The main conference of .NET DeveloperDays 2026 takes place on October 20-21, 2026 (Tuesday–Wednesday), with the optional full-day pre-conference sessions taking place on October 19 (Monday), and two-day post-conference sessions taking place over two days – October 22–23 (Thursday-Friday).

.NET DeveloperDays will be carried out in EXPO XXI in Warsaw, at Prądzyńskiego 12/14. Visit the venue page for more information about it.

The main topic of the event is software development using .NET. At the conference, you will hear about programming languages, technologies, tools, and practical problems that every person working with .NET can encounter these days.
Topics of sessions include C#, F#, Visual Studio, ASP.NET, MAUI, architecture, project management, and all the related stuff. The full agenda will be available at August 2026.

The official conference language is English. All the conference sessions will be presented in English.

No, conference sessions do not require additional enrollment. However, if you are registered for one of the training sessions on October 19 or October 22–23, you will be assigned to that session. Changes to the full-day training session you are registered for are possible no later than 14 days before the event. If you would like to change your workshop, please contact us via e-mail.

The electronic ticket, that you problably received on your e-mail inbox, is the confirmation of participation in the event. If you lost it, don’t panic – we’ll send tickets to all attendees the few days before the event. Even if you were absent at the list of attendees, you would take part in the event after quick payment at the service desk.

Since the place of service delivery is in Poland, we have to charge VAT on top of the net amount and the “reverse charge” scheme does not apply in this case (it’s different from the export of services or goods to another EU country). You can, however, reclaim the paid VAT from Polish tax authorities under EU VAT return scheme. More on that here: http://europa.eu/youreurope/business/vat-customs/refund/index_en.htm.

According to point IV.8 of the Regulations available at registration system, we don’t send paper invoices. According to Polish law, unsigned invoice has the same importance as signed – thus, in order to get paper invoice, it’s enough to print the electronic version of it.

Yes, you can inform us after registration via e-mail (info@developerdays.eu) that you want to change your pre-con/post-con session to the different one. The deadline for such changes is October 5, 2026.

Warsaw is easily accessible from other European cities, within Poland as well as from numerous foreign locations. Warsaw has two major airports: Okęcie Airport which serves traditional airlines flying to a huge number of destinations within Europe, and Modlin Airport (located 35km from the city center) which serves low-cost airlines flying mainly to destinations in Western Europe.

Our venue offers a cloakroom available all day.

Yes, there is a paid parking lot at the venue.

Yes, we will have a WiFi available for the conference attendees.

Please log in to your account in registration system and click the “Edit registration” button. Make all necessary changes, next click “Save” and confirm. Both you and new Partcipant will receive the e-mail confirmation. Prepare the following information:

– first name, last name (of new participant)
– email address
– t-shirt size
– participation in conference party (no/alone/with accompanying person)
– current job position
– job experience

Alternatively, you may contact us via e-mail, and we will make the participant change in the system on your behalf.

Yes – the registration desk is going to be open almost all day – till 5 PM.

Sure! As soon as you register and pay for your participation in the conference, contact us and we will prepare a visa invitation letter for you. After registration and payment, please contact us for your visa invitation letter. We will need your full name, date of birth, nationality and passport number. In the unlikely case that your visa application was refused, we would refund your conference fee in full (this procedure requires a consulate statement denying visa).