Sumiya
@sumiya.page
Husband. Dad.
Creator of https://amazonoraws.com, and online JsonPath evaluator, https://sumiya.page/jpath.html.
Opinions mine, not my employer’s.
I occasionally blog here: https://sumiya.page
Engineering Manager at Nike.
Creator of https://amazonoraws.com, and online JsonPath evaluator, https://sumiya.page/jpath.html.
Opinions mine, not my employer’s.
I occasionally blog here: https://sumiya.page
Engineering Manager at Nike.
As someone who struggles with using new UIs to get things done, AI has been a really helpful in putting together custom scripts and UI/UX.
I was asked to put together a demo at the last minute using some existing pre-recorded stuff and some new material.
1/
I was asked to put together a demo at the last minute using some existing pre-recorded stuff and some new material.
1/
January 23, 2026 at 4:58 PM
As someone who struggles with using new UIs to get things done, AI has been a really helpful in putting together custom scripts and UI/UX.
I was asked to put together a demo at the last minute using some existing pre-recorded stuff and some new material.
1/
I was asked to put together a demo at the last minute using some existing pre-recorded stuff and some new material.
1/
Yep. Success in business will continue to remain really hard. Just because I can build a thing fast doesn’t mean I built the right thing. And then even if I built the right thing doesn’t mean I have the right structures and processes in place to continue to scale it successfully.
One thing many miss about the potential impact of AI on the tech industry: better tools raise the *floor*
Look at games. Building a game engine used to be a MASSIVE effort. Today, games engines are commoditized. And yet it's gotten harder, not easier to build a game that stands out!
Look at games. Building a game engine used to be a MASSIVE effort. Today, games engines are commoditized. And yet it's gotten harder, not easier to build a game that stands out!
January 11, 2026 at 4:29 PM
Yep. Success in business will continue to remain really hard. Just because I can build a thing fast doesn’t mean I built the right thing. And then even if I built the right thing doesn’t mean I have the right structures and processes in place to continue to scale it successfully.
Reposted by Sumiya
Last November, I used spec-driven development for a frontend project. This past weekend, I went the other way: a complete backend-only resurrection.
After a 4-year dormant repo, I’ve rebooted jcli. Here is how I used Antigravity and Gemini 3 Pro (High) to do it.
(1/5)
After a 4-year dormant repo, I’ve rebooted jcli. Here is how I used Antigravity and Gemini 3 Pro (High) to do it.
(1/5)
January 6, 2026 at 5:16 AM
Last November, I used spec-driven development for a frontend project. This past weekend, I went the other way: a complete backend-only resurrection.
After a 4-year dormant repo, I’ve rebooted jcli. Here is how I used Antigravity and Gemini 3 Pro (High) to do it.
(1/5)
After a 4-year dormant repo, I’ve rebooted jcli. Here is how I used Antigravity and Gemini 3 Pro (High) to do it.
(1/5)
Last November, I used spec-driven development for a frontend project. This past weekend, I went the other way: a complete backend-only resurrection.
After a 4-year dormant repo, I’ve rebooted jcli. Here is how I used Antigravity and Gemini 3 Pro (High) to do it.
(1/5)
After a 4-year dormant repo, I’ve rebooted jcli. Here is how I used Antigravity and Gemini 3 Pro (High) to do it.
(1/5)
January 6, 2026 at 5:16 AM
Last November, I used spec-driven development for a frontend project. This past weekend, I went the other way: a complete backend-only resurrection.
After a 4-year dormant repo, I’ve rebooted jcli. Here is how I used Antigravity and Gemini 3 Pro (High) to do it.
(1/5)
After a 4-year dormant repo, I’ve rebooted jcli. Here is how I used Antigravity and Gemini 3 Pro (High) to do it.
(1/5)
Here is a free options trading analytics tool I built after getting tired of manually tracking trades in spreadsheets.
insights.sumiya.page
Upload your broker CSV, get instant insights.
Everything runs in your browser, your data never leaves your machine.
#personalfinance #optionstrading
insights.sumiya.page
Upload your broker CSV, get instant insights.
Everything runs in your browser, your data never leaves your machine.
#personalfinance #optionstrading
Option Insights
insights.sumiya.page
November 29, 2025 at 6:47 AM
Here is a free options trading analytics tool I built after getting tired of manually tracking trades in spreadsheets.
insights.sumiya.page
Upload your broker CSV, get instant insights.
Everything runs in your browser, your data never leaves your machine.
#personalfinance #optionstrading
insights.sumiya.page
Upload your broker CSV, get instant insights.
Everything runs in your browser, your data never leaves your machine.
#personalfinance #optionstrading
"Why use GenAI when it hallucinates?"
Someone asked this in a training session a couple weeks ago. My answer: it depends.
A tiny story first.
Someone asked this in a training session a couple weeks ago. My answer: it depends.
A tiny story first.
November 23, 2025 at 5:39 PM
"Why use GenAI when it hallucinates?"
Someone asked this in a training session a couple weeks ago. My answer: it depends.
A tiny story first.
Someone asked this in a training session a couple weeks ago. My answer: it depends.
A tiny story first.
September 18, 2025 at 2:51 PM
Really hoping something like this to come out in favor of Intel. A lot of my friends and neighbors work there, and while some have been able to find new jobs, many still are with Intel. And with Intel planning to shutdown foundry, adjacent contractors in the area perhaps are also going to be hit.
Samsung announces a $16.5B deal to produce chips that runs through the end of 2033 and boosts its underperforming foundry unit; source: Tesla is the customer (Bloomberg)
Main Link | Techmeme Permalink
Main Link | Techmeme Permalink
July 28, 2025 at 4:19 AM
Really hoping something like this to come out in favor of Intel. A lot of my friends and neighbors work there, and while some have been able to find new jobs, many still are with Intel. And with Intel planning to shutdown foundry, adjacent contractors in the area perhaps are also going to be hit.
I am generally bullish on technology, but this is an excellent breakdown of the systemic risks in the present AI landscape.
Newsletter: This is the Hater's Guide To The AI Bubble: genAI is nothing like Uber or Amazon Web Services, there are no profitable genAI companies, agents do not and cannot exist, there is no AI SaaS story, and everything rides - and dies - on selling GPUs.
www.wheresyoured.at/the-haters-g...
www.wheresyoured.at/the-haters-g...
The Hater's Guide To The AI Bubble
Hey! Before we go any further — if you want to support my work, please sign up for the premium version of Where’s Your Ed At, it’s a $7-a-month (or $70-a-year) paid product where every week you get a ...
www.wheresyoured.at
July 27, 2025 at 4:36 AM
I am generally bullish on technology, but this is an excellent breakdown of the systemic risks in the present AI landscape.
Builders seem to be still looking for improvement on the existing tools in the AI ecosystem. I went to try and explore Kiro from Amazon/AWS, and see that they have now put a waitlist up.
July 18, 2025 at 1:22 AM
Builders seem to be still looking for improvement on the existing tools in the AI ecosystem. I went to try and explore Kiro from Amazon/AWS, and see that they have now put a waitlist up.
Reposted by Sumiya
Wrote a thought experiment. Imagine you’re leading a high-performing team when one person approaches you with this proposal: "Give me a 5% raise, and I’ll deliver 10% more value."
Sounds straightforward? Now you have two other equally excellent performers. WWYD?
sumiya.page/2025/July/ra...
Sounds straightforward? Now you have two other equally excellent performers. WWYD?
sumiya.page/2025/July/ra...
Three Top Performers, One Raise: A Leadership Thought Experiment
sumiya.page
July 17, 2025 at 1:02 AM
Wrote a thought experiment. Imagine you’re leading a high-performing team when one person approaches you with this proposal: "Give me a 5% raise, and I’ll deliver 10% more value."
Sounds straightforward? Now you have two other equally excellent performers. WWYD?
sumiya.page/2025/July/ra...
Sounds straightforward? Now you have two other equally excellent performers. WWYD?
sumiya.page/2025/July/ra...
Wrote a thought experiment. Imagine you’re leading a high-performing team when one person approaches you with this proposal: "Give me a 5% raise, and I’ll deliver 10% more value."
Sounds straightforward? Now you have two other equally excellent performers. WWYD?
sumiya.page/2025/July/ra...
Sounds straightforward? Now you have two other equally excellent performers. WWYD?
sumiya.page/2025/July/ra...
Three Top Performers, One Raise: A Leadership Thought Experiment
sumiya.page
July 17, 2025 at 1:02 AM
Wrote a thought experiment. Imagine you’re leading a high-performing team when one person approaches you with this proposal: "Give me a 5% raise, and I’ll deliver 10% more value."
Sounds straightforward? Now you have two other equally excellent performers. WWYD?
sumiya.page/2025/July/ra...
Sounds straightforward? Now you have two other equally excellent performers. WWYD?
sumiya.page/2025/July/ra...
How to wreck your LLM?
"I am stuck on this problem and cannot resolve it within the given time. I will stop trying to fix it now."
I tried Gemini CLI. It went great initially, before failing. On a fairly innocuous experiment. I wrote a short snippet on my blog: sumiya.page/2025/June/ge...
"I am stuck on this problem and cannot resolve it within the given time. I will stop trying to fix it now."
I tried Gemini CLI. It went great initially, before failing. On a fairly innocuous experiment. I wrote a short snippet on my blog: sumiya.page/2025/June/ge...
Exploring Gemini Cli
sumiya.page
June 30, 2025 at 6:28 AM
How to wreck your LLM?
"I am stuck on this problem and cannot resolve it within the given time. I will stop trying to fix it now."
I tried Gemini CLI. It went great initially, before failing. On a fairly innocuous experiment. I wrote a short snippet on my blog: sumiya.page/2025/June/ge...
"I am stuck on this problem and cannot resolve it within the given time. I will stop trying to fix it now."
I tried Gemini CLI. It went great initially, before failing. On a fairly innocuous experiment. I wrote a short snippet on my blog: sumiya.page/2025/June/ge...
Here is my *Hold me to this in 5 years* take.
Companies where such a repatriation is:
- Successful: CEO is a fanatic to get this outcome and/or company has < 2 Billion USD in revenue
- Unsuccessful: Enterprises that attempt a repatriation where IT/Tech strategy is orthogonal to core business value
Companies where such a repatriation is:
- Successful: CEO is a fanatic to get this outcome and/or company has < 2 Billion USD in revenue
- Unsuccessful: Enterprises that attempt a repatriation where IT/Tech strategy is orthogonal to core business value
Remember when Zynga tried to leave AWS, failed spectacularly, and came crawling back? Somehow that story never makes it into the “cloud repatriation” sales decks. Funny how selective memory works when you're selling something…
www.lastweekinaws.com/blog/cloud-r...
www.lastweekinaws.com/blog/cloud-r...
Cloud Repatriation is Getting Complicated
Five years ago, I fairly confidently stated that Cloud Repatriation Isn’t a Thing, and I by and large stand by what I wrote. That said, it’s 2025, and the story has changed somewhat.
www.lastweekinaws.com
May 30, 2025 at 2:53 AM
Here is my *Hold me to this in 5 years* take.
Companies where such a repatriation is:
- Successful: CEO is a fanatic to get this outcome and/or company has < 2 Billion USD in revenue
- Unsuccessful: Enterprises that attempt a repatriation where IT/Tech strategy is orthogonal to core business value
Companies where such a repatriation is:
- Successful: CEO is a fanatic to get this outcome and/or company has < 2 Billion USD in revenue
- Unsuccessful: Enterprises that attempt a repatriation where IT/Tech strategy is orthogonal to core business value
It is true that AI can help you get to a prototype way faster than what was possible 2-3 years ago.
However, any builder worth their salt knows that a prototype is not a consumer ready system.
However, any builder worth their salt knows that a prototype is not a consumer ready system.
May 29, 2025 at 3:44 AM
It is true that AI can help you get to a prototype way faster than what was possible 2-3 years ago.
However, any builder worth their salt knows that a prototype is not a consumer ready system.
However, any builder worth their salt knows that a prototype is not a consumer ready system.
As an Eng. Manager, how do I retain context for everything that my teams are delivering?
I've been thinking about how to model this mathematically.
Say:
- Delivery = y.
- Inputs = x.
y = f(x)
What are the things I should track?
- y: Of, course!
- x: Not so much?
- dy/dx: Absolutely?
I've been thinking about how to model this mathematically.
Say:
- Delivery = y.
- Inputs = x.
y = f(x)
What are the things I should track?
- y: Of, course!
- x: Not so much?
- dy/dx: Absolutely?
March 29, 2025 at 4:36 PM
As an Eng. Manager, how do I retain context for everything that my teams are delivering?
I've been thinking about how to model this mathematically.
Say:
- Delivery = y.
- Inputs = x.
y = f(x)
What are the things I should track?
- y: Of, course!
- x: Not so much?
- dy/dx: Absolutely?
I've been thinking about how to model this mathematically.
Say:
- Delivery = y.
- Inputs = x.
y = f(x)
What are the things I should track?
- y: Of, course!
- x: Not so much?
- dy/dx: Absolutely?
Reposted by Sumiya
tl;dr:
Growth = time x discomfort x process
If you have not really felt the pain of spending time to help someone improve, be honest and ask yourself when did you last improve on any aspect in your life without spending any time, without any structure, and generally being uncomfortable?
Growth = time x discomfort x process
If you have not really felt the pain of spending time to help someone improve, be honest and ask yourself when did you last improve on any aspect in your life without spending any time, without any structure, and generally being uncomfortable?
February 21, 2025 at 2:48 PM
tl;dr:
Growth = time x discomfort x process
If you have not really felt the pain of spending time to help someone improve, be honest and ask yourself when did you last improve on any aspect in your life without spending any time, without any structure, and generally being uncomfortable?
Growth = time x discomfort x process
If you have not really felt the pain of spending time to help someone improve, be honest and ask yourself when did you last improve on any aspect in your life without spending any time, without any structure, and generally being uncomfortable?
I was thinking about Feedback, specifically in terms of getting better at providing performance-related feedback.
I wrote a think-y piece on my personal blog: sumiya.page/2025/Februar...
I wrote a think-y piece on my personal blog: sumiya.page/2025/Februar...
Feedback
sumiya.page
February 21, 2025 at 2:48 PM
I was thinking about Feedback, specifically in terms of getting better at providing performance-related feedback.
I wrote a think-y piece on my personal blog: sumiya.page/2025/Februar...
I wrote a think-y piece on my personal blog: sumiya.page/2025/Februar...
Reposted by Sumiya
Reposted by Sumiya
Did you know that YouTube has a RSS feed for its channels?
I added AWS YouTube Channel’s Video Feed to my site amazonoraws.com.
I wrote a TIL: github.com/psumiya/til/...
I added AWS YouTube Channel’s Video Feed to my site amazonoraws.com.
I wrote a TIL: github.com/psumiya/til/...
January 4, 2025 at 9:29 PM
Did you know that YouTube has a RSS feed for its channels?
I added AWS YouTube Channel’s Video Feed to my site amazonoraws.com.
I wrote a TIL: github.com/psumiya/til/...
I added AWS YouTube Channel’s Video Feed to my site amazonoraws.com.
I wrote a TIL: github.com/psumiya/til/...
Did you know that YouTube has a RSS feed for its channels?
I added AWS YouTube Channel’s Video Feed to my site amazonoraws.com.
I wrote a TIL: github.com/psumiya/til/...
I added AWS YouTube Channel’s Video Feed to my site amazonoraws.com.
I wrote a TIL: github.com/psumiya/til/...
January 4, 2025 at 9:29 PM
Did you know that YouTube has a RSS feed for its channels?
I added AWS YouTube Channel’s Video Feed to my site amazonoraws.com.
I wrote a TIL: github.com/psumiya/til/...
I added AWS YouTube Channel’s Video Feed to my site amazonoraws.com.
I wrote a TIL: github.com/psumiya/til/...
Reposted by Sumiya
I recently read `How to Add 'Share on Bluesky' Action Intent Button to Your Website` here: www.pietschsoft.com/post/2024/11...
I promptly decided to try it out on one of my sites. See the final result here: amazonoraws.com/recent-aws-posts.html
I wrote a short TIL here: github.com/psumiya/til/...
I promptly decided to try it out on one of my sites. See the final result here: amazonoraws.com/recent-aws-posts.html
I wrote a short TIL here: github.com/psumiya/til/...
January 2, 2025 at 5:34 AM
I recently read `How to Add 'Share on Bluesky' Action Intent Button to Your Website` here: www.pietschsoft.com/post/2024/11...
I promptly decided to try it out on one of my sites. See the final result here: amazonoraws.com/recent-aws-posts.html
I wrote a short TIL here: github.com/psumiya/til/...
I promptly decided to try it out on one of my sites. See the final result here: amazonoraws.com/recent-aws-posts.html
I wrote a short TIL here: github.com/psumiya/til/...
I recently read `How to Add 'Share on Bluesky' Action Intent Button to Your Website` here: www.pietschsoft.com/post/2024/11...
I promptly decided to try it out on one of my sites. See the final result here: amazonoraws.com/recent-aws-posts.html
I wrote a short TIL here: github.com/psumiya/til/...
I promptly decided to try it out on one of my sites. See the final result here: amazonoraws.com/recent-aws-posts.html
I wrote a short TIL here: github.com/psumiya/til/...
January 2, 2025 at 5:34 AM
I recently read `How to Add 'Share on Bluesky' Action Intent Button to Your Website` here: www.pietschsoft.com/post/2024/11...
I promptly decided to try it out on one of my sites. See the final result here: amazonoraws.com/recent-aws-posts.html
I wrote a short TIL here: github.com/psumiya/til/...
I promptly decided to try it out on one of my sites. See the final result here: amazonoraws.com/recent-aws-posts.html
I wrote a short TIL here: github.com/psumiya/til/...
Reposted by Sumiya
Here's my end-of-year review of things we learned out about LLMs in 2024 - we learned a LOT of things simonwillison.net/2024/Dec/31/...
Table of contents:
Table of contents:
December 31, 2024 at 6:10 PM
Here's my end-of-year review of things we learned out about LLMs in 2024 - we learned a LOT of things simonwillison.net/2024/Dec/31/...
Table of contents:
Table of contents: