Every engagement story in one place, in the order that teaches best. Start with the archetype problem, then the method under pressure, then the specialised builds — each one the same discipline pointed at a different costume of the same underlying issue.
The reading order
The Ledger Rebuild — the archetype. Books that drifted from the bank until nobody could say by how much, rebuilt as an append-only double-entry core with daily reconciliation. If you read one, read this: it contains the diagnostic method, the architecture and the parallel-run discipline that every other engagement here reuses.
The Zero-Downtime Migration — the method under maximum pressure. Years of live financial history moved without stopping the business, using dual-writes, verified batches and a comparator that held at zero before anyone said the word cutover.
The Reconciliation Engine — the cheapest intervention on this page. Month-end archaeology converted into a daily exception queue with reason codes, without rebuilding anything underneath. The right first step when a full rebuild is not yet fundable.
The Portfolio System and Risk Modelling — the quantitative pair. Event-sourced position truth with live profit and loss, and Monte Carlo simulation at GPU speed feeding value-at-risk fast enough to be used before decisions rather than after them.
The ERP Migration — the same migration discipline on a factory floor, staged so the plant never stopped and the registers retired module by module.
Growth Engagement 01 — the outlier: a search-and-content system rather than a money system, proven on a client before it became the marketing service sold here.
The through-line
Read as a sequence, one pattern emerges: immutable truth, projections computed on top, reconciliation always, and migrations that earn confidence through measurement rather than through argument.
Money, inventory, positions, matters, leads — the vocabulary changes and the discipline does not. Sab hisaab hai, and the same three questions decide every engagement: can the system prove what happened, can it be rebuilt from history, and does anyone check it daily.
How to read these as a buyer
Note what is marked and what is not. Where a figure is the client’s to share rather than mine, the page says so and offers a reference call instead of a number I cannot stand behind. That is a deliberate standard: no metric appears on this site unless it would survive a client reference call, and I would rather a case study read thin than read impressive and unverifiable.
If a case study anywhere on the internet reads suspiciously smooth, ask for the reference. I will offer mine before you have to.
What these engagements have in common at the start
Every one began with a version of the same sentence: the numbers do not match and we cannot explain why. Sometimes it was a ledger, sometimes stock, sometimes positions, once a pipeline — but the shape was identical, and so was the emotional texture: a competent team who had stopped being able to prove something they used to know.
That is worth saying plainly, because it is the condition this practice is built around. Not greenfield systems and not glamorous rewrites, but the specific situation where a business has outgrown the records it kept while it was growing, and the gap has become a meeting.
What they have in common at the end
A number nobody argues about, and a meeting that stopped existing.
Every one of these engagements deleted a recurring conversation: the month-end negotiation, the settlement argument with a partner, the Thursday dispute about issued gold, the quarterly brokerage disagreement. The technical result is a system; the felt result is a calendar with something removed from it, permanently, and a team that trusts its own numbers again.
Related reading
/services/fintech — the practice most of these come from · /services/delivery — diligence, rescues and migrations · /blog — the public method behind every engagement here
Bring your version
Every story on this page started with someone describing a mess they had stopped being able to explain. /contact — thirty minutes, and I will tell you which of these you are.