How does DevSecOps differ from the old "security team signs off at the end" model?
Quick Answer
DevSecOps distributes security into every stage as automated, developer-owned checks, instead of a manual gate a separate team runs at the end. It trades a single human sign-off for continuous, fast feedback.
Detailed Answer
The old model put a security review at the end of the cycle: code was written, then a separate team assessed a release candidate, often days before launch. Findings arrived when they were most expensive to fix and when the schedule pressure to ship anyway was highest.
DevSecOps keeps the same checks — SAST, DAST, SCA, secrets, policy — but automates them and moves them earlier, onto every commit, owned by the developers who wrote the code. Security specialists shift from being the gate to building the guardrails: writing the rules, tuning the thresholds, and handling the genuinely hard findings.
The tradeoff is real: automation catches known classes fast and cheaply but does not replace human judgement for business-logic flaws and threat modelling. Mature programs do both — automated gates on every commit, plus periodic manual review of the things machines cannot reason about.
Code Example
# Old model vs DevSecOps # security review at end -> checks on every commit # separate team owns it -> developers own it, security builds guardrails # findings late & costly -> findings early & cheap (shift left) # manual sign-off gate -> automated fail-fast gate + periodic manual review
Interview Tip
Frame it as "distributed and automated vs centralised and manual" — and admit automation does not replace threat modelling.