Design / 012
Open / Closed Principle
Designing for extension without reopening stable code.
Engineering notes · since 2008
Ideas engineered for the real world.
Software engineering, architecture, systems, code, and production lessons — a long-running record of what survived contact with reality.
Featured article / SOLID
Single Responsibility Principle
Only one reason to change.
public class ReportService
{
private readonly ICache _cache;
private readonly ILogger _logger;
public Report Get(string id)
{
return _cache.Get(id);
}
}
{
private readonly ICache _cache;
private readonly ILogger _logger;
public Report Get(string id)
{
return _cache.Get(id);
}
}
Data / 018
SQL Server Performance Notes
Indexes, plans, statistics, and query behavior observed under production load.
Systems / Archive
Linux Systems Archive
Command-line operations, scripts, migrations, and infrastructure lessons preserved in context.
Architecture / 016
System Design Lessons
Tradeoffs that only become visible after software meets scale and time.
Archive timeline
18 years of engineering notes.
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