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I already have a working Android project ZIP for my railway information app "ChaloTrain". The major UI and app structure are already developed. I need an experienced Android + Backend developer to complete the remaining work and take the existing project to Google Play Store publication. IMPORTANT: Do NOT build the app from scratch. Use my existing project ZIP as the base project. CURRENTLY COMPLETED: - Premium Android UI - Home screen - Splash screen - Search Train - Search Train autocomplete - Recent Searches - Live Train Status UI/navigation - PNR UI - Bottom navigation - Settings - Language support - Dark mode - About / Privacy / Terms REMAINING WORK: - Complete railway API integration - Backend/API proxy - PNR API - Live Train Status API - Train Schedule API - Trains Between Stations API - Seat Availability API - Fare Enquiry API - Live Station API - Train Classes API - API caching/rate-limit handling where required - Secure API keys - Loading/error/empty states - Small UI/UX fixes - Remove remaining mock/demo data - Complete testing - Production release build - Google Play Console submission - Play Store publishing assistance QUALITY REQUIREMENTS: - No fake railway data in production - No hardcoded API keys in Android client - Preserve existing working UI and navigation - Do not unnecessarily redesign existing screens - Fix compilation errors and release-blocking bugs - Test real API responses - Test API errors, timeout, no internet and rate limits - Test the app on a real Android device - Provide a working demo APK before final release DELIVERABLES: 1. Updated Android source code 2. Backend/source code 3. Working demo APK 4. Production signed AAB 5. API/backend configuration documentation 6. Play Store submission assistance 7. Final published app on Google Play Store, subject to Google's review process BUDGET: ₹10,000 FIXED TOTAL. MILESTONES: ₹2,000 — Existing project setup + working demo ₹3,000 — API/backend integration ₹2,000 — Testing + bug fixing ₹3,000 — Production AAB + Play Store submission/publishing IMPORTANT: Before accepting the project, download/review the existing ZIP and confirm that you can complete the agreed scope within ₹10,000. Do not ask for additional payment for the agreed scope after starting the project. If any task is outside the agreed scope, discuss it with me and get approval before doing it. Please mention in your proposal: - Android/Kotlin experience - Jetpack Compose experience - Backend/API experience - RapidAPI experience - Google Play Console experience - Estimated completion time - Confirmation that ₹10,000 fixed budget is acceptable
Project ID: 40731502
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58 freelancers are bidding on average ₹9,198 INR for this job

I see you need to finalize your ChaloTrain app using the existing project ZIP, focusing on API integration and making sure no fake data or hardcoded keys make it to production. I understand the importance of preserving those UI elements and navigation while tackling the remaining API integrations, especially with multiple endpoints like PNR and Live Train Status. And I’ll start by setting up the existing project and making sure it compiles without errors, I’ll integrate the necessary APIs securely, handle caching and rate limits, and test thoroughly on real devices. I’m comfortable with the budget of ₹10,000 and can go ahead and deliver everything you need, including the signed AAB and Play Store submission assistance. I'm ready to get started on this right away, so just let me know when you want to kick things off. Rajavel | Android Developer | Kotlin | Jetpack Compose
₹10,000 INR in 7 days
7.0
7.0

As a seasoned Senior Software Engineer who has been active in the field since 2015, I believe I possess the precise set of skills that your Finalization of 'ChaloTrain' Android Railway App requires. My proficiency extends to Android/Kotlin, Jetpack Compose, Backend/API, RapidAPI as well as working on Google Play Console. I fully comprehend your project requirements and its budget, and I'm confident in my capacity to not only complete but elevate your app to meet Google Play Store standards. One of my greatest strenghts is my ability to understand existing structures and work with them effectively and efficiently which aligns perfectly with your objective of building upon the already developed structure without redesigning unneccessarily. Over the years I've learned how important it is to maintain code quality in current application while making updates or improvements. As you detailed, preserving the working UI, bug fixing and API/backend integration are all tasks I have a great command over. Your project requirements also touches upon my expertise in backend development using technologies such as NestJS, NextJs, ReactJs etc. Combining this knowledge with my AWS and Digital Ocean hosting experience will secure efficient API key storage keeping your security paramount. Throughout my career-developing custom software à la carte has become something of a norm for me and your requirements rest close to home. Believe me when I say: Jaynat's got this!
₹11,500 INR in 5 days
6.3
6.3

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
₹12,500 INR in 8 days
5.7
5.7

Hello Client, Greeting of the day!!!! I read your job description. I can do this job with quality product. I am always available for your support. Thanks
₹10,000 INR in 50 days
6.7
6.7

Hello, I am Karthik, an Android developer with over 10 years of experience in mobile app development, backend integration, and Google Play Store publishing. I have thoroughly reviewed your requirements for the "ChaloTrain" app and am confident in my ability to complete the remaining work using your existing project ZIP as the foundation. I have extensive experience with Android/Kotlin, Jetpack Compose, and backend/API integration. My background includes working with various APIs, including RapidAPI, and I am well-versed in handling API caching, rate-limiting, and secure key management. I understand the importance of maintaining the existing UI and ensuring a seamless user experience while integrating the required APIs, testing, and preparing for publication on the Google Play Store. I will also ensure that the app adheres to your quality requirements, including the testing of real API responses and handling various edge cases. I confirm that the fixed budget of ₹10,000 is acceptable, and I am ready to commence immediately. Based on the scope, I estimate the project will take approximately 4 weeks to complete. Looking forward to your positive response. Best regards, Karthik
₹27,000 INR in 7 days
5.1
5.1

Since ChaloTrain already has the UI, navigation, language support, dark mode, and railway screens in place, I’d work from your existing project ZIP and focus only on the API/backend layer, production hardening, and Play Store release. I work with Android/Kotlin, Jetpack Compose, REST APIs, backend proxies, caching, secure key handling, and Play Console releases. The two priorities would be integrations and clean implementation: railway APIs would sit behind a backend so keys stay out of the app, with caching, timeout handling, rate-limit protection, and proper loading/error/empty states while preserving your current UI. I’m comfortable with RapidAPI-style auth, quotas, retries, and backend proxying. I can test real responses, remove mock data, fix release issues, produce APK/AAB builds, and assist through Play Store submission. A relevant project is Moholla, where I worked on mobile apps with customer/driver/shop-owner flows, backend integrations, live operational data, and app-store deployment. Estimated completion: 7–10 days after ZIP/API review. ₹10,000 fixed is acceptable for the described scope, provided the existing project is structurally sound and the required APIs are available as expected. I would review the ZIP first and confirm before starting.
₹50,000 INR in 7 days
5.0
5.0

As an accomplished software engineer with a diverse professional background, I have the technological prowess and strategic mindset to fuel your "ChaloTrain" app to success. My 20+ years of experience includes multiple roles where I've demonstrated my knack for developing and integrating robust technological solutions. My resume boasts of AI-driven voice and chat agents, machine learning platforms, full-stack SaaS applications, custom AI tools, responsive web and mobile applications with scalable architecture, not to mention my proficiency in API integrations. I've worked on projects extensively similar to ChaloTrain that required Android development, backend engineering, and API integration -- essentially the very skills you are looking for. Having previously served as a Chief Technology Officer of an AI startup, I know how to deliver under budget constraints without compromising on quality. Your project not only aligns perfectly with my skillset but also gives me an opportunity to leverage my Java and Android expertise for rapid API integrations and secure key handling. I am fully committed to delivering exceptional value within your budget parameters as outlined in your project description. My estimate completion time is X days or less, during which I will meticulously ensure all remaining tasks are completed up to your satisfaction.
₹1,500 INR in 7 days
4.7
4.7

Since ChaloTrain is already developed, I’ll work from your existing ZIP rather than rebuild the app. My focus will be completing the railway APIs, backend and production release while preserving your current UI/navigation. I can handle: ✅ Kotlin/Android + Jetpack Compose project review ✅ Railway API/backend proxy integration ✅ PNR, Live Status, Schedule, Trains Between Stations, Seat Availability, Fare, Station & Classes APIs ✅ Secure API-key handling, caching/rate limits ✅ Real API responses + loading/error/empty/offline states ✅ Remove mock/demo data and fix release bugs ✅ Real-device testing + working demo APK ✅ Signed AAB + Google Play Console submission assistance I’ll first review the ZIP and existing architecture, then confirm the remaining scope before development. I won’t unnecessarily redesign completed screens. Ashish Malik | Full Stack Developer & Digital Marketing Expert 9+ years | 500+ projects delivered ₹10,000 fixed budget is acceptable for the agreed scope, subject to ZIP review. I’ll confirm the completion timeline after reviewing the project and API requirements. I can share relevant verified Android/API examples where available. Let’s start a chat and I’ll map the remaining work against your milestones.
₹35,000 INR in 7 days
4.6
4.6

Hi Mate , Good evening! I am an expert mobile coder with skills including PHP, API Integration, Java, Android App Development, Android, Backend Development, Kotlin and Mobile App Development. "ChaloTrain" Please contact me to discuss more regarding this project. Thanks for giving opportunity
₹7,770 INR in 4 days
4.3
4.3

Hi, I see the ChaloTrain app has a solid UI foundation, but the railway API integration is incomplete, which is where I'd focus my efforts, starting with the PNR API and Live Train Status API. I'd approach this by setting up a backend proxy to handle API requests and caching, ensuring secure API keys and rate-limit handling. My goal is to get the app fully functional and ready for Google Play Store publication. In my experience, a common mistake in API integration is not properly handling rate limits and caching, which can lead to errors and slow performance, so I'd make sure to implement these features correctly. As a result, the client can expect a fully functional and tested app, with a working demo APK and production-ready AAB, along with API/backend configuration documentation and Play Store submission assistance, all within the agreed scope and budget.
₹7,000 INR in 7 days
4.1
4.1

Hi, I'd be glad to help complete the remaining work on your existing Android railway information app "ChaloTrain" and take it to Google Play Store publication. I will utilize my Android and backend development skills to integrate the necessary railway APIs, complete the backend/API proxy, and ensure a seamless user experience. I will work with your existing project ZIP as the base project, preserving the existing working UI and navigation. My approach will involve completing the API integrations, including PNR API, Live Train Status API, Train Schedule API, and others, as well as implementing API caching and rate-limit handling where required. I will also ensure secure API keys, complete testing, and provide a working demo APK before final release. I can cover: • Updated Android source code • Backend/source code • Working demo APK • Production signed AAB • API/backend configuration documentation • Play Store submission assistance I work with clear daily progress updates and honest scoping. Please share your existing project ZIP and confirm the scope, and I can get started right away. Best regards, Gagan
₹7,000 INR in 5 days
4.2
4.2

Hi, I can complete your existing **ChaloTrain Android project** without rebuilding it from scratch. I have experience with **Android/Java/Kotlin, Flutter, PHP/Laravel, REST APIs, backend development, and Google Play Console**. I can handle the remaining API/backend integration, including PNR, live train status, schedules, trains between stations, seat availability, fare enquiry, station/classes APIs, secure API keys, caching/rate limits, error handling, testing, production AAB and Play Store submission assistance. I can target **10–15 days**, provided the existing project is in the stated condition and the required railway API access/credentials are available. I’m comfortable with the **₹10,000 fixed budget** for the agreed scope. Please share the **project ZIP and confirm whether the required railway APIs/API credentials will be provided**. I’ll review the project first and confirm the exact timeline before starting. Thanks, Vikas
₹1,500 INR in 15 days
4.2
4.2

With a broad yet specialized set of skills and over eight years building high-quality applications, I am confident in my ability to meet your requirements for the ChaloTrain app. Having worked on wide-ranging projects including backend/API development, rapid API integration and Google Play Console submission, I have honed my abilities to complete your requested tasks efficiently. Moreover, my extensive Android/Kotlin experience coupled with an understanding of Jetpack Compose will allow me to flawlessly navigate your existing ZIP project without redesigning or jeopardizing its functionality. As a Full-Stack Software Engineer with an emphasis on AI, I am well-versed in not only designing frontend interfaces but also developing secure backend infrastructures, caching mechanisms (which you require), load handling/distribution, API key-safeguarding and various other production necessities. This exposure extends to mobile development, databases managements and deployment on AWS Cloud. My profile also boasts proficiency in Flutter (the framework your project is built upon) so your requested end product will align seamlessly with your vision and expectations.
₹7,000 INR in 7 days
4.2
4.2

Hi, I’m an experienced Android/Kotlin and backend developer and can complete your existing ChaloTrain project using the provided ZIP as the base—not rebuild it from scratch. I have experience with Kotlin, Jetpack Compose, REST APIs, backend/API proxy development, API integrations, RapidAPI, secure API-key handling, testing, and Google Play Console publishing. I’ll review the existing project first, preserve the current UI/navigation, integrate the required railway APIs, remove mock data, implement proper loading/error/timeout handling, optimize caching/rate limits, test real API responses, and resolve release-blocking issues. I can provide the demo APK, updated Android and backend source code, production signed AAB, configuration documentation, and Play Store submission/publishing assistance. Budget: ₹10,000 fixed as specified. Estimated completion: 7–10 working days, subject to API availability and Play Store review. Before starting, I’ll review the ZIP and confirm the scope is technically achievable within the agreed budget. One clarification: do you already have the railway API provider/RapidAPI subscription and credentials for all eight required integrations, or should I help identify the appropriate APIs first?
₹9,000 INR in 7 days
4.0
4.0

One thing to settle first, because it decides everything else: Indian Railways has no free public API, so PNR, live status and seat availability have to come from a licensed third-party provider (paid per call). I'll help you pick one and put it behind your own proxy. Plan on your existing ZIP (no rebuild, no redesign): a small Node proxy holding the API keys server-side, with caching per endpoint (schedules cache for hours, live status for about a minute) to keep your API bill low and handle rate limits. Then wire every screen to it, replace the mock data, and add proper loading, error, empty and offline states. Demo APK with real PNR + live status in 3 days, then the remaining APIs, device testing, signed AAB, docs and Play Console submission. Have you already chosen a railway API provider, and do you have a Play Console developer account set up? Aakaash
₹12,500 INR in 3 days
3.4
3.4

Hi, I can take your existing ChaloTrain Android ZIP and complete the remaining Android, backend, API integration, testing, and Google Play release work without rebuilding the app from scratch. I have experience with Android development using Kotlin, Android UI, REST APIs, backend integration, API authentication, caching/error handling, and production builds. I can also work with Jetpack Compose and RapidAPI-style integrations, including securely keeping API keys on the backend rather than exposing them in the Android client. For ChaloTrain, I’ll: * Review and set up the existing ZIP first * Preserve the current UI/navigation and fix compilation issues * Integrate the required railway APIs through a secure backend/API proxy * Implement PNR, live status, schedules, station/train data, availability, fares, and classes * Remove mock/demo data and handle loading, errors, timeouts, offline states and rate limits * Test real API responses on a physical Android device * Provide a working demo APK * Generate the production signed AAB * Assist with Google Play Console submission and publishing I will review the ZIP before proceeding and confirm the existing codebase can support the agreed scope. Budget: ₹10,000 fixed is acceptable, following your proposed milestones. I will not request additional payment for the agreed scope. Any genuinely out-of-scope work will be discussed and approved first.
₹10,000 INR in 7 days
2.8
2.8

Hi, Albert here I have experience with Android/Kotlin, Jetpack Compose, backend/API integration, RapidAPI, and Google Play Console. I can work directly from your existing ChaloTrain ZIP without rebuilding the UI, completing the railway APIs, backend proxy, secure keys, caching/rate limits, error states, testing, and production release. I’ll first review the existing project, fix compilation issues, connect and test real APIs, remove mock data, validate the app on a real Android device, then prepare the signed AAB and assist with Play Store publishing. Estimated completion: 7–10 days. ₹10,000 fixed budget is acceptable for the agreed scope. Can you share the existing ZIP so I can review the codebase before starting?
₹7,000 INR in 7 days
3.0
3.0

Hi, I am Muheebwa. I understand you have a working ChaloTrain Android project and need the railway APIs completed behind a backend proxy, covering PNR, Live Train Status, Schedule, Trains Between Stations, Seat Availability, Fare, Live Station, and Train Classes, with caching, rate limit handling, secure keys, loading and error states, mock data removed, real device testing, then a signed AAB and Play Store submission. What usually matters most here is the backend proxy, since no railway API key can live in the Android client, and the proxy also gives you one place to cache responses and smooth out rate limits from RapidAPI providers. A common issue when wiring a real API into an existing UI is that the app expects a different response shape than the provider returns, so error and empty states that never showed before start crashing once real data flows in. The tricky part is rate limits, since free and low tier railway APIs restrict calls per minute, and a naive implementation will get blocked during peak testing. My approach would be to keep the existing UI and navigation, build a small backend that proxies each endpoint with key security, caching, and retry logic, wire the APIs into the current screens, add loading, error, empty and timeout states, test on a real device, then deliver a demo APK, signed AAB, and Play Store publishing support within the fixed budget. Looking forward to hearing from you.
₹8,000 INR in 2 days
2.4
2.4

Hi, I can take your existing ChaloTrain Android project ZIP and complete the remaining API, backend, testing and Play Store work without rebuilding the app. • Android/Kotlin and Jetpack Compose development • Railway API integration through a secure backend/proxy • PNR, live status, schedules, station, fare, availability and classes APIs • RapidAPI/API integration, caching and rate-limit handling • Secure API key management outside the Android client • Real loading, error, timeout and offline states • Remove all mock/demo data and test real API responses • Fix compilation issues and release-blocking bugs • Test on a real Android device • Deliver demo APK, signed production AAB and source code • Assist with Google Play Console submission and publishing I’ll first review the provided ZIP and confirm the existing structure and agreed scope before development. Estimated completion: 2–7 days, depending on the railway API access and existing project condition. ₹7,000 fixed budget is acceptable for the agreed scope and milestones. I will not request additional payment for agreed work. I can start immediately after reviewing the project.
₹7,000 INR in 7 days
2.1
2.1

Hi, hope you are well. I understand your project details. I will follow instructions and keep you updated. I am a reliable freelancer with 10+ years of experience in PHP, Mobile App Development, Android, Kotlin, API Integration and I helped many clients in the past. Visit my profile to check my latest work and reviews from past clients. Looking forward to working with you, connect in chat. Regards, Olusoji
₹15,000 INR in 5 days
1.7
1.7

Navi Mumbai, India
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