Fix & Ship Mobile App Updates (ASP.NET Core, Flutter, PostgreSQL, Firebase)

@jastp

Greetings from Logictrix! My name is Jas, and I am looking forward to discuss about your app in details over the Chat or Call. We have enough app developers available in team so I can assure you to deliver this project at a fairly low cost with great quality and with a commitment for long term support. *** We have now earned 'Expertise' level in AI, ChatGpt and a couple of other AI platforms for App development and other Chatbot work! *** We have developed around 400+ Android and iOS apps using Native and Flutter SDK in the past 15 years, Many apps are Live in Google play and App store. We will share our detailed portfolio over the Chat once we connect. Looking forward to your reply... Thanks and Regards Jas

@AwaisChaudhry

With extensive knowledge and experience in both backend and frontend (specifically ASP.NET Core, PostgresSQL, Firebase, and Flutter), I bring a unique advantage to this project that few other developers possess. My history of handling production-related duties makes me confident in navigating the challenges you've described and enhancing your mobile-first app. Specific to your requirements, I can troubleshoot email deliverability issues, design optimal storage and delivery flows for file downloads, solve redirects/loops during the payment flow, and improve overall app performance through various techniques like pagination, query optimization, caching etc. Having successfully localized apps before, I assure you that I can not only fix the missing English-Czech translations but also skillfully integrate stable IDs for all reference data (countries, languages, zodiac etc) while providing proper formatting for dates and salary/currencies alongside the necessary notifications.

@irsolutions

I understand the urgency and importance of fixing critical issues and delivering production-ready updates for your mobile-first app. With my extensive experience in ASP.NET Core, Flutter, PostgreSQL, and Firebase, I am confident in addressing the key requirements outlined in your project description. In the realm of mobile app development, I have successfully worked on fintech projects, implementing payment flows, deep link handling, and file download optimizations. My proficiency in performance tuning with ASP.NET Core and PostgreSQL ensures efficient response times and enhanced user experiences. Additionally, my expertise in Flutter releases for both Google Play and Apple App Store submissions guarantees a smooth deployment process. I am a solo developer with a dedicated focus on both backend and Flutter, allowing for a streamlined and cohesive approach to your project needs. My availability aligns with your timeline, and I am ready to collaborate with you over the next 7-14 days to deliver impactful results. Let's get started on resolving your app issues and pushing out the necessary updates. Feel free to reach out to discuss further details and begin the audit process. I look forward to the opportunity to work together.

@Julian29

Hello, I read your requirements carefully and understood very well about the project scope and can start working in structured stages. I will address all priority issues in your ASP.NET Core + PostgreSQL + Flutter app, including: Reliable password reset emails (provider/config check, deliverability fixes) CV/PDF download flow (streaming, signed URLs, headers) Payment flow consistency with proper return URLs/deep links Performance optimizations (pagination, indexes, query tuning, caching) Full Czech + English localization (UI strings, notifications, formatting, reference IDs) I HAVE 10+ YEARS OF EXPERIENCE IN FULL-STACK DEVELOPMENT AND APP RELEASES, AND I WILL PROVIDE 2 YEAR FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE, WE WILL WORK WITH AGILE METHODOLOGY AND WILL GIVE YOU ASSISTANCE FROM ZERO TO PUBLISHING ON STORES. Deliverables: store-ready Flutter builds (iOS & Android), backend fixes, optimized DB queries, localization completion, and step-by-step submission guidance. I can start with the paid audit (2–4 hrs) to confirm access, reproduce issues, and create a fix plan with timelines. I eagerly await your positive response. Thanks.

@GintarasZelvys

Hi. As Flutter Expert, I am very interested in your project. I am very familiar with Flutter and ASP.NET Core. I have mobile and backend skills with 8+ years. I wish to work for you. Thanks for attention.

@kamran2012

Interesting project, I will start with the paid audit to confirm the backend and Flutter app run locally, document all missing access items, and deliver root cause findings with a fix plan for each priority issue. From there, I will work through the fixes: password reset email delivery, PDF download flow, payment return URL and deep link handling, performance optimization with pagination and indexing, and full Czech and English localization. Once stable, I will prepare submission-ready builds for both stores. For the payment return flow, I will implement universal links on iOS and app links on Android so the redirect lands back in the app reliably regardless of which browser or in-app webview the payment gateway opens. Questions: 1) Which email provider is currently configured for password reset (SendGrid, SES, SMTP relay)? 2) Which payment gateway is the app using, and is the redirect issue on one platform or both? Ready to start whenever you are. Kamran

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in Mobile App Development, C# Programming, PostgreSQL, ASP.NET, Flutter, Google Firebase, .NET Core, API Development, Performance Tuning, Payment Processing and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.   Best regards, Sales department Tangram Canada Inc.     

@sunainawbst

Hello I have read your project requriements, i can help you resolve even the most complex bugs in your mobile app. With a vast experience in API development and C# programming, I am skilled at investigating problems and providing timely solutions. I will fix the issues that causing your password reset emails not to deliver consistently. I’ve successfully launched multiple production apps across Google Play and App Store, delivering secure, optimized, and user-friendly solutions. ⭐Due to NDAs, links aren’t public—but once you open the chat, I’ll share live demos and walkthroughs. I’d be happy to discuss your requirements and execution plan. Bid amount is a placeholder and can be discussed over chat. Thanks & Regards Ranjana

@einnovention

With over a decade of experience in software development and a dedicated team of 25+ professionals, Einnovention is the methodical choice for your mobile app updates. Our core proficiency with ASP.NET, C#, and PostgreSQL has empowered our clients through fast response times, optimized queries, and efficient system performance – all skills pivotal to resolving the critical issues plaguing your app. On the mobile front, our enviable grasp of Flutter and Dart will set your project firmly on a path to success. My name is Asif and as head of Einnovention team, I want to assure you our end-to-end commitment to your project. Starting with the paid audit-first phase, we will thoroughly inspect to ensure backend functionality and proper running of the Flutter app locally. This will be followed by establishing a comprehensive guidelines list for any necessary access prerequisites like environment variables, databases, Firebase integration, email services configurations, payment flows set-up for both iOS & Android platforms.

@ixorawebmob

Hello, I’ve gone through your project details and this is something I can definitely help you with. I have 10+ years of experience in mobile and web app development, specialized in ASP.NET Core, PostgreSQL, and Flutter. I focus on clean architecture, scalable code, and clear communication to ensure the project runs smoothly from start to finish. Here's how I can assist: 1. Diagnose and make reliable the password reset email issue. 2. Fix the CV/PDF download flow to ensure files open correctly. 3. Resolve payment flow issues, ensuring seamless redirection. 4. Optimize performance through indexing and query optimization. 5. Address localization needs for Czech and English, ensuring proper formatting and stable IDs. I've successfully handled similar projects, including performance tuning for ASP.NET Core applications and Flutter app releases on both Google Play and the App Store. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob. Could you clarify your timeline for these updates and if there are any existing documentation or guides available for this project? Looking forward to discussing this further! Regards, Arpit Jaiswal

@rbtech1984

Hello There!!! ★★★★ (Fix & Ship Mobile App Updates – ASP.NET Core, Flutter, PostgreSQL, Firebase) ★★★★ I understand you need critical fixes and production-ready updates for your mobile-first app, covering backend, Flutter mobile, and localization issues. Key tasks include fixing password reset emails, CV/PDF download flow, payment deep links, performance optimization, and full Czech + English localization, followed by store-ready builds for both Google Play and Apple App Store. ⚜ Diagnose and fix password/email deliverability issues ⚜ Correct CV/PDF download flow with proper headers and streaming ⚜ Resolve payment redirects, callbacks, and deep link handling ⚜ Optimize backend performance with indexing, pagination, caching ⚜ Implement full localization and formatting (Czech + English) ⚜ Ship Play Store & App Store-ready Flutter builds with submission support ⚜ Provide paid audit, root cause analysis, and execution plan With 9+ years in full-stack development, I’ve handled ASP.NET Core + PostgreSQL performance tuning, Flutter releases, payment integration, and file delivery systems. I’ll start with a paid audit, confirm all access, fix the issues, and ensure smooth store deployment. Warm Regards, Farhin B.

@juanjosec63

Hello, I’m excited about the opportunity to contribute to your project. I have strong experience with ASP.NET Core, PostgreSQL performance tuning, and Flutter mobile apps, and I can diagnose and resolve the email delivery, file download, and payment redirect issues to make the platform production-ready. I’m comfortable starting with the paid audit to reproduce the problems locally, identify root causes, and deliver a clear fix plan with milestones. I have also handled payment return flows, PDF delivery fixes, and Play Store / App Store release preparation for Flutter apps. I’m available to work closely with your team over the next 7–14 days to stabilize the system and support the final store submissions. Best regards, Juan

@ParasTech7

I have 21 years of experince, Principal Software engineer, we have extensive experince with .NET and C# with MVC .NET , developed core apis , made scalable systems and developed with distributed architecutre. We also have extensive experince with Flutter and dart. I can improve performance, enhance scaliblity and deliver all the requirements upto your expectations.

@Feriver

Hello, I can fix and ship your mobile app updates across the full stack, covering ASP.NET Core backend, Flutter mobile, PostgreSQL database, and Firebase realtime/chat. I have experience diagnosing password/email delivery issues, correcting file download flows (PDF/CV), and ensuring payment flows handle deep links, callbacks, and return URLs reliably. I will perform a paid audit (2–4 hours) to confirm the app runs locally, identify missing environment variables or access credentials, and provide a fix plan with estimated timelines. Localization for Czech + English will be fixed, including strings, dropdowns, notifications, date/currency formatting, and reference IDs for stable data. Performance will be improved via query optimization, pagination, caching, and payload reduction where needed. After fixes, I will deliver production-ready builds for both Google Play and Apple App Store, including guidance for any account-owner actions. Full documentation and hand-off instructions will be provided for seamless submission. Thanks, Asif

@sabaehsan

Greetings, The issues you're facing with password reset emails and payment flow are critical to ensuring a smooth user experience. I can help by diagnosing the email deliverability problems and implementing a reliable solution. For the PDF download issue, I can fix the storage and delivery flow to ensure files are accessible as intended. With extensive experience in ASP.NET Core and PostgreSQL, I have successfully optimized performance through indexing and caching, which will help improve response times for your app. I also have a solid track record in releasing Flutter apps on both Google Play and the App Store, ensuring they meet all requirements for submission. As a solo developer, I handle both backend and Flutter tasks, allowing for seamless communication and execution. I’m available to start working with you in the next week. Best regards, Saba Ehsan

@VianRey1

It’s incredibly frustrating when core features like password resets, file downloads, and payment flows break the user journey, especially when every failed interaction costs user trust and retention. On top of this, inconsistent localization and slow performance can make your app feel unreliable to Czech and English speakers alike. You can expect a stable, production-ready release with reliable user flows, fast responses, and flawless localization across your entire stack. First, I’ll run a focused audit of your backend and Flutter app to pinpoint root causes for each issue. Then, I’ll map out exactly what’s needed for access and fixes. Finally, I’ll implement, test, and guide you through a smooth Play Store and App Store submission. Are there any specific error logs or user reports you’d like me to review first?

@hireageek

Hi there, I’m excited about the opportunity to work on your mobile-first app updates. As a top freelancer from California, I excel in optimizing applications built with ASP.NET Core and Flutter, consistently earning 5-star reviews for my work. I understand the critical needs of your project, such as fixing password reset emails and ensuring a seamless payment flow, and I’m confident that my experience aligns perfectly with your goals. I have successfully tackled issues similar to those you’ve described, including diagnosing email delivery problems and optimizing database performance with PostgreSQL. I also have a strong track record of delivering production-ready builds for both the Google Play and Apple App Store. I’m ready to dive in immediately, starting with the paid audit to confirm your current setup and outline a clear plan for execution. Let’s make your app the best it can be! What is the current status of the app in terms of user feedback and analytics, particularly regarding the issues you’ve outlined? Thanks,

@TechizeBuilder

Hi, I came across your project "Fix & Ship Mobile App Updates (ASP.NET Core, Flutter, PostgreSQL, Firebase)" and I'm confident I can help you with it. About Me: I'm a agency owner with over 8+ years of experience in Mobile App Development, Flutter, PostgreSQL, API Development, Google Firebase. , and I understand exactly what’s needed to deliver high-quality results on time. Why Choose Me? - ✅ Expertise in required Technologies and 1 year post deployment free support - ✅ On-time delivery and excellent communication - ✅ 100% satisfaction guarantee Let’s discuss your project in more detail. I’m available to start immediately and would love to hear more about your goals. Looking forward to working with you! Best regards, Deepak

@ChiragDeol

Hello, Your focus on delivering a truly production-ready, robust mobile-first app is excellent—addressing critical flows like password resets, file downloads, and payment handling will make a real difference for your users. To ensure reliable password reset emails, I recommend implementing transactional email providers with proper SPF/DKIM setup and monitoring bounce/reputation metrics. For the PDF download issue, reviewing the backend’s file streaming logic and using signed URLs (with accurate content-disposition headers) can resolve delivery gaps across platforms. Payment flow issues are often tied to deep link misconfigurations or missing callback handling—setting up consistent URL schemes and thorough testing across edge cases is key for a frictionless user experience. On performance, I'm experienced with ASP.NET Core and PostgreSQL optimization—I've implemented query indexing, pagination strategies, and response payload minimization in several apps with complex data flows. For localization, enforcing stable reference IDs (countries/languages/zodiac/roles), centralizing translation strings, and using locale-aware formatting for currency/dates are best practices I’ve applied to support dual-language deployments without cross-mode leakage. I’m comfortable owning both backend (C#, .NET Core API tuning) and Flutter app-side changes—including release management for Google Play and App Store. My approach includes hands-on debugging of deep link/payment returns (e.g., Stripe/Razorpay/PayU), fixing file download flows via backend API adjustments (streamed PDFs/signed S3 URLs), as well as guiding clients through store submissions with clear checklists. Recent work includes optimizing Tradebulls Touch 2.0’s backend for speed at scale (see links below), deploying production Flutter builds to both app stores, improving file download reliability in Moprep UPSC CMS, and resolving payment return logic in booking apps like Last Minute Hotel Reservation. For the audit: I’ll start by confirming local runs of your backend + Flutter app, listing any access gaps (env vars, DB creds, Firebase/email/payment/signing details), then mapping root causes for