Kræn Hansen 🇩🇰
@kraenhansen.dk
Software craftsman, interested in local-first software, databases, sync engines and (react) native.
Father of three 👭🏼👶 from Denmark 🇩🇰
Building Developer Experiences @elevenlabs.io
Accepts sponsorships 🐙 https://github.com/sponsors/kraenhansen
Father of three 👭🏼👶 from Denmark 🇩🇰
Building Developer Experiences @elevenlabs.io
Accepts sponsorships 🐙 https://github.com/sponsors/kraenhansen
Pinned
Kræn Hansen 🇩🇰
@kraenhansen.dk
· Jan 5
Today was my first day on the Developer Experience team at @elevenlabs.io - A marked leader in AI voice cloning for text-to-speech, dubbing and voice AI agents.
Tune in to the latest episode of React Universe on Air where @psyche.social and I have a jolly conversation about a mixed bag of topics dear to my heart 💙 #local-first, #ai powered toys for my kids, #hacking my bank, #stoicism and #parenting to name a few 😂
Some of the best tech stories start at home.
Local-first software, security trade-offs, and thoughtful AI discussed through real experience.
New React Universe On Air episode with @psyche.social and Kræn Hansen coming soon. YouTube premiere link below👇
Local-first software, security trade-offs, and thoughtful AI discussed through real experience.
New React Universe On Air episode with @psyche.social and Kræn Hansen coming soon. YouTube premiere link below👇
February 12, 2026 at 6:12 PM
Tune in to the latest episode of React Universe on Air where @psyche.social and I have a jolly conversation about a mixed bag of topics dear to my heart 💙 #local-first, #ai powered toys for my kids, #hacking my bank, #stoicism and #parenting to name a few 😂
Reposted by Kræn Hansen 🇩🇰
React Native 0.84 is now available!
This release makes Hermes V1 the default JavaScript engine and ships precompiled iOS binaries by default — bringing significant performance improvements and faster build times to all React Native apps.
reactnative.dev/blog/2026/0...
This release makes Hermes V1 the default JavaScript engine and ships precompiled iOS binaries by default — bringing significant performance improvements and faster build times to all React Native apps.
reactnative.dev/blog/2026/0...
React Native 0.84 - Hermes V1 by Default · React Native
Today we're excited to release React Native 0.84!
reactnative.dev
February 11, 2026 at 6:09 PM
React Native 0.84 is now available!
This release makes Hermes V1 the default JavaScript engine and ships precompiled iOS binaries by default — bringing significant performance improvements and faster build times to all React Native apps.
reactnative.dev/blog/2026/0...
This release makes Hermes V1 the default JavaScript engine and ships precompiled iOS binaries by default — bringing significant performance improvements and faster build times to all React Native apps.
reactnative.dev/blog/2026/0...
I've put up a few thoughts on ways to improve the DX of linking #Node-API addons into #Xcode projects: github.com/callstackinc...
Please give it a read and comment if you have thoughts or alternative ideas 💙
Please give it a read and comment if you have thoughts or alternative ideas 💙
Improve DX of linking prebuilds · callstackincubator react-native-node-api · Discussion #262
Problem Loading addons via relative paths on Node.js Early on, we had a goal of supporting packages on NPM with existing Node-API addons. Many existing packages use simple names for their library t...
github.com
February 8, 2026 at 3:55 PM
I've put up a few thoughts on ways to improve the DX of linking #Node-API addons into #Xcode projects: github.com/callstackinc...
Please give it a read and comment if you have thoughts or alternative ideas 💙
Please give it a read and comment if you have thoughts or alternative ideas 💙
@elevenlabs.io just announced raising $500M at an $11B valuation to transform how people interact with technology 🎉
Valuation doubling since I signed my contract ... coincidence? I think not 🤔
This place has so much talent and so much potential and I'm really happy to be a part of the journey!
Valuation doubling since I signed my contract ... coincidence? I think not 🤔
This place has so much talent and so much potential and I'm really happy to be a part of the journey!
February 4, 2026 at 2:30 PM
@elevenlabs.io just announced raising $500M at an $11B valuation to transform how people interact with technology 🎉
Valuation doubling since I signed my contract ... coincidence? I think not 🤔
This place has so much talent and so much potential and I'm really happy to be a part of the journey!
Valuation doubling since I signed my contract ... coincidence? I think not 🤔
This place has so much talent and so much potential and I'm really happy to be a part of the journey!
Learning a new language 😊
February 4, 2026 at 1:53 PM
Learning a new language 😊
First to like @reactnative.dev on @npmx.dev 💙
February 4, 2026 at 6:13 AM
First to like @reactnative.dev on @npmx.dev 💙
Reposted by Kræn Hansen 🇩🇰
@kraenhansen.dk doing #rust @reactnative.dev talk for @rust-cph.mastodon.social.ap.brid.gy meetup at veo.co
January 29, 2026 at 5:29 PM
@kraenhansen.dk doing #rust @reactnative.dev talk for @rust-cph.mastodon.social.ap.brid.gy meetup at veo.co
@joodaloop.com I love how you share ideas on the "workbench" section of your website 💙 I think I might have to copy that idea for my own website 🙂
January 28, 2026 at 7:01 AM
@joodaloop.com I love how you share ideas on the "workbench" section of your website 💙 I think I might have to copy that idea for my own website 🙂
Very relatable! The maintainer of the #Hermes engine is looking forward to Node-API support landing: A major milestone on the journey of adding Node-API to #ReactNative 💙
Lots of kudos and energy goes out to the team at @microsoft.com and Vladimir Morozov in particular!
github.com/facebook/her...
Lots of kudos and energy goes out to the team at @microsoft.com and Vladimir Morozov in particular!
github.com/facebook/her...
January 15, 2026 at 10:16 AM
Very relatable! The maintainer of the #Hermes engine is looking forward to Node-API support landing: A major milestone on the journey of adding Node-API to #ReactNative 💙
Lots of kudos and energy goes out to the team at @microsoft.com and Vladimir Morozov in particular!
github.com/facebook/her...
Lots of kudos and energy goes out to the team at @microsoft.com and Vladimir Morozov in particular!
github.com/facebook/her...
Today was my first day on the Developer Experience team at @elevenlabs.io - A marked leader in AI voice cloning for text-to-speech, dubbing and voice AI agents.
January 5, 2026 at 8:18 PM
Today was my first day on the Developer Experience team at @elevenlabs.io - A marked leader in AI voice cloning for text-to-speech, dubbing and voice AI agents.
Reposted by Kræn Hansen 🇩🇰
Hello #Local-First enthusiat, We have great news to share with you! @fosdem.org '26 wil be hosting a full devroom dedicated entirely to local first software. We have gathered the best lineup ever, all the major open source projects will be presenting! Come and join us, it is free! openlocalfirst.org
Open Local First
For the first time this year, the FOSDEM conference will host a devroom for Local First, CRDTs and sync protocols and sync engines. FOSDEM is the biggest Free and Open Source conference in Europe. Thi...
openlocalfirst.org
December 22, 2025 at 9:34 PM
Hello #Local-First enthusiat, We have great news to share with you! @fosdem.org '26 wil be hosting a full devroom dedicated entirely to local first software. We have gathered the best lineup ever, all the major open source projects will be presenting! Come and join us, it is free! openlocalfirst.org
Reposted by Kræn Hansen 🇩🇰
Hello #Local-First enthusiat, We have great news to share with you! @fosdem.org'26 will be hosting a full devroom dedicated entirely to local first software. We have gathered the best lineup ever, all the major open source projects will be presenting! Come and join us, it is free! openlocalfirst.org
Open Local First
For the first time this year, the FOSDEM conference will host a devroom for Local First, CRDTs and sync protocols and sync engines. FOSDEM is the biggest Free and Open Source conference in Europe. Thi...
openlocalfirst.org
December 23, 2025 at 7:48 AM
Hello #Local-First enthusiat, We have great news to share with you! @fosdem.org'26 will be hosting a full devroom dedicated entirely to local first software. We have gathered the best lineup ever, all the major open source projects will be presenting! Come and join us, it is free! openlocalfirst.org
TL;DR I've decided to leave my job at MongoDB 🍃
December 11, 2025 at 7:01 PM
TL;DR I've decided to leave my job at MongoDB 🍃
It's time to wrap up this year - what better way than filling out the State of React Native survey from @swmansion.com? survey.2025.stateofreactnative.com
State of React Native 2025
Participate in the State of React Native survey to share your insights.
survey.2025.stateofreactnative.com
December 8, 2025 at 7:47 AM
It's time to wrap up this year - what better way than filling out the State of React Native survey from @swmansion.com? survey.2025.stateofreactnative.com
Reposted by Kræn Hansen 🇩🇰
Node-API for React Native wasn't built in a weekend. Khalef Hosany (Microsoft) & @kraenhansen.dk (MongoDB) detail the community effort, from a Windows-specific prototype to a public standard. They discuss "nerd sniping" & why they need your feedback now ➡️ youtu.be/TN4ENNf31vs
Building Node-API for React Native With Khalef Hosany & Kræn Hansen
YouTube video by Callstack
youtu.be
November 20, 2025 at 1:08 PM
Node-API for React Native wasn't built in a weekend. Khalef Hosany (Microsoft) & @kraenhansen.dk (MongoDB) detail the community effort, from a Windows-specific prototype to a public standard. They discuss "nerd sniping" & why they need your feedback now ➡️ youtu.be/TN4ENNf31vs
Reposted by Kræn Hansen 🇩🇰
🤔 What if there were a conference without talks? Just hanging out with OSS maintainers & builders, seeing what they’re working on, and learning cool stuff by actually talking to people.
🤯 What if hallway track turned into the whole event!
💡 @tannerlinsley.com is exploring it. Interested? ⬇️
🤯 What if hallway track turned into the whole event!
💡 @tannerlinsley.com is exploring it. Interested? ⬇️
Web Forge Conf - A new kind of web developer conference
A community funded, not for profit event built for creators and the developers who use their work. Less stage. More story. All signal.
webforgeconf.com
November 13, 2025 at 9:36 AM
🤔 What if there were a conference without talks? Just hanging out with OSS maintainers & builders, seeing what they’re working on, and learning cool stuff by actually talking to people.
🤯 What if hallway track turned into the whole event!
💡 @tannerlinsley.com is exploring it. Interested? ⬇️
🤯 What if hallway track turned into the whole event!
💡 @tannerlinsley.com is exploring it. Interested? ⬇️
@schickling.dev good luck with the conference tomorrow! I'm looking forward to the videos 🤞 (and next year's local-first conf? 🙏😅)
November 11, 2025 at 10:02 PM
@schickling.dev good luck with the conference tomorrow! I'm looking forward to the videos 🤞 (and next year's local-first conf? 🙏😅)
Admittedly - suuuper niece and specific request:
How would you coordinate multiple JS engines implementing Node-API running in the same process?
Here's my take github.com/callstackinc..., wrapping opaque pointers in objects referencing a struct of function pointers to use.
Feedback is appreciated!
How would you coordinate multiple JS engines implementing Node-API running in the same process?
Here's my take github.com/callstackinc..., wrapping opaque pointers in objects referencing a struct of function pointers to use.
Feedback is appreciated!
Enable multiple Node-API hosting JS engines / runtimes to share the global Node-API functions by kraenhansen · Pull Request #329 · callstackincubator/react-native-node-api
Stacked on #328.
This is my suggestion for adding "multi-host" support to weak-node-api, enabling multiple engines implementing Node-API to co-exist and share the Node-API function namesp...
github.com
November 10, 2025 at 10:16 PM
Admittedly - suuuper niece and specific request:
How would you coordinate multiple JS engines implementing Node-API running in the same process?
Here's my take github.com/callstackinc..., wrapping opaque pointers in objects referencing a struct of function pointers to use.
Feedback is appreciated!
How would you coordinate multiple JS engines implementing Node-API running in the same process?
Here's my take github.com/callstackinc..., wrapping opaque pointers in objects referencing a struct of function pointers to use.
Feedback is appreciated!
Reposted by Kræn Hansen 🇩🇰
Hi, I’m Alex goldman. I used to host a podcast called Reply All that some people liked. For the past year I have been making a show called @hyperfixedpod.bsky.social. We now have 25 episodes (50 if you count premium episodes). You might enjoy it! Listen if you liked reply all
November 1, 2025 at 6:36 PM
Hi, I’m Alex goldman. I used to host a podcast called Reply All that some people liked. For the past year I have been making a show called @hyperfixedpod.bsky.social. We now have 25 episodes (50 if you count premium episodes). You might enjoy it! Listen if you liked reply all
I have huge (no longer secret) nerd-crush on this guy 🤓
Josh is a great fellow, hire him - 'nuff said ...
Josh is a great fellow, hire him - 'nuff said ...
I am looking for a full-time job.
Being independent in open source for 3.5+ years has been wonderful. I've gotten done most of the high-level goals I wanted to, and miss having people & structure around me.
If you know of a role for a staff-level TypeScript+web developer, let me know! 🙂
Being independent in open source for 3.5+ years has been wonderful. I've gotten done most of the high-level goals I wanted to, and miss having people & structure around me.
If you know of a role for a staff-level TypeScript+web developer, let me know! 🙂
October 30, 2025 at 4:26 PM
I have huge (no longer secret) nerd-crush on this guy 🤓
Josh is a great fellow, hire him - 'nuff said ...
Josh is a great fellow, hire him - 'nuff said ...
Shipping a prebuilt Xcframework on #npm is harder than it should be.
It may contain internal symbolic links when it wraps a versioned MacOS framework. These are stripped from the archive uploaded to the registry, meaning it's broken when downloaded again 🫠
It may contain internal symbolic links when it wraps a versioned MacOS framework. These are stripped from the archive uploaded to the registry, meaning it's broken when downloaded again 🫠
October 30, 2025 at 7:08 AM
Shipping a prebuilt Xcframework on #npm is harder than it should be.
It may contain internal symbolic links when it wraps a versioned MacOS framework. These are stripped from the archive uploaded to the registry, meaning it's broken when downloaded again 🫠
It may contain internal symbolic links when it wraps a versioned MacOS framework. These are stripped from the archive uploaded to the registry, meaning it's broken when downloaded again 🫠
Please don't get me wrong here 🙏
Let's just say I find it curious when four female devs (three of which have AI altered pics) and none have their workplace listed, starts following me the same day 😬
Let's just say I find it curious when four female devs (three of which have AI altered pics) and none have their workplace listed, starts following me the same day 😬
October 30, 2025 at 7:00 AM
Please don't get me wrong here 🙏
Let's just say I find it curious when four female devs (three of which have AI altered pics) and none have their workplace listed, starts following me the same day 😬
Let's just say I find it curious when four female devs (three of which have AI altered pics) and none have their workplace listed, starts following me the same day 😬
This years @reactuniverseconf.com was awesome! In particular my conversation with @psyche.social and Khalef Hosany (from @microsoft.com) about @nodejs.org #Node-API support in @reactnative.dev 💚
We also touched on what it take to build an #opensource community and use of AI 🤖
youtu.be/TN4ENNf31vs
We also touched on what it take to build an #opensource community and use of AI 🤖
youtu.be/TN4ENNf31vs
Building Node-API for React Native With Khalef Hosany & Kræn Hansen
YouTube video by Callstack
youtu.be
October 29, 2025 at 8:25 AM
This years @reactuniverseconf.com was awesome! In particular my conversation with @psyche.social and Khalef Hosany (from @microsoft.com) about @nodejs.org #Node-API support in @reactnative.dev 💚
We also touched on what it take to build an #opensource community and use of AI 🤖
youtu.be/TN4ENNf31vs
We also touched on what it take to build an #opensource community and use of AI 🤖
youtu.be/TN4ENNf31vs