40 systems-design lessons
Filter by discipline, or browse all. Each article links through to the live Zuma module — or the Mr Bismarck webhosting billing platform — it's drawn from.
Marketplace
The Full Lifecycle of a Vehicle, One Marketplace
Buy, sell, value and service — why splitting these across apps breaks trust in high-value transactions.
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Marketplace
Renting a Home Without Paying a Viewing Fee to a Stranger
How structural escrow, not just verification badges, kills rental fraud.
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Marketplace
Escrow-Protected Listings: Checking the Title Before You Pay
Building buyer confidence into a category where fraud, not supply, blocks growth.
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Marketplace
Pricing a Skilled Trade Before the Technician Arrives
Upfront quoting logic that removes the haggling step entirely.
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Marketplace
Background Checks as a Product Feature, Not a Formality
Making vetting visible and verifiable to the person hiring, not just internal policy.
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Marketplace
Verifying a License Once, Trusting It Everywhere After
Building a credentialing layer that professionals only have to pass through once.
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Hosting providers, MSPs, data centres, and platform or marketplace businesses — anywhere billing, automation, payments or e-commerce logic needs to hold together at scale. Most of my clients are in East and Southern Africa, but the systems I build travel.
A short discovery call, a written scope covering the specific systems involved (billing, payments, automation, or e-commerce), then build in phases with checkpoints — so you see working software early, not just a plan.
Both. I run implementation and ongoing monitoring/support packages, particularly for data-centre and hosting-automation engagements — sized by server count, from small providers to enterprise data centres.
Remotely, primarily. Most engagements are scoped and delivered without needing to be on-site, though I'm based in Nairobi and can meet in person for clients in the region if that's useful for discovery or handover.
I built my own hosting billing platform, Imara Cloud, specifically because off-the-shelf billing tools don't close the gap between what's invoiced and what's actually provisioned. I can also work inside a client's existing stack when migration isn't practical.
Yes — M-Pesa, MTN MoMo, Airtel Money, Tigo Pesa, HaloPesa, Stripe and card rails, reconciled into a single ledger rather than left as six disconnected integrations. This is the same architecture behind Zuma's multi-currency wallet.
Yes. The ERP pattern behind Zuma — billing, inventory, logistics and support tied into one system of record — applies well beyond hosting, and I've used it for education, tourism and non-profit platforms too.
It starts with mapping which incident types are safe to automate versus which always need a human sign-off — the same L1/L2/L3 governance model behind AIOP. From there it's integration work against your existing panel (cPanel/WHM, DirectAdmin, Proxmox) and monitoring stack, not a rip-and-replace.
It depends on scope — a billing-automation fix is priced differently from a full multi-vertical ERP build. I scope and quote after the discovery call rather than off a fixed rate card, since the right structure (fixed-price phase vs. ongoing retainer) depends on what's being built.
Access to whatever systems are in scope (panel, billing platform, payment provider dashboards) and one point of contact who can make product decisions during the discovery phase. I'll flag anything else specific once the scope is clear.
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