1.44M
lines of my own code
Jeffrey Jorgensen · backend engineer
Systems where the money has to add up.
Custodial wallets, multi-chain payouts and double-entry ledgers, taken from database schema to production. Every figure is dimensioned — it carries its source, its network and the instant it was taken. For payment companies, marketplaces and fintech teams whose numbers have to reconcile, and currently don't.
Reconciliation — the equation that must hold
12,967
external out
−
487
fees
−
31
gas
=
Δ chain
on-chain holding
Internal transfers excluded — they must sum to 0.00 across the system. Each term computed separately, so a discrepancy points at where to look rather than merely existing.
Schedule of quantities — measured from my own repositories, 01·09·2026
18,000
automated tests
351K
lines of production Go
4
blockchain rails in production
5,906
commits, mine alone
2
products on one accounting core
3 yrs
in daily production, one engineer
25
repos with an orientation doc
Sheet 02 — Parts list
Three kinds of problem, one requirement
All three share the same constraint: a number in the system has to be defensible — traceable to where it came from. That constraint is what I'm good at.
P-1
Payments
Rails & custodial wallets — receiving with source attribution across many addresses, batch payouts to hundreds of recipients, recurring debits, screening on the way in.Bitcoin · Ethereum · Tron · TON · signing keys isolated from the app
P-2
Ledgers
Double-entry accounting cores — the system of record under a wallet, exchange or marketplace balance: accounts, postings, holds, reconciliation, fees, audit trail.Decimal money, never floats · reconciliation against the chain · every balance traces to its postings
P-3
Documents
Financial data pipelines — bank statements, invoices, receipts and tax forms turned into decisions, not just extracted fields.PDF · OCR scans · spreadsheets · XML · output back into CRM, sheets or a filing package
Sheet 03 — Where to look next
Two ways to check my work
Sheet 04 — Ways in
Tell me what's breaking.
Thirty minutes, no preparation needed. You describe what happens today and what should happen instead; I tell you whether I'm the right person for it — including when the answer is no.
$1,800
Fixed-price audit · five working days · yours to keep, no obligation
from $14,000
One hard component — a ledger, a payout flow, a document pipeline
from $35,000
The whole system — schema, backend, interface, deploy, monitoring