Software Engineer @Apple (Tools&Frameworks)
Joined June 2010
- Tweets 110
- Following 182
- Followers 378
- Likes 175
8 Photos and videos
Jun 8
Proud to share a feature we've been working hard on! In Xcode 27.0, Agentic Xcode can automatically find runtime bugs for you. After a code change, it installs the app in a simulator, navigates your UI, observes the screen and validates that the feature works flawlessly ... (1/2)
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Jun 8
... Just request to validate that in runtime as part of your prompt.
Plus, this is exposed as a skill with MCP tools, so you can invoke the exact same flow from your CLI agents of choice.
Let us know what you think! (2/2)
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Bartosz Polaczyk retweeted
Feb 3
Xcode now supports coding agents from Anthropic and OpenAI š
apple.com/newsroom/2026/02/xā¦
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Bartosz Polaczyk retweeted
9 Sep 2025
šŗiPhone models announced today include Memory Integrity Enforcement, the culmination of an unprecedented design and engineering effort that we believe represents the most significant upgrade to memory safety in the history of consumer operating systems. security.apple.com/blog/memoā¦
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Bartosz Polaczyk retweeted
14 Aug 2025
š¤ What happens when your AI chatbot knows everything your engineering org knows? Way faster answers on everything from corporate policies to internal APIs and more. š§ Listen: hubs.ly/Q03CMkq80
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10 Jun 2025
Instruments' CPU Bottlenecks and Processor Traces are truly game changers for code optimization:
developer.apple.com/videos/pā¦ #wwdc2025
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10 Jun 2025
If you want to learn how to speed up your UI test authoring in Xcode 26 using recording , watch "Record, replay, and review" session by @MaxHarlynking developer.apple.com/videos/pā¦
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Bartosz Polaczyk retweeted
1 Feb 2025
Open sourcing Xcode's build engine -- introducing swift-build: swift.org/blog/the-next-chapā¦
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Bartosz Polaczyk retweeted
8 Nov 2024
š Help millions of developers build faster apps at Apple!
Iām hiring Performance Tools Engineers to develop Xcode Instruments and create next-generation profiling tools and visualizations targeting all Apple platforms.
š Location: Cupertino
š ļø Tech: Swift, Objective-C, SwiftUI, AppKit
Apply: jobs.apple.com/en-us/detailsā¦
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Bartosz Polaczyk retweeted
13 Feb 2024
My SwiftConf 2023 talk about App Size @ Spotify is on YouTube now! youtube.com/watch?v=v3rYaEXzā¦ #iosdev #swiftlang
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25 Sep 2023
Open-sourcing XCBuildAnalyzer, a macOS app to visualize Xcode build system graph.
Details are available at Inspecting Xcodeās build system graph at ease: link.medium.com/zL8UB8G5mDb
The tool is still in an experimental phase but should be functional already.
github.com/polac24/XCBuildAnā¦
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Bartosz Polaczyk retweeted
9 Nov 2022
Apple is so incredibly bad at explaining these genius little things
8 Nov 2022
Just accidentally discovered that macOS Calculator has a āPaper Tapeā window you can activate with ā-T
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Bartosz Polaczyk retweeted
4 Nov 2022
If anybody affected by the layoffs is interested, my team at Square is looking for an engineering manager for the Android Foundation team (core frameworks used to build all of our apps) and a product manager for our core mobile projects. jonm at squareup dot com to connect.
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22 Jun 2022
Even Xcode 14b1 doesn't contain watchOS or tvOS runtime by default, you can manually download dmg and place its content in Xcode's Developer/Platforms/WatchOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/watchOS.simruntime. Useful on CI to not pollute home directory
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22 Jun 2022
Context: if you install it manually from UI or a script `xcrun simctl runtime add ...`, a runtime will be placed at /Library/Developer/CoreSimulator/Volumes/
30 May 2022
I open-sourced a tool to merge several Xcode .dia files into a single file. Could be useful in a Bazel-Xcode integration - multiple per-source-file .dias generated by compilers in a Bazel build can be exposed to Xcode from a single "fake" compilation step: github.com/polac24/dia-merge
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16 Nov 2021
I am excited to announce that the project I have been involved is now open source. XCRemoteCache speeds up building iOS apps. Results are impressing, clean builds are down by 70% for the Spotify app.
16 Nov 2021
A 70% decrease in clean build times š¤Æ. Thatās what XCRemoteCache does for our iOS projects ā and itās what it can do for yours too.
Learn more about it on our blog: engineering.atspotify.com/20ā¦
#opensource
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Bartosz Polaczyk retweeted
22 Oct 2021
We're so proud to be named America's Most Loved Workplace by @Newsweek, and even prouder of the people and teams that make our band one of a kind. Fika, anyone? #jointheband
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