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How to Convert CSV or Excel to a NACHA ACH File — and Validate It Before Upload

How to Convert CSV or Excel to a NACHA ACH File — and Validate It Before Upload

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7 min read
Custodial ETH withdrawals: the nonce is a database row, not a node call

Custodial ETH withdrawals: the nonce is a database row, not a node call

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7 min read
Getting Paid Faster Starts Before You Send the Invoice

Getting Paid Faster Starts Before You Send the Invoice

Comments 3
2 min read
A Small Fintech Challenge, and Why I Let Postgres Hold the Money

A Small Fintech Challenge, and Why I Let Postgres Hold the Money

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4 min read
The only safe failure state for an outbound payout is unknown

The only safe failure state for an outbound payout is unknown

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6 min read
Expense Report Fraud Detection: The Altered Receipt PDF Your Controls Never Inspect

Expense Report Fraud Detection: The Altered Receipt PDF Your Controls Never Inspect

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12 min read
Look up Irish companies (CRO) in one API call

Look up Irish companies (CRO) in one API call

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4 min read
Moving Carefully and Proving It: The Reality of Scaling Fintech Infrastructure

Moving Carefully and Proving It: The Reality of Scaling Fintech Infrastructure

Comments 2
6 min read
Building The Apex Calc: A Fast, Ad-Free Financial & Amortization Utility

Building The Apex Calc: A Fast, Ad-Free Financial & Amortization Utility

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1 min read
The Guard That Counts the Wrong Thing

The Guard That Counts the Wrong Thing

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4 min read
The Permanent Halt That Lasts Until the Next Restart

The Permanent Halt That Lasts Until the Next Restart

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4 min read
Plantation Mortgage-Backed Securities: Evidence from Surinam in the Eighteenth Century

Plantation Mortgage-Backed Securities: Evidence from Surinam in the Eighteenth Century

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8 min read
Apple Pay Token Decryption vs Google Pay ECv2

Apple Pay Token Decryption vs Google Pay ECv2

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3 min read
I spent three months building Stripe for Nepal, alone

I spent three months building Stripe for Nepal, alone

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10 min read
I benchmarked 6 free exchange rate APIs for 30 days. Here are the numbers.

I benchmarked 6 free exchange rate APIs for 30 days. Here are the numbers.

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Comments 1
4 min read
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