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AWS Infrastructure for Agent-Based Payment Systems: State, Idempotency and Failure Handling

3d ago · 5 min read · The infrastructure that handles human-initiated payments breaks in a specific way when you hand control to an agent. Here's what changes, and why it matters before you find out in production. Most pay

The Architecture That Got You to Series B Will Not Get You to Series C

Mar 15 · 6 min read · AWS's Well-Architected Framework makes an observation that doesn't get enough attention outside of technical architecture circles. Most system failures at scale are not caused by bad engineering. They

The Engineering Decision That Seems Small and Costs £40,000

Mar 14 · 5 min read · Nobody sets out to make a £40,000 mistake. The decision that costs £40,000 looks, at the time it's made, like a reasonable call under time pressure. An engineer with solid instincts and not quite enou

Why Payment State Is the Hardest Problem in Distributed Systems

Mar 8 · 7 min read · Most engineering teams underestimate payment state until it bites them. Not during the build. During the build, managing payment state feels straightforward. A payment is initiated, processed, confirm

The Microservices Mistake That Quietly Kills Fintech Engineering Velocity

Mar 7 · 6 min read · There's a pattern I see repeatedly when reviewing cloud architecture for early-stage fintech companies. A team of 10–15 engineers. Series A funded. Processing payments, handling reconciliation, managi