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I’m launching a green-field application that must run seamlessly in the browser and as a native Android build. Your job is to take it from concept to deployment, delivering a slick, modern interface backed by a robust database and a secure email-and-password sign-in flow. Scope • Architecture & Stack: Propose the framework, cloud services, and tooling you feel best support a shared web/Android codebase. I’m open to progressive web app, React/[login to view URL] + Kotlin, Flutter, or any other well-reasoned approach that keeps maintenance straightforward. • UI/UX: Craft responsive screens that feel equally natural on desktop, tablet, and Android handsets, following today’s accessibility and material design guidelines. • Data Layer: Design and implement the database schema, API endpoints, and ORM logic for fast, scalable reads/writes. • Security: Implement salted hashing, transport-layer encryption, and session management to ensure the email/password authentication stays airtight. • Testing: Unit, integration, and basic UI tests are mandatory; automated CI pipelines are a plus. • Documentation: Inline code comments, a concise setup guide, and an end-user manual so future contributors can ramp up quickly. Deliverables 1. Source code repository with clean, modular commits 2. Build scripts / CI configuration 3. Deployed web app (staging) + signed Android APK or AAB 4. API & database ERD documentation 5. Test report with coverage metrics 6. README and user guide Acceptance Criteria • All primary workflows operate without error on Chrome, Firefox, and latest Android devices. • No critical or high-severity security findings in an OWASP scan. • Lighthouse score ≥ 90 for performance and accessibility. • Build and deploy steps reproducible from the README alone. If you can hit those marks and think ahead to possible iOS expansion down the road, I’d love to see your plan of attack, timeline, and any similar projects you’ve shipped.
Project ID: 40496745
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210 freelancers are bidding on average $529 USD for this job

For your web and Android app, I'd recommend Flutter Web + Flutter Android from a single codebase, backed by a Node.js/Express API and PostgreSQL — this keeps future iOS expansion straightforward with minimal extra effort. I'll cover your full scope: responsive UI following Material Design and accessibility guidelines, secure email/password auth with salted hashing and session management, well-structured database schema with ORM, unit/integration/UI test coverage, and CI/CD pipelines. Deliverables include source repo with clean commits, staging web deployment, signed APK/AAB, API + ERD documentation, test report, and a setup README. I take OWASP security seriously and aim for Lighthouse scores above 90. Happy to share similar projects I've shipped and propose a realistic milestone timeline after a quick discussion. Regards, Harsh Thoriya
$750 USD in 7 days
8.3
8.3

Hi, I can help you design and build a scalable cross-platform solution that works seamlessly on web and Android, with a strong focus on clean architecture, security, and maintainability. I have solid experience in full-stack development, backend API design, authentication systems, and building scalable applications with responsive UI across web and mobile environments. For this project, I will deliver: • Clean system architecture and recommended tech stack (web + Android strategy) • Secure email/password authentication with proper encryption and session management • RESTful APIs with scalable database design and ORM integration • Responsive UI aligned with modern accessibility and UX standards • Unit, integration, and basic UI testing with CI-ready structure • Deployment-ready web app + Android build (APK/AAB) • Clear documentation including setup guide and API/ERD documentation I focus on building production-ready systems that are easy to scale and extend for future iOS or additional platforms. I’d be happy to discuss the best technical approach and timeline based on your exact requirements. Looking forward to collaborating.
$250 USD in 3 days
7.2
7.2

Hello, I can help you take this application from architecture planning to full deployment with a scalable, secure, and maintainable cross-platform setup. What I’ll deliver: • Modern responsive UI/UX following Material Design and accessibility best practices • Secure email/password authentication with hashing, encrypted transport, and session management • Scalable API and database architecture • Clean modular codebase with documentation and reusable components • Unit, integration, and UI testing setup • Staging deployment and Android APK/AAB builds Security & Performance Focus: • OWASP-aligned development practices • HTTPS, secure tokens, rate limiting, and validation layers • Optimized frontend performance targeting Lighthouse 90+ • Clean API structure designed for future iOS expansion Deliverables Included: • Source code repository with structured commits • Build scripts and CI/CD configuration • API documentation and ERD diagrams • README, setup guide, and user documentation • Test coverage and deployment instructions I can also share similar full-stack web/mobile projects and discuss the best stack once the functional scope is finalized. Lets connect.. Shailesh
$653 USD in 16 days
7.7
7.7

Hello, Your project is a great fit for my experience in building full-stack web and mobile applications from the ground up. I have 8+ years of experience developing scalable applications using Flutter, React, Node.js, Laravel, PostgreSQL/MySQL, AWS, and Firebase. I can take your application from architecture planning to deployment while ensuring security, performance, and future scalability. Questions ========= Do you already have wireframes or should UI/UX be designed from scratch? What are the core workflows/features for the MVP? Will there be different user roles and permissions? Do you have a preferred cloud provider (AWS, Azure, Firebase)? Are there any third-party integrations planned? I’m available to start immediately and would be happy to discuss the project in detail and provide a technical roadmap before development begins. Best Regards,
$500 USD in 7 days
7.2
7.2

Hi, We can take this from architecture planning through deployment and would recommend Flutter + Firebase/Supabase for a shared web and Android codebase with a clear path to future iOS expansion. Our team would handle the complete stack: responsive UI/UX, secure authentication, database design, API architecture, testing, CI/CD setup, documentation, and deployment. We build with scalability in mind, using modular architecture, automated testing, and security best practices to meet requirements such as OWASP compliance, Lighthouse targets, and reproducible deployments. We'll provide a fully documented solution including source code, ERD documentation, API references, deployment guides, test reports, and staging/production builds. The focus is not only delivering the MVP but ensuring the codebase remains maintainable and ready for future growth. Regards Interconnect Team
$500 USD in 7 days
6.8
6.8

Hi, I am a software engineer. I can create a custom web app and android app for your project.
$250 USD in 7 days
6.6
6.6

Hi, I understand you are looking for a developer who can take a green field application from planning to deployment while ensuring it performs seamlessly across web browsers and Android devices. The focus is not only on building the application but also establishing a scalable architecture, secure authentication system, clean codebase, and a deployment process that can support future growth including potential iOS expansion. For this project, I would recommend Flutter for the frontend to maintain a single codebase across Android, web, and future iOS releases. On the backend, a modern stack such as Node.js with PostgreSQL or Supabase would provide strong scalability, secure authentication, and efficient data management while keeping maintenance straightforward. The architecture will be designed with modular components, API separation, and performance optimization from the start. Security and quality will be treated as core requirements rather than afterthoughts. I will implement secure password hashing, encrypted communication, proper session management, role based access where required, automated testing, CICD pipelines, and documentation covering setup, deployment, API structure, database design, and user workflows. Kindly review my portfolios, https://www.freelancer.pk/u/zainalitariq245 Looking forward to discussing your project further. Best Regards, Zain A.
$300 USD in 15 days
6.4
6.4

Hello, I hope you are doing well. I understand that you are looking to build a 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.
$250 USD in 5 days
7.0
7.0

Hey there, regarding your green-field application project, I see a critical need to ensure both browser and Android versions perform harmoniously. I specialize in delivering applications that merge a sleek UI with robust backend security. By leveraging tools like React with Kotlin or opting for Flutter, I can ensure codebase uniformity and seamless maintenance across platforms. I've previously transformed a complex web app into a native Android experience, boosting its user engagement by 40% through high optimization. I'll include 30 days of free post-deployment bug-fixing to ensure smooth operation. Have you considered any specific cloud services for hosting, or are you open to suggestions? Let's discuss your vision further.
$250 USD in 7 days
6.2
6.2

Hello, Yes, would a Progressive Web App suit your needs? Do you plan on expanding this app to iOS in the future? Excited to build your seamless app! To create a cohesive experience, I'll unify the codebase for both web and Android, ensuring a slick UI that works flawlessly across all devices. One challenge might be maintaining top-notch security across platforms, and I'll ensure airtight protection without compromising usability. I'll happily share my previous work in chat. Let's discuss the details together in a chat or call to align on the timeline and costs. Looking forward to crafting something amazing with you! Feel free to message me to kick things off effortlessly.
$250 USD in 4 days
6.0
6.0

Hi, your plan for a unified web and Android build stood out, especially your requirement for reproducible deployments and a 90+ Lighthouse score. I’ve delivered cross‑platform systems where I shipped both a browser app and a native Android build from a shared codebase, achieving stable authentication and clean CI pipelines. I see the real challenge as keeping the platform flexible enough for Android today while leaving room for iOS later. That means selecting a framework that avoids fragmented logic, ensuring your API contract, schema design, and auth flow remain consistent across both environments. I’ll define the architecture, implement responsive UI aligned with Material guidelines, build a scalable schema with fast endpoints, and integrate secure email/password authentication with robust session handling. I’ll also configure modular CI, write test coverage, and deliver the staging deployment plus a signed Android artifact. Before I finalize the timeline, I need clarity on your preferred cloud provider, any existing branding, and whether you expect offline capability. I’ll deliver a full plan and begin immediately. Thanks, John allen.
$500 USD in 7 days
5.6
5.6

As an experienced Full-Stack Developer with a sharp focus on your specific requirements, I strongly believe that my skills in Android and Flutter programming aligns well with this project. I have successfully built innovative cross-platform apps using these frameworks before, ensuring both web and mobile ends offer the same functionality, performance and user experience. To further streamline maintenance and scalability, I am also flexible to consider other architectures or tech stacks that best suit your unique project needs. Moreover, my proficiency in different parts of software development, including but not limited to designing databases, creating secure authentication systems, implementing Unit, Integration & UI tests, setting up automated CI pipelines and maintaining clean code repositories would significantly assist me in delivering comprehensively on your needs for this green-field application. My track-record speaks for itself: from the launch of production-grade apps to creating AI-powered solutions for a variety of platforms. I understand what it takes to overcome the challenges that emerge during a project lifecycle while holding fast to deadlines and budgetary constraints. Clients choose me time and again because they appreciate not only my technical superiority but also my efficient communication style which includes daily updates and realistic timelines. Trust me to convert your vision into reality; let's build something excellent together!
$500 USD in 7 days
5.5
5.5

Hello, I’d be excited to take this project from architecture through deployment and would recommend a Flutter-based approach for the shared codebase. This provides a single codebase for Android today while keeping the door open for future iOS expansion with minimal additional effort. My proposed stack: • Flutter for Web and Android • Node.js/NestJS or Laravel API backend • PostgreSQL for a scalable relational database • JWT-based authentication with secure session handling • BCrypt/Argon2 password hashing • Docker, GitHub Actions, and automated CI/CD pipelines • AWS, DigitalOcean, or Google Cloud deployment Deliverables will include: • Responsive UI optimized for desktop, tablet, and Android devices • Secure email/password authentication flow • Database design with ERD documentation • REST APIs with clean architecture and ORM implementation • Unit, integration, and UI testing with coverage reports • CI/CD configuration and deployment scripts • Staging deployment and Android APK/AAB delivery • Complete technical documentation and user guide I’m available to start immediately and can provide a detailed milestone plan and timeline once the core workflows and business requirements are reviewed. Looking forward to discussing the project further.
$500 USD in 7 days
5.2
5.2

Hello, Your project requires careful planning from day one, covering architecture, user experience, security, database design, testing, deployment, and future expansion. I have experience delivering complete web and mobile applications from concept through production, with a strong focus on performance, maintainability, and security. I am confident we can create a solution that works smoothly across browsers and Android devices while keeping future iPhone support in mind. My approach focuses on clear project phases, thorough testing, and documentation that makes future updates straightforward. I would love to schedule a brief discussion to review your goals and expected workflows. From there, I can recommend the most suitable approach, timeline, and delivery plan. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
$500 USD in 7 days
5.4
5.4

With vast experience and expertise in web and Android app development, I am confident that I can deliver the best-customized solution for your project. I am well-versed in PHP, Node.js, Vue.js, and C# programming and this enables me to build robust and scalable applications that operate smoothly on diverse platforms. Complementing this is my solid knowledge in native Android languages like Java and JavaScript, which can ensure a seamless operation on latest Android devices. Additionally, I understand the importance of data security in this digital age. My proficiency in implementing measures like salted hashing, transport-layer encryption, and session management will guarantee an airtight authentication system. With regard to testing, I consider unit integration, basic UI tests mandatory which will provide good coverage metrics; automating CI pipelines would be an added advantage in ensuring efficient continuous integration. To sum up, hiring me would not just mean getting the job done but receiving quality workenabling future contributors to ramp up swiftly using my detailed inline comments and end-user manual documentation.
$500 USD in 7 days
5.0
5.0

Hello Sir, I am interested and ready to work on your Custom Web & Android App Development. I have similar work experience. I will develop as you want. Please open chat for detailed discussion so we can move forward. we have expertise in software development, website, and app development, AI Automation, chatbots. We have 9+ years of experience in software, web, and app development. We have done many websites and apps before. We are experts in native app development, hybrid (Cross-platform) app development, web app and website development. We will provide complete solution design, development, testing, and support/maintenance. ?️Technology expertise in flutter and dart, java, Kotlin, PHP, XCode, swift UI, react native, Unity, C#, C/C++ HTML, java, CSS, PHP, Laravel, CI, flutter, Python, Node.js,React.js AL/ML WordPress, WooCommerce for design: Figma, adobe photoshop, adobe illustrator. ➡️We will provide you ✨Budget Friendly service ✨Quality service ✨Support/maintenance ✨Timely meetings and updates Portfolio : https://www.freelancer.in/u/Zefinit Please open chat so we can start now. Thank you Khushboo
$500 USD in 7 days
5.1
5.1

For a shared web + Android codebase that one person can maintain, Flutter is usually the cleaner call — one codebase, real native Android output, and the web build is good enough for the browser side. A PWA is cheaper if "native Android" really means installable-and-offline rather than truly native, but you lose platform features later. The acceptance criteria (Lighthouse 90+, OWASP-clean, CI, tests, signed AAB, docs) are tight for the budget once you add the auth and schema work, so the practical move is locking down the v1 feature list early and keeping anything non-core out of the first build. What's the actual core workflow the app needs to do on day one?
$250 USD in 5 days
4.7
4.7

Most projects like this struggle not from technology choices but from fragmentation: separate web and Android codepaths, unclear auth boundaries, and missing CI that make deploys and security audits painful. I recommend an incremental MVP built in short sprints: wireframes → single shared UI implementation → hardened API → tests → staging + signed AAB. Prioritize a polished Material-based UX, strict auth (hashed passwords + refresh tokens), automated OWASP checks, and Lighthouse tuning before launch. For a single shared codebase I’d use Flutter (web + Android) with a FastAPI backend, PostgreSQL (RDS), Dockerized services, and GitHub Actions for CI/CD. Host static web build on S3/CloudFront, backend on Fargate/ECS, and produce an AAB via the CI pipeline. Use Argon2/bcrypt for password hashing, TLS everywhere, JWT with refresh rotation, and rate-limiting. I’ll keep the repo modular (monorepo), document ERD and API, include unit/integration/UI tests, and leave API versioning and infra-as-code hooks so moving to iOS or scaling is straightforward. I can draft a 2-week sprint plan and milestone timeline (typical MVP → staging + signed AAB in ~6–8 weeks). I recently built ReThinkology (React Native + Django + PostgreSQL), shipping mobile builds, Dockerized backend, admin tooling and CI — similar delivery pattern and security posture. Do you already have UI designs/brand guidelines or should I include full UI/UX in the initial scope?
$500 USD in 7 days
4.8
4.8

Hello, I can create/modify the app/web as you wish. I have 6.5+ years of experience in this field. Let's connect and discuss more about your requirements. Thank you.
$650 USD in 8 days
5.0
5.0

Hi, For a project like this, I would recommend Flutter from day one. It gives you: one codebase for web and Android lower maintenance cost faster development easier future iOS expansion I can help with: architecture and database design secure authentication responsive UI/UX API development testing and CI/CD deployment and documentation I consistently focus on: clean scalable architecture OWASP security best practices high Lighthouse scores maintainable code production-ready delivery I've built similar platforms involving authentication, dashboards, APIs, mobile apps, and cloud deployments, and I use AI-assisted workflows to deliver faster while maintaining quality
$750 USD in 21 days
5.2
5.2

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