Field notes from the build

A product engineering blog for software that must work

Concrete lessons from production MVPs, rescue work, payments, AI-built apps, and white-label delivery. Written by the people doing the engineering.

Read the latest Start a project

First four guides

Start with the problem in front of you

9 min readJuly 19, 2026

Guide 01

Why your Lovable app's payments look successful but record nothing

A practical diagnosis for Lovable app broken payments where Stripe charges the customer but no order, subscription, or database record appears.

Read the guide

10 min readJuly 19, 2026

Guide 02

What to do when your AI-built app breaks in production

A calm production triage plan for deciding whether to repair or rebuild an AI-generated app made with Lovable, Bolt, v0, or similar tools.

Read the guide

9 min readJuly 19, 2026

Guide 03

White-label development: how agencies ship without hiring engineers

How to choose and run a white label development partner for agencies, including scope, NDA, margins, client communication, delivery, and handover.

Read the guide

10 min readJuly 19, 2026

Guide 04

How much an MVP really costs in 2026: our fixed prices explained

A concrete 2026 MVP cost guide covering HyperBrain Labs' $3,999 Production MVP, custom fixed quotes, retainers, scope, ownership, and third-party costs.

Read the guide

A product engineering blog for software that must work

Start with the problem in front of you

Why your Lovable app's payments look successful but record nothing

What to do when your AI-built app breaks in production

White-label development: how agencies ship without hiring engineers

How much an MVP really costs in 2026: our fixed prices explained

Have something to build?