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I want a mobile application that lets contractors and residential clients manage building contracts from start to finish, all on their phones. The core of the app is a living contract: either side can propose changes mid-project, but nothing updates until both parties tap “accept”. Once approved, the amended clauses instantly recalculate and display the new running total so everyone stays in sync on scope and cost. I need this to work seamlessly on both iOS and Android, so a cross-platform stack such as Flutter or React Native makes sense, provided the finished builds feel completely native. Secure sign-up and log-in are required for both contractors and clients; roles determine who can create, edit, or merely view agreements. Because clear deliverables help everyone, here’s what I expect to receive: • Universal mobile app (iOS & Android) compiled and ready for store submission • Role-based authentication tied to a cloud database • Contract editor supporting text, numbers, photos and file attachments • Change-request workflow with dual approval and timestamped history • Automatic running-total calculation, visible to both parties at all times • Source code, build instructions, and a short hand-over session Push notifications for pending approvals and a simple administrator dashboard would be a welcome bonus if they can be added without delaying the core release. I’m aiming for a clean, intuitive interface; reliability is more important than flashy extras. If you’ve built contract, finance, or workflow apps before and can hit these marks, I’d like to see how you’d approach the build and timeline.
Project ID: 40490254
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190 freelancers are bidding on average £3,907 GBP for this job

With over a decade of experience in full-stack architecture and high-scale systems, I understand your need for a dynamic construction contract app that streamlines the management of building contracts for contractors and residential clients on their mobile devices. My background in developing high-security systems and scaling applications for over 1 million users directly aligns with the complexity of your project goal. To ensure scalability and security for your mobile application, I recommend implementing a role-based authentication system tied to a cloud database for secure access control. Drawing from my experience in building Telegram Mini Apps serving a large user base, I am confident in my ability to deliver a seamless cross-platform solution using Flutter or React Native that feels completely native on both iOS and Android. I invite you to reach out to discuss how we can bring your dynamic construction contract app to life, meeting your specifications and exceeding your expectations. Let's collaborate to create a reliable and efficient solution that meets your project requirements within the budget and timeline provided.
£4,000 GBP in 45 days
8.3
8.3

Hello We are Ominfowave Software Services Pvt. Ltd., and we have an expert mobile application development team with 10+ years of experience in building reliable, high-quality apps. ? Our Core Expertise •Android App Development (Kotlin / Native) •iOS App Development •Flutter & FlutterFlow (Cross-platform) Our team understands not just development, but also performance, user experience, scalability, and timely delivery. ? What We Can Deliver ✔ Social media integrations (Facebook, Google, Twitter, etc.) ✔ Google APIs (Maps, Places, FCM, YouTube, Analytics) ✔ Offline & cloud database solutions (SQLite, MySQL, Realtime DB) ✔ Secure payment integrations (Stripe, PayPal, Braintree) ✔ Ad monetization (AdMob, Appodeal, MobVista) ✔ In-App Purchases ✔ Location tracking & real-time features ✔ Chat & messaging applications ? App Types We’ve Built •Social Media Apps •Shopping & eCommerce Apps •Job Portals •Taxi / Carpooling Apps •VPN & Utility Apps •Travel & Booking Apps •Live Streaming Apps •AI & Machine Learning–based Apps ? Why Work With Us •10+ years of hands-on experience •Clean, scalable & secure code • Clear communication & regular updates • On-time delivery with quality assurance • Long-term support after project completion We would love to work with you and build a long-term, trusted business relationship. Let’s discuss your idea and turn it into a successful application Warm regards, Vishal Nasit Ominfowave Software Services Pvt. Ltd.
£3,000 GBP in 30 days
8.4
8.4

Hi — Elias here from Miami. The real challenge here is not just building a contract editor, but making the approval flow trustworthy so both contractor and client always see the same version, cost total, attachments, and timestamped change history. Apps like this usually fail when edits overwrite live agreements without a clear pending/approved state. I’d approach this with Flutter or React Native, role-based authentication, cloud database storage, file/photo uploads, a versioned contract model, dual-approval change requests, push notifications, and automatic recalculation logic tied to approved changes only. A lightweight admin dashboard can also be added as a later or parallel milestone. I’ve worked on workflow and finance-style apps involving approvals, user roles, document handling, notifications, dashboards, and secure backend architecture. Q1 – Do you already have standard contract templates, or should template creation be included? Q2 – Should approved contracts generate downloadable PDFs? Q3 – Do you want payments/deposits included in v1, or only contract management? Happy to structure this into a clean MVP and milestone plan. Looking forward to hearing from you.
£4,000 GBP in 7 days
8.2
8.2

Hello, Greetings Hope you are doing well. I am a Mobile Application developer with over 5 years of experience. I am confident in my ability and skills to develop high-quality Mobile apps and would like to work on your construction contract management app project. I will complete the work as per your requirements. I want to discuss more this project to prepare the final concept. So let’s discuss this in detail over chat then will make plans to start work on it. Waiting for your earliest reply. Thanks. Shubham
£3,000 GBP in 35 days
8.0
8.0

Hi there, I will deliver your construction contract app — cross-platform via Flutter, with role-based auth, the contract editor with attachments, dual-approval change-request workflow, and automatic running-total recalculation on every accepted amendment. For the living contract engine, I will structure each clause as a versioned document node so every proposed change creates a diff against the current version. Both parties see exactly what changed before tapping accept, and the full amendment history stays timestamped and immutable — critical if a dispute ever reaches arbitration. Questions: 1) Do you have a preferred cloud backend — Firebase, AWS Amplify, or something else — or should I recommend one based on your scaling needs? Looking forward to discussing further. Best regards, Kamran
£3,305 GBP in 30 days
7.4
7.4

Hello, We are a full-stack development team specializing in mobile applications, workflow automation platforms, and contract management systems. Your concept of a living construction contract with dual-approval change management is exactly the type of business-critical application we enjoy building. For this project, we recommend Flutter with a secure cloud backend (Firebase or AWS) to deliver a truly native experience across both iOS and Android while maintaining a single codebase. The platform will include role-based authentication for contractors and clients, a dynamic contract editor supporting text, pricing, photos, and document attachments, along with a complete change-request workflow where modifications only take effect after approval from both parties. Once approved, the system will automatically recalculate contract values and maintain a timestamped audit trail of every change, ensuring complete transparency throughout the project lifecycle. Our proposed timeline is 8–12 weeks for the MVP, including planning, UI/UX design, development, testing, deployment preparation, and handover. We can also include push notifications, an admin dashboard, and future enhancements such as digital signatures, milestone payments, and reporting modules. We would be happy to discuss the workflow in more detail and provide a phased development plan with milestones and budget estimates. Regards, Ludiac Solutions
£4,000 GBP in 60 days
7.1
7.1

Hi, The trickiest part of a living contract here isn't the editor — it's keeping the running total in sync when either side proposes changes but nothing commits until both tap accept. I'd model amendments as immutable change-requests so the total only recalculates on mutual acceptance, never mid-edit, with full timestamped history. Stack I'd use: - Flutter for genuinely native iOS & Android builds - Supabase or Firebase for role-based authentication tied to a cloud database (contractor, client, view-only) - Real-time listeners so pending approvals and the new total update instantly on both phones I work in Flutter and React Native daily and hold a 5-star rating across 70+ Freelancer projects, mostly mobile. One thing to pin down: should a rejected change-request stay visible in the history, or disappear entirely? Asif
£5,000 GBP in 14 days
6.4
6.4

Hello, I will develop your CONSTRUCTION CONTRACT MOBILE APPLICATION FOR BUILDERS AND CLIENTS for Android and IOS both platforms with Web admin panel. I am Tulsiram. I have 10 years of experience working as Native and Crossplatform mobile application developer. I am understood your requirements. I am glad if we are working together. If you interested then let's connect. I will provide you Daily updates ,source code after development completed, 1 Year maintenance Support in following Steps: I will available daily 10-12 hours in Working days for you. I will provide you regular updates according to which modules we will decided. After approval each module by you then i will provide your complete source code of your project and will shift on your Domain. Thanks
£3,000 GBP in 35 days
6.6
6.6

Hello, I understand you need a cross-platform iOS and Android app for contractors and residential clients to manage living building contracts, with role-based access, contract editing, attachments, dual-approval change requests, timestamped history, and automatic running-total recalculation. I have experience building mobile workflow, finance, and document-management apps using Flutter/React Native, secure authentication, cloud databases, file storage, role permissions, push notifications, audit trails, and clean handover documentation. I will build a reliable native-feeling app with contractor/client roles, structured contract clauses, change-request approval logic, cost recalculation, shared history, attachment handling, optional admin dashboard, store-ready builds, source code, build guide, and a hand-over session. Q1: Should contracts support digital signatures or only tap-to-accept approvals? Q2: Do you want PDF export of the approved contract and amendment history? Q3: Do you prefer Flutter, React Native, or should I recommend the best stack after reviewing your design needs? Best regards, Stratos
£4,000 GBP in 7 days
6.7
6.7

Hello, I hope you are doing well. I understand that you are looking to build a DYNAMIC CONSTRUCTION CONTRACT MOBILE APPLICATION, and I would be happy to help. I have extensive experience in designing and developing applications and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.
£3,000 GBP in 15 days
7.0
7.0

Hi there, We understand you're looking to develop a comprehensive mobile application for managing building contracts between contractors and residential clients, with a core feature of a living contract that allows for proposed changes and dual approval. Our team at Webbook Studio has experience with similar projects, such as the development of a music voting mobile app using React Native and a furniture store mobile shopping app using Flutter. We're proficient in cross-platform stacks like Flutter and React Native, ensuring a native feel on both iOS and Android. We'll deliver a universal mobile app, role-based authentication, contract editor, change-request workflow, and automatic running-total calculation, along with source code and a hand-over session. One question: would you prefer to integrate push notifications and an administrator dashboard into the initial release or prioritize the core features for a timely launch? Feel free to message us to discuss the details! — Webbook Studio
£3,800 GBP in 30 days
6.1
6.1

⭐⭐⭐⭐⭐ Build a Mobile App for Managing Building Contracts Seamlessly ❇️ Hi My Friend, I hope you're doing well. I've reviewed your project needs and see you are looking for a mobile app to manage building contracts. Look no further; Zohaib is here to help you! My team has successfully completed 50+ similar projects for mobile applications. I will create a universal app that allows both contractors and clients to manage contracts efficiently. Using Flutter or React Native, I will ensure a smooth experience on both iOS and Android. ➡️ Why Me? I can easily build your mobile application as I have 5 years of experience in mobile app development, focusing on contract management, role-based authentication, and real-time updates. My expertise includes cross-platform development, secure sign-up processes, and user-friendly interfaces. ➡️ Let's have a quick chat to discuss your project in detail. I would love to show you samples of my previous work and how I can bring your vision to life. Looking forward to chatting with you! ➡️ Skills & Experience: ✅ Mobile App Development ✅ Flutter Development ✅ React Native ✅ Role-Based Authentication ✅ Cloud Database Management ✅ Contract Management Systems ✅ User Interface Design ✅ Real-Time Data Updates ✅ Push Notifications ✅ Workflow Automation ✅ Secure Sign-Up Processes ✅ Testing & Debugging Waiting for your response! Best Regards, Zohaib
£3,400 GBP in 2 days
5.6
5.6

Hello! This is James from Hollywood, and I’m excited about your Dynamic Construction Contract App project. I’ve carefully read your description and understand the need for an effective platform for contractors and clients to manage building contracts seamlessly. With over 15 years of experience in mobile app development and a strong background in React Native and Flutter, I can deliver a user-friendly, efficient application tailored to your specifications. My extensive work in developing production-grade software ensures that I create solutions that are both technically sound and practical. Could you please clarify the following questions to help me better understand the project? 1. What specific features are essential for managing contracts? 2. Do you have any preferred design styles or inspirations for the app? To achieve the project's goals, I suggest a phased approach: starting with wireframes and UX design, followed by development and thorough testing. My commitment to clear communication and structured milestones will ensure we stay aligned throughout the process. I’ve participated in the Shopify Partners Program since 2016, creating various apps and themes, including projects like Hotel Collection and USA Baseball Shop. I look forward to discussing how I can contribute to your project and deliver the perfect solution!
£4,500 GBP in 14 days
5.5
5.5

Hello, I propose a robust, end-to-end technical solution to ensure accurate calculations, security, and a native experience. Architecture -Frontend: React Native (fluid iOS and Android with a clean interface). -Backend & DB: Node.js and PostgreSQL for secure history management. -Notifications: Firebase (FCM) integrated without delaying the main launch. Key Features -Dual Approval: Strict version control. Changes remain 'Pending' with a timestamp and only update after mutual agreement. -Secure Recalculation: Centralised processing on the server to prevent device errors. The running total updates instantly. -Roles & Security: Token system (JWT) to limit permissions (editing vs. viewing) based on the user. -Attachments: Scalable cloud storage for photos and contract documents. -Timeline (6 to 8 Weeks) Wk 1-2: Backend, API, and Authentication. Bonus: Basic web admin panel. Wk 3-5: Mobile development, contract editor, and change request workflow. Wk 6: Push notifications and intensive testing of mathematical logic. Wk 7-8: Builds, delivery of documented source code, and handover session. I prioritise operational technical reliability over unnecessary aesthetic elements. Kind regards, Mauricio | ⭐ Full-Stack, AI & Digital Solutions ⭐
£5,000 GBP in 35 days
5.6
5.6

Hi, I can build your “living contract” app using a clean Flutter + real-time backend architecture focused on safe dual-approval workflow + automatic recalculation. Each contract change will be treated as a request (not direct edit) → both parties approve → system generates a new version with updated totals and full audit history. This avoids conflicts and keeps everything consistent in real time. Tech stack: Flutter (iOS/Android), Node.js or Supabase backend, WebSockets for live sync, and role-based access control. Deliverables: • Cross-platform mobile app • Real-time contract update system • Approval + versioning workflow • Backend + API setup • Deployment + documentation I’ve worked on similar approval-based workflow systems with real-time updates and can start immediately. Best regards, Abhishek
£4,000 GBP in 7 days
5.5
5.5

Hello, a living contract app where both parties approve changes before anything updates — that's a solid dual-signature workflow and I've built similar approval flows before. I'd go React Native for this, gives you true iOS and Android from one codebase without feeling like a compromise. The change-request flow would work like this: one side proposes an edit, it locks the clause as "pending", the other side gets a push notification, taps accept — only then does the running total recalculate and both screens update live. Role-based auth, timestamped history, photo/file attachments in the contract editor — all straightforward to layer in. I'd prioritise the core contract flow first, then push notifications and the admin dashboard in the final sprint. Looking forward to working with you. Mateo
£3,200 GBP in 28 days
5.2
5.2

Here’s how I’d approach this if I were starting today: the contract itself needs to be treated as the source of truth, with every amendment stored as a versioned change request rather than directly editing live terms. That makes the dual-approval workflow reliable and gives you a complete audit trail with timestamps, attachments, and previous values preserved. I’d build the mobile app in Flutter so iOS and Android stay in sync while still feeling native. First, I’d establish role-based authentication and the contract data model, then implement contract creation, editing, attachments, and running-total calculations. After that comes the approval flow, where proposed changes remain pending until both parties explicitly accept, at which point totals recalculate instantly and both users see the updated agreement. A small but important detail is handling conflicting edits and offline connectivity so users never lose changes or see inconsistent totals. I’ve built workflow-driven platforms before where approvals and data consistency were more important than UI effects, and that experience translates well here. One thing I’d like to clarify: will contracts follow a fixed template structure, or should users be able to create completely custom clauses from scratch? I’m ready to start.
£4,000 GBP in 25 days
4.9
4.9

With over 8 years of experience as a Flutter and Node developer, I am confident in my ability to create the dynamic construction contract app you need. I have a deep understanding of both iOS and Android development, and I've successfully built and deployed numerous cross-platform apps that have provided users' native experience. This background puts me in a good position to ensure we achieve the seamlessness you desire. The security aspect of your app is crucial, and as a professional, I have an unwavering commitment to securing user data. I will leverage my skills in creating role-based authentication tied to a cloud database, to provide confidential access for all parties involved. Beyond the core deliverables, I'm ready to go the extra mile and integrate functionalities such as push notifications for pending approvals and an intuitive administrator dashboard. These features will enhance user experience without causing any delays in the primary release of the app. I believe in ensuring deliverables are clear from the start, so rest assured you can expect not just a high-quality mobile app, but also the source code, build instructions, as well as an instructive session on how to utilize your new mobile app effectively. Your project requires someone who is not only skilled in app development but also understands financial workflow intricacies – that someone is me! Let's work together to create an easy-to-use yet robust solution to manage your construction contracts.
£3,000 GBP in 30 days
5.0
5.0

Hello, We've thoroughly reviewed your project details for the Dynamic Construction Contract App and are excited about the opportunity to collaborate. Your vision for a seamless cross-platform app that allows real-time contract management aligns perfectly with our expertise in intelligent systems and scalable applications. In a previous project, we developed a mobile application for a finance company that integrated dynamic contract management, real-time updates, and secure role-based authentication. This experience has equipped us with the necessary skills to meet your specifications, including the dual approval process and automatic calculations. Our 8+ years of experience in mobile and web development, particularly with React Native and Flutter, ensure we can deliver a polished, native-like experience on both iOS and Android. We excel in building robust backend systems with secure authentication, essential for your contract app's success. Our experience with AI-first, scalable solutions and our transparent, customer-centric approach guarantee that we will exceed expectations. We'd be delighted to discuss your project further. Please message us with additional details, and we will provide a comprehensive, tailored proposal within 24 hours. Looking forward to building a solution that meets your needs with reliability and elegance. Best regards, Puru Gupta
£5,000 GBP in 30 days
4.8
4.8

Hi there, This project instantly caught my eye, so I had to reach out. The idea of a mobile app for seamless contract management is intriguing. I specialize in developing user-friendly and integrated mobile applications that prioritize a smooth user experience. With my experience in building similar apps and ensuring a professional interface, I am confident I can deliver exactly what you need. Quick communication and a fast turnaround are my commitments to you. Let me know if you are available for a quick chat! Regards, Aashiq Ryneveldt
£3,000 GBP in 7 days
4.6
4.6

Stockport, United Kingdom
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