HN user

mattmarcus

651 karma

Co-Founder/CEO at Modern Treasury (YC S18) (https://www.moderntreasury.com/)

Posts63
Comments15
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dmodel.ai 21d ago

Discovering Concept-Editing Algorithms with LLM Agents

mattmarcus
7pts0
www.moderntreasury.com 22d ago

Reducing Feedback Latency with Local CI for Developers and AI Agents

mattmarcus
3pts0
www.sec.gov 1mo ago

Bending Spoons S-1

mattmarcus
5pts1
www.moderntreasury.com 6mo ago

How Well Do LLMs Know Double-Entry Accounting?

mattmarcus
2pts0
www.parafin.com 8mo ago

From early‑stage shortcuts to a ledger of record

mattmarcus
1pts0
www.moderntreasury.com 11mo ago

Floats Don't Work for Storing Cents

mattmarcus
12pts2
stytch.com 1y ago

If an AI agent can't figure out how your API works, neither can your users

mattmarcus
97pts52
www.moderntreasury.com 1y ago

Bringing Agentic AI to Payment Operations

mattmarcus
24pts0
dmodel.ai 1y ago

LLMs understand nullability

mattmarcus
170pts134
www.sec.gov 1y ago

Klarna F-1

mattmarcus
5pts0
stytch.com 1y ago

Detecting AI agent use and abuse

mattmarcus
160pts99
www.moderntreasury.com 1y ago

Will FedACH process ACH payments on the National Day of Mourning, Jan 9, 2025?

mattmarcus
22pts2
news.alvaroduran.com 1y ago

How Modern Treasury Invented Event Locking

mattmarcus
1pts0
www.moderntreasury.com 2y ago

How We Built Ledgers for High Throughput

mattmarcus
22pts0
www.moderntreasury.com 2y ago

State of Payment Operations 2023

mattmarcus
17pts0
opportunityinsights.org 2y ago

Determinants and Causal Effects of Admission to Highly Selective Private College [pdf]

mattmarcus
2pts0
github.com 3y ago

Examples of Using Modern Treasury’s Pre-Built UIs

mattmarcus
14pts0
news.ycombinator.com 3y ago

SVB's programmatic payment systems are back online

mattmarcus
130pts65
www.moderntreasury.com 3y ago

Status page for SVB payment systems

mattmarcus
115pts18
www.sec.gov 4y ago

Justworks S-1

mattmarcus
43pts37
frontierfintech.substack.com 4y ago

B2B Payment Operations

mattmarcus
1pts0
www.sec.gov 4y ago

Expensify S-1

mattmarcus
119pts119
kunle.app 4y ago

Underexplored tactics for driving card adoption

mattmarcus
1pts0
news.ycombinator.com 4y ago

Ask HN: Are batch endpoints a good pattern in REST APIs?

mattmarcus
9pts12
www.warhistoryonline.com 4y ago

Purple Heart Stockpile: The WWII Medals Still Being Issued

mattmarcus
2pts1
sec.report 5y ago

SentinelOne S-1

mattmarcus
2pts0
www.sec.gov 5y ago

Confluent S-1

mattmarcus
95pts36
boz.com 5y ago

Failure Theory

mattmarcus
2pts0
www.businesswire.com 5y ago

Modern Treasury Passes $1B per Month in Reconciled Volume

mattmarcus
10pts0
www.moderntreasury.com 5y ago

What Happens When the Fed Goes Down?

mattmarcus
15pts0

Yup, it is SFTP for both sending files (initiating payments) and receiving files (getting balances, confirmations, etc). This is how most programmatic money movement was happening under the hood at SVB (and many other banks for that matter).

Modern Treasury | Software Engineers and Product Managers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com

Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $133M in backing from YC, Benchmark, Altimeter, and angel investors like Paul Graham and Jessica Livingston.

You might have seen some of our content on HN, like "Adding Optimistic Locking to an API": https://news.ycombinator.com/item?id=28314623 We work on fun, hard problems like this that help the most innovative companies in the world grow faster.

If this sounds interesting to you, send me an email. I'm matt (at) moderntreasury (dot) com. Or apply on our jobs page https://www.moderntreasury.com/careers?utm_source=yYPEbOqnBd

Modern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com

Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $133M in backing from YC, Benchmark, Altimeter, and angel investors like Paul Graham and Jessica Livingston.

You might have seen some of our content on HN, like "Adding Optimistic Locking to an API": https://news.ycombinator.com/item?id=28314623 We work on fun, hard problems like this that help the most innovative companies in the world grow faster.

If this sounds interesting to you, send me an email. I'm matt (at) moderntreasury (dot) com. Or apply on our jobs page https://www.moderntreasury.com/careers?utm_source=yYPEbOqnBd

Modern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com

Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $133M in backing from YC, Benchmark, Altimeter, and angel investors like Paul Graham and Jessica Livingston.

You might have seen some of our content on HN, like "Adding Optimistic Locking to an API": https://news.ycombinator.com/item?id=28314623 We work on fun, hard problems like this that help the most innovative companies in the world grow faster.

If this sounds interesting to you, send me an email. I'm matt (at) moderntreasury (dot) com. Or apply on our jobs page https://www.moderntreasury.com/careers?utm_source=yYPEbOqnBd

Modern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com

Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $133M in backing from YC, Benchmark, Altimeter, and angel investors like Paul Graham and Jessica Livingston.

You might have seen some of our content on HN, like "Adding Optimistic Locking to an API": https://news.ycombinator.com/item?id=28314623 We work on fun, hard problems like this that help the most innovative companies in the world grow faster.

If this sounds interesting to you, send me an email. I'm matt (at) moderntreasury (dot) com. Or apply on our jobs page https://www.moderntreasury.com/careers?utm_source=yYPEbOqnBd

Modern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com

Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $133M in backing from YC, Benchmark, Altimeter, and angel investors like Paul Graham and Jessica Livingston.

You might have seen some of our content on HN, like "Adding Optimistic Locking to an API": https://news.ycombinator.com/item?id=28314623 We work on fun, hard problems like this that help the most innovative companies in the world grow faster.

If this sounds interesting to you, send me an email. I'm matt (at) moderntreasury (dot) com. Or apply on our jobs page https://www.moderntreasury.com/careers?utm_source=yYPEbOqnBd

Modern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com

Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $48M in backing from YC, Benchmark, Altimeter, and angel investors like Paul Graham and Jessica Livingston.

You might have seen some of our content on HN, like "Adding Optimistic Locking to an API": https://news.ycombinator.com/item?id=28314623 We work on fun, hard problems like this that help the most innovative companies in the world grow faster.

If this sounds interesting to you, send me an email. I'm matt (at) moderntreasury (dot) com. Or apply on our jobs page https://www.moderntreasury.com/careers?utm_source=yYPEbOqnBd

Modern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | moderntreasury.com

Modern Treasury is a money movement platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $48M in backing from YC, Benchmark, Altimeter, and angel investors like Paul Graham and Jessica Livingston.

You might have seen some of our content on HN, like "Adding Optimistic Locking to an API" last week: https://news.ycombinator.com/item?id=28314623 We work on fun, hard problems like this that help the most innovative companies in the world grow faster.

If this sounds interesting to you, send me an email. I'm matt (at) moderntreasury (dot) com. Or apply on our jobs page https://jobs.ashbyhq.com/moderntreasury?departmentId=ee54bd6...

We just started using Mozart at Modern Treasury (S18), and have been really happy so far. We didn't want to spend a ton of time setting up data tooling, so we liked that we could use Mozart to get up and running really fast. All we've had to do is write our transforms, and things like snapshotting, scheduling, etc are taken care of for us. Pete, Dan, and team have been really responsive to our questions and good partners. At first I was a bit skeptical and we were just going to do Snowflake+Fivetran ourselves. But after talking to some of their larger customers, I was convinced that (a) it would save us time and (b) it could scale with us.

Ruby 2.7 7 years ago

I'm most excited for Enumerable#tally for counting occurrences of elements.

From the example in the release:

  ["a", "b", "c", "b"].tally
  #=> {"a"=>1, "b"=>2, "c"=>1}
There's more about this change here (https://medium.com/@baweaver/ruby-2-7-enumerable-tally-a706a...). I probably do this a few times a week:
  list.each_with_object(Hash.new(0)) { |v, h| h[v.something] += 1 }

I find it interesting the recent rapid rise of ISAs. I remember back in 2013/14, hearing Upstart pitch to my college for their ISA program. From what I recall, their pitch fell mostly on deaf ears. You can still see their ISA agreement online funnily enough: https://www.upstart.com/funding_terms But they discontinued it in 2014: https://slate.com/business/2014/05/upstart-pulls-income-shar...

It's not clear to me why the market pull for ISAs has grown so much recently, although I am happy to see it as an alternative to debt. Perhaps it's the increasing student loan debt burden in the US? Perhaps capital markets opening up to ISAs as an investment vehicle as well?

Hey there - author of the article here.

Like some of the other comments said, ACH payments are handled by a middle man(The Clearing House/FedACH). In terms of speed, this is what their current guidance is:

"Specifically, the Nacha Operating Rules require that ACH credits settle in one to two business days and ACH debits settle on the next business day. Recent enhancements to the Nacha Operating Rules now enable same-day settlement of virtually all ACH transactions."

(https://www.nacha.org/news/what-ach-quick-facts-about-automa...)

For what you're asking about with check reversals, there are protections that let you challenge payments after they have "cleared". ACH payments from individuals can be challenged for up to 60 days and for businesses, up to 3 days (although sometimes banks will let you do it beyond that window).

ACH is built to be reversible. If you want avoid that, you can use wires or (soon) RTP.

I believe that Palantir thinks they can scale their business in a way traditional consulting firms cannot. Since they have pretty powerful data and software tools, they can actually reduce the cost per client as their client base grows. Going public could give them more access to capital to keep growing, which they should do if their economic model scales.

Hey everyone, I wrote this post for the LendingHome blog. I hope you all find it helpful!

It can be difficult to distill comprehensive tips for body health into a short post, so feel free to post any questions you might have. I'd be happy to make recommendations or clarify any points from the post. :)