Principles
How I think about building
An engineering philosophy, written down. These principles were earned through incidents, reconciliations, and years of watching what actually keeps systems, and teams, trustworthy.
Reliability is a feature
In financial software, uptime isn't an operational metric, it's the product promise. A payment system that works 99% of the time is a payment system that betrays one customer in a hundred. I design, staff, and prioritize as if reliability were the flagship feature, because to the user, it is.
Build for failure
Every external call will eventually time out. Every queue will eventually back up. Every third party will eventually have their worst day on your busiest day. I build systems that expect this. Idempotent operations, reconciliation loops, graceful degradation. Failure becomes a handled case, not a crisis.
Simple beats clever
The system that survives is the one the newest engineer on the team can reason about at 2 a.m. during an incident. Cleverness optimizes for the author; simplicity optimizes for the decade. When I have to choose, I choose the boring design that cannot surprise us.
Trust compounds
Users extend trust one successful transaction at a time, and withdraw it all at once. The same is true inside teams. Consistency in small commitments earns the credibility to make big changes. I treat both kinds of trust as the scarcest resource I manage.
Users remember outcomes, not architecture
Nobody has ever thanked us for an elegant service boundary. They remember that the card worked at the checkout, that the transfer arrived before the deadline. Architecture is a means. I evaluate every technical decision by the outcome it protects.
Make the invisible visible
Money systems fail silently unless you force them not to. Ledgers must balance provably. Discrepancies must alert loudly. Dashboards must show what's true, not what's convenient. If we can't see it, we can't be trusted with it.
Grow engineers, not dependencies
A team that needs its lead for every decision has a single point of failure. Me. My job is to transfer judgment. Context over instructions, principles over rules, questions over answers. Success is when the team makes the call I would have made, without me in the room.
Write it down
Decisions without documents become folklore, and folklore becomes bugs. Design docs, incident reviews, runbooks, ADRs. Writing is how engineering organizations remember. It's also how they think.