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Notes from building commerce operations software

Mostly about the unglamorous parts: reconciling payouts, keeping stock honest, and why a number you cannot explain is worse than no number at all.

AllOperationsFinanceEngineeringProductMessaging
Finance21 August 2026 · 8 min read

The margin you report is not the margin you keep

Payment fees, return shipping and the cost of the box are all real, and none of them appear in your storefront's revenue figure. A walk through what to subtract, in what order, and why the answer changes which products you should promote.

By Amara Osei

Operations11 min read

Why your inventory count drifts, and how a ledger fixes it

A stock number is a conclusion. Storing only the conclusion means that when it is wrong, nobody can explain why. Storing the movements instead turns a mystery into an audit.

Jonas Weber14 August 2026
Engineering9 min read

Rate limits are not an error state

Every marketplace API will throttle you. Treating that as a failure produces alert fatigue and lost orders; treating it as backpressure produces a system that degrades gracefully. What that looks like in practice.

Diego Reyes7 August 2026
Product6 min read

Return reason codes are the cheapest product research you will ever run

Customers tell you exactly what is wrong with a product when they send it back. Most sellers throw that away. Six codes, applied consistently, will change what you stock next quarter.

Priya Sharma31 July 2026
Finance13 min read

What we learned reconciling 40,000 marketplace payouts

Settlement reports disagree with order totals more often than you would hope. The three most common causes, and how to tell a rounding difference from a genuinely missing payment.

Sofia Rossi24 July 2026
Operations10 min read

Forecasting demand without a data science team

Seasonality, trend and lead time get you most of the way. A plain explanation of what a reorder point actually is, why safety stock is not padding, and when to distrust the model.

Amara Osei17 July 2026
Messaging12 min read

One inbox, seven channels: what actually breaks

Unifying customer conversations sounds simple until you meet WhatsApp's 24-hour window, Instagram's app review, and SMS opt-out law in four jurisdictions. An honest account.

Diego Reyes10 July 2026
Engineering9 min read

The case against a single 'source of truth'

Marketplaces own their order data and always will. Pretending otherwise produces sync loops and lost writes. What it means to be authoritative about some things and deferential about others.

Jonas Weber3 July 2026
Operations7 min read

Pricing a bulky product when shipping decides the margin

For anything over two kilos, the carrier rate is the pricing decision. How to build a rate rule that stops your rate shopper picking express for a cushion.

Priya Sharma26 June 2026

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