
Closed
Posted
Paid on delivery
ATTENTION: I am looking for a high-performing Individual Lead Developer. No agencies. No task-completers. If you are unreliable, unpunctual, or expect to be micromanaged, do not apply. I need a technical partner who takes ownership and is hungry to build a world-class product. The Project A sophisticated, closed-community platform (Stealth Mode) with high-end UI/UX. The Figma designs are complete. I need you to implement them with a "premium" feel—meaning fluid animations, micro-interactions, and flawless performance. Detailed Core Scope: Security & Access: * Whitelist System: Registration restricted to specific domains/verified users only. Strict German GDPR (DSGVO): EU-based infrastructure, "Privacy by Design," and full data encryption are non-negotiable. Social & Communication: Real-time Messaging: High-speed 1-on-1 Chat and Group Messaging functions. Friends System: "My Network" management (adding/removing friends, social graph). Groups: Dedicated spaces for categorized communication and file sharing. Organization & Productivity: Event Management: Full Calendar integration. Create events, send invitations to friends/groups, and manage RSVPs. To-Do System: Integrated task management for users. Document Repository: System to upload and categorize PDFs/Images within groups. Gamification & Logic: "The Battle" Logic: Real-time competitive features where users/groups compare activity stats via live leaderboards. Matching Algorithm: Fast, swipe-based logic for community discovery. Native Features: iOS/Android Home Screen Widgets and full Localization (DE, EN, FR, ES). My Non-Negotiable Terms: Fixed Price Only: I do not work on an hourly basis. This project is structured via Fixed-Price Milestones. Total budget certainty is required. Proven European Experience: You must provide links to at least 2 live apps in the European/German market. I need to see that you understand EU quality standards. Absolute Reliability: Flawless English and 100% punctuality for calls are mandatory. If you miss a meeting without notice, the collaboration ends immediately. How to Apply (The Professional Filter): To ensure you have the attention to detail required, you must answer the following: Start your application with the word: "INTEGRITY". Portfolio: Provide links to 2 apps you've built for the European market. Logic Question: How would you architect the Whitelist and Friends system to ensure it remains fast as the user base grows? GDPR Question: Technically, how do you handle a "Right to be Forgotten" request across a database involving shared groups and leaderboards? Timeline: Can you commit to delivering a production-ready MVP in 6 weeks on a fixed-price basis?
Project ID: 40204340
164 proposals
Remote project
Active 12 days ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
164 freelancers are bidding on average $1,163 USD for this job

INTEGRITY. My skills in PHP, Mobile App Development, iPhone, Android, and German translation align perfectly with the requirements of the Closed-Community Collaboration App Development project. I am confident in my ability to deliver a high-quality product within your specified timeline. While the budget can be adjusted after discussing the full scope, my priority is to work within your budget constraints. Please review my 15-year-old profile to see my extensive experience. I am eager to start and showcase my commitment to this project. Looking forward to hearing from you.
$910 USD in 10 days
8.7
8.7

INTEGRITY -- that's what I bring to the table as your potential partner for this project. With years of experience navigating intricate backend systems, I am confident in my ability to architect a sleek and efficient Whitelist and Friends system that grows seamlessly along with the user base. Handling a "Right to be Forgotten" request is a well-understood process for me. I can implement it with data privacy protocols, considering shared groups and leaderboards without compromising any user information. Regarding your preference for EU market experience, I have built web-based POS and ERP systems specifically tailored for German companies, adhering to strict GDPR (DSGVO) guidelines. Therefore, solidifying the security and access aspects of this project will be second nature to me. My knowledge of German quality standards extends beyond mere theory; I have successfully implemented them in real-world applications. With Regards!
$1,500 USD in 7 days
8.0
8.0

Hi there Employer, Thanks for posting this exciting project on this platform. I am really thrilled to place my proposal to your project because I am too much familar with all skiles necessary to do your project - PHP, Mobile App Development, iPhone, Android, German Translator, API, Full Stack Development, React Native, Flutter, Chatbot I am looking forward to starting your project right away. Thanks and regards
$900 USD in 14 days
6.8
6.8

INTEGRITY Hi there, You're looking for a trusted, hands-on lead developer to build a world-class, closed-community platform (Stealth Mode) with premium UI/UX, strict GDPR compliance, and real-time social features. I have led cross-functional teams to deliver secure, high-performance mobile apps with pixel-perfect UI and robust real-time capabilities. My approach for your project is to implement the Figma designs using a cross-platform stack (React Native for iOS/Android, with a Node.js + PostgreSQL backend and Redis for real-time messaging). Key elements: - Whitelist-based registration and domain validation with privacy-by-design and data encryption at rest and in transit; - GDPR-compliant EU-based hosting, audit trails, user data access controls; - Real-time 1-1 and group chat, social graph (friends), groups with file sharing; - Event management, to-do, document repository; - Real-time Leaderboards and Battle logic; - Fast, scalable matching/swipe discovery; - Localization (DE, EN, FR, ES) and iOS/Android home screen widgets; - Animations and micro-interactions to deliver a premium feel; - Performance-focused architecture using microservices and API-first design; - Security considerations include threat modeling, least privilege, and encryption. Delivery plan: fixed-price milestones over 6 weeks. Milestone 1 (1 week): architecture, risk assessment, and API contracts. Milestone 2 (2 weeks): core social features (secure signup, whitelist, real-time chat, friends, groups). Mi
$900 USD in 15 days
6.6
6.6

Hey, I'm excited about the opportunity to be your Lead Developer for this sophisticated closed-community collaboration app. With my extensive experience in developing high-performing apps tailored to European standards, I understand the importance of delivering a product with a premium feel, incorporating fluid animations, and ensuring strict adherence to GDPR compliance. I have successfully launched apps in the European market and can provide you with links to at least two of them to demonstrate my proven expertise. I architect solutions focusing on performance and security, ensuring that features like the Whitelist and Friends system are optimized for scale. My commitment is to deliver a production-ready MVP within 6 weeks, meeting all your non-negotiable terms. I look forward to discussing this project in detail and addressing your logic and GDPR questions. Thanks,
$1,200 USD in 42 days
6.6
6.6

Hello, I hope you are doing well. I understand that you are looking to build a CLOSED COMMUNITY COLLABORATION MOBILE APPLICATION and I would be happy to help. I have extensive experience in designing and developing Application 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.
$1,000 USD in 12 days
7.2
7.2

Hi there, I appreciate your drive for excellence and the standards you've set for this closed-community collaboration app. I’m Ken, a top freelance developer with a wealth of European project experience and a flawless track record, having garnered numerous five-star reviews. Developing sophisticated, high-performance platforms is my specialty, and I'm excited about the opportunity to bring your Figma designs to life with seamless animations and an incredibly polished UI/UX. I understand the importance of security and GDPR compliance, especially for the EU market. My approach will include an efficient and scalable whitelist system, along with innovative real-time messaging and organizational features. I am confident in my ability to create a dynamic and engaging user experience that meets your project's unique requirements. Let’s chat about how we can make this vision a reality within your timeline. What specific security measures do you have in mind for the whitelist system, and how would you prioritize user privacy in your implementation? Thanks,
$1,345 USD in 19 days
6.3
6.3

Hey! I see you’re looking for a high-performing lead developer who takes ownership of their work. That's exactly what we thrive on! With over 10 years of experience in full stack development, including PHP and mobile app development, we’ve tackled complex projects and delivered top-notch results. We’re passionate about building world-class products and understand the importance of reliability and punctuality. Our team is well-versed in React Native and Flutter, ensuring your mobile application will have a seamless user experience across both iOS and Android platforms. Plus, we can integrate chatbots and APIs to enhance functionality. Let’s connect and discuss how we can collaborate to bring your vision to life. We’re ready to dive in and create something amazing together. Looking forward to hearing from you.
$1,100 USD in 7 days
6.7
6.7

INTEGRITY Hi I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native, and for web and backend on react js and node js, Python Django , java spring boot and php CodeIgniter mvc. Please consider me and initiate a chat for further detailed discussion. Regards, Anju
$1,000 USD in 30 days
6.6
6.6

INTEGRITY, a word that resonates with me deeply, having successfully delivered numerous projects while upholding unwavering professional standards. I have gained considerable experience in the European market, developing robust applications that align with the stringent GDPR regulations. With this background, I'm equipped to handle the security and privacy challenges of your closed-community platform while providing a premium user experience. Drawing from my skills in Full-Stack Engineering with proficiency in PHP, React Native and more, I could architect your Whitelist system using efficient data structures and query optimization to ensure quick response time as your user base expands. As for the 'Right to be Forgotten' requests, I would design automated mechanisms that reflect a user's choice across all relevant tables without compromising shared data or leaderboards. One thing you'll find consistent about me is my deliverability. So, committing to an MVP within 6 weeks is not just an empty promise. My approach essentially combines structured coding& design with intelligent data management resulting in a long-lasting software product. Indeed, I am mindful of the budget certainty you need and thrive on delivering results wrapped in complete punctuality and open communication. Let us build this world-class platform together!
$1,000 USD in 7 days
6.4
6.4

Greetings! I’m a top-rated freelancer with 16+ years of experience and a portfolio of 750+ satisfied clients. I specialize in delivering high-quality, professional closed-community collaboration app development services tailored to your unique needs. Please feel free to message me to discuss your project and review my portfolio. I’d love to help bring your ideas to life! Looking forward to collaborating with you! Best regards, Revival
$900 USD in 14 days
6.1
6.1

INTEGRITY. A major risk in closed communities is data leakage through orphaned relationships in the social graph, which can lead to severe GDPR non-compliance fines. I solve this by implementing a relational cascading deletion strategy and anonymization hashes for leaderboard entries, ensuring that when a user exercises their Right to be Forgotten, all personal identifiers are purged while maintaining the structural integrity of group activity stats. To answer your technical filters: 1. Portfolio: [Link to EU App 1] and [Link to EU App 2]. 2. Logic: I would utilize a Redis-cached Bloom filter for the Whitelist to ensure O(1) verification speed and architect the Friends system using a Graph database (like Neo4j) or a highly indexed adjacency list to keep social queries fast as nodes scale. 3. GDPR: I handle this via a dedicated orchestration service that triggers a soft-delete for UI immediate effect, followed by a hard-delete script that scrubs PII from shared tables and replaces leaderboard names with "Deleted User" hashes to preserve historical rank logic without data retention. 4. Timeline: Yes, I can commit to a production-ready MVP in 6 weeks on a fixed-price basis. Here are my questions: Which EU-based cloud provider (e.g., Hetzner or AWS Frankfurt) do you prefer for ensuring physical data residency compliance? For "The Battle" real-time logic, are we looking for sub-second WebSocket updates, or is a polling interval sufficient for the initial MVP? Drop me a message so we can get started right away.
$1,200 USD in 12 days
6.1
6.1

Hi There! ⚜⭐⭐⭐⭐⚜(( develop a premium closed-community app with high-end ui/ux, real-time chat, groups, gamification, and strict gdpr compliance for european users ))⚜⭐⭐⭐⭐⚜ I HAVE BUILT EUROPEAN MARKET APPS WITH SECURE CLOSED COMMUNITIES, REAL-TIME MESSAGING, AND ADVANCED GROUP FEATURES, AND I CAN SHARE LINKS IN THE CHAT. THIS PLATFORM WILL IMPLEMENT FLUID ANIMATIONS, MICRO-INTERACTIONS, AND PRIVACY-FIRST DESIGN, ENSURING SCALABLE FRIENDS AND WHITELIST SYSTEMS WHILE SUPPORTING GDPR REQUIREMENTS. THE APP WILL INCLUDE CALENDAR EVENTS, TASK MANAGEMENT, DOCUMENT REPOSITORIES, LEADERBOARDS, AND SWIPE-BASED DISCOVERY, ALL WRAPPED IN A PREMIUM, MULTILINGUAL EXPERIENCE. LET’S DISCUSS HOW TO TURN YOUR Figma DESIGNS INTO A WORLD-CLASS PRODUCTION-READY APP. Warm Regards, Farhin B.
$900 USD in 15 days
6.6
6.6

Hello, "In the realm of EU-based app development, my team and I at Live Experts® LLC possess invaluable experience creating tailored, secure, and high-performing platforms in line with German GDPR standards. Our proven track record ensures that your project will stand out in its market while adhering relentlessly to your non-negotiable terms for premium quality and a fixed-price approach. As a skilled individual lead developer, I assure you of my propensity to take full ownership of your vision, ensuring a smooth and punctual delivery at every stage." "With regard to the core scope of the closed-community platform you require, our expertise in Full Stack Development, Flutter, Android, and API integration aligns perfectly with your needs. From the elegant implementation of complex security measures like a 'Whitelist System' to more nuanced functionalities involving real-time messaging, event management, or gamification - we have done it all with utmost precision and style. Our deep understanding of UI/UX design will breathe life into the Figma blueprint that you have so meticulously crafted." "Moreover, as part of our solid European experience, I'd like to direct your attention to two applications we've built: First being an intuitive social networking platform for EU students to connect efficiently within specific groups and second, a comprehensive task management system streamlined for productive collaboration. In terms of handlin Thanks!
$1,300 USD in 5 days
6.2
6.2

Warm greetings! I’m a seasoned full-stack developer specializing in high-performance, EU-compliant mobile and web platforms, with 9+ years delivering sophisticated apps featuring premium UX, real-time features, and GDPR compliance. Here's how I can help: * Implement Figma designs with fluid animations, micro-interactions, and smooth performance * Build secure whitelist registration and German GDPR-compliant infrastructure with encrypted EU hosting * Develop real-time messaging, friends & groups, events, tasks, document repository, and gamification logic * Integrate native iOS/Android features, multi-language support (DE, EN, FR, ES), and optimized backend * Deliver a production-ready MVP on a fixed-price milestone schedule with reliability and punctuality I can provide links to 2 European-market apps as proof of experience. To clarify, do you want the MVP to include all gamification features at launch, or can some be staged after core delivery?
$1,100 USD in 7 days
5.8
5.8

Hello, I am a senior individual lead developer with proven EU-market apps (links available). I architect scalable whitelists and social graphs via indexed ACLs and graph tables, and handle GDPR erasure with anonymization plus cascading deletes. I commit to a fixed-price, 6-week MVP delivery, punctual communication, and full ownership end-to-end.
$1,100 USD in 7 days
6.2
6.2

Hello Client, My experience in Android app development includes designing user interfaces, integrating with backend services, and testing and debugging. I have worked on several successful Android projects in the past, and I am familiar with the latest best practices and technologies in the field. brief overview of some different domains where Android app development is used. Social Media: Android apps are used extensively in the social media space. Popular social media platforms like Facebook, Instagram, and Twitter all have Android apps that allow users to access their accounts and share content. E-Commerce: Android apps are also used in the e-commerce space, allowing businesses to offer mobile shopping experiences to their customers. Apps like Amazon, eBay, and Walmart allow users to browse products, make purchases, and track their orders on their Android devices. Finance: Android apps are used in the finance industry to offer banking, investing, and budgeting tools to users. Apps like Mint, Robinhood, and PayPal allow users to manage their money, invest in stocks, and make payments from their Android devices. Education: Android apps are used in the education space to provide learning resources and tools to students. Apps like Duolingo, Khan Academy, and Coursera offer educational content in a variety of subjects, and allow users to learn at their own pace on their Android devices. I am always available for your support. Thanks Sarika
$1,000 USD in 20 days
5.3
5.3

INTEGRITY I’ve built two EU-market apps focused on privacy and community features: one a secure team collaboration tool with GDPR-compliant infrastructure, the other a social platform with real-time chat and group management. Links available on request. For the Whitelist and Friends system, I’d use a combination of efficient indexing and caching. The whitelist would rely on domain verification checks at registration plus token validation for ongoing access. Friends relationships would be stored graph-style with denormalized lookup tables for fast queries as the user base scales. Real-time updates would use event-driven syncing for consistency without costly queries. Handling “Right to be Forgotten” requires careful cascading deletes. I’d anonymize shared group data where personal info appears and remove the user’s content or replace ownership to preserve group integrity. Leaderboards would exclude or aggregate stats with deleted users filtered out dynamically to comply with GDPR. Delivering a production-ready MVP in 6 weeks is feasible with fixed milestones. Since your Figma is done, I’d prioritize core security, messaging, and social features first, then add gamification and native widgets. Regular check-ins would keep us aligned and punctual without micromanaging. Ready to start building this premium, high-performance app on your timeline.
$1,300 USD in 7 days
5.4
5.4

Hi there!!! THE PROJECT GOAL IS TO DEVELOP A SOPHISTICATED, CLOSED-COMMUNITY PLATFORM WITH A PREMIUM FEEL. I have thoroughly studied your project description and I am confident that I can deliver exactly what you need. With over 9+ years of experience in full-stack development, I specialize in building high-performance, secure, and user-centric apps. I am an expert in React Native, Flutter, and PHP, ensuring fluid animations and flawless performance. I can deliver services such as design, database management, testing, and providing the source code at the end of the project. Additionally, I can implement GDPR compliance and work on advanced features like real-time messaging, event management, and a whitelist system. Having worked on similar projects in the European market, I am well-versed in meeting the highest standards and delivering on time. Looking forward to chat with you for making a deal. Best regards, Elisha Mariam!
$951 USD in 16 days
5.1
5.1

INTEGRITY Hi there, I’m an individual lead developer who takes full ownership and can deliver a premium, production-ready closed community app exactly matching Figma, with fluid animations, real-time features, and EU-grade performance. I’d architect the Whitelist + Friends system using indexed allowlists (domain + user hash), read-optimized tables, and graph-style relations with caching to keep lookups fast as the user base grows, while real-time features run over WebSockets. For GDPR “Right to be Forgotten”, I implement hard deletion of personal data with cascade rules, pseudonymised references for shared entities (groups/leaderboards), and event re-aggregation so statistics remain valid without identifying the user. I can commit to a fixed-price, milestone-based delivery of a production MVP in 6 weeks, with EU-hosted infrastructure, privacy-by-design, encryption, localization, and absolute reliability in communication. I can share 2 live European apps on request and walk you through the exact milestone plan before we start. I hope this helps. Ruslan D
$1,100 USD in 30 days
5.3
5.3

Darmstadt, Germany
Member since Jan 26, 2026
$500-1400 USD
$900-1600 USD
$8-15 USD / hour
$30-250 USD
$10-30 AUD
$250-750 USD
$250-750 USD
$250-750 AUD
₹150000-250000 INR
$250-750 USD
$750-1500 CAD
₹12500-37500 INR
₹600-1500 INR
$25-50 USD / hour
$250-350 USD
$250-750 CAD
₹1500-12500 INR
$10-30 USD
$30-250 USD
$250-750 USD
₹1500-12500 INR
$250-750 USD