Dan Petrescu
Case studies

Case studies

Long-form write-ups: the constraint, the option we rejected, what shipped, the numbers, and what I'd do differently.

foiparcursonline.ro

Replacing data entry with receipt scanning, from zero to app-store launch.

iOS + Android

launched in both stores

0

receipt fields typed by hand

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CODCheck

A Shopify app that scores cash-on-delivery orders for fraud risk and hides COD from risky buyers, cutting refused deliveries by 30–50%.

30–50%

fewer refused deliveries

0–100

automated risk score

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Waave

Getting a taxi meter app NTEP-certified in the US, then auditing and migrating the AWS account for investor due diligence.

<0.1%

measurement error, certified

NTEP

National Type Evaluation Program certification

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Taxi platform

Validating a fare algorithm against Romanian regulation, and designing call masking on Amazon Connect for a taxi platform with over 1M users.

1M+

users on the platform

≤0.45 lei

fare deviation across reference rides

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Shopify e-commerce, 10+ stores

What repeats across ten-plus Shopify stores — print on demand, beauty, gifts — and the three things that decided whether they made money.

10+

Shopify stores built and run

3

verticals: print on demand, beauty, gifts

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AI agents in production

Four shipped agent systems — voice calls, dispatch, AI-search visibility, and a multi-agent dev team — and the rule that decided where agents were allowed to act.

4

agent systems live in production

0

operators in the loop for routine dispatch

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Car sharing with Citylink

Handing strangers the keys to a car: production KYC, Bluetooth unlock with an audit trail, and OBD2/CAN telemetry from day one.

2

platforms: HipCar and Citylink

0

unlocks without a server-side audit record

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Bike sharing — the Citylink MVP

Citylink started as a bike-sharing MVP: the cheapest possible way to prove people would unlock a shared vehicle with a phone.

MVP

bikes before cars

Bluetooth

unlock mechanism that carried over

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Ride sharing across two markets

Driver KYC on HipCar in Moldova, an NTEP-certified meter at Waave in New York, and what transfers between the two — and what does not.

2

countries: Moldova and the US

<0.1%

certified meter error at Waave

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