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Systems Architecture Field Notes Series' Articles

Back to Kingsley Onoh's Series

Mar 4

How a 58-Table Subscription Crashed the Entire Replication Cluster

#postgres #database #devops #backend

4 min read

Mar 4

Why the Pricing Algorithm Has Two Completely Different Strategies for Rank 1

#python #algorithms #ecommerce #backend

5 min read

Mar 4

Why I Run the Entire Pipeline Twice to Match Products

#python #ecommerce #shopify #backend

5 min read

Mar 4

Why I Split Minutes Prediction Into Two Models Instead of One

#architecture #data #datascience #machinelearning

6 min read

Mar 22

The Matching Problem No One Talks About

#go #reconciliation #scoringalgorithms #datamatching

4 min read

Mar 30

I Built a Knowledge Graph Into the Retrieval Pipeline and Then Dropped It in Production

#rag #hybridretrieval #knowledgegraph #neo4j

5 min read

Apr 9

Why I Designed the Whole System Around Kafka and Then Deployed Without It

#typescript #fastify #kafka #websocket

6 min read

Apr 18

Why I Compute Every Appointment Slot from Scratch on Every Request

#healthydebate #scheduling #python

6 min read

Apr 18

Why Extracted Obligations Never Activate Themselves

#statemachine #dotnet #domainmodeling

6 min read

Apr 18

The Compliance Problem That Disappears When You Stop Updating Rows

#eventsourcing #postgres #immutablitiy

6 min read

Apr 18

Why the PO Resolver Has Five Strategies, Not One Algorithm

#kotlin #matchingalgorithms #exposed

8 min read

Apr 18

Building a DAG Orchestrator That Rewrites Its Own Execution Plan

#dag #python

6 min read

Apr 18

I Spent a Week Securing Webhook Ingestion. The Real Attack Surface Was Delivery.

#security #ssrf #webhook

6 min read

Apr 18

Why Anomaly Detection Can't Block the Ingestion Pipeline

#rust #async #tokio

6 min read

Apr 18

Stripe Said Past Due. The State Machine Said No. Both Were Right.

#stripe #elixir #webhook

6 min read

Apr 26

The Signing Bug You Cannot See Until a Tenant Tries to Verify You

#hmac #cryptography #webhooks #typescript

6 min read

Apr 26

The Cursor Pagination That Worked Until Five Rows Shared a Timestamp

#postgres #pagination #drizzle #precision

6 min read

Apr 26

The Per-Tenant Rate Limit That Wasn't Per-Tenant

#fastify #ratelimiting #multitenant #plugins

6 min read

Apr 26

Why I Refused to Re-Query the Tenant Row at Alert Dispatch Time

#ruby #rails #audittrails #jsonb

7 min read

May 5

Why I Made the Ledger Refuse Single Rows

#fsharp #ledgerdesign #domainmodeling #postgres

6 min read

May 6

Why I Made WebSocket Delivery the Disposable Part of the Tracking System

#eventsourcing #redisstreams #websocket #typescript

6 min read

May 6

Confidence Is Not Ownership

#clojure #correlation #financeoperations #tenantisolation

6 min read