Crashes and runtime errors
Startup failures, null and type errors, async exceptions, platform-channel failures, lifecycle issues, and crash-log investigation.
FLUTTER • DIAGNOSIS • BUG FIXING
Your Flutter App Is Broken. Let’s Diagnose It and Fix the Right Thing.
I troubleshoot existing Flutter applications across Dart code, UI and state, APIs, Firebase, dependencies, Gradle, CocoaPods, Android, iOS, and release builds—then make a focused, testable correction.
Flutter • Android • iOS • Firebase • App Publishing
THE RIGHT STARTING POINT
A visible bug may be several layers away from its cause
When API data does not appear, the server may have returned a different shape, authentication may have expired, parsing may have failed, state may not notify the screen, or the widget may be reading the wrong branch. When Android works and iOS does not, the shared Flutter flow can still depend on a missing entitlement, pod, permission description, URL scheme, or platform SDK. A crash after an upgrade may be a package conflict, a changed API, native build tooling, or code that relied on old behavior.
I do not begin by promising a rewrite. I reproduce the failure, capture the useful logs, trace the data and state around the symptom, and identify the smallest maintainable change that addresses the root cause. If investigation reveals a broader architectural problem, you receive that explanation before the scope expands.
RECOGNIZE THE SYMPTOM
Is this the problem you are dealing with?
Send the closest symptom even if you do not know the technical name for it.
The app crashes after an update
A Flutter, Dart, plugin, Android SDK, Xcode, or dependency change introduced a runtime or startup failure.
Android works but iOS does not
A native configuration, permission, entitlement, pod, service file, or platform-specific code path is inconsistent.
API data is wrong or missing
Requests, authentication, JSON parsing, models, caching, state updates, pagination, or error handling breaks the user flow.
The UI or state becomes inconsistent
A screen does not update, navigation loses data, loading never ends, forms reset, or an async race produces intermittent behavior.
Gradle, CocoaPods, or builds fail
Toolchain versions, native dependencies, SDK targets, scripts, flavors, signing, or package requirements no longer agree.
The bug appears only in release
Production environment values, minification, signing, permissions, service configuration, or optimized timing changes the behavior.
Performance has become noticeably worse
Excess rebuilds, expensive work on the UI thread, oversized data, image handling, memory pressure, or repeated network work needs investigation.
FOCUSED FLUTTER SUPPORT
Flutter bugs I can help diagnose
The categories below overlap. That is normal—the diagnosis establishes which layer actually owns the failure.
UI and state bugs
Incorrect rebuilds, stale or lost state, navigation problems, forms, layout overflow, race conditions, and inconsistent loading/error states.
API and data problems
Requests, tokens, interceptors, JSON parsing, models, pagination, caching, timeouts, retries, and error presentation.
Firebase issues
Authentication, Firestore, FCM, initialization, rules-related errors, and Android/iOS configuration differences.
Dependencies and upgrades
Package conflicts, breaking API changes, Flutter/Dart upgrades, native SDK requirements, discontinued plugins, and migration work.
Android and iOS builds
Gradle, Android SDK, manifest, CocoaPods, Xcode, signing, entitlements, flavors, environments, and release-only failures.
Performance symptoms
Slow screens, jank, repeated rebuilds, heavy parsing, unnecessary requests, image pressure, and obvious resource bottlenecks.
Release and store blockers
Problems that appear during AAB, archive, upload, TestFlight, Google Play, or App Store review preparation.
A PRACTICAL PROCESS
How I approach the problem
The first milestone is a reproducible failure and a defensible root-cause hypothesis. That keeps the fix measurable and reduces regression risk.
- 01
Diagnose
I review the error, reproduction steps, relevant logs, current Flutter and dependency versions, and the platform configuration around the failing flow.
- 02
Identify the root cause
I separate symptoms from the underlying problem and determine whether it comes from Dart code, native configuration, Firebase, an API, dependencies, signing, or store setup.
- 03
Fix and test
I implement the smallest maintainable fix, then test the affected flow and the nearby paths most likely to regress on Android, iOS, or both.
- 04
Deliver clearly
I explain what changed, call out any remaining product or store decisions, and prepare the code, build, or submission for its next step.
RELEVANT TECHNOLOGIES
Tools around the Flutter application
The exact stack depends on the codebase and the problem. These are the technologies most relevant to this service.
- Flutter
- Dart
- Firebase
- REST APIs
- Android
- iOS
- Gradle
- CocoaPods
- Xcode
- Google Play
- App Store Connect
- Git
- Supabase
WORKING TOGETHER
Why work with me?
Credibility should come from how the work is handled—not inflated promises.
Diagnosis before changes
A precise diagnosis prevents unrelated rewrites and keeps the scope focused on the actual blocker.
Existing-app experience
I am comfortable entering an established codebase, tracing unfamiliar flows, and improving it without treating every issue as a rebuild.
Android and iOS awareness
Flutter shares application code, but release builds, permissions, signing, entitlements, and store requirements still need platform-specific attention.
Clear communication
You receive a practical explanation of the cause, the work completed, what was tested, and what you should do next.
App and backend context
I can trace problems across Flutter UI, state, Firebase, REST APIs, authentication, push notifications, and native configuration.
Testing before delivery
The affected path is checked after the fix, with attention to release-mode and cross-platform differences when they are relevant.
REAL WORK FROM THIS PORTFOLIO
Selected mobile application work
These are existing projects already published on this website. Each card focuses on the problem and the application solution without inventing client metrics.
FilmFone Chat
- Problem
- Filmmakers needed a practical way to create and play realistic on-screen chat conversations for scenes.
- What I implemented
- Character creation, scene-based conversations, message timing, playback, appearance controls, and multi-participant chats.
- Technology
- Cross-platform mobile application for iOS and Android
- Solution
- A focused production tool available through both Google Play and the App Store.
Lockbox Private Communication
- Problem
- The product needed a privacy-first messaging approach beyond the protections offered by general communication apps.
- What I implemented
- A secure messaging design covering encrypted communication, spam-link detection, file sharing, group chats, and privacy controls.
- Technology
- Cross-platform mobile architecture and secure communication features
- Solution
- A defined and implemented foundation for a private, feature-rich messaging experience.
Isotop Forms
- Problem
- Internal auditors and sales teams needed a guided way to collect customer information during on-site quotation visits.
- What I implemented
- A step-by-step mobile workflow, document handling, recent-case views, and a clear interface for field use.
- Technology
- High-performance iOS and Android business application
- Solution
- A streamlined field-data workflow designed around speed, clarity, and reliable day-to-day use.
Dr. Lawyer
- Problem
- Clients needed an easier way to find relevant legal help while lawyers needed a structured channel for qualified opportunities.
- What I implemented
- Role-based experiences, lawyer discovery, matching, professional profiles, secure chat, document sharing, and subscription flows.
- Technology
- SaaS mobile application with messaging and role-based workflows
- Solution
- A two-sided mobile product connecting clients and legal professionals through a focused experience.
A CLEAR WAY TO START
Prefer working through Upwork?
Hire me securely through my Upwork profile or start with my fixed-price Flutter development service. The links open the official Upwork destinations in a new tab.
Fixed-price service on Upwork
FLUTTER DEVELOPMENT SERVICE
Flutter App Development | Android & iOS | Firebase & AI Integration
Development, bug fixing, Firebase and API integrations, publishing, and focused improvements for existing applications.
REDUCE THE BACK-AND-FORTH
Send me these 3 things
You do not need to diagnose the code yourself. A precise symptom and context are enough to begin.
Send the Issue on Upwork- 1
What you expected to happen
- 2
What currently happens, including the complete error or a short recording
- 3
Flutter version, affected platform, build mode, and the last known change
COMMON QUESTIONS
Flutter Bug Fixing FAQ
Practical answers before you share access or start a contract.
See what to send firstCan you fix a Flutter app you did not originally build?
Yes. I begin by locating the relevant flow, reproducing the issue, and understanding the project structure and dependency state. Existing code quality affects the investigation time, but it does not automatically require a rebuild.
What information helps you diagnose a Flutter bug?
The expected behavior, actual behavior, complete error or log, reproduction steps, affected platform and build mode, Flutter version, and the last change before the issue appeared are the most useful starting points.
Can you fix both Android and iOS build errors?
Yes. I can investigate Flutter build issues and the surrounding Gradle, Android SDK, manifest, CocoaPods, Xcode, signing, entitlement, and native dependency configuration.
Can you fix release-only bugs?
Yes. Release-only failures often involve environment configuration, service credentials, app identity, signing, optimization, permissions, native setup, or timing. A release log and reproducible build are important.
Will you rewrite the app to fix one bug?
Not by default. I aim for the smallest maintainable correction that addresses the root cause. If the issue exposes a wider architectural risk, I explain the evidence and tradeoff before recommending broader work.
Can you provide ongoing Flutter app maintenance?
Yes, after the immediate issue and codebase are understood. Maintenance can include dependency updates, platform requirement changes, regression fixes, release preparation, and incremental improvements.
NEXT STEP
Still stuck with your Flutter app?
Send the symptom, error, and affected platform through Upwork. I will review what needs to be diagnosed and fixed.