APIs, databases, and the pipes that carry data.
Backend Systems
Modern password hashing in plain English. bcrypt, Argon2, salts, work factors, migration from legacy hashes, and the mistakes that get databases breached.
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Backend Systems
The protocol behind every third-party login button. Authorisation code flow, scopes, PKCE, and the small set of rules that make OAuth finally click.
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Backend Systems
Migrations from first principles to production deploys. Expand-contract pattern, team workflows, and the discipline that prevents database downtime.
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Backend Systems
JSON Web Tokens from first principles to a working ASP.NET Core 8 implementation. Includes refresh tokens, storage, and the security trade-offs.
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Backend Systems
Modern, safe PHP with MySQL. The PDO extension, prepared statements, password hashing, and the patterns every PHP project should follow.
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