
Closed
Posted
Paid on delivery
**Update Agreement in Private Android E-Signature Sending App – Firebase/SendGrid** I have an existing private Android application that I use to send electronic agreements to customers. Only I use the Android application. Customers do not download or install the app. I use the app to send the agreement to a customer by email. The customer opens the agreement from the email, completes and electronically signs it, and the completed signed agreement is automatically returned to my designated email address as a PDF. The application currently functions properly and appears to use Firebase and SendGrid. I need an experienced Android/Firebase developer to update the agreement wording used by the existing system while preserving the complete working process. The developer will need to: * Inspect the existing Android APK and current system. * Determine whether the agreement wording is stored in the Android app, Firebase, backend code, or another template. * Replace the current agreement wording with the revised agreement that I will provide. * Preserve the private Android app that I use to send agreements. * Preserve the customer’s ability to open, complete, and electronically sign the agreement without installing an application. * Preserve generation of the completed signed PDF. * Preserve automatic delivery of the signed PDF to my designated email address. * Preserve the existing Firebase and SendGrid workflow. * Rebuild the private Android APK if necessary. * Test the complete process from sending the customer email through receiving the completed signed PDF. * Make a complete backup before changing anything. * Avoid changing any unrelated part of the functioning system. Important security and delivery requirements: * Do not add tracking, analytics, advertising, background services, or unnecessary Android permissions. * Do not change Firebase security rules, SendGrid settings, API keys, or unrelated services without prior approval. * Explain exactly what access is required before access is granted. * Provide the complete updated source code and final APK. * Provide a written list of all files and functions changed. * The updated Android application must not request access to contacts, SMS, phone calls, microphone, camera, location, photos, or unrelated device files. * Testing must use sample information rather than actual customer information. The original developer is no longer available. I currently have the working Android APK and examples of completed signed agreements.
Project ID: 40677285
147 proposals
Remote project
Active 5 hours ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
147 freelancers are bidding on average $135 USD for this job

Hello, Do you have the source code of your Android app ? Ping me so we can discuss and start the implementations right away. i am a native Android applications developer with over 8 years of experience developing Android mobile applications. I have completed more than 515 projects. I am confident that I will provide you with quality work and the best software services. Let's chat to proceed.
$100 USD in 5 days
8.9
8.9

Hi. As an Android/Firebase expert, I can update the agreement wording while preserving the complete working signing flow exactly as it is. My first step will be to back up the current system and trace where the agreement template is actually stored—inside the Android app, Firebase, backend code, or the SendGrid/email workflow—before changing anything. I am very familiar with Android, Firebase, SendGrid, PDF generation, email workflows, backend APIs, and private APK deployment. I will only modify the files/functions required for the agreement update, then test the full flow using sample data: send agreement → customer opens and signs → PDF generated → signed PDF returned by email. I will not add analytics, tracking, permissions, or change Firebase/SendGrid configuration without your approval. If only the APK is available and the original source code cannot be recovered completely, I will identify that clearly before making changes and explain the safest path forward. I can start immediately. Thanks for your attention.
$50 USD in 1 day
7.3
7.3

I will update the agreement wording in your existing private Android e-signature system without disturbing its current workflow. I’ll first make a complete backup, inspect the APK and any available source/backend configuration, and determine whether the agreement template is stored in the Android app, Firebase, SendGrid-related code, or another service. I’ll then replace only the required wording and preserve customer browser-based completion and signing, signed PDF generation, and automatic delivery to your designated address. I’ll explain the exact access needed before starting, using the minimum permissions possible. I will not change Firebase security rules, SendGrid settings, API keys, permissions, analytics, tracking, or unrelated services without approval. If rebuilding is required, I’ll provide the updated APK and complete source code, along with a written list of every changed file and function. Testing will use sample customer information and cover the full flow from sending the agreement through receiving the completed signed PDF. Do you already have the revised agreement wording ready in a document or fixed text format? Muhammad Saad
$180 USD in 3 days
7.0
7.0

The agreement template must be located before touching the working Firebase and SendGrid flow. I’ll first inspect the APK, sample agreement, signed PDF, and email path without needing customer data or credentials. Within one day, I’ll provide an access list, backup plan, and map of where the wording is generated. If the original source is unavailable, I’ll confirm what can be recovered before changes, since an APK may not reproduce the exact project. I’ll then update only the template, rebuild if needed, and test the full signing and PDF-return process with sample data. The first milestone can be the read-only assessment, released only after you receive the written findings. Do you have any source-code archive or Firebase project access, besides the APK?
$140 USD in 7 days
7.0
7.0

Hi, I reviewed the request to update the agreement wording in your private Android e-signature sending app while keeping the full Firebase and SendGrid workflow working end-to-end. I’ll inspect the existing APK with Android Studio, trace where the wording template lives (Android SDK/Java code, Firebase content, or other storage), then replace only that text/asset while preserving the same PDF generation and automatic return to your designated email. I’ll keep permissions, keys, Firebase security rules, and SendGrid settings unchanged, make a full backup before modifications, and test using sample agreements to confirm the signed PDF delivery. Let’s discuss here now.
$150 USD in 7 days
7.1
7.1

Hello!! Your Android signature system can be updated with a more reliable signing workflow, improved document handling, secure SendGrid notifications, and a stable experience across supported Android devices. * Which parts of the existing signature system need to be updated? * How are documents currently generated, signed, and stored? * What email notifications should be sent through SendGrid? The solution will include Android application updates, digital signature workflow improvements, document/PDF handling, SendGrid email integration, API connectivity, authentication, error handling, secure data processing, testing, and deployment support. Relevant Android, PDF, API, email, SendGrid, and document-management projects have been completed before, improving existing applications while preserving their working functionality and data flow. Let us review the current application and required changes so we can prioritize the signature workflow and complete the update efficiently. Best regards Farhin B
$100 USD in 10 days
6.8
6.8

Hello, With my extensive background in Android and your existing working APK and signed agreements, I am in a prime position to tackle this project. I have worked on applications with similar features, using tools such as Firebase and SendGrid. Precisely inspecting your current system, I will determine how the agreement wording is stored and replace it with the revised version you'll provide, ensuring complete preservation of your private app that your customers find easy to use just as it is now. Not only will I maintain the existing workflow of generating signed PDFs that are automatically sent to your email, but I also promise not to introduce any tracking, analytics or advertising systems that might affect your security requirements. Furthermore, you can count on my ability to maintain clean code and avoid unnecessary Android permissions or changes to unrelated parts of the working system. Finally, beyond delivering upon project completion, I'm more than happy to provide thorough documentation of changes made along with access details and complete updated source code. Also, to ensure we mitigate risks during this process without data loss, I'll make certain we have a solid backup system before we make any changes. Commissioning me guarantees a seamless transition from the old agreement wording to the new one while assuring all working processes remain intact+ Thanks!
$155 USD in 1 day
6.1
6.1

Greetings, I understand the critical need to update the agreement wording in your existing Android E-Signature system while ensuring the seamless functionality of the entire process. With expertise in Android App Development, Firebase, and SendGrid integration, I am well-equipped to handle this task effectively. My approach involves meticulous inspection of the current system, identifying the storage location of the agreement wording, replacing it with the revised content provided by you, and testing the complete process extensively to ensure flawless operation. I prioritize security and privacy, guaranteeing no unnecessary additions or changes without your approval. With a proven track record in Mobile App Development and a portfolio showcasing successful projects, I am confident in delivering the desired results efficiently. Could you please clarify your top priority or business goal for this update? Let's discuss further in an open chat to finalize the scope seamlessly. Best regards, Muhammad Anas Khan
$90 USD in 4 days
5.8
5.8

I’m a senior Android engineer with 9+ years of experience working with Android, Firebase, APK analysis, backend integrations, email workflows, and production app maintenance. I will not add analytics, tracking, extra permissions, or make unrelated Firebase/SendGrid changes. I can also provide the updated source code, final APK, and a clear list of every file/function changed. You can check my client reviews to see the quality of my previous work. I’m available to start immediately.
$250 USD in 3 days
5.7
5.7

Hi, I see that you need to update the agreement wording in your existing Android E-Signature app while maintaining the entire functionality, such as sending the agreement and ensuring the automatic delivery of signed PDFs. It's crucial that the current workflows with Firebase and SendGrid remain intact throughout this process. To execute this effectively, I will first audit the existing system, identify where the agreement wording is stored, and then replace it with your provided content—all while keeping the app's performance reliable and user-friendly. I'll ensure the final APK adheres to your security requirements and testing will be conducted with sample data. Could you please confirm whether the existing APK is available for inspection and if you have any specific format for the updated agreement? I typically follow a clean architecture approach, which not only supports good performance but also ensures a seamless experience for users right from day one. Let's connect to outline the details, timeline, and any additional requirements you may have. Regards, Mohammad
$60 USD in 1 day
5.4
5.4

Hello There! I’m Md Toriqul Islam, an experienced Android/full-stack developer specializing in Android apps, Firebase, email integrations, APIs, and secure application workflows. I have rich experience inspecting existing applications, updating backend/templates without disrupting working functionality, handling Firebase integrations, email workflows, PDF generation, and rebuilding/testing Android APKs. I understand you need only the agreement wording updated while preserving the complete existing process—from sending the customer email and e-signature through signed PDF generation and automatic email delivery. I’m skilled in Android, Firebase, SendGrid, backend APIs, PDF workflows, security, and end-to-end testing, with a careful approach to minimal changes. A few questions: 1) Do you have the original Android source code, or only the existing APK and Firebase/SendGrid access? 2) Do you have access to the Firebase project and the backend/template files currently generating the agreement? 3) Can you provide a sample completed agreement and the revised agreement wording for comparison? I’ll make a complete backup first, use only sample customer data, document every changed file/function, and provide the updated APK and source code. Looking forward to hearing from you. Best regards, Md Toriqul Islam
$100 USD in 3 days
5.6
5.6

Hello, I understand you need to update only the agreement wording in your existing private Android e-signature workflow while keeping the entire sending, signing, PDF generation, and email delivery process unchanged. I can first inspect the APK and identify where the agreement template/content is stored, then make a backup before changing anything. I’ll update only the required wording, preserve the existing Firebase/SendGrid workflow, rebuild the APK if needed, and test the complete flow using sample customer data. I’ll also provide the complete updated source code, final APK, exact list of changed files/functions, setup details, and ensure no unnecessary permissions, tracking, analytics, or unrelated services are introduced. I’m ready to review the APK and existing signed agreement sample to determine the safest update approach. Thanks
$140 USD in 7 days
5.6
5.6

Hi, I can see the hidden risk here: the agreement text is likely embedded somewhere in the APK, Firebase, or a backend template, and changing it without disturbing the signing flow is the real challenge. I’ve worked on Android/Firebase systems with SendGrid-style email workflows, and I can inspect the existing app, locate the wording source, update only the agreement content, and keep the private send → sign → PDF return process intact. I’ll first make a full backup, review the APK and connected services, then trace where the agreement is generated so I can replace the wording safely and rebuild the APK if needed. I’ll also test the full flow using sample data only, and provide the updated source, final APK, and a clear file/function change log. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. Do you have the source code, or only the APK, and is agreement generation handled by Firebase functions or backend endpoints? Before I start, could you share whether you have any source code or just the APK, and whether Firebase functions or backend endpoints are involved in agreement generation? Looking forward to your reply so we can finalize the exact plan. Best regards, Asad
$75 USD in 3 days
5.3
5.3

With extensive experience in Android app development and Firebase integration, I understand the need to update the agreement wording in your private e-signature app while maintaining its functionality. Could you share the latest agreement template for implementation clarity? Regards, Yogesh Kumar
$80 USD in 10 days
5.3
5.3

★•══•★ Hi client ★•══•★ I’ve gone through your project description and it looks like a solid challenge. I’m confident I can handle it without breaking a sweat. My approach is simple: I focus on the core problem first, then build around it. No over-engineering, no unnecessary extras. Just clean, working results that you can actually use and maintain. What you get from me is clear communication, honest timelines (even if I’m a bit too optimistic sometimes), and a genuine interest in making this work well. I don’t disappear mid-project — that’s just bad manners. I’d love to hear more about your specific goals here. What’s the one thing you want to be absolutely sure about before we start? Best regards, Rico
$140 USD in 7 days
5.0
5.0

Hi, You need the agreement text updated in your private Android e-sign flow — Firebase + SendGrid stay as they are. Customers still sign from email (no app), PDF still generates and lands in your inbox. Nothing else changes. I’ll start from your APK + a sample signed PDF, find where the wording lives (app, Firebase, or template), back everything up, swap in your new text, rebuild the APK if needed, and run a full send → sign → PDF email test with sample data only. I’ll list required access before you grant it, and hand over updated source (if available), final APK, and a change list. No extra permissions, tracking, or key/rule changes without your OK. Price: $30 Timeline: a few days once I have the APK, new wording, and access notes. Best regards
$100 USD in 7 days
4.9
4.9

With over 8 years of experience as an Android developer, I have a deep understanding of the framework and can hit the ground running for your E-Signature system update project. I have successfully managed and delivered over 200 projects in my career, including similar ones involving Firebase and SendGrid. Rest assured, I will carefully inspect your existing APK, determine the storage location for the agreement templates, and make strategic replacements with the revised agreements you provide. Regarding security and delivery requirements, I completely understand your concerns and respect your privacy. As an ethical developer, I do not engage in adding unnecessary features or interfering with unrelated functionalities, and that includes not changing key components like Firebase security rules or SendGrid settings without your explicit approval. You can trust me to work with utmost diligence and not to alter any part of the functioning system which is unrelated to our immediate task.
$150 USD in 7 days
4.9
4.9

Hi there, Thank you for providing a detailed overview of your requirements for updating the agreement wording in your private Android E-Signature system. I understand the importance of maintaining your established workflow, security protocols, and user privacy while making this update. With extensive experience in Android development, Firebase integration, and secure PDF generation, I am confident in my ability to deliver a seamless update without impacting your current process. I have successfully managed similar projects where updating dynamic content—such as legal agreements—required precise identification of where templates are stored (app, backend, or Firebase) and careful changes without disrupting core functionalities. My approach will begin with a thorough inspection of your existing APK and workflow to pinpoint exactly where the agreement text resides. I will ensure a full backup is created before making any changes and communicate all access requirements clearly with you. Once the revised agreement wording is provided, I will update only the necessary files or templates, preserving every aspect of the customer experience—from email delivery, web signing, and PDF generation, to the automatic return of signed documents via SendGrid. Throughout the process, I will adhere strictly to your security and privacy requirements, ensuring no additional permissions, analytics, or background services are introduced. Upon completion, I will provide the updated APK, source code, and a precise change log. I look forward to collaborating with you to ensure your E-Signature system remains reliable, secure, and up-to-date. Please feel free to share the APK and sample agreements so I can begin my review. Best regards, DemiVision, LLC
$30 USD in 5 days
4.6
4.6

I’ve built and maintained Firebase-backed Android apps with SendGrid email flows before, so this is straightforward. I’ll start by decompiling the APK to locate the agreement source—likely in Firebase Firestore as a template or in Android resources—which I’ll replace with your new wording. The signing PDF generation and SendGrid email routing will remain untouched; I’ll only update the content layer and rebuild the APK. I’ll test the full flow end-to-end using synthetic data, document any changes, and provide the updated source and APK. Thanks, Andrii
$175 USD in 3 days
4.2
4.2

With over X years of honing my skills in Mobile App Development(iOS & Android) of systems similar to yours, I firmly believe that I am very much able to successfully update your e-signature system. Specifically, my extensive experience in handling complex digital products and my expertise with the exact technologies that your existing system utilizes (Android, Firebase, SendGrid, to name a few) give me a solid understanding of what is required from this project. My methodical work approach begins with an elaborate inspection of the existing APK and backend code. Once I've identified the sections that store and generate the agreement wordings and PDFs, I will tactfully replace the words as provided by you - all while preserving the complete functioning system and never compromising security or delivery requirements. Testing is an essential part of my process- I plan on rigorously testing each step, from sending customer emails to receiving completed signed PDFs using sample information, thereby giving a hassle-free experience. Finally, my commitment extends beyond just delivering the functional product. I understand the importance of documentation- therefore,I can ensure a well-detailed list of all files and functions changed as well as providing complete updated source code(Again maintaining integrity and knowledge confidentiality).
$30 USD in 5 days
4.0
4.0

Queens, United States
Member since Nov 27, 2025
$250-750 USD
$250-750 USD
$3000-5000 USD
$50-100 USD
₹750-1250 INR / hour
$1500-3000 USD
$30-250 USD
₹1500-12500 INR
₹1500-12500 INR
$30-250 USD
₹75000-150000 INR
$2-8 USD / hour
$10-30 USD
₹600-1500 INR
$750-1500 USD
₹12500-37500 INR
₹1500-12500 INR
$250-750 USD
min $50 USD / hour
₹12500-37500 INR
₹75000-150000 INR
$40-80 USD