ICT-Platform Dev Specialist FA case studies
ICT-Platform Dev Specialist FA · Put your knowledge to work in context.
The ICT-Platform Dev Specialist FA is a multiple-choice certification aimed at developers who build and operate shared application platforms rather than single-purpose apps. It suits engineers who already write code and now need to reason about the platform layer: service architecture, data storage choices, API contracts, deployment pipelines, identity and access, and the observability that keeps a platform trustworthy. The ICT-Platform Dev Specialist FA case studies are 5 cases and about 6,312 words.
1Decomposing a Locked-Down Order Monolith Before Peak Season
Northwind Supply runs a 1.4M-line order-management monolith against one PostgreSQL 14 cluster (6 TB) used by 11 product teams. Deploys happen twice weekly inside a 5-hour Saturday window; a failed deploy in March left the platform read-only for 90 minutes.
1,153 words, about 6 min2Node.js Service That Leaks Memory Every 26 Hours
Ledgerly's notification-orchestration service runs on Node.js 20 in 8 pods behind a load balancer, serving 1,900 requests/second at peak. Resident memory on every pod climbs from roughly 420 MB to 1.9 GB over about 36 hours, then the container is OOM-killed; the cycle used to take 40 hours and now takes 26.
1,186 words, about 6 min3Partitioning a 940-Million-Row Multi-Tenant Invoice Table Online
PayTrack's billing platform stores invoices for 4,200 tenants in a single PostgreSQL 15 database. The invoice line table holds 940 million rows and grows by about 25 million per month.
1,378 words, about 7 min4Partner API With Duplicate Shipments, Out-of-Order Webhooks, and a Required Field
Horizon Freight exposes a REST API to 260 logistics partners and recently added webhooks. Partners poll GET /v1/orders?offset=N&limit=100 over a 2.1 million-order dataset; several report missing orders and make 40-60 calls per full sync.
1,237 words, about 6 min5Alert Fatigue, a Metric Cardinality Explosion, and a Cascading Timeout
Sentinel's payments platform carries a 99.9% monthly availability SLO on the checkout API. On-call receives about 420 alerts per week and 91% are judged not customer-impacting; the loudest are CPU 80% threshold alerts across 40 pods.
1,358 words, about 7 min