Seventeen years running field inventory, billing, and compliance out of databases I built myself — for oilfield service operations where a lost sack or a wrong line on an invoice was real money. I do the same work now as data analysis: records cleaned, reconciled to the penny, and shown in dashboards a person can judge at a glance.
This is the front room. The work is below; the rest of the house is in the menu — Bio, Contact Info, Links, Pics, and a Junk Drawer.
Software — built and published
FleetSheet
A one-desk equipment tracker with compliance checks and invoicing / accounts receivable, built with Python and MySQL for the small rental shop — every unit in the yard, every expiration date, every open invoice, on one screen. Free, published, and in its second year of releases. Track your equipment to the bank.
Dashboard — Tableau Public
Tiger Bullets Program, 2009–2013 — Field Inventory & Billing
A lost-circulation-material program run in the field, reconstructed from the original tickets and invoices. A documented sample, verified ticket by ticket: 55,155 sacks delivered · 1,378,875 lbs · $1,705,902 invoiced · 227 wells · 251 of 251 tickets signed.
Dashboard — Power BI
Job-Cost Ledger — Documented Sample
Job-cost paperwork from oilfield service work, rebuilt as a working ledger and an interactive dashboard: 5,116 line items · $1,433,884 across 92 projects · Oct 2011 – Dec 2014. Steel, Electrical, and Consumables account for 67% of all documented spend, and 99.78% of the lines carry a full paper trail — purchase order, vendor invoice, and delivery ticket.
Case study — documented sample
Asset Register
527 assets tracked across five operating sites, with certifications and due dates — written up with the job-cost ledger as short case studies: problem, build, impact.