Security Basics Every Backend Developer Should Practice by Default

Cybersecurity is a big part of why I find backend work interesting, but most real-world vulnerabilities I've seen aren't exotic — they're skipped basics.

Parameterize everything, no exceptions

SQL injection is a solved problem, and it still shows up because someone concatenated a string "just this once":

// Never
DB::select("SELECT * FROM users WHERE email = '$email'");

// Always
DB::select('SELECT * FROM users WHERE email = ?', [$email]);

Laravel's query builder and Eloquent do this for you by default — the only way to get injection is to actively opt out with raw string concatenation.

Validate on the server, not just the client

Client-side validation is a UX feature, not a security control. Every Form Request rule needs to exist and be enforced server-side, because the client you built is not the only client that will ever call your API.

Least privilege for service accounts and API tokens

A token scoped to exactly what a job needs — read-only, single-domain, time-limited — turns a leaked credential from an incident into a non-event. This is easy to skip when a project is small and painful to retrofit once it isn't.

Log security-relevant events, not just errors

Failed logins, permission denials, and rate-limit hits are the events that let you notice an attack in progress instead of reconstructing one after the fact from access logs alone.

None of this is advanced. All of it is the difference between "we have security" and "we haven't been tested yet."