Payment stopped working for 15% of users after an iOS update. Or the Android app crashes when opening a notification. Critical bugs demand an urgent hotfix, and we solve this in 2–8 hours. Our team has been handling emergency bug fixes for mobile apps for over 5 years, completing 80+ successful hotfix campaigns. Contact us — we assess the situation within an hour and start working. We know how to quickly localize the crash cause, ship a minimal fix, and pass app store moderation on expedited track. Guarantee: if the bug recurs within a month, we fix it for free.
We encounter such situations daily. Our proven protocol: within 30 minutes we identify the root cause, within 2–8 hours we release a hotfix. Our goal is minimum downtime and complete relapse prevention.
Critical Bug Criteria
Critical bugs block core functionality: payments, authentication, primary user scenario. Metrics: crash rate >1% of sessions in the last 6 hours or ANR rate >1% on Android (risk of Google warning). Also, vulnerabilities with data leak risk require immediate fix. A bug with incorrect date display in profile is not critical. A crash when attempting to place an order is critical.
How We Diagnose and Release a Hotfix
Diagnostics (first 30–60 minutes)
We look at Crashlytics: device version, OS version, precise stack trace. If the crash started after a specific release — git diff between versions. If started outside a release — we check backend changes: API response, data format, new endpoint.
Typical scenario: the backend returned null in a field that the client doesn't handle — NullPointerException or force-unwrap. Fix: defensive parsing.
// Before — crashes on null val price = response.price.toDouble() // After — graceful handling val price = response.price?.toDoubleOrNull() ?: 0.0 Development and Testing
Hotfix branch from current production tag. Minimal change — no "while we're at it" refactoring. Test on a real device with the OS version where the crash reproduces. For Android — staged rollout (10% → 50% → 100% with 1–2 hour steps).
Publication
App Store: use Resolution Center to request Expedited Review (Expedited Review Guidelines). Provide specific justification: "crashes for 100% of users on iOS 17.4 during payment". Time: a few hours. Google Play: staged rollout, full rollout in one day. If remote kill switch is implemented — disable the problematic feature without a release.
Why Trust Our Hotfix?
Our experience: 5+ years, 80+ hotfix campaigns, certified iOS and Android engineers. We find the cause 2x faster than an in-house team — thanks to ready-made checklists and tool access (Crashlytics, Sentry, Datadog). In a recent case, we saved a client $15,000 by fixing a bug in 3 hours instead of two days of downtime. Guarantee: if the bug recurs within a month — we fix it for free.
What's Included in the Hotfix Service
| Stage | What We Do | Result |
|---|---|---|
| Diagnostics | Analyze crash reports, git log, backend logs | Root cause localized |
| Development | Minimal fix, code review | Ready hotfix commit |
| Testing | On real devices + unit tests, regression pass | Stability confirmed |
| Publication | Expedited review / staged rollout, monitoring | Store update + stable metrics |
| Post-mortem | Root cause report, prevention plan | Regression tests, monitoring improvements |
Typical Crashes and Solutions
| Crash Type | Typical Cause | Quick Fix |
|---|---|---|
| NullPointerException | Unhandled null from API | Defensive parsing |
| Force-unwrap in Swift | Optional value without handling | Use guard or if-let |
| Memory leak | Leak in closures | Weak references |
| Unsupported API | Deprecation in new OS | Conditional compilation |
How to Order a Hotfix
- Contact us via Telegram or email. Describe the problem: OS version, devices, crash metrics.
- We run remote diagnostics within 30–60 minutes, determine the cause.
- You approve the work plan — minimal fix or workaround.
- We develop the hotfix, test on real devices.
- We publish via Expedited Review or staged rollout, monitor metrics.
- We conduct a post-mortem and prepare a prevention plan.
Get a consultation or order a fix — we assess the situation within an hour. Contact us — we start work within 30 minutes of your request.
Estimated Timelines and Pricing
Diagnostics and minimal fix for a standard crash: 2–8 hours. Pricing starts at $500 for standard hotfix. Issue involving OS or SDK behavior changes: up to 2 business days. Pricing is determined individually after analyzing the situation.