AI-Graded Content Validation
Large question banks authored by multiple sources (human or AI) accumulate factual errors that are invisible to structur...
Certification
28 lessons
Lessons
Answer Position Bias
When humans author multiple-choice questions, the correct answer tends to cluster in certain positions (often B or C). T...
Building a Codebase Review Skill
A structured review skill turns the ad-hoc "look at this code and tell me what's wrong" request into a repeatable, evide...
Building a Lessons Skill for Claude Code
A Claude Code skill file is a structured prompt that turns a repeatable workflow into a single slash command. The skill'...
Building a Phase Execution Skill
A phased plan is only as good as its execution discipline. A /phase skill automates the mechanical parts of plan executi...
Bulk Metadata Enrichment Scripts
When hundreds of data records need the same type of update (adding titles, categories, tags, or enriched descriptions), ...
Client-Side State Persistence with localStorage
localStorage can serve as a full persistence layer for client-side applications when the data is user-specific, the data...
Code Review Driven Remediation
A whole-codebase code review is only as valuable as the remediation that follows it. The review itself produces a findin...
Content Quality Auditing at Scale
When you have hundreds or thousands of content items authored by different sources at different times, quality varies wi...
Content Security Policy for Static Sites
A Content Security Policy (CSP) is achievable on a static site without server-side headers by using a <meta> tag. The ch...
Design System Migration
Migrating an existing multi-page site to a design system is a page-by-page operation, not a big-bang rewrite. The design...
Design-First Development
Writing a design document and a Physical Design Requirements (PDR) document before coding catches architectural mistakes...
Equivalence Testing During Format Migration
When migrating a data format (XML to JSON) that feeds a rendering pipeline, the only way to prove the migration is corre...
Hint Quality as a Spectrum
A progressive hint system (brief nudge → full explanation → deep-dive knowledge) is more pedagogically effective than a ...
Integration Testing a DOM Application with jsdom
A browser-based application that uses DOM APIs (querySelector, innerHTML, addEventListener) can be integration-tested in...
Legacy Artifact Removal
After a migration, the old system's artifacts (files, code, tests, scripts) must be actively removed in a deliberate cle...
Lessons Learned as a Practice
Systematically extracting lessons from project work — and writing them as standalone documents — turns ephemeral experie...
Phased Release Planning
Breaking large features into ordered phases — each independently shippable, each ending with a commit — transforms ambit...
Provider-Agnostic Plugin Architecture
When a system needs to support multiple "providers" (vendors, brands, data sources) that share the same behavior but dif...
Scaling Content Without Scaling Complexity
Adding 50+ exams across 10 providers to a quiz application required zero changes to the core quiz engine, data loader, o...
Schema Enforcement at the Data Layer
Adding runtime schema validation to your data loading layer catches entire categories of bugs that would otherwise surfa...
Schema Variant Consolidation
When multiple people or processes author data files for the same system without a shared schema, variant schemas emerge....
Static Site as Application Platform
A full-featured application (quiz engine, progress persistence, scoring, results dashboards, 10 providers, 50+ exams) ca...
Testing Provider Detection Logic
When critical logic is embedded in a class that's hard to test (DOM-coupled UI class), developers sometimes copy the log...
Verbatim Answer Leakage in Hints
When hints contain the exact text of the correct answer choice, they short-circuit learning. The learner reads the hint,...
XML Entity Encoding Pitfalls
XML entity encoding bugs (Q&A vs Q&A) are the most common class of data corruption in XML content pipelines. They're...
XML to JSON Migration
When migrating a live data format (XML to JSON), the key risk is not the conversion itself — it's proving that the new f...
XSS in Trusted-Data Applications
Using innerHTML to render content from "your own" data files (XML, JSON, markdown) is an XSS vulnerability even when the...