How We Architect Apps

Real-world architecture showcases — see how we pick and connect 27+ technologies to build everything from SaaS dashboards to ride-sharing platforms.

5 Project Showcases27 TechnologiesWeb & Mobile
Full-Stack Web App

InvoiceFlowSaaS Invoicing Dashboard

A multi-tenant SaaS platform where freelancers and agencies create, send, and track invoices. OAuth-based authentication with Auth.js, real-time payment tracking via Stripe webhooks, automated PDF generation, Redis-backed session management, and containerized deployment on AWS ECS.

Client
Next.jsNext.js
Auth
AAuth.js
API
Node.jsNode.js
Payments
StripeStripe
Cache
RRedis
Data
PostgreSQLPostgreSQL
DevOps
DDocker
Cloud
AWSAWS

Why These Technologies?

Next.js

Next.js

Server-side rendering for instant invoice loading and SEO-indexable public pages. App Router with React Server Components handles the marketing site and authenticated dashboard in a single codebase with automatic code splitting.

React

React

Component architecture breaks the complex invoice builder into composable pieces — line items, tax calculators, PDF preview panels, and client selectors — all sharing state through context and hooks.

TypeScript

TypeScript

Invoice calculations can't afford runtime type errors. Strict typing across the entire stack — from API contracts to Prisma models — prevents billing bugs before they reach production.

Tailwind CSS

Tailwind CSS

Utility-first CSS for rapid iteration on the invoice builder UI. The PDF preview needs pixel-perfect styling that utility classes deliver with minimal bundle size and zero CSS-in-JS runtime cost.

A

Auth.js

OAuth providers (Google, GitHub), JWT session strategy with Redis-backed storage, CSRF protection, and middleware-based route guarding. Multi-tenant session isolation prevents cross-tenant data leakage.

Node.js

Node.js

Handles concurrent invoice generation and PDF exports without blocking. Express middleware pipeline for validation, rate limiting, and structured error handling. The npm ecosystem provides battle-tested libraries for PDFs, emails, and CSV exports.

Stripe

Stripe

Stripe Billing for SaaS subscriptions with metered usage, Stripe Invoicing for client-facing invoices, and Radar for real-time fraud detection. Webhooks keep payment status synced — handling retries, disputes, and refunds automatically.

R

Redis

In-memory session store for Auth.js with automatic TTL expiry. API rate limiting with sliding window counters prevents abuse. Caches frequently accessed invoice templates and tenant configuration for sub-millisecond reads.

PostgreSQL

PostgreSQL

ACID transactions ensure invoices and payments never reach an inconsistent state. Row-level security policies isolate tenant data at the database layer. JSONB columns store flexible line item metadata without schema migrations.

D

Docker

Multi-stage builds produce minimal Node.js images (< 100MB). Docker Compose orchestrates local development with PostgreSQL, Redis, and MailHog services. Identical container images run in CI, staging, and production.

AWS

AWS

ECS Fargate for serverless container orchestration with auto-scaling. S3 for PDF storage with presigned URLs, CloudFront CDN for global delivery, and SES for transactional invoice emails with bounce handling.

Cross-Platform Mobile

FitTrackMobile Fitness App

A fitness tracking app for iOS and Android built with React Native. Users log workouts, track progress with interactive charts, compete on leaderboards, and unlock premium plans via in-app subscriptions. Firebase handles auth and push notifications, Redis powers real-time leaderboards, and MongoDB stores flexible workout data.

App
React NativeReact Native
API
Node.jsNode.js
Billing
RevenueCatRevenueCat
Cache
RRedis
Data
MongoDBMongoDB
Cloud
FirebaseFirebase
AWSAWS

Why These Technologies?

React Native

React Native

One codebase for iOS and Android, sharing 90%+ of workout tracking logic. New Architecture with Fabric renderer delivers native performance for smooth chart animations, gesture-based interactions, and real-time data updates.

TypeScript

TypeScript

Type-safe workout data models prevent bugs in exercise tracking calculations. Shared type definitions between the React Native app and Node.js API ensure end-to-end type safety across the entire stack.

JavaScript

JavaScript

Runs natively in React Native's Hermes engine. Access to the largest package ecosystem for fitness calculations, chart rendering (Victory Native), and offline-first data sync with WatermelonDB.

Firebase

Firebase

Firebase Auth for phone number and social login, Cloud Messaging for workout reminders and achievement notifications, Crashlytics for real-time crash reporting, and Analytics for tracking user engagement funnels.

Node.js

Node.js

Express API handles workout sync, leaderboard calculations, and background job processing with BullMQ. Event-driven I/O efficiently manages thousands of concurrent fitness data uploads during peak gym hours.

RevenueCat

RevenueCat

Handles App Store and Play Store subscription complexity — receipt validation, free trial management, paywall A/B testing, and grace period handling — so the team focuses on fitness features, not billing edge cases.

R

Redis

Sorted sets power real-time leaderboards with O(log N) ranking queries. Caches user profiles and workout templates for sub-millisecond reads. Pub/Sub channels broadcast live challenge updates to connected participants.

MongoDB

MongoDB

Flexible document model stores varied workout types — weightlifting sets with progressive overload, running routes with GPS coordinates, yoga sessions with hold durations — without rigid schema migrations for each new exercise type.

AWS

AWS

ECS Fargate for auto-scaling API containers during peak hours. S3 for workout photo storage and progress images. CloudWatch alarms for API latency monitoring and automatic scaling triggers.

Enterprise Platform

Nexus CRMEnterprise Sales Platform

An enterprise CRM for mid-size sales teams with Azure AD SSO, role-based access control, full-text search powered by Elasticsearch, and gRPC microservices written in Go. Redis handles session caching and pub/sub for real-time pipeline updates, while Docker and Kubernetes manage the deployment lifecycle on Azure.

Client
AngularAngular
Identity
AAzure AD
API
GoGo
EElasticsearch
Payments
PayPalPayPal
Cache
RRedis
Data
PostgreSQLPostgreSQL
DevOps
DDocker
Cloud
AzureAzure

Why These Technologies?

Angular

Angular

Full-featured platform with built-in routing, reactive forms, HTTP interceptors, and dependency injection. Enterprise teams get a structured, opinionated architecture with strict typing, lazy-loaded modules, and RxJS for complex data streams like real-time pipeline updates.

TypeScript

TypeScript

Angular's first-class TypeScript integration catches data model errors at compile time. Complex CRM entities — contacts, organizations, deals, pipeline stages, custom fields — benefit from strict typing and interface-driven development.

A

Azure AD

Enterprise SSO with SAML/OIDC, multi-factor authentication, conditional access policies, and fine-grained RBAC. Microsoft Graph API integration enables pulling org charts and contact data directly from clients' Active Directory tenants.

Go

Go

Compiles to a single static binary that starts in milliseconds and handles massive concurrency with goroutines. gRPC services with Protocol Buffers deliver type-safe inter-service communication at 10x the throughput of REST JSON.

E

Elasticsearch

Full-text search across millions of contacts, deals, and activity logs with sub-100ms query times. Aggregation pipelines power pipeline analytics dashboards, sales forecasting, and custom reporting views.

PayPal

PayPal

430M+ active accounts provide instant trust for B2B invoicing. Buyer and seller protection with multi-currency support handles international sales team workflows. PayPal Payouts API for bulk commission payments to sales reps.

R

Redis

In-memory session caching with automatic TTL for authenticated users. Pub/Sub channels broadcast real-time deal updates to all connected dashboard clients. Rate limiting protects API endpoints from abuse by integration partners.

PostgreSQL

PostgreSQL

Complex CRM queries — pipeline reports, contact deduplication, deal forecasting with window functions — require a battle-tested relational database. Row-level security isolates tenant data. Full-text search indexes handle basic search before graduating to Elasticsearch.

D

Docker

Multi-stage builds produce minimal Go binaries (< 20MB images). Helm charts manage Kubernetes deployments with environment-specific configurations. Docker Compose replicates the full microservice stack locally for integration testing.

Azure

Azure

AKS (Azure Kubernetes Service) for orchestrating Go microservices with horizontal auto-scaling. Azure Blob for document storage, Functions for event-driven workflows (email triggers, data enrichment), and comprehensive compliance certifications (SOC 2, HIPAA) required by enterprise clients.

Content Platform

PulseContent & Publishing Platform

A multi-source content platform that aggregates articles from Sanity and Contentful into a unified reading experience. Supabase handles auth with row-level security, Neon provides serverless Postgres for analytics, and Redis caches rendered content at the edge. Vue.js powers the reader app while Next.js drives the admin panel.

Frontend
Vue.jsVue.js
Next.jsNext.js
CMS
SanitySanity
ContentfulContentful
Backend
SupabaseSupabase
NeonNeon
Cache
RRedis
Cloud
AWSAWS

Why These Technologies?

Vue.js

Vue.js

Progressive framework for the reader-facing app with Nuxt.js for SSR. Fine-grained reactivity minimizes re-renders on content-heavy pages. Composition API organizes complex reading features — bookmarks, highlights, reading progress — into reusable composables.

Next.js

Next.js

Server-side rendering for the editor and admin panel with built-in API routes and middleware. Image optimization pipeline automatically serves responsive content images. ISR (Incremental Static Regeneration) rebuilds article pages on content updates without full deploys.

Tailwind CSS

Tailwind CSS

Shared design system tokens across both Vue and Next.js apps. Utility classes ensure the reader experience and admin panel share visual DNA without duplicating CSS. Responsive typography scales cleanly across mobile, tablet, and desktop readers.

Sanity

Sanity

Real-time collaborative editing with live presence indicators for the content team. GROQ query language lets the frontend request exactly the content shape it needs — no over-fetching. Portable Text format enables rich content with embedded components.

Contentful

Contentful

API-first CMS for structured content that feeds multiple channels — web, mobile app, newsletter. GraphQL Content API lets the admin panel compose complex queries for content auditing, cross-referencing, and migration tools.

Supabase

Supabase

Built-in auth with OAuth providers and magic links for reader accounts. Real-time subscriptions power live comments and collaborative annotations. Row-level security policies enforce content access rules — premium articles, team-only drafts, embargo dates — at the database layer.

Neon

Neon

Serverless Postgres that scales to zero — perfect for analytics queries that spike during business hours and idle overnight. Database branching creates isolated preview environments for content staging. Connection pooling handles burst traffic from viral articles.

R

Redis

Edge caching for rendered article content with intelligent invalidation on CMS webhook events. Session storage for authenticated readers. Rate limiting protects the content API from scraping while maintaining fast response times for legitimate traffic.

AWS

AWS

S3 for media storage with lifecycle policies archiving old assets to Glacier. CloudFront CDN delivers images globally with automatic WebP/AVIF conversion. Lambda@Edge runs content transformations — OpenGraph image generation, RSS feed building — at edge locations nearest to readers.

Multi-Platform Mobile

RideNowRide-Sharing Platform

A ride-sharing platform with native iOS (Swift) and Android (Kotlin) rider apps, plus a cross-platform Flutter driver app. Python FastAPI powers the matching engine with PostGIS for geospatial queries, Kafka handles event streaming for ride lifecycle events, Redis GeoSearch tracks real-time driver positions, and Stripe Connect manages rider payments and driver payouts.

Apps
SwiftSwift
KotlinKotlin
FlutterFlutter
API
PythonPython
KKafka
Services
FirebaseFirebase
AWSAWS
Cache
RRedis
Data
PostgreSQLPostgreSQL
Payments
StripeStripe

Why These Technologies?

Swift

Swift

Native iOS development with SwiftUI delivers the smoothest rider experience — real-time GPS tracking with Core Location, Apple Pay integration for one-tap payments, CallKit for in-app driver calls, and system-level push notifications with critical alerts for ride updates.

Kotlin

Kotlin

Google's preferred Android language with coroutines for async GPS updates and null safety preventing crashes — critical for an app handling millions of ride requests daily. Jetpack Compose for declarative UI with smooth map animations and driver ETA overlays.

Flutter

Flutter

Cross-platform driver app from a single Dart codebase — rapid feature iteration for the driver experience. Impeller rendering engine delivers smooth 120fps map animations. Platform channels bridge to native GPS and camera for document verification.

Dart

Dart

Flutter's native language with ahead-of-time compilation for native ARM performance. Sound null safety prevents crashes in the driver app's real-time location tracking. Isolates enable background GPS processing without blocking the UI thread.

Python

Python

FastAPI backend for the ride-matching engine with async/await for high concurrency. Python's data science ecosystem (NumPy, scikit-learn) enables surge pricing algorithms, ETA predictions with ML models, and route optimization using graph algorithms.

Firebase

Firebase

Firebase Auth for phone-number verification (industry standard for ride-sharing). Real-time Database for live driver location broadcasting to riders. Cloud Messaging for ride request push notifications with high-priority delivery. Crashlytics monitors app stability across hundreds of device models.

R

Redis

GEOSEARCH commands find nearest available drivers within a radius in O(log N) time. Sorted sets rank drivers by distance and rating. Pub/Sub channels broadcast ride status updates to all participants. Rate limiting prevents request flooding during peak demand.

PostgreSQL

PostgreSQL

PostGIS extension powers geospatial queries — finding rides within a polygon, calculating route distances, and geofencing for airport/event surge zones. ACID transactions ensure ride state machine transitions (requested → matched → in-progress → completed) are atomic and consistent.

K

Kafka

Event streaming backbone for the ride lifecycle — ride.requested, driver.matched, ride.started, ride.completed events flow through topics consumed by payment, analytics, and notification services. Exactly-once delivery guarantees prevent duplicate charges or missed payouts.

Stripe

Stripe

Stripe Connect handles the two-sided marketplace — riders pay, drivers get paid, and the platform takes a commission — all managed through a single integration. Real-time payouts for drivers, built-in dispute handling, and support for 135+ currencies enable international expansion.

AWS

AWS

EKS (Elastic Kubernetes Service) orchestrates Python microservices with horizontal pod autoscaling during peak ride hours. ElastiCache (managed Redis) for geo-caching with multi-AZ replication. CloudWatch dashboards monitor matching latency, ride completion rates, and payment success metrics.

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