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System Requirements
System Requirements Document (SRD)
Project: HeartLink — Matchmaking Application
Version: 1.0 Date: 2026-02-27 Status: Draft
1. Introduction
HeartLink is a matchmaking web and mobile application designed to connect individuals seeking romantic relationships. The platform enables users to create rich profiles with photos, discover potential matches, and engage in meaningful conversations. This document outlines the functional and non-functional requirements, design concepts, tech stack, and assumptions governing the development of HeartLink.
2. System Overview
HeartLink provides a user-friendly matchmaking experience where individuals can:
- Register and build detailed personal profiles with photo galleries
- Browse and discover other users based on preferences
- Express interest through likes, swipes, or connection requests
- Chat with mutual matches in real-time
- Manage their account, privacy, and notification settings
The system consists of a React web frontend, a React Native mobile app, a FastAPI backend, and a MySQL relational database, with media storage for user-uploaded photos.
3. Functional Requirements
User Stories
Guest (Unauthenticated User)
- As a Guest, I should be able to view the landing/home page and understand what the app offers
- As a Guest, I should be able to register for a new account using email or social login
- As a Guest, I should be able to log in to my existing account
- As a Guest, I should be able to reset my password via email
User (Authenticated Member)
- As a User, I should be able to create and edit my profile with personal details (name, age, bio, interests)
- As a User, I should be able to upload a profile photo and add multiple photos to my gallery
- As a User, I should be able to set my match preferences (age range, location, interests)
- As a User, I should be able to browse/discover other user profiles with photos
- As a User, I should be able to swipe or like/dislike profiles to express interest
- As a User, I should be able to see a list of my mutual matches (when both users liked each other)
- As a User, I should be able to send and receive messages with my matches in real-time chat
- As a User, I should be able to view a match's full photo gallery
- As a User, I should be able to report or block another user
- As a User, I should be able to manage my notification preferences
- As a User, I should be able to delete my account and all associated data
Admin
- As an Admin, I should be able to view and manage all registered user accounts
- As an Admin, I should be able to review and action user reports (ban, warn, dismiss)
- As an Admin, I should be able to remove inappropriate profile photos or content
- As an Admin, I should be able to view platform analytics (registrations, active users, matches made)
- As an Admin, I should be able to send platform-wide announcements or notifications
4. User Personas
| Persona | Description |
|---|---|
| Guest | An unauthenticated visitor exploring the platform before signing up. They can view marketing content but cannot access profiles or matching features. |
| User | A registered and authenticated member actively using the platform to find matches. They can manage their profile, browse others, match, and chat. |
| Admin | A platform operator with elevated privileges to moderate content, manage users, review reports, and monitor platform health. |
5. Visuals, Colors and Theme
Color Palette
| Role | Color | Hex |
|---|---|---|
| Primary | Warm Rose | #E8556D |
| Secondary | Soft Blush | #F9A8B8 |
| Accent | Deep Crimson | #C0233A |
| Background (Light) | Ivory White | #FFF8F9 |
| Background (Dark) | Midnight Plum | #1A0A12 |
| Text Primary | Charcoal | #2D2D2D |
| Text Secondary | Muted Mauve | #9E7B85 |
| Success | Sage Green | #6DBF8A |
| Error | Coral Red | #E8556D |
Typography
- Headings:
Playfair Display— elegant, romantic serif - Body:
Inter— clean, modern, highly readable - Accent/Labels:
Lato— light weight for captions and tags
Theme
Romantic yet modern — a warm palette of rose and blush tones against clean ivory whites. Dark mode uses deep plum/midnight backgrounds to create an intimate, luxurious feel. Card-based UI with soft drop shadows, rounded corners (border-radius: 20px), and subtle gradient overlays on photo cards.
6. Signature Design Concept ✨
"The Constellation Gallery" — Living Match Discovery Experience
The homepage is not a page — it is a night sky.
When a user first lands on HeartLink, they are greeted by a deep midnight-to-plum gradient sky that slowly breathes — subtly pulsing lighter and darker, as if alive. Scattered across this sky are floating circular profile photo bubbles of varying sizes, each glowing softly with a warm rose halo.
Here is exactly what the user sees and experiences:
- Hero Section: A full-screen canvas where dozens of soft, blurred profile photo circles drift slowly — like stars floating in a gentle cosmic wind. Each circle subtly pulses with a warm rose/blush glow, and hovering over one causes it to expand slightly, revealing a name and age with a dreamy fade-in.
- Constellation Lines: As the user moves their cursor across the screen, thin golden thread lines draw themselves between nearby profile bubbles — forming constellations — visualizing the idea that connections are written in the stars.
- CTA Emergence: The headline "Your Story Starts in the Stars" materializes letter-by-letter in elegant Playfair Display, glowing gently in warm ivory. Below it, a single rose-colored "Find Your Match" button pulses with a heartbeat animation — a soft radial glow expanding outward and fading, on a 1.5-second loop.
- Scroll Transition: As the user scrolls down, the star-sky tilts away in a parallax perspective shift, and the feature sections emerge from below — each card sliding up from the darkness, snapping into place with a soft spring animation.
- Profile Cards: On the discovery/browse page, profiles are displayed as stacked polaroid-style photo cards. The top card is fully visible; cards beneath are peeking at offset angles. The user swipes or drags the top card — it arcs across the screen with a satisfying elastic snap, leaving a trail of rose or grey particles (like/dislike). The next card scales up smoothly from below.
- Match Moment: When two users match, the screen briefly erupts in a burst of floating heart confetti rendered in rose, blush, and gold — cascading down over a modal that shows both profile photos side by side with the constellation line connecting them, pulsing gold.
- Micro-interactions: Every tap, hover, and swipe has tactile feedback — buttons depress slightly (
scale: 0.97), photo cards cast dynamic drop shadows that shift with drag direction, and unread message badges bounce with a gentle heartbeat animation.
This design turns the matchmaking experience into something cinematic — it doesn't feel like an app, it feels like fate.
7. Non-Functional Requirements
| ID | Requirement | Detail |
|---|---|---|
| NFR-01 | Performance | Page load time < 2 seconds; API response < 300ms for 95th percentile |
| NFR-02 | Scalability | System must support up to 100,000 concurrent users |
| NFR-03 | Availability | 99.9% uptime SLA; zero-downtime deployments |
| NFR-04 | Security | All data in transit encrypted via TLS 1.3; passwords hashed with bcrypt |
| NFR-05 | Privacy | GDPR-compliant; users can export and delete all personal data |
| NFR-06 | Media Storage | Profile photos optimized and served via CDN; max upload size 10MB per photo |
| NFR-07 | Responsiveness | Full mobile-responsive web UI; native mobile app for iOS and Android |
| NFR-08 | Moderation | Automated photo screening for inappropriate content before display |
| NFR-09 | Accessibility | WCAG 2.1 AA compliance across all UI components |
| NFR-10 | Localization | Support for multiple languages (English first; extensible i18n architecture) |
8. Tech Stack
Frontend
| Layer | Technology | Reason |
|---|---|---|
| Web App | React (with Vite) | Fast, component-based SPA for the web platform |
| Mobile App | React Native | Cross-platform iOS & Android from shared codebase |
| Styling | Tailwind CSS | Utility-first rapid UI development |
| Animation | Framer Motion | Smooth, physics-based animations for swipe cards, transitions |
| State | Zustand | Lightweight global state management |
Backend
| Layer | Technology | Reason |
|---|---|---|
| API Framework | FastAPI (Python) | High-performance async REST API |
| Auth | JWT + OAuth2 | Secure token-based authentication and social login |
| Real-time Chat | WebSockets (FastAPI) | Low-latency real-time messaging |
| Task Queue | Celery + Redis | Async tasks: email, notifications, photo processing |
Database
| Type | Technology | Reason |
|---|---|---|
| Primary RDBMS | MySQL (with Alembic) | User profiles, matches, messages, reports |
| Cache | Redis | Session caching, real-time presence, rate limiting |
Media & Storage
| Layer | Technology | Reason |
|---|---|---|
| Object Storage | AWS S3 / MinIO (local) | Photo and media file storage |
| CDN | CloudFront / Nginx | Fast global delivery of profile images |
Infrastructure
| Layer | Technology | Reason |
|---|---|---|
| Containerization | Docker + Docker Compose | Local development orchestration |
| Production | Kubernetes | Scalable server-side container orchestration |
| CI/CD | GitHub Actions | Automated testing and deployment pipelines |
9. Assumptions and Constraints
Assumptions
- Users are adults (18+); age verification will be enforced at registration
- Initial launch targets English-speaking markets; i18n will be architected from day one but not fully implemented in v1
- Photo moderation in v1 will use a third-party API (e.g., AWS Rekognition or Google Vision); custom AI moderation is a v2 feature
- Real-time chat is scoped to text messages in v1; media sharing in chat is a v2 feature
- Social login will support Google and Apple in v1
Constraints
- Mobile app must support iOS 15+ and Android 10+
- Web app must support the last 2 major versions of Chrome, Firefox, Safari, and Edge
- All user data must be stored in compliant regions (EU data stays in EU infrastructure)
- The system must not store raw/unprocessed user photos beyond the upload processing pipeline
10. Glossary
| Term | Definition |
|---|---|
| Match | A mutual connection formed when two users have both liked each other's profiles |
| Swipe | The gesture-based action of indicating interest (right/like) or disinterest (left/dislike) on a profile card |
| Profile Card | A visual representation of a user's profile, displaying their primary photo, name, age, and key details |
| Gallery | A collection of photos uploaded by a user to their profile, viewable by matches |
| Constellation | The visual metaphor used in the UI to represent potential connections between users on the discovery screen |
| CDN | Content Delivery Network — a distributed system for fast delivery of static assets like images |
| GDPR | General Data Protection Regulation — EU data privacy law governing user data rights |
| JWT | JSON Web Token — a compact, secure means of transmitting authentication information |
| Alembic | A database migration tool for SQLAlchemy/Python used to manage MySQL schema changes |
| WCAG | Web Content Accessibility Guidelines — international standards for web accessibility |
Document prepared by: System Requirements Engineering Agent Last Updated: 2026-02-27 Next Review: Prior to Sprint 1 Kickoff
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