Sebastien Ros
sebastienros.me
Sebastien Ros
@sebastienros.me
Developer on the ASP.NET team at Microsoft working on Performance and Aspire. Maintainer of some .NET open source projects like Orchard Core, Jint, Fluid, Parlot, YesSql, ...
I'll be in Prague next week between November 10th and 12th for the Orchard Conference. Maybe I'll see you there!
November 7, 2025 at 4:20 AM
PC was randomly crashing and felt hot on touch. I think I found the reason ... this is where the fan pushes the hot air through, or was trying to.
November 3, 2025 at 7:01 PM
Reposted by Sebastien Ros
Registration for the Orchard Harvest 2025 conference is open. It will be held in Prague, on Nov. 11 & 12, 2025. Find more about tickets, speaker opportunities, and programs at hubs.ly/Q03M1z2G0
#OrchardHarvest2025
October 6, 2025 at 12:52 PM
Reposted by Sebastien Ros
accepting AI PRs from Sebastien is such an insult. It's like Picasso sending me a Hallmark birthday card.
September 12, 2025 at 5:32 PM
At the rate of spam calls I am receiving I should have all existing phone numbers blocked by next year.
April 24, 2025 at 6:19 PM
I have a cool demo for work but it's Friday and nobody's there anymore to see it, bummer ;)
March 1, 2025 at 1:53 AM
New adult me achievement: paid off house mortgage.
February 8, 2025 at 12:21 AM
Not driving today, let's walk to the pool...
February 5, 2025 at 3:02 PM
I attempted to convert Fluid to use TUnit instead of XUnit with the help of Copilot Edits (a new feature in VS editors). I didn't find many benefits so I will stick to XUnit for now.
February 2, 2025 at 12:59 AM
Up for grabs, JavaScript Temporal API in Jint. Should be fun to implement and date/time management work is a great learning experience.

github.com/sebastienros...
Temporal API · Issue #2018 · sebastienros/jint
Given that Temporal is as stage 3 proposal now, and ECMAScript engine implementers are currently working to implement it1. It would be very nice if we could work on that in Jint too. As a starting ...
github.com
January 30, 2025 at 4:40 PM
As I am writing a unit test to verify a fix for Copilot, VS Copilot just spits out the multi-threading code I had in ming for it. Just based on the variable names and values I populated.
January 14, 2025 at 11:15 PM
Last night the GitHub 'ubuntu-latest' runners went from Ubuntu 22.04.5 to 24.04.1. Discovered it as some dotnet tests are now failing due to differences in default date time formats. An example is the long Date/Time format "F" is using a non-breakable space before AM/PM where it used to be a space.
January 7, 2025 at 6:11 PM
The bread at Costco went from $5.99 to $6.99. I may have to ask for a raise because that will impact my budget greatly. #breadislife
January 5, 2025 at 12:53 AM
Filed a support ticket for a popular bike computer showing how it miscalculates dates due to timezones. Synching after 4pm Pacific does not show today's workouts, but only the ones for the next day. And 4pm Pacific is 12am UTC the day after. Even recorded a vid at exactly 4pm as a repro.
December 25, 2024 at 1:02 AM
Reposted by Sebastien Ros
JS Engine Switcher 3.27.3 released: Added support for new versions of the ChakraCore, Jint, Jurassic and YantraJS
Release v3.27.3 · Taritsyn/JavaScriptEngineSwitcher
Version: 3.27.3 Published: 12/18/2024 Change Set: 195b8fb In JavaScriptEngineSwitcher.ChakraCore added support for the ChakraCore version of August 1, 2024 In JavaScriptEngineSwitcher.Jint added s...
github.com
December 18, 2024 at 5:56 PM
Being inclusive as a developer also means supporting PMs who once in a while try to code, like @blowdart.me
November 28, 2024 at 2:33 AM
@haacked.com wrt to quantum, would suggest you keep your own router (not their 360 wifi) and use bridge mode (admin access to the modem). Has been flawless for me since then. Couldn't open their app for 4 months to configure the access points.
November 26, 2024 at 2:20 PM
I added more usages of SearchValues in Parlot (a dotnet parser combinator) and filed a few related issues for improvements github.com/sebastienros...
Issues · sebastienros/parlot
Fast and lightweight parser creation tools. Contribute to sebastienros/parlot development by creating an account on GitHub.
github.com
November 19, 2024 at 5:00 PM
Already learned something while watching the dotnetconf keynote: we can now hide the Windows system tray date and time which is very useful when recording demos.
November 12, 2024 at 4:52 PM