Sohag Hasan (@sohag)

SHSohag Hasannotes.sohag.pro20h ago · 11 min read

I Built a Production Go Payment Ledger in 14 Weeks. Here's What I'd Do Differently.

Near the end of this build I did something I'd recommend to anyone who has just finished a big project and feels good about it: I handed the whole thing to a reviewer who had no stake in my feelings a

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SHSohag Hasannotes.sohag.pro1d ago · 11 min read

Approval Workflows and an Outbox Event Stream in Go: Eventing Without Kafka

The first time a bank made me wait, I was annoyed. I was trying to send a fairly large transfer, tapped confirm, and instead of the usual "done" the app said the payment was "under review." Nothing mo

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SHSohag Hasannotes.sohag.pro2d ago · 7 min read

Nested Accounts in a Go Ledger: Rolling Up Balances Without Storing One

Open any budgeting app and look at the summary screen. It says you spent 620 on "Food" this month. But you never made a payment to something called Food. You bought groceries, you got coffee four time

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SHSohag Hasannotes.sohag.pro2d ago · 9 min read

The Exchange Rate Was Hiding in an Environment Variable

Last week I sent a little money across a border. The app showed me a rate, I tapped confirm, and the euros landed a moment later. Out of habit I checked the rate against a search engine, and the app's

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SHSohag Hasannotes.sohag.pro3d ago · 12 min read

I Audited My Own Ledger Like a Fintech Expert. It Failed.

There is a specific kind of fear that shows up once a side project starts looking finished. The go-ledger has passed every test for months. Double-entry postings that sum to zero, idempotency keys, a

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Sohag Hasan

About

Available for

Sohag Hasan's blogs

Recently published

I Built a Production Go Payment Ledger in 14 Weeks. Here's What I'd Do Differently.

Approval Workflows and an Outbox Event Stream in Go: Eventing Without Kafka

Nested Accounts in a Go Ledger: Rolling Up Balances Without Storing One

The Exchange Rate Was Hiding in an Environment Variable

I Audited My Own Ledger Like a Fintech Expert. It Failed.

Sohag Hasan

About

Available for

Sohag Hasan's blogs

Recently published

I Built a Production Go Payment Ledger in 14 Weeks. Here's What I'd Do Differently.

Approval Workflows and an Outbox Event Stream in Go: Eventing Without Kafka

Nested Accounts in a Go Ledger: Rolling Up Balances Without Storing One

The Exchange Rate Was Hiding in an Environment Variable

I Audited My Own Ledger Like a Fintech Expert. It Failed.

Sohag Hasan

About

Available for

Sohag Hasan's blogs

Recently published

I Built a Production Go Payment Ledger in 14 Weeks. Here's What I'd Do Differently.

Approval Workflows and an Outbox Event Stream in Go: Eventing Without Kafka

Nested Accounts in a Go Ledger: Rolling Up Balances Without Storing One

The Exchange Rate Was Hiding in an Environment Variable

I Audited My Own Ledger Like a Fintech Expert. It Failed.

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Sohag Hasan

About

Available for

Sohag Hasan's blogs

Recently published

I Built a Production Go Payment Ledger in 14 Weeks. Here's What I'd Do Differently.

Approval Workflows and an Outbox Event Stream in Go: Eventing Without Kafka

Nested Accounts in a Go Ledger: Rolling Up Balances Without Storing One

The Exchange Rate Was Hiding in an Environment Variable

I Audited My Own Ledger Like a Fintech Expert. It Failed.