Frank van Puffelen
@puf.io
People + Tech = 🎉
🇳🇱 NL born, 🌁 SF based
Currently: FlutterFlow 💜
Previously: Firebase & Flutter @ Google 🔥💙
🇳🇱 NL born, 🌁 SF based
Currently: FlutterFlow 💜
Previously: Firebase & Flutter @ Google 🔥💙
🏜️🦈 Large sculptures keep appearing at more places in San Francisco, and I love it! 😍
This is Desert Shark, originally made for Burning Man in 2022, but just now landed at Pier 45 on Embarcadero, right in from of Musée Mécanique.
More on: puf.io/socials/2025-...
This is Desert Shark, originally made for Burning Man in 2022, but just now landed at Pier 45 on Embarcadero, right in from of Musée Mécanique.
More on: puf.io/socials/2025-...
December 15, 2025 at 4:19 PM
🏜️🦈 Large sculptures keep appearing at more places in San Francisco, and I love it! 😍
This is Desert Shark, originally made for Burning Man in 2022, but just now landed at Pier 45 on Embarcadero, right in from of Musée Mécanique.
More on: puf.io/socials/2025-...
This is Desert Shark, originally made for Burning Man in 2022, but just now landed at Pier 45 on Embarcadero, right in from of Musée Mécanique.
More on: puf.io/socials/2025-...
I don't often make edits/suggestions on Google Maps. 📍
But when I do, 60% of the time it works every time. 😂
But when I do, 60% of the time it works every time. 😂
December 15, 2025 at 2:40 AM
I don't often make edits/suggestions on Google Maps. 📍
But when I do, 60% of the time it works every time. 😂
But when I do, 60% of the time it works every time. 😂
Tompkins Stairway is a colorful, tiled stairway about a block from the Alemany Farmer's market on the easter edge of Bernal Heights. Opened in 2019, it's yet another beautiful destination in San Francisco if you want to get your steps/stairs in!
More: puf.io/socials/2025-...
More: puf.io/socials/2025-...
December 15, 2025 at 12:29 AM
Tompkins Stairway is a colorful, tiled stairway about a block from the Alemany Farmer's market on the easter edge of Bernal Heights. Opened in 2019, it's yet another beautiful destination in San Francisco if you want to get your steps/stairs in!
More: puf.io/socials/2025-...
More: puf.io/socials/2025-...
I use an LLM differently in cases where I know "nothing" [1] vs cases where I know "everything" [2].
On [1] I check LLM output against my expectations and catch hallucinations with a chuckle/shrug.
On [2] I stick to questions where LLM training data is large and in agreement.
On [1] I check LLM output against my expectations and catch hallucinations with a chuckle/shrug.
On [2] I stick to questions where LLM training data is large and in agreement.
December 14, 2025 at 11:57 AM
I use an LLM differently in cases where I know "nothing" [1] vs cases where I know "everything" [2].
On [1] I check LLM output against my expectations and catch hallucinations with a chuckle/shrug.
On [2] I stick to questions where LLM training data is large and in agreement.
On [1] I check LLM output against my expectations and catch hallucinations with a chuckle/shrug.
On [2] I stick to questions where LLM training data is large and in agreement.
I read For We Are Many (Bobiverse #2) by Dennis E. Taylor - about a man who becomes an AI﹠helps guide humanity across the galaxy. Still fun﹠fast-paced, but I found some arcs more compelling than others. Wished for more depth.
★★★☆☆
Full review: puf.io/books/for-we-...
★★★☆☆
Full review: puf.io/books/for-we-...
December 14, 2025 at 1:28 AM
I read For We Are Many (Bobiverse #2) by Dennis E. Taylor - about a man who becomes an AI﹠helps guide humanity across the galaxy. Still fun﹠fast-paced, but I found some arcs more compelling than others. Wished for more depth.
★★★☆☆
Full review: puf.io/books/for-we-...
★★★☆☆
Full review: puf.io/books/for-we-...
The holidays are always festive around Union Square (San Francisco)! 🎄🌁
Eight oversized ornaments now line Powell Street, leading up to the 83-foot Christmas tree and ice rink.
If you're in SF this season, take a festive stroll.
More on: puf.io/socials/2025-...
Eight oversized ornaments now line Powell Street, leading up to the 83-foot Christmas tree and ice rink.
If you're in SF this season, take a festive stroll.
More on: puf.io/socials/2025-...
December 13, 2025 at 8:23 PM
The holidays are always festive around Union Square (San Francisco)! 🎄🌁
Eight oversized ornaments now line Powell Street, leading up to the 83-foot Christmas tree and ice rink.
If you're in SF this season, take a festive stroll.
More on: puf.io/socials/2025-...
Eight oversized ornaments now line Powell Street, leading up to the 83-foot Christmas tree and ice rink.
If you're in SF this season, take a festive stroll.
More on: puf.io/socials/2025-...
Developer Relations events work often feels intuition-driven: we choose our talks, swag, community, content based on feeling and experience. But you can bring structure to it using the same tool marketers rely on: the adoption funnel.
Read more about it ⬇️🧵
1/3
Read more about it ⬇️🧵
1/3
December 13, 2025 at 1:35 AM
Developer Relations events work often feels intuition-driven: we choose our talks, swag, community, content based on feeling and experience. But you can bring structure to it using the same tool marketers rely on: the adoption funnel.
Read more about it ⬇️🧵
1/3
Read more about it ⬇️🧵
1/3
📚✨ Welcome to the Hyunam-Dong Bookshop is a quiet, feel-good novel that touches on themes of slowing down, stepping away from others’ expectations, and finding comfort in small things. Short chapters, thoughtful pace.
★★★★☆
Full review here: puf.io/books/welcome...
★★★★☆
Full review here: puf.io/books/welcome...
December 12, 2025 at 3:45 PM
📚✨ Welcome to the Hyunam-Dong Bookshop is a quiet, feel-good novel that touches on themes of slowing down, stepping away from others’ expectations, and finding comfort in small things. Short chapters, thoughtful pace.
★★★★☆
Full review here: puf.io/books/welcome...
★★★★☆
Full review here: puf.io/books/welcome...
I'm presenting "Flutter highlights of 2025" next week at the SF Flutter meetup, and getting some help from Gemini/Nano Banana on the graphics.
Anyone wanna guess what this icon is for? 😁
Anyone wanna guess what this icon is for? 😁
December 12, 2025 at 2:50 AM
I'm presenting "Flutter highlights of 2025" next week at the SF Flutter meetup, and getting some help from Gemini/Nano Banana on the graphics.
Anyone wanna guess what this icon is for? 😁
Anyone wanna guess what this icon is for? 😁
📖 🇳🇱 🏠 The Dutch House is an interesting fictional, historic drama. Loved the first half, but the second half dragged with too much reflection. Solid narration by Tom Hanks - fitting, not flashy.
★★★☆☆
Full review: puf.io/books/the-dut...
★★★☆☆
Full review: puf.io/books/the-dut...
December 11, 2025 at 9:22 PM
📖 🇳🇱 🏠 The Dutch House is an interesting fictional, historic drama. Loved the first half, but the second half dragged with too much reflection. Solid narration by Tom Hanks - fitting, not flashy.
★★★☆☆
Full review: puf.io/books/the-dut...
★★★☆☆
Full review: puf.io/books/the-dut...
🥩 San Francisco's Tenderloin Museum celebrates the neighborhood’s gritty history, from concert halls and SRO hotels to Herb Caen’s famous line:
> Any city that doesn’t have a Tenderloin isn’t a city at all
Small in size﹠price, but packed with stories.
puf.io/socials/2025-...
> Any city that doesn’t have a Tenderloin isn’t a city at all
Small in size﹠price, but packed with stories.
puf.io/socials/2025-...
December 10, 2025 at 9:42 PM
🥩 San Francisco's Tenderloin Museum celebrates the neighborhood’s gritty history, from concert halls and SRO hotels to Herb Caen’s famous line:
> Any city that doesn’t have a Tenderloin isn’t a city at all
Small in size﹠price, but packed with stories.
puf.io/socials/2025-...
> Any city that doesn’t have a Tenderloin isn’t a city at all
Small in size﹠price, but packed with stories.
puf.io/socials/2025-...
🌁⛪️🎥 Saw Aura at Grace Cathedral last week: a 45-minute burst of light, music, and projection mapping that turns the whole cathedral into a living canvas. Stunning use of the space. I really enjoyed this one, so check it out.
December 10, 2025 at 4:15 PM
🌁⛪️🎥 Saw Aura at Grace Cathedral last week: a 45-minute burst of light, music, and projection mapping that turns the whole cathedral into a living canvas. Stunning use of the space. I really enjoyed this one, so check it out.
> "If there's one thread through everything I've done, it's this: I want more people to build more apps. Every new builder we empower, whether they write code or drag and drop, expands what's possible in tech." — puf
Hear the full @VGVentures podcast: www.linkedin.com/pos...
Hear the full @VGVentures podcast: www.linkedin.com/pos...
December 10, 2025 at 1:02 AM
> "If there's one thread through everything I've done, it's this: I want more people to build more apps. Every new builder we empower, whether they write code or drag and drop, expands what's possible in tech." — puf
Hear the full @VGVentures podcast: www.linkedin.com/pos...
Hear the full @VGVentures podcast: www.linkedin.com/pos...
The Firebase documentation contains a full list of which API key permissions it requires for each product. This is really handy if you want to lock down your API keys to your specific project needs.
firebase.google.com/...
firebase.google.com/...
December 9, 2025 at 7:09 PM
The Firebase documentation contains a full list of which API key permissions it requires for each product. This is really handy if you want to lock down your API keys to your specific project needs.
firebase.google.com/...
firebase.google.com/...
Find your most expensive and slowest Firestore queries with the (relatively) new query insights panel in the Google Cloud console.
I've already been using this on my projects, leading to both a better experience for my users and a lower bill for me! 🙌
cloud.google.com/fir...
I've already been using this on my projects, leading to both a better experience for my users and a lower bill for me! 🙌
cloud.google.com/fir...
December 8, 2025 at 9:32 PM
Find your most expensive and slowest Firestore queries with the (relatively) new query insights panel in the Google Cloud console.
I've already been using this on my projects, leading to both a better experience for my users and a lower bill for me! 🙌
cloud.google.com/fir...
I've already been using this on my projects, leading to both a better experience for my users and a lower bill for me! 🙌
cloud.google.com/fir...
I'm working on a "Flutter highlights of 2025" talk, and asked Gemini to ask a "wrapped" style image for it. It looks like Dash had a few too many of those holiday cookies here. 💙😂
Link to the event (December 18, SF) in first comment of thread 👇
1/2
Link to the event (December 18, SF) in first comment of thread 👇
1/2
December 8, 2025 at 8:03 PM
I'm working on a "Flutter highlights of 2025" talk, and asked Gemini to ask a "wrapped" style image for it. It looks like Dash had a few too many of those holiday cookies here. 💙😂
Link to the event (December 18, SF) in first comment of thread 👇
1/2
Link to the event (December 18, SF) in first comment of thread 👇
1/2
Seriously @Pebble.
If you make a watch in this gorgeous red, why do you even offer other color options?
❤️🪨⌚️
Also just to make sure: the checkmark means that I've selected that color, right?
If you make a watch in this gorgeous red, why do you even offer other color options?
❤️🪨⌚️
Also just to make sure: the checkmark means that I've selected that color, right?
December 7, 2025 at 11:04 PM
Seriously @Pebble.
If you make a watch in this gorgeous red, why do you even offer other color options?
❤️🪨⌚️
Also just to make sure: the checkmark means that I've selected that color, right?
If you make a watch in this gorgeous red, why do you even offer other color options?
❤️🪨⌚️
Also just to make sure: the checkmark means that I've selected that color, right?
📖🚀 Finally started the Bobiverse book series after sitting on it for a while. It’s about a guy who dies, becomes a 22nd century AI, and explores space. Nerdy and ambitious sci-fi.
Book 1 kicks it off with space exploration, identity questions, and rapid tech development.
1/2
Book 1 kicks it off with space exploration, identity questions, and rapid tech development.
1/2
December 7, 2025 at 7:11 PM
📖🚀 Finally started the Bobiverse book series after sitting on it for a while. It’s about a guy who dies, becomes a 22nd century AI, and explores space. Nerdy and ambitious sci-fi.
Book 1 kicks it off with space exploration, identity questions, and rapid tech development.
1/2
Book 1 kicks it off with space exploration, identity questions, and rapid tech development.
1/2
Reposted by Frank van Puffelen
A data-driven computational blog post as a Lopecode document. Calculations are editable and done live in the post. The prose is inline editable, and you can fork your own copy. This is where I think literate programming should go.
tomlarkworthy.github.io/lopebooks/no...
tomlarkworthy.github.io/lopebooks/no...
@tomlarkworthy/unaggregating-cloudwatch-metrics
tomlarkworthy.github.io
December 7, 2025 at 10:49 AM
A data-driven computational blog post as a Lopecode document. Calculations are editable and done live in the post. The prose is inline editable, and you can fork your own copy. This is where I think literate programming should go.
tomlarkworthy.github.io/lopebooks/no...
tomlarkworthy.github.io/lopebooks/no...
Just finished 12 Miles Below by Mark Arrows - icy world, killer machines﹠a non-stop battle stretch that had me torn on rating. I rounded up, but won't continue the series for now.
★★★★☆
❄️ Fantasy
🤖 Post-apocalyptic Earth
⚔️ Battle-heavy
Link in first comment 👇
1/2
★★★★☆
❄️ Fantasy
🤖 Post-apocalyptic Earth
⚔️ Battle-heavy
Link in first comment 👇
1/2
December 6, 2025 at 8:57 PM
Just finished 12 Miles Below by Mark Arrows - icy world, killer machines﹠a non-stop battle stretch that had me torn on rating. I rounded up, but won't continue the series for now.
★★★★☆
❄️ Fantasy
🤖 Post-apocalyptic Earth
⚔️ Battle-heavy
Link in first comment 👇
1/2
★★★★☆
❄️ Fantasy
🤖 Post-apocalyptic Earth
⚔️ Battle-heavy
Link in first comment 👇
1/2
📚 Awaken Online: Happy by Travis Bagwell
(aka Book #5.5 in the series)
★★★★★
This is the 12th book I’ve read in this VR-litRPG universe - and one of the best yet. Here’s why 👇
1/3
(aka Book #5.5 in the series)
★★★★★
This is the 12th book I’ve read in this VR-litRPG universe - and one of the best yet. Here’s why 👇
1/3
December 6, 2025 at 6:38 PM
📚 Awaken Online: Happy by Travis Bagwell
(aka Book #5.5 in the series)
★★★★★
This is the 12th book I’ve read in this VR-litRPG universe - and one of the best yet. Here’s why 👇
1/3
(aka Book #5.5 in the series)
★★★★★
This is the 12th book I’ve read in this VR-litRPG universe - and one of the best yet. Here’s why 👇
1/3
Pluralistic: The Reverse-Centaur’s Guide to Criticizing AI (05 Dec 2025) – Cory Doctorow
A great article by @doctorow on how to use AI vs being used by AI (companies).
pluralistic.net/2025...
A great article by @doctorow on how to use AI vs being used by AI (companies).
pluralistic.net/2025...
December 5, 2025 at 11:39 PM
Pluralistic: The Reverse-Centaur’s Guide to Criticizing AI (05 Dec 2025) – Cory Doctorow
A great article by @doctorow on how to use AI vs being used by AI (companies).
pluralistic.net/2025...
A great article by @doctorow on how to use AI vs being used by AI (companies).
pluralistic.net/2025...
With all the (valid) noise around the security holes that vibe coding may introduce, I went back to double check some of my recent commits for SQL injection and XSS problems.
This first one looks fine at least... 😅
For those wondering: that's Dart code. 💙
This first one looks fine at least... 😅
For those wondering: that's Dart code. 💙
December 5, 2025 at 10:06 PM
With all the (valid) noise around the security holes that vibe coding may introduce, I went back to double check some of my recent commits for SQL injection and XSS problems.
This first one looks fine at least... 😅
For those wondering: that's Dart code. 💙
This first one looks fine at least... 😅
For those wondering: that's Dart code. 💙
Reposted by Frank van Puffelen
This is the first time Pantone has chosen a shade of white. The company says it's "a lofty white that serves as a symbol of calming influence in a society rediscovering the value of quiet reflection." n.pr/4rDF0jv
You read that white: Pantone's 2026 Color of the Year is 'Cloud Dancer'
This is the first time Pantone has chosen a shade of white. The company says it's "a lofty white that serves as a symbol of calming influence in a society rediscovering the value of quiet reflection."
n.pr
December 5, 2025 at 12:22 AM
This is the first time Pantone has chosen a shade of white. The company says it's "a lofty white that serves as a symbol of calming influence in a society rediscovering the value of quiet reflection." n.pr/4rDF0jv
So far Advent of Code has been fun this year.
The first 3 days were one-dimensional, and today is switched into 2-dimensional maps.
Choosing to do it in C# (which I hadn't really done in a decade) was certainly a choice, but I don't regret it so far. :)
The first 3 days were one-dimensional, and today is switched into 2-dimensional maps.
Choosing to do it in C# (which I hadn't really done in a decade) was certainly a choice, but I don't regret it so far. :)
December 4, 2025 at 11:12 PM
So far Advent of Code has been fun this year.
The first 3 days were one-dimensional, and today is switched into 2-dimensional maps.
Choosing to do it in C# (which I hadn't really done in a decade) was certainly a choice, but I don't regret it so far. :)
The first 3 days were one-dimensional, and today is switched into 2-dimensional maps.
Choosing to do it in C# (which I hadn't really done in a decade) was certainly a choice, but I don't regret it so far. :)