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I’m moving my existing expense-tracking mobile app into its next phase and need a full-stack developer who can jump straight into the current codebase and extend it cleanly for both iOS and Android users. The core of this sprint is personal-finance tooling: • Build monthly and per-category budgeting, spending limits, savings goals and recurring-expense handling that slot naturally into the present data models for users, expenses and categories. • Surface straightforward insights drawn from each user’s transaction history—think at-a-glance breakdowns, helpful trends and a clear “how much is left” view. • Trigger lightweight, configurable notifications when a budget is close to or over its limit or when other notable financial events occur. • Strengthen the existing analytics layer so these new data points are ready for future dashboards. Acceptance criteria • All features run smoothly on both iOS and Android with the current sign-in flow and database. • Code follows the project’s style guide, is well-commented, and ships with any schema or migration scripts needed for production. • No regression in app speed or UX; new screens feel native to the design language already in place. • A concise technical hand-off note outlining key modules and next-step recommendations. If you’re comfortable inheriting a live project and can start right away, let’s make budgeting in this app simple, fast and future-proof.
Project ID: 40653747
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hi, i can jump into your existing expense app and extend the current codebase without disrupting the existing sign in or user experience. i will add monthly and category budgets, spending limits, savings goals, recurring expenses, financial insights, and configurable budget alerts. i will also extend the analytics layer and add any required database migrations so everything works properly on both ios and android. i have solid experience with mobile apps, full stack development, databases, notifications, and financial features. i will follow your existing design and coding style, test the new flows carefully, and provide a clear technical handoff. can we schedule a quick meeting to discuss the project in detail. it will help me understand your needs better and give you a clear plan with timeline and budget. mughiraa
$120 USD in 7 days
5.1
5.1
114 freelancers are bidding on average $176 USD for this job

Hey, I understand this sprint is about extending an existing expense app without disrupting the current authentication, data models, or user experience. The budgeting tools need to feel like a natural part of what users already have, while turning their transaction history into useful, actionable financial insights. I will implement monthly/category budgets, spending limits, savings goals and recurring expenses, add clear spending and remaining-budget insights, configure threshold-based notifications, and extend the analytics layer for future dashboards. I’ll work directly within the existing codebase, include required migrations, test both iOS and Android flows, and document the key changes for handoff. I have experience extending live mobile products and can share relevant examples. One quick question: What framework is the current app built with, and can you provide the existing repository for an initial architecture review? Portfolio: https://www.freelancer.com/u/Hammadhassan21 Best Regards, Hammad Hassan
$200 USD in 10 days
7.3
7.3

Hello Greetings, After reviewing your project description, I feel confident and excited to work on this project for you. But I have some crucial things and queries to clear up. Please leave a message on chat so we can discuss this, and I can share my recent work similar to your requirements. Thanks for your time! I look forward to hearing from you soon. Best Regards.
$250 USD in 4 days
6.4
6.4

Hello, As a highly experienced full-stack developer with over a decade in the industry, I'm perfectly equipped to take on your expense-tracking mobile app project. My versatility spans across various platforms including iOS and Android, and I have a proven record of successfully working with existing codebases while rapidly and cleanly extending them. The core feature set you're looking to integrate aligns seamlessly with my skill sets. I possess strong competencies in building personal-finance tooling such as monthly and per-category budgeting, handling recurring expenses, setting savings goals, and spending limits. My knack for delivering intuitive UX/UI that feels native to design language, while ensuring no regressions in app speed and performance would prove instrumental in propelling your app forward smoothly. Moreover, my expertise in surfacing meaningful insights from transaction histories for giving concise views of financial data is well-established. I can precisely configure notification triggers for notable financial events and budget thresholds whilst strengthening the analytics layer of the existing app. In summary, partnering with me means cost-effective solutions without compromising quality or timelines , simple, fast, and future-proof budgeting features for your valued users! Thanks!
$130 USD in 2 days
6.3
6.3

Hello! As per your project post, you are looking to extend an existing expense tracking mobile app for iOS and Android with personal finance features that help users manage budgets, savings goals, recurring expenses, spending limits, and understand their financial habits more clearly. The goal is to build these features cleanly into the existing application and data structure while preparing the analytics foundation for future expansion. My focus will be on implementing monthly and category based budgets, spending limits, savings goals, recurring expenses, transaction based insights, remaining budget views, financial trends, and configurable notifications for approaching or exceeded limits. I will also ensure the new functionality integrates smoothly with your existing users, expenses, and category models without disrupting the current application. I specialize in Flutter, React Native, full stack mobile development, financial applications, notification systems, analytics, and scalable backend architecture. My focus will be on delivering a reliable and intuitive experience across both iOS and Android while keeping the existing codebase maintainable for future financial dashboards and features. Let’s connect to review the existing app and data structure so we can define the new budgeting and financial insight features without disrupting the current experience. Best regards, Nikita Gupta
$500 USD in 18 days
6.1
6.1

Hello! This is Temo, and I see you're looking to enhance your expense-tracking mobile app. Transitioning into the next phase is crucial, and I understand the importance of integrating effective budgeting features. With around 10 years of experience in mobile app development and a solid background in full-stack technologies, I can help bring your vision to life. Your goal of improving user engagement through better budget management is something I can support effectively. I'd suggest we start by defining the key budgeting features you want, like expense limits or categorization, then move on to seamless integration with analytics for tracking user interactions. Some similar things I've built include a regional budgeting app for personal finance, an internal tool for expense tracking, and a mobile app for managing subscriptions. Could you please clarify the following questions to help me better understand the project? Q1: What specific budgeting features are you envisioning for the app? Q2: Are there any existing analytics tools you're currently using that need to be integrated? Q3: What is your timeline for completing this next phase? I'm here to ensure this project meets your expectations.
$200 USD in 3 days
6.6
6.6

Hi, I specialize in full-stack mobile app development and have experience extending existing codebases seamlessly. For your expense-tracking app, I will efficiently implement budgeting features like monthly budget allocation, spending limits, savings goals, and recurring expense management. Additionally, I will provide insightful transaction breakdowns, trends, and notifications for users. I will ensure smooth functionality on both iOS and Android, maintaining the current sign-in flow and database structure. The code will adhere to your style guide, be well-commented, and include necessary schema or migration scripts. With a focus on maintaining app speed and UX, I will deliver a seamless user experience. Let's collaborate to simplify budgeting and enhance your app's capabilities.
$70 USD in 2 days
5.9
5.9

Greetings, I understand the need to enhance your expense-tracking mobile app with budgeting features for both iOS and Android users. My expertise in full-stack development, particularly in Mobile App Development and Software Development, makes me well-equipped to seamlessly integrate these new functionalities into your existing codebase. My approach involves structured requirement confirmation, controlled planning, clean implementation, rigorous testing, and milestone-based transparency to ensure the successful delivery of the project. With a proven track record in developing mobile applications, I am confident in my ability to meet your business objectives effectively. You can review my portfolio here: ⭐⭐ https://www.freelancer.com/u/CodeAnchors ⭐⭐ Could you please share more insights into your top priority or primary business goal for this project? Let's discuss further in an open chat to finalize the scope smoothly. Best regards, Muhammad Anas Khan
$90 USD in 4 days
5.8
5.8

Greetings! I specialise in cross-platform finance apps with 9+ years of experience, extending existing codebases without disrupting UX, authentication or data models. Here's how I can help: • Add budgets, spending limits, savings goals and recurring expenses • Build transaction insights, trends and remaining-budget views • Implement configurable budget alerts and financial notifications • Extend analytics and deliver production-ready migrations Which stack is the current app using? Can you share the repository and database structure?
$140 USD in 7 days
5.4
5.4

Hello, As a result of reviewing your project requirements, I understand you need a full-stack developer who can inherit the existing mobile codebase and add budgeting features without disrupting the current authentication, database, performance, or UX. I have experience with full-stack mobile development, iOS/Android workflows, database design, analytics, notifications, schema migrations, and extending live applications safely. In my opinion, the key challenge is fitting monthly/category budgets, savings goals, recurring expenses, and spending limits into the existing user/expense/category models cleanly. I would first map the current data flow, then add backward-compatible schema changes, budget calculations, configurable alerts, and analytics events so future dashboards can build on the same foundation. I would also keep the new screens consistent with the current design language and include migration scripts plus a concise technical hand-off. I have a couple of quick questions. • What framework is the current mobile app using—React Native, Flutter, native iOS/Android, or something else? • Which backend/database is currently in production? I’m comfortable taking over an existing project and can start immediately. Best regards, Carlos.
$50 USD in 7 days
4.6
4.6

Hello I just read about your expense-tracking app moving into its next phase, and it caught my attention—especially the budgeting, insights, and notification layers you need built on top of your existing data models. That’s a challenge I’ve helped clients solve before, and I’d love to do the same for you. Here’s how I’d approach it: I have strong experience with full-stack mobile development for both iOS and Android, working directly in existing codebases without disrupting current flows. I’ve built budgeting modules, recurring-expense logic, and notification systems tied to spending thresholds. I’m comfortable with schema migrations, analytics layers, and keeping performance tight. I’d love to hear more about your current stack and timeline. Cheers, AbdulHamid.
$30 USD in 2 days
4.8
4.8

Hello sir, Did go through your job description and glad to share that I have enormous experience in working with Budget Features for Expense App Budget Features for Expense App I'm a seasoned programmer and Engineer with quality experience in Flutter, React, Node.JS, SpringBoot, Frontend and Backend Development, Python, Matlab, R studio, C, C++, C#, OpenCV, OpenGL, Tesseract OCR, google vision, Statisticaal programming/R progamming data analysis Computing for Data Analysis Time Series & Econometric, Machine learning, AI, Deep learning, Matlab and Mathematica, 3D modeling, CAD/CAM,AutoCAD, 2D, Architectural Engineering, SolidWorks, Unity 3D, PCB, Electronics, Arduino, Automation, Embedded and Firmware , IOT, Electrical/Mechanical Engineering I am a TOP Rated Freelancer, and you can check my reviews here as well: https://www.freelancer.com/u/mzdesmag. Looking forward to potentially working together on this project. Thanks and Best regards, Adekunle.
$30 USD in 1 day
4.5
4.5

Hi there! I understand you need to extend an existing expense-tracking app without disrupting the current sign-in, database, UX, or performance. The main focus is adding useful budgeting and finance insights while keeping the existing codebase clean and stable. I have relevant experience with full-stack development, iOS, Android, database management, analytics, and mobile application development. I can work directly with your current architecture and extend the existing user, expense, and category models. I will add monthly and category budgets, spending limits, savings goals, recurring expenses, and clear remaining-budget views. I will also build useful transaction insights and strengthen the analytics structure for future dashboards. Notifications will be configurable for approaching or exceeded limits and other important events. I will include required database migrations, maintain the existing design language, test both platforms, and provide concise technical handover notes. check our work [[https://www.freelancer.com/u/ayesha86664](https://www.freelancer.com/u/ayesha86664) Can you share the current tech stack and repository structure so I can understand the existing mobile and backend architecture? Let me know if you’re interested & we can discuss it. Best Regards Ayesha
$115 USD in 4 days
4.4
4.4

With over five years of professional experience in Software Development and Mobile App Development, I'm enthusiastic to offer my skills for your project. My expertise includes working with React Native and Flutter, which are perfect for the cross-platform app required here. I'm adept at diving into existing codebases and comprehending them quickly which guarantees that integrating the new budgeting features effectively won't be an issue at all. Moreover, I specialize in creating simple, user-friendly and robust applications. I understand the importance of clean code and efficient database management and will ensure the project aligns effectively with your current sign-in flow and database. My proficiency in tools like Firebase can further enhance the storage and retrieval functionalities in the app ensuring a smooth user experience even with increased data. Lastly, it's essential to point out that as a full-stack developer, my skills extend beyond just mobile apps. I have hands-on experience with REST APIs as well as other technologies such as Node.js, FastAPI, Django, Laravel - expertise which would prove beneficial in strengthening your current analytics layer ensuring a solid foundation for future dashboards. I rigorously comply with style guides to ensure code readability for better understanding post-handoff.
$31 USD in 3 days
4.2
4.2

With over two decades of experience in PHP and mobile app development, I can confidently say that tackling your project is within my comfort zone. Migrating legacy codebases and enhancing existing systems are my specialties; I will be able to navigate your current expense-tracking app adeptly to introduce the budgeting features you've envisioned without disrupting any current functionalities. Whether it's working with iOS or Android, I have the breadth of knowledge to ensure a smooth user experience across both platforms. Beyond just meeting requirements, I prioritize producing clean code that is well commented and easy to understand for future maintenance. This matches perfectly with your criteria for adherence to project’s style guide and providing concise technical handoff notes. Moreover, my knack for optimizing performance and maintaining long-term stability means I can assure you that integrating these new features won’t compromise your app's speed or user experience. In fact, my goal is to add value by leveraging budgeting insights from users' transaction history and introducing lightweight notifications that encourage responsible finance management. Let me simplify your users’ budgeting process and provide actionable financial insights through your pre-existing expense-tracking app — elevating its capabilities beyond simple expense logging. Partner with me, and together we’ll make budgeting simple, fast —and most importantly— future-proof.
$150 USD in 7 days
3.8
3.8

I can help extend your expense-tracking app with budgeting features for both iOS and Android. My first step will be to review the existing codebase to understand the current architecture and data models, ensuring a smooth integration of the new features. Based in Toronto, I work quickly and am always available for updates or questions. Let’s enhance your app together.
$50 USD in 3 days
3.4
3.4

I’ve built budgeting modules over React Native + GraphQL backends with PostgreSQL schemas before, so this is right in my wheelhouse. I’ll integrate budgeting entities into your existing user-expense-category data model, add per-category limits and recurring-expense logic via cron-like triggers, and expose clean breakdowns with a new analytics view. Notifications will route through your current APNs/FCM setup with lightweight event-driven logic. All changes will ship with migration scripts, stay under the style guide, and validate against your live sign-in flow and DB constraints. I can start immediately. Thanks, Andrii.
$150 USD in 2 days
3.3
3.3

Ready for a game-changer? Let me introduce myself: Mahad Sheikh, a seasoned full-stack developer passionate about transforming ideas into digital solutions that solve real-world problems, and I'm ready to do the same for your expense app. With my diverse experience, including mobile app development and database management, combined with my adaptability - precisely what you need for your existing codebase – I assure you a smooth transition and impeccable execution. One of my core strengths lies in building clean, efficient systems that are designed for long-term success. Equipped with a wide range of technologies from PHP to React.js and Node.js, I can create powerful functionalities like monthly and per-category budgeting, spending limits, savings goals, and recurring-expense handling needed for your app. Additionally, my expertise in building reliable analytics layers will ensure that the insights drawn from each user's transaction history perfectly complement the existing dashboards. What sets me apart is not just my technical proficiency but an unwavering focus on delivering value beyond code. My approach centers on engaging closely with my clients on every project stage - from gaining clarity on requirements to delivering precise next-step recommendations.
$50 USD in 5 days
3.4
3.4

Your app already has the data models for users, expenses and categories, so the budget layer should slot in without reworking what's there. That's the right approach. I've got 10+ years in full-stack development and have taken over live mobile projects like this before, adding feature modules on top of existing schemas without breaking the current UX or sign-in flow. I'd build monthly and per-category budget tracking with spending limits first, then layer in savings goals and recurring expense handling. For notifications, I'd wire up configurable triggers for budget-limit events and financial milestones so users get alerted before they overspend, not after. I've shipped similar cross-platform work on React Native with Firebase, so both iOS and Android get covered in one pass. You'd get clean migration scripts for every schema change and a hand-off doc covering module structure, notification config and what to tackle next. No guesswork for whoever picks this up after the sprint. I can start this week. Want to do a quick call first so I can look at the current codebase and give you a realistic timeline before anything kicks off?
$150 USD in 7 days
3.4
3.4

Hi there, I think you’re trying to evolve an existing expense app into a practical personal-finance tool without disrupting the current iOS/Android experience. I can work directly within your existing codebase and extend the current user, expense and category models with monthly/category budgets, spending limits, savings goals and recurring expenses. I’ll build the budgeting logic into the existing architecture, then add clear insights such as category breakdowns, spending trends and remaining-budget views. I’ll also implement configurable notifications for approaching or exceeded limits and structure the analytics layer so these metrics can later power richer dashboards. Before changing the data model, I’ll review the current authentication, database schema, navigation and coding patterns to avoid unnecessary rewrites. Any migrations will be production-ready, and I’ll test the new flows across both platforms while checking performance and existing functionality for regressions. I think the key is extending what already works rather than creating a disconnected budgeting module. Looking forward to work with you. Thanks
$100 USD in 3 days
3.4
3.4

Hi, I am a mobile app developer with 8 years of experience in software development, with a strong background in full-stack mobile applications and existing codebase maintenance. I am familiar with iOS, Android, React Native, Flutter, JavaScript, TypeScript, REST APIs, database design, analytics, push notifications, and schema migrations. I can extend your current expense app with monthly and category budgets, spending limits, savings goals, recurring expenses, notifications, and transaction-based insights while keeping the existing authentication and data model intact. I will also make sure the new features integrate cleanly with the current UI and analytics layer without affecting performance. I'm an individual freelancer and can start right away and work in any time zone you prefer. Please contact me with the best time for you to have a quick chat. Looking forward to discussing more details. Thanks. Emile.
$250 USD in 7 days
3.1
3.1

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