Adam Marcus
@marcua.net
Hummus, people, and data. Co-Founder & CTO of B12. Previously Locu, MIT CSAIL. He/him.
https://marcua.net/
Queens is the future.
https://marcua.net/
Queens is the future.
Reposted by Adam Marcus
Introducing polyglot - A Rust/Wasm SQL transpiler for more than 30 SQL dialects.
It has 100% coverage for sqlglot‘s test fixtures.
github.com/tobilg/polyg...
It has 100% coverage for sqlglot‘s test fixtures.
github.com/tobilg/polyg...
GitHub - tobilg/polyglot: Rust/Wasm-powered SQL transpiler
Rust/Wasm-powered SQL transpiler. Contribute to tobilg/polyglot development by creating an account on GitHub.
github.com
February 14, 2026 at 5:19 PM
Introducing polyglot - A Rust/Wasm SQL transpiler for more than 30 SQL dialects.
It has 100% coverage for sqlglot‘s test fixtures.
github.com/tobilg/polyg...
It has 100% coverage for sqlglot‘s test fixtures.
github.com/tobilg/polyg...
Reposted by Adam Marcus
1/ ProPublica collected handwritten letters in mid-January from children held at the Dilley Immigration Processing Center, the same facility where 5-year-old Liam Conejo Ramos was taken.
Hundreds of kids are still detained.
We’ll let the children’s words speak for themselves. 🧵
Hundreds of kids are still detained.
We’ll let the children’s words speak for themselves. 🧵
February 9, 2026 at 12:25 PM
1/ ProPublica collected handwritten letters in mid-January from children held at the Dilley Immigration Processing Center, the same facility where 5-year-old Liam Conejo Ramos was taken.
Hundreds of kids are still detained.
We’ll let the children’s words speak for themselves. 🧵
Hundreds of kids are still detained.
We’ll let the children’s words speak for themselves. 🧵
Reposted by Adam Marcus
I'm scheduling speakers for NYC Systems 2026. Please DM or email me if you've got a staff/principal engineer or phd student who can come tell us something interesting about compiler / database / systems / infrastructure work!
Schedule is on the site. nycsystems.xyz
Schedule is on the site. nycsystems.xyz
February 6, 2026 at 12:47 AM
I'm scheduling speakers for NYC Systems 2026. Please DM or email me if you've got a staff/principal engineer or phd student who can come tell us something interesting about compiler / database / systems / infrastructure work!
Schedule is on the site. nycsystems.xyz
Schedule is on the site. nycsystems.xyz
Reposted by Adam Marcus
So much great advice in this thread!
I've been in SF for four days and on each day I've had multiple conversations where people (self included) express deep feelings, fear, wonder and worry about their skills being replaced or (this is less named explicitly but an assumed driver I think) no longer valued by others. Big threats to feel
February 5, 2026 at 5:36 PM
So much great advice in this thread!
Reposted by Adam Marcus
I am recruiting a postdoc in HCI & AI!
Interested in augmenting human thinking and learning, futures of work & education, participatory AI, collective intelligence, or related topics? Please get in touch! This 2-year position will be based at a top university in Europe (email or DM for more info)
Interested in augmenting human thinking and learning, futures of work & education, participatory AI, collective intelligence, or related topics? Please get in touch! This 2-year position will be based at a top university in Europe (email or DM for more info)
February 2, 2026 at 2:59 PM
I am recruiting a postdoc in HCI & AI!
Interested in augmenting human thinking and learning, futures of work & education, participatory AI, collective intelligence, or related topics? Please get in touch! This 2-year position will be based at a top university in Europe (email or DM for more info)
Interested in augmenting human thinking and learning, futures of work & education, participatory AI, collective intelligence, or related topics? Please get in touch! This 2-year position will be based at a top university in Europe (email or DM for more info)
Reposted by Adam Marcus
“We found that using AI assistance led to a statistically significant decrease in mastery.”
Props to Anthropic for studying the effects of their creation and reporting results that are not probably what they wished for
www.anthropic.com/research/AI-...
Props to Anthropic for studying the effects of their creation and reporting results that are not probably what they wished for
www.anthropic.com/research/AI-...
How AI assistance impacts the formation of coding skills
Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.
www.anthropic.com
January 31, 2026 at 3:50 AM
“We found that using AI assistance led to a statistically significant decrease in mastery.”
Props to Anthropic for studying the effects of their creation and reporting results that are not probably what they wished for
www.anthropic.com/research/AI-...
Props to Anthropic for studying the effects of their creation and reporting results that are not probably what they wished for
www.anthropic.com/research/AI-...
Reposted by Adam Marcus
First blog post of the year! In "Claude Code and core dumps" I share how a coding agent helped me resolve a production incident. The agent parsed core dumps to track down a decade-old bug: someone had set a radio stream as their RSS feed!
blog.marcua.net/2026/01/28/c...
blog.marcua.net/2026/01/28/c...
Claude Code and core dumps
It’s after dinner on the holidays and you’re on call when a production system alarm starts to go off. After doing some initial investigation, you find that the issue is not a common one you or your te...
blog.marcua.net
January 28, 2026 at 5:06 PM
First blog post of the year! In "Claude Code and core dumps" I share how a coding agent helped me resolve a production incident. The agent parsed core dumps to track down a decade-old bug: someone had set a radio stream as their RSS feed!
blog.marcua.net/2026/01/28/c...
blog.marcua.net/2026/01/28/c...
Reposted by Adam Marcus
💔💔💔💔
“[Liam] keeps asking about that hat and that backpack that are in the picture,” the congressman said. “I think they took that from him.”
www.cnn.com/2026/01/28/u...
www.cnn.com/2026/01/28/u...
Rep. Joaquin Castro meets with the 5-year-old boy held with his father at a Texas detention facility | CNN
US Rep. Joaquin Castro met Wednesday with Liam Conejo Ramos, the 5-year-old Minnesota boy taken from his family’s suburban Minneapolis driveway last week after federal agents apprehended his father, t...
www.cnn.com
January 29, 2026 at 1:36 PM
💔💔💔💔
First blog post of the year! In "Claude Code and core dumps" I share how a coding agent helped me resolve a production incident. The agent parsed core dumps to track down a decade-old bug: someone had set a radio stream as their RSS feed!
blog.marcua.net/2026/01/28/c...
blog.marcua.net/2026/01/28/c...
Claude Code and core dumps
It’s after dinner on the holidays and you’re on call when a production system alarm starts to go off. After doing some initial investigation, you find that the issue is not a common one you or your te...
blog.marcua.net
January 28, 2026 at 5:06 PM
First blog post of the year! In "Claude Code and core dumps" I share how a coding agent helped me resolve a production incident. The agent parsed core dumps to track down a decade-old bug: someone had set a radio stream as their RSS feed!
blog.marcua.net/2026/01/28/c...
blog.marcua.net/2026/01/28/c...
Reposted by Adam Marcus
I've posted my latest recap of the world of databases: www.cs.cmu.edu/~pavlo/blog/...
All the hot topics from the last year:
• More Postgres action!
• MCP for everyone!
• MongoDB gets litigious with FerretDB!
• File formats!
• Market movements!
• The richest person in the history of the world!
All the hot topics from the last year:
• More Postgres action!
• MCP for everyone!
• MongoDB gets litigious with FerretDB!
• File formats!
• Market movements!
• The richest person in the history of the world!
Databases in 2025: A Year in Review
The world tried to kill Andy off but he had to stay alive to to talk about what happened with databases in 2025.
www.cs.cmu.edu
January 5, 2026 at 2:14 PM
I've posted my latest recap of the world of databases: www.cs.cmu.edu/~pavlo/blog/...
All the hot topics from the last year:
• More Postgres action!
• MCP for everyone!
• MongoDB gets litigious with FerretDB!
• File formats!
• Market movements!
• The richest person in the history of the world!
All the hot topics from the last year:
• More Postgres action!
• MCP for everyone!
• MongoDB gets litigious with FerretDB!
• File formats!
• Market movements!
• The richest person in the history of the world!
Reposted by Adam Marcus
As a teacher, I have really serious concerns about how to adapt to this: LLMs let you more quickly build complex systems, but you can't handle a complex system without having gained experience building/debugging/architecting simpler systems. Which means...
January 1, 2026 at 5:56 PM
As a teacher, I have really serious concerns about how to adapt to this: LLMs let you more quickly build complex systems, but you can't handle a complex system without having gained experience building/debugging/architecting simpler systems. Which means...
Reposted by Adam Marcus
A reminder that it's your last day for 2025 charitable giving. Food insecurity, homelessness, and reproductive health services are big on my list of targets but whatever yours are, now's the time to finish them if you haven't
December 31, 2025 at 2:22 PM
A reminder that it's your last day for 2025 charitable giving. Food insecurity, homelessness, and reproductive health services are big on my list of targets but whatever yours are, now's the time to finish them if you haven't
Reposted by Adam Marcus
If like me you have a mental model that SQLite doesn't accept outside contributions you should update it, I just got called out by D. Richard Hipp for spreading that misinformation in a comment on Hacker News simonwillison.net/2025/Dec/29/...
Copyright Release for Contributions To SQLite
D. Richard Hipp called me out for spreading misinformation on Hacker News that SQLite refuses outside contributions: No, Simon, we don't "refuse". We are just very selective and there is …
simonwillison.net
December 29, 2025 at 8:08 PM
If like me you have a mental model that SQLite doesn't accept outside contributions you should update it, I just got called out by D. Richard Hipp for spreading that misinformation in a comment on Hacker News simonwillison.net/2025/Dec/29/...
Reposted by Adam Marcus
Please don't forget to give what you can this year, we can't come close to filling the gap that our government has created but it still matters
Most Americans aren’t making end-of-year charitable giving plans, according to the results of a new AP-NORC poll, despite the many fundraising appeals made by nonprofits that rely on donation surges in the calendar’s final month to reach budget targets. https://to.pbs.org/4prpLIt
Most Americans aren't making year-end charitable contributions, poll finds
Most Americans aren’t making end-of-year charitable giving plans, despite the many fundraising appeals made by nonprofits that rely on donation surges in the calendar’s final month to reach next year’...
www.pbs.org
December 22, 2025 at 11:59 PM
Please don't forget to give what you can this year, we can't come close to filling the gap that our government has created but it still matters
I’m excited to share Review, a bookmarklet that makes it easier for you to code review AI coding agents. The bookmarklet turns all unresolved comments on a GitHub pull request into a Markdown-formatted text blob that you can paste into your coding agent of choice. marcua.net/minitools/re...
December 11, 2025 at 2:22 PM
I’m excited to share Review, a bookmarklet that makes it easier for you to code review AI coding agents. The bookmarklet turns all unresolved comments on a GitHub pull request into a Markdown-formatted text blob that you can paste into your coding agent of choice. marcua.net/minitools/re...
This is a great idea, and I'd be excited to buy you a hummus and hear about your research. NYC <3 research!
If you're a PhD student traveling to NYC this holiday season, let me buy you lunch.
Friends don't let PhD friends travel to NYC without this.
Friends don't let PhD friends travel to NYC without this.
 me when you'll be
around.
</p>
<p>
The list has included women and men from:
</p>
<ul>
+ <li>Stanford University</li>
<li>Carnegie Mellon University</li>
<li>University of Maryland</li>
<li>University of Wisconsin</li>
<li>New York University</li>
<li>University of Pennsylvania</li>
<li>University of Washington</li>
</ul>](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:pulwqklvmu4jhv7qc52wud47/bafkreif3evr2oik5hm5a57h52xg6h6fgrr5qgxjdtndckqulxstpuof3ma@jpeg)
December 10, 2025 at 5:21 PM
This is a great idea, and I'd be excited to buy you a hummus and hear about your research. NYC <3 research!
Reposted by Adam Marcus
I've done a few conference talks and been on a few CFP boards now, so if anyone is nervous about submitting or wants an extra ear to chat about their topic with before submitting, I'm happy to workshop it with you! 😁
December 2, 2025 at 2:52 PM
I've done a few conference talks and been on a few CFP boards now, so if anyone is nervous about submitting or wants an extra ear to chat about their topic with before submitting, I'm happy to workshop it with you! 😁
Reposted by Adam Marcus
This is...sort of brilliant.
November 19, 2025 at 12:56 PM
This is...sort of brilliant.
My favorite spot for dhindo thali in Jackson Heights just got cooler!
A busy first day as your Mayor-elect: early morning interviews, transition announcements and meetings. More to say on all of it tomorrow.
But a highlight was lunch with my Congresswoman @aoc.bsky.social at Laliguras Bistro in Jackson Heights.
But a highlight was lunch with my Congresswoman @aoc.bsky.social at Laliguras Bistro in Jackson Heights.
November 6, 2025 at 4:36 AM
My favorite spot for dhindo thali in Jackson Heights just got cooler!
Reposted by Adam Marcus
Hey NYers, today is the day -- get out and vote!
November 4, 2025 at 5:44 PM
Hey NYers, today is the day -- get out and vote!
Reposted by Adam Marcus
Was honored to help @chana.bsky.social edit this deep dive compilation of Curtis Sliwa lore gathered over weeks. There is so much jaw-dropping material, we simply could not bear to make it shorter than 76 slides.
I’m sorry but you still don’t know enough about Curtis Sliwa
I’m sorry but you still don’t know enough about Curtis Sliwa
docs.google.com
November 3, 2025 at 3:58 AM
Was honored to help @chana.bsky.social edit this deep dive compilation of Curtis Sliwa lore gathered over weeks. There is so much jaw-dropping material, we simply could not bear to make it shorter than 76 slides.
Reposted by Adam Marcus
It's not enough but we've gotta do what we can. cityharvest.org here in NYC or Bowery mission are good options
October 25, 2025 at 4:53 AM
It's not enough but we've gotta do what we can. cityharvest.org here in NYC or Bowery mission are good options
Reposted by Adam Marcus
New short blog post, touching on how I'd redesign UUIDv7 to keep the database performance benefits while mitigating most of the downsides.
Short version: replace unix_ms with H(unix_ms, unix_ms >> 13 | salt).
Get yer extremely niche RFC commentary here: brooker.co.za/blog/2025/10...
Short version: replace unix_ms with H(unix_ms, unix_ms >> 13 | salt).
Get yer extremely niche RFC commentary here: brooker.co.za/blog/2025/10...
Fixing UUIDv7 (for database use-cases) - Marc's Blog
brooker.co.za
October 22, 2025 at 11:21 PM
New short blog post, touching on how I'd redesign UUIDv7 to keep the database performance benefits while mitigating most of the downsides.
Short version: replace unix_ms with H(unix_ms, unix_ms >> 13 | salt).
Get yer extremely niche RFC commentary here: brooker.co.za/blog/2025/10...
Short version: replace unix_ms with H(unix_ms, unix_ms >> 13 | salt).
Get yer extremely niche RFC commentary here: brooker.co.za/blog/2025/10...
This one made my brain move in many directions. Not sure I have some conclusive takeaway/worldview after reading it, but it felt good to sit with for a while: theoatmeal.com/comics/ai_art
A cartoonist's review of AI art - The Oatmeal
This is a comic about AI art.
theoatmeal.com
October 8, 2025 at 4:05 PM
This one made my brain move in many directions. Not sure I have some conclusive takeaway/worldview after reading it, but it felt good to sit with for a while: theoatmeal.com/comics/ai_art
Reposted by Adam Marcus
Social media feeds today are optimized for engagement, often leading to misalignment between users' intentions and technology use.
In a new paper, we introduce Bonsai, a tool to create feeds based on stated preferences, rather than predicted engagement.
arxiv.org/abs/2509.10776
In a new paper, we introduce Bonsai, a tool to create feeds based on stated preferences, rather than predicted engagement.
arxiv.org/abs/2509.10776
September 16, 2025 at 1:24 PM
Social media feeds today are optimized for engagement, often leading to misalignment between users' intentions and technology use.
In a new paper, we introduce Bonsai, a tool to create feeds based on stated preferences, rather than predicted engagement.
arxiv.org/abs/2509.10776
In a new paper, we introduce Bonsai, a tool to create feeds based on stated preferences, rather than predicted engagement.
arxiv.org/abs/2509.10776