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My Android app’s Google-based sign-in has stopped working. When a user chooses a Google account, the callback never supplies a valid token so they’re bounced back to the login screen. Traditional email/password flow remains fine; the fault is limited to the Google third-party authentication. The codebase is native Android (Kotlin and a small amount of Java) and currently uses the Google-Sign-In API bundled with Play Services. I suspect a recent API/SDK change, an SHA-1 mismatch, or a token parsing issue, but I need a fresh set of expert eyes to pinpoint and fix it. What I need from you • Review the existing authentication module, console configuration and SHA fingerprints • Update or refactor the Google Sign-In flow so it retrieves a valid ID token and user profile every time • Provide a clean pull request or zipped module with concise comments on the changes • Prove the fix with a short screen-capture or log demonstrating a successful login on a device running Android 13 (emulator or physical) Deliverable is the corrected source plus a brief summary of what was broken and how you resolved it. Once the updated build lets new and returning users authenticate via Google without errors, the job is done.
Project ID: 40734758
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51 freelancers are bidding on average ₹1,425 INR for this job

STOP scrolling. I’ll trace the Google login failure first, not rewrite it. Your working email/password login stays untouched while I isolate the fault. My mobile work includes HappyPics on Android/iOS and Quick Money in Flutter. I’ll check SHA-1 fingerprints, OAuth client IDs, package name and token flow. Then I’ll fix the callback or configuration issue and verify the ID token. I’ll return the corrected source, concise change notes and Android 13 proof. Send the repository and failing login logs; I’ll trace the exact break.
₹1,050 INR in 7 days
9.2
9.2

Having extensive experience of 6+ years in multiple areas, most notably Mobile App Development and Software Engineering, I can confidently say I'm the best fit for your project, "Fix Android Google Login Failure". Recently, I've been working on similar projects and providing effective solutions to debugging issues within the codebase. Talking specifically about Android and your requirement to assess the existing authentication module, console configuration, and SHA fingerprints, I have deep knowledge and extensive hands-on experience with Kotlin and Java – which are the exact languages utilized in your app's codebase. Moreover, I've a proven track record to adapt seamlessly with new technologies or SDKs so you can rely on me for pinpointing the recent API/SDK change causing the login failure. In addition to finding out the root cause of the problem, I'll leverage my skills to update or refactor the Google Sign-In flow using concise comments as you require. The deliverable will include a clean pull request or zipped module with clear summary on what was fixed and how it got resolved. Lastly, I'll demonstrate my solution via commendable screen-capture or log illuminating a successful login on an Android 13 device (either emulator or physical device). So let's make a strong choice for resolving your Google-based sign-in issue together!
₹1,500 INR in 1 day
6.3
6.3

Hello sir, I'm an android developer for 6+ years. I can fix this issue instantly Send a message Thank you.
₹1,000 INR in 1 day
6.0
6.0

Hello Sir, I have already worked on similar types of website and software development projects and I am confident that I can successfully handle your project. I am a full-time freelancer with **17+ years of experience** in web development, software development, automation, and API integrations. My expertise includes: * Android app development * ASP.NET C# web and software development * Python automation and web scraping (Amazon, Instagram, Facebook, Google Maps, LinkedIn, Telegram, and other custom scraping solutions) * JavaScript, jQuery, AJAX, Bootstrap, HTML5 * Microsoft SQL Server database development * Payment gateway integration * SMS, Email, Banking, Financial, and Insurance API integration * Custom automation bots and workflow automation software I focus on delivering **high-quality, scalable, and reliable solutions** with clean code and long-term support. Please contact me in private chat so we can discuss your requirements in detail. I can also show you a **demo of similar projects** I have completed. Looking forward to working with you. Thanks & Regards
₹1,500 INR in 5 days
5.7
5.7

I can diagnose and fix this Google Sign-In issue directly in your existing native Android codebase. I have 9+ years of Android/software engineering experience with Kotlin, Java, Google authentication, Firebase/Google APIs, Gradle, signing, SHA fingerprints, and Play Store release configuration. I’ll check the complete auth path: - SHA-1/SHA-256 and OAuth client configuration - package name / signing certificate mismatch - ID token request and server client ID - callback/result handling - token parsing and backend validation - Play Services/API compatibility If the current Google Sign-In implementation is the problem, I can refactor it to the current recommended authentication flow without affecting your existing email/password login. I’ll provide clean source changes, a concise summary of the root cause, and proof of successful Google login on Android 13 through logs or screen recording. You can also check my client reviews. I can start immediately.
₹1,500 INR in 1 day
5.7
5.7

Hello I have just recently added the Google sign in in one of my game. I understand that your users are experiencing difficulties logging in using Google accounts and my goal is to get them back to enjoying a smooth authentication process as quickly as possible. In order to do this, I'll meticulously review your existing codebase, console configurations, and SHA fingerprints to identify the root cause of the failure. Whether it's an API/SDK change issue or token parsing problem, I'll handle it. I am fully confident that I will be able to update or refactor your current Google Sign-In flow so that it retrieves a valid ID token and user profile consistently.
₹1,500 INR in 1 day
4.9
4.9

The failure is isolated to the Google authentication callback, so I’d trace the sign-in flow end-to-end rather than changing the working email/password authentication. I can review the Kotlin/Java authentication module, Google/Play Services configuration, OAuth client setup and SHA fingerprints to identify whether the issue is coming from configuration, the SDK/API flow, or ID-token handling. I’ll then correct the implementation so the Google account returns the expected ID token and profile data without affecting the existing login flow. I’ll also verify the fix on Android 13, including both a fresh Google login and a returning-user login, and provide the corrected source/module with concise change notes plus a short verification recording or log. Send over the Android project and the current Google/Firebase authentication configuration, and I can trace the failing callback directly.
₹1,050 INR in 5 days
4.5
4.5

Hi, I’m an Android developer with 5 years of experience in Kotlin and Java, and I can troubleshoot your Google Sign-In flow by reviewing the authentication code, OAuth configuration, SHA fingerprints, Play Services setup, and ID token handling. I’ll identify the root cause, implement a clean fix, test successful authentication on Android 13, and provide the corrected source with a concise summary and validation evidence.
₹1,150 INR in 1 day
4.5
4.5

As a seasoned tech professional with a deep understanding of both software engineering and AI, I have the perfect combination of expertise to tackle your issue effectively. My extensive experience in building full-stack web and mobile applications and conducting API integrations matches perfectly with your project requirements. With my background in Android, API development, Java, and Mobile App Development, I can confidently review the existing authentication module and rectify any vulnerabilities that might be causing the Google login failure. Over the years, I've successfully built AI-driven digital products including chatbots and voice agents for tasks such as customer support, analytics platforms for business automation, recommended systems and many more which have garnered me an impressive track record regarding problem-solving. I understand how vital this Google Sign-in issue is for your app's functionality, and rest assured, I will leave no stone unturned to fix it swiftly. Not only will I update or refactor the code as required but also provide you with a concise comment regarding each change made while providing a clean pull request or zipped module.
₹600 INR in 7 days
4.6
4.6

Hi, I can trace the Google sign-in callback and compare package name, signing fingerprints, OAuth client IDs and token audience/configuration to identify why the ID token is missing. I will keep the working email/password flow intact and avoid weakening token validation to hide the error. The fix will be delivered as a focused source patch with a cause/fix note and a successful Android 13 login recording or redacted log. INR 1,500 covers one isolated sign-in fault; a larger auth migration would be discussed separately. Does the failure affect debug, release or Play-distributed builds, and what exception/status code is currently logged?
₹1,500 INR in 1 day
4.3
4.3

Hi, I can diagnose and fix the Google Sign-In issue in your native Kotlin/Java Android application. I’ll review the authentication flow, Firebase/Google configuration, OAuth client, SHA fingerprints, and ID-token handling. I’ll identify whether the issue is caused by SDK changes, configuration mismatch, callback handling, or token parsing. I’ll implement a clean fix and provide the updated source/module with concise comments explaining the changes. I’ll verify successful Google authentication on Android 13 and provide a short screen recording/log as proof. I can start immediately and deliver a clear summary of the root cause, fix, and verification results.
₹1,250 INR in 1 day
4.1
4.1

Hello, I understand you need to fix Google Sign-In in your native Android app, where the Google account callback is failing to provide a valid token while email/password authentication works normally. The goal is to restore reliable Google authentication and provide a verified fix. Here’s what I can provide: Review the Kotlin/Java authentication flow, Google Sign-In configuration, OAuth client settings, SHA fingerprints, and Play Services integration. Debug and refactor the sign-in flow to correctly retrieve the ID token and user profile while handling authentication errors safely. Provide the corrected source/module with concise comments, a clear explanation of the root cause, and proof of successful login on Android 13. I bring 4+ years of software development experience with JavaScript, Python, APIs, authentication, and full-stack development, with a strong focus on debugging and reliable application flows. Just to clarify a few things: Are the Firebase/Google Cloud project and OAuth credentials currently accessible for configuration checks? Does the app use Firebase Authentication after receiving the Google ID token? Please come to the chat box to discuss more about your project. Best regards Indresh Kushwaha
₹3,050 INR in 7 days
2.3
2.3

As an experienced Android developer, I have extensive knowledge of API Development, Mobile App Development and more importantly, fixing login issues, such as the one you're experiencing. My expertise in Java, Kotlin and developing native Android apps with Google Sign-In will prove to be invaluable in resolving your problems. So far in my career, I've successfully had to address similar problems that arise from recent API/SDK changes, fingerprint mismatches, and token parsing issues and in each case I've managed to debug and rid them. By reviewing the existing authentication module and console configuration, I'll be able to pinpoint the problem easily and provide streamlined code solutions that not only provide a fix but guarantee a stable path for future credential updates. By entrusting the project me, you can rest assured knowing that you are hiring a dedicated team player who prioritizes high performance and clear communication. Highly focused on efficient delivery of clean code, I'll ensure all changes made are comprehensively documented with concise comments so future troubleshooting becomes easier if need be. Let's bring your app back on track.
₹600 INR in 7 days
2.5
2.5

Hi, the Google Sign-In API issue in your Android app is likely due to an SHA-1 mismatch or a token parsing problem. I'd approach this by reviewing the existing authentication module and console configuration. I'll set up a test environment to replicate the issue and identify the root cause. In my experience, a common mistake is not handling token refresh correctly, which can lead to authentication failures. I'll update the Google Sign-In flow to retrieve a valid ID token and user profile every time, and provide a clean pull request with concise comments on the changes. The client can expect a successful login on a device running Android 13, with a brief summary of what was broken and how it was resolved.
₹1,050 INR in 7 days
2.2
2.2

Fixing bugs and debugging is a core aspect of mobile app development, something I specialize in. With Kotlin and Java expertise, I'm comfortable wading through the codebase to identify the root cause of the issue that is plaguing your Android app's Google-based login. I have immense experience working with API integration, particularly the ones bundled with Play Services, which makes me familiar with common error sources and how to fix them swiftly. In terms of problem-solving approach, I like to be thorough in my investigations. Apart from reviewing the existing authentication module and console configurations, I'll examine the SHA fingerprints and token parsing as well as investigate possible recent changes in Google's API/SDK that may be disrupting the functionality. A detailed zipped module with concise comments on the changes made will accompany a successful fix by me. I always believe that explaining the solution aids not just in the present but also for future maintenance. Lastly, my mobile app development proficiency extends to Android 13 – whether it's working on an emulator or physical device. So, once my work on this project lets both new and returning users enjoy smooth Google authentication without any errors, you can breathe easy. Don't hesitate to shoot any further clarifications my way. Let's get your app back on track!
₹1,500 INR in 2 days
2.0
2.0

Hi there, A silent token failure after account selection usually traces to one of three culprits: a SHA-1/SHA-256 fingerprint mismatch in the Google Cloud console, a deprecated GoogleSignInClient configuration under recent Play Services updates, or the ID token being read from the wrong result path (a frequent mistake is passing the Android client ID where requestIdToken requires the Web client ID). My approach: 1. Audit — verify debug/release SHA fingerprints against the console's OAuth client, confirm the correct client ID is used for requestIdToken, and trace the onActivityResult callback to see exactly where the token is dropped. 2. Fix — update to the current Credential Manager / Google Identity Services API if the legacy flow is deprecated, or correct the existing implementation with proper token retrieval and null-safety. 3. Prove — deliver a clean PR (or zipped module) with concise comments, plus a screen recording or logcat capture showing successful Google login on Android 13, tested with both new and returning accounts. Timeline: 1–2 days diagnosis + fix; same-day verification once the root cause is confirmed. I work Kotlin-first (Jetpack Compose, MVVM, Room) and handle mixed Kotlin/Java codebases comfortably, including Firebase Auth handoffs. Happy to start with a quick diagnostic pass on your auth module and console setup before you commit to the full fix. Send repo access or the relevant files and I'll pinpoint it fast. Ready when you are.
₹1,050 INR in 2 days
1.8
1.8

Hello, We can help you resolve the Google Login failure in your Android application. Our team has experience with Android authentication, Google Sign-In integration, Firebase Authentication, OAuth 2.0 configuration, SHA certificate fingerprints, and debugging login-related issues. We'll investigate the root cause, fix the authentication flow, and ensure Google Login works reliably across supported Android devices. We can also review the existing implementation and provide a stable, well-tested solution. We're available to start immediately and would be happy to review your current code and error logs. Regards, Acute Tech Solutions
₹1,050 INR in 7 days
1.9
1.9

Hi, I can diagnose and fix the Google Sign-In issue in your Android app. I’ll check the Google authentication configuration, SHA fingerprints, Play Services setup and ID-token flow, then test the fix on Android 13. I have experience with Android Java/Kotlin and Firebase authentication. I can start immediately and provide the corrected source with a clear summary of the fix.
₹1,050 INR in 7 days
1.9
1.9

If the ID token isn't coming through after account selection, the most common causes are that the console is missing the SHA-1 for the exact keystore the build is signed with, or the code is using the Android client ID instead of the Web client ID. Also, the old GoogleSignIn API is already being phased out by Google in favor of Credential Manager. I've built backend authorization services for SMS-code login in TypeScript and Supabase, but the Android side is an adjacent area for me. Did both debug and release break the same way, or only the release build from Play?
₹958 INR in 2 days
0.3
0.3

Hi, I can help diagnose and fix the Google Sign-In failure in your native Android Kotlin/Java application. From your description, I would first trace the complete authentication flow and verify the Android package name, SHA-1/SHA-256 fingerprints, OAuth client configuration, Google Sign-In/Play Services setup, ID-token request (`serverClientId`), and token parsing/callback handling. I’ll also check for any SDK/API changes that may have affected the existing implementation. My approach: • Reproduce the Google login failure and inspect the callback/logcat output • Verify Firebase/Google Cloud OAuth configuration and SHA fingerprints • Correct or refactor the Google Sign-In implementation as required • Ensure a valid ID token and user profile are returned consistently • Test the corrected flow on Android 13 emulator/physical device • Provide the updated source/module with concise comments and a short summary of the root cause and fix • Provide a short screen recording or logs demonstrating successful Google authentication I have Android development experience with Kotlin/Java, Firebase authentication and mobile application debugging, so I can work directly with the existing code rather than rebuilding the authentication system unnecessarily. I can start immediately and aim to deliver the fix within 1–2 days. Best regards, Nabil
₹1,200 INR in 7 days
0.0
0.0

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