https://tn-data.se/downloads/csharp-school-ebook.pdf), a free ebook for beginners who want to learn C# and .NET. Its 16 chapters and 338 pages take the reader from the fundamentals and object-oriented programming to real-world topics like collections, delegates, data access and threads. ![Cover of the C# School ebook](https://nestenius.se/_astro/csharp-school-ebook.DL8aZ1jO_Z1Itlbz.webp) ### Co-founding Edument From 2010 to 2021 I was co-founder and CTO of [Edument](https://www.edument.se/), a training and consulting company that grew to about 35 employees and five offices. It is where I got into the training business, and eventually became a trainer myself. I created and taught courses on C#, ASP.NET Core, web security, IdentityServer, architecture and Azure, for development teams in Sweden and abroad, and I still teach today. ![Tore presenting a slide about infrastructure as code](https://nestenius.se/_astro/tore_about_me.CHZwWxtc_1mlb7.webp) ### cqrs.nu In 2011 I attended one of Greg Young's early online workshops on CQRS and event sourcing, and I was hooked on these patterns. To give back to the community, we at Edument created [cqrs.nu](https://cqrs.nu/): a free guide to both patterns, with a [starter kit](https://github.com/edumentab/cqrs-starter-kit) for building and testing event-sourced systems. We also created training courses on the topic. ### Co-founding .NET Skåne In 2024 I co-founded [.NET Skåne](https://www.meetup.com/net-skane/), a user group for .NET developers in southern Sweden that now has more than 500 members. ![.NET Skåne logo](https://nestenius.se/_astro/dotnet-skane-logo.B4c3kQyq_21VECE.webp) ### Microsoft .NET MVP In 2024 I received my first Microsoft .NET MVP award. It is a recognition of my community work and of sharing knowledge, it has opened new opportunities for me, and it is something I am very proud of. ![Microsoft Most Valuable Professional (MVP) logo](https://nestenius.se/_astro/microsoft-mvp-logo.CGple42E_Z1PXQUg.webp) ## Open source Two open-source projects I created and maintain: - **[CloudDebugger](https://github.com/tndata/CloudDebugger)**: a teaching and exploration tool for Azure cloud developers. - **[Coding Agent Explorer](https://github.com/tndata/CodingAgentExplorer)**: a real-time .NET proxy and dashboard for inspecting AI coding agent API calls. ## What to explore next? If you want to know more about my work, here is where to go: - **Need help with identity or security?** [Consulting](https://tn-data.se/consulting/) - **Training for your team?** [Training](https://tn-data.se/training/) - **Looking for a speaker?** [Talks](https://tn-data.se/talks/) - **Learning on your own?** [My Dometrain courses](https://dometrain.com/author/tore-nestenius/) Or just say hello, through [the contact page](https://nestenius.se/contact/) or on [LinkedIn](https://www.linkedin.com/in/torenestenius/).