Field Notes · The Build Log

Building Plunkx in public

A weekly review, posted most Fridays. What we ship, what breaks, and why we change our minds — building the foundation the dive industry gets to stand on.

Week 18Friday, Jul 3

A softphone, an assistant, and six months in→

The shop phone system, inside the app. A native AI assistant. A whole website built end to end by machine. And a look back at half a year.

APIPOS appAIAutonomy
Week 17Friday, Jun 26

Commerce goes live-adjacent→

A real payments engine - deposits, installments, refunds, store credit - and a bridge to pay a year of legacy invoices through the new system.

APIMars Scuba appCommerce
Week 16Friday, Jun 19

Admitting the API needed a rewrite→

When your own API is misinforming you, it is time. We started v2 and began strangling v1 - plus a catalog rebuilt from the source.

APICatalogPOS v2Plugin
Week 15Friday, Jun 12

The POS app, and Brand Manager→

A native point-of-sale for shop staff - and the week the platform stopped being only about one dive shop.

POS appAPIBrand Manager
Week 14Friday, Jun 5

Real payments, and rows that vanished→

Native in-app checkout - and a tenancy bug where rows silently disappeared the moment we turned on the security meant to protect them.

Mars Scuba appiOS appAPISecurity
Week 13Friday, May 29

The Merge→

Five apps became one. We ripped auth out mid-flight, and a single environment variable held a login loop hostage for a morning.

Mars Scuba appAPIPlatform
Week 12Friday, May 22

An AI door, and a watchtower→

An MCP server so an agent can actually do things - and monitors that drive the real product, not just ping a URL.

APIAIStatus
Week 11Friday, May 15

Roles that provision themselves→

Flip a flag on, and the platform creates the profile rows and texts the person to tell them.

APILoginiOS app
Week 10Friday, May 8

Firebase, gear lockers, and the service desk→

The heaviest week of the spring. Three hard things at once - and a Bluetooth bug that ate an evening.

APILoginiOS appAuth
Week 9Friday, May 1

The API is born→

From a commit named "First Push" to a real /v1 surface in five days. The platform started eating its parents.

APITravelPlatform
Week 8Friday, Apr 24

Two products in one week→

Ambitious to the point of reckless: the customer iOS app got its first commit and the site grew a real enrollment wizard, in the same seven days.

iOS appMars Scuba siteLogin
Week 7Friday, Apr 17

The tenant database→

The most important week of the spring, and it is only three commits, because the important part was a decision.

LoginMars Scuba siteMulti-tenant
Week 6Friday, Apr 3

Supabase had to go→

Convenience stopped being worth the ceiling. So we tore the store off Supabase and put it on Postgres.

LoginMars Scuba siteDatabase
Week 5Friday, Mar 27

One commit→

Sometimes the honest weekly review is: thought hard, typed little.

Login
Week 4Friday, Mar 20

Login gets its own house→

The moment you decide accounts are their own service, you have quietly admitted you are building a platform.

LoginArchitecture
Week 3Friday, Mar 13

Photos and formatting→

Not every week is a milestone, and I am not going to pretend this one was.

Mars Scuba site
Week 2Friday, Mar 6

The recruiting funnel→

A whole week on one page - "Become a Pro" - and the first time the project touched a real database.

Mars Scuba siteDatabase
Week 1Friday, Feb 27

Week one→

Every big system starts as a small, embarrassing one. This week that is a public programs page for a single dive shop.

Mars Scuba siteGenesis
ManifestoThe mission

The foundation dive shops deserve→

Dive centers run the most demanding retail-plus-service-plus-education business on earth on a Frankenstein stack of six disconnected tools. We are here to replace all of it with one.

ManifestoWhy
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