C4 model
C4 model of a food-delivery platform
Who uses Forkway, the containers inside it, and the parts of its order and dispatch services.
Architecture you can walk through.
Interactive maps, each built on a real model.
Drill in, step between states, and play a flow end to end.
Popular tags
34 maps
Architecture
How systems are built and what they’re made of.
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C4 modelC4 model of a monolith carved into services
A Rails monolith becomes five services over three years, drawn as C4 containers on one frame.
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C4 modelC4 model of a messaging API, all four levels
One drill through all four C4 levels: the system, its containers, the rate limiter, and the token bucket’s code.
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Architecture reviewArchitecture review of a health plan’s prior-auth API
A health plan’s prior-auth API through architecture review: its patterns, eight findings pinned in place and the conditions of approval.
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Business capability mapBusiness capability map of an energy utility
Twenty-eight capabilities, the same grid by maturity and by spend, and the apps behind asset management.
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Enterprise reference architectureEnterprise reference architecture of an airport group
An airport group’s systems on one layered frame: a late flight traced through them, each block marked in place, partial or a gap, and the plan to 2028.
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Enterprise reference architectureEnterprise reference architecture of a city
A city’s digital services on one layered frame: a pothole report traced through it, where residents’ personal data lives, and who runs each block.
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Application rationalizationApplication rationalization after a credit union merger
Two credit unions’ 32 systems in one capability grid, stepped down to one system per capability by 2028.
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Integration landscapeIntegration landscape of a medical supply distributor
A medical distributor’s systems and hubs: how each connection moves, a late stock file, and the move from SAP ECC to S/4HANA.
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Data lineage mapData lineage map of a hotel group
A hotel group’s lakehouse: RevPAR traced to its source columns, guest data by classification, and a legacy job’s impact.
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IT/OT architectureIT/OT architecture of a food plant
The Purdue model in one frame: corporate IT, a DMZ with five conduits, and a bakery down to its burners.
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AI governance mapAI governance map of a mobile carrier
Seven care agents: the data each can reach, who approved them, and the guardrails on credits and refunds.
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VDI architectureVDI architecture of a hospital
A hospital’s 3,800 clinicians on Horizon desktops: the path from a ward’s thin client to the EHR, the shift-change rush, and a pod failing over.
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Modernization roadmapMainframe modernization of a pension administrator
A facade first, then one domain at a time: 1.4 million pension members move off a mainframe in three cohorts.
Security
What an attacker can reach, and the controls that close it.
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Threat modelThreat model of a payroll SaaS
A payroll SaaS’s data flows, twelve STRIDE threats pinned where they strike, and the control that closes each.
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Security reviewAzure security review and remediation
Six findings on a digital bank’s Azure estate, and the controls that close them in place.
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Attack path mapAttack paths into a research biotech
The paths into a research biotech’s crown jewels, the five-hop chain to cut first, and the fixes that close it.
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PCI scope mapPCI scope map of a cinema chain
How segmentation, P2PE and tokens shrink a cinema chain’s PCI scope from 20 systems to 6.
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Authorization boundaryFedRAMP authorization boundary of a government SaaS
A FedRAMP Moderate boundary on AWS GovCloud: encrypted data flows, interconnections, who owns each control and the POA&M.
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Identity blast radiusIdentity blast radius of a SaaS company
What one leaked credential reaches: a stolen laptop, a leaked CI token and a contractor nobody switched off.
Network
How sites, devices and segments connect.
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WAN modernizationWAN modernization of a restaurant chain
420 restaurants move from MPLS to SD-WAN and SASE, and the path from a store to Microsoft 365 gets shorter.
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Campus networkCampus network of a university
Five buildings on one core, every device by VLAN, and one closet down to its access points.
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Data center fabricData center fabric of a logistics company
Four spines and a leaf pair per row, what one failed leaf takes down, and one rack slot by slot.
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Layered network mapLayered network map of a broadcaster
One network from L1 to L4: cables, VLANs, routes and ports, and the conduit both “redundant” uplinks share.
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Network weathermapNetwork weathermap of a fiber ISP
A fiber ISP’s backbone with every link colored by load: the evening peak, new video caches, a fiber cut, and one street’s last mile.
Cloud
Where workloads run, and how they move.
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Cloud migrationData center to AWS migration
Three waves move an outdoor retailer’s apps from Denver into AWS. Step through and watch each one cross.
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Landing zone mapAzure landing zone map of a mining group
An iron ore miner’s Azure estate: guardrails pinned where they apply, owners and cost, and a hub with one bypass.
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Multi-tenant architectureMulti-tenant SaaS architecture on Oracle Cloud
A clinical-trials SaaS on OCI: shared rows for most sponsors, a database and key each for some, and one in its own network.
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Drift mapDesign drift map of a travel-booking site
A booking platform’s design, Terraform and Azure side by side: the drift a 2 a.m. hotfix left, and how it closed.
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Cloud network topologyAWS network topology of a payments fintech
Regions, VPCs and subnet tiers on a transit gateway hub, with a lens on what the internet can reach.
Process
How work moves through people and systems.
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Process mapAuto insurance claim process
Six stages from first report to recovery, then down into evaluation and the offer, lane by lane.
Operations
What depends on what, and what happens when it breaks.
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IT service mapHospital IT service map
Clinical services down to the apps and infrastructure under them, and what fails when the storage array does.
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Outage replayOutage replay of a stadium-tour on-sale
A big on-sale minute by minute: the seat database saturates, a waiting room goes on, and sales recover.
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Disaster recovery mapDisaster recovery map of a regional airline
Two Azure regions, what replicates, a failover rehearsal minute by minute and the five gaps it found.
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