Sample deliverable

Sample Audit-to-Fix Report

What the Audit-to-Fix Package ($697) actually delivers — worked on a composite, fictional "Practice" feature for a kirtan-practice app, in the same Flutter + Node shape as the brief this service is built to answer.

No real client's code, name, or audit appears anywhere here — this is proof of the kind of work delivered, built independently to demonstrate it, not a leak of anyone's actual audit. Full source is public: sample-deliverable/ in the project repo.

Scope

A "Practice" feature: a user starts a timer, logs a kirtan practice session (raag, shabad, duration), and sees a day streak and weekly-goal progress. Built once correctly, then re-built the way real audits usually find things, then fixed — so every finding below is demonstrated in actual code and, on the Node side, an actual executed test.

Node backend findings

All 8 proven by one command — npm test runs 18 tests: one confirming each bug is real against the unpatched code, one confirming each fix holds. All 18 pass.

#	Sev	Finding	Fix
1	P1	Practice-day boundary computed from raw server UTC instead of the user's local timezone — a late-night session gets silently bucketed into the wrong day, breaking streaks for anyone not in UTC.	Computed from a client-supplied timezone offset.
2	P1	A second session on the same calendar day incremented the streak again instead of just extending that day.	Same-day sessions no longer re-increment; only a new calendar day does.
3	P1	No input validation on duration — a negative or NaN value was accepted and corrupted the user's running total permanently.	Rejected with a clear error before it touches any state.
4	P0	Lost-update race condition: two concurrent requests for the same user both read the same "before" snapshot — whichever write lands last silently overwrites the other's update, with no error and no log.	Per-user async lock serializes writes.
5	P1	No idempotency check — a client-side retry after a lost response created a fully duplicate session, double-counting minutes.	A client-supplied idempotency key dedupes retries.
6	P0 · security	IDOR — the "read a user's sessions" endpoint never checked the requester's identity against the target user.	Requester identity checked against the target user; unauthorized reads return 403.
7	P2	A weekly goal of 0 produced Infinity/NaN, sent straight to the client where the progress-bar widget would crash or render garbage.	Returns a safe "no goal set" result instead of a non-finite number.
8	P1	No error boundary around the async persistence call — a transient failure became an unhandled promise rejection, which under Node's default behavior can crash the entire process for every connected user.	Wrapped in try/catch; clean 400/500 responses, process stays up.

$ npm test
✔ 18 tests, 18 passed, 0 failed

Flutter client findings

Four classic, audit-worthy findings on the same screen. No Flutter SDK was available in the environment this was written in, so these were verified by careful manual construction plus an independent Dart/Flutter code review rather than a green CI run — stated plainly rather than glossed over.

#	Sev	Finding	Fix
1	P1	A practice-session Timer was started but never cancelled in dispose() — navigating away mid-session leaves it calling setState on a widget that no longer exists.	`_timer?.cancel()` added to dispose().
2	P1	No `mounted` check after an await on the network call before calling setState — leaving the screen mid-request throws the same class of crash.	`if (!mounted) return;` immediately after the awaited call.
3	P1	No try/catch around the network call — any failure left the submit button's spinner stuck forever with an uncaught exception.	Wrapped in try/catch; a visible, recoverable error state with a Retry action.
4	P2 · perf	A new repository (and its underlying HTTP client) was constructed on every submit instead of reused — a slow, steady resource leak invisible in a quick demo.	Repository injected once and reused for the widget's lifetime.

What a real engagement looks like

This is the shape of every fix delivered under the Bug-Fix Sprint or Audit-to-Fix Package: a patched branch/PR against the real repo, a written fix log mapped to each audit line item exactly like the tables above, and — wherever the existing codebase has a test setup, as most live Flutter/Node apps do — tests that prove the fix the way npm test proves it here.

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