Streaming worldwide 8 9 October 2025Have you cracked a performance bottleneck?Built something clever with AI agents?Discovered a design pattern the .NET world should know?Share it with thousands of developers at JetBrains .NET Days Online 2025 a free, community-driven event broadcast live around the globe.Submit your talk on Sessionize TL;DRLive sessions in English, 30 / 45 / 60 min + optional 510 min Q&A.We schedule slots that fit your time zone.CFP runs 14 July 15 August 2025 (one month).All accepted speakers receive a 1-year JetBrains All-Products Pack.First-timers welcome well review slides and run rehearsals.Need a JetBrains tool for your demo? Ask us for a free trial license.Read our Code of Conduct before submitting.Key datesCFP deadline: 15 August 2025 (23:59 UTC) get your proposal in!Live event: 8 9 October 2025.What type of talks are we looking for?Anything that pushes .NET forward. Popular areas include:Architecture & Design clean code, DDD, modular monoliths, event-driven patterns.Performance & Diagnostics profiling, benchmarking, memory tuning.Cloud-native .NET containers, Aspire, serverless, observability best practices.AI & Machine Learning OpenAI, Semantic Kernel, ML.NET in production.Language Deep-dives new C#/F# features, Roslyn tricks, source generators.Web & UI Blazor, ASP.NET Core, Avalonia, MAUI, WASM.Data & Persistence EF Core, Dapper, NoSQL patterns, caching strategies.Testing & Quality property-based testing, mutation testing, resilient pipelines.or anything else that helps the .NET community learn and ship better software.Need inspiration? Sample session ideas from past eventsImmutable collections in .NETDecoupling via Async Message PumpsFormatting C# codeTaming DI by designing your own containerError-log telemetry: an end-to-end approachInner-Outer Clean-up: what and how?New speaker? No problem!We love fresh voices. Our advocacy team will:Review your slides and abstract.Run a private rehearsal and give feedback.Help you feel confident on the (virtual) stage.JetBrains .NET Days Online 2025 FAQ> I dont own a JetBrains license can I still show the tools?Yes. If youd like to demo Rider, ReSharper, or any other JetBrains product, just ask for a free trial when you submit. But remember: using JetBrains tools is optional.> Do you cover other dev topics?If its useful to .NET developers, pitch it we read every submission.> How many submissions can I send?Up to three per speaker. Focus each abstract on one clear idea.Ready to share your story?Outline your idea on Sessionize and hit Submit it takes only a few minutes.Know someone who should be on stage? Please share this link!Propose a talk nowQuestions? Email matt.ellis@jetbrains.com.