PHASE 1 — Project Setup ✅

Build:

• React frontend
• FastAPI backend
• PostgreSQL database

Do:

• Setup repository
• Setup TypeScript
• Setup FastAPI
• Setup PostgreSQL connection

Learn:

• Client-server architecture
• REST APIs
• Environment variables

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PHASE 2 — Basic Todo CRUD ✅

Build:

• Create Todo
• Update Todo
• Delete Todo
• Complete Todo

Learn:

• HTTP methods
• CRUD operations
• Database schema design

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PHASE 3 — Database Design ✅

Build:

• Users table
• Todos table
• Projects table

Learn:

• Foreign keys
• Relationships
• Indexes
• Constraints

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PHASE 4 — Authentication ✅

Build:

• Signup
• Login
• Logout

Learn:

• JWT
• Access tokens
• Refresh tokens
• Password hashing

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PHASE 5 — Authorization ✅

Build:

• Owner
• Admin
• Member

Learn:

• RBAC
• Permission systems
• Middleware

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PHASE 6 — Validation ✅

Build:

• Request validation

Learn:

• Pydantic
• DTOs
• Data validation

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PHASE 7 — File Uploads ✅

Build:

• Profile picture
• Todo attachments

Learn:

• Multipart forms
• Object storage
• File processing

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PHASE 8 — Redis Introduction ✅

Build:

• Cache user profiles

Learn:

• Key-value stores
• Cache-aside pattern
• TTL

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PHASE 9 — Sessions ✅

Build:

• Session storage

Learn:

• Session management
• Redis sessions

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PHASE 10 — Rate Limiting ✅

Build:

• Limit API abuse

Learn:

• Sliding windows
• Token bucket
• Distributed rate limiting

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PHASE 11 — WebSockets ✅

Build:

• Live todo updates

Learn:

• Persistent connections
• Real-time communication

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PHASE 12 — Presence System ✅

Build:

• Total Online users
• Total no of todos and projects Created

Learn:

• Connection tracking
• State synchronization

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PHASE 13 — Notifications ✅

Build:

• Real-time notifications

Learn:

• Event systems
• Notification architecture

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PHASE 14 — Background Jobs ✅

Build:

• Reminder processing

Learn:

• Workers
• Async processing

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PHASE 15 — Email Service ✅

Build:

• Verification emails
• Reminder emails

Learn:

• SMTP
• Queues

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PHASE 16 — Search ✅

Build:

• Search todos

Learn:

• Full-text search
• Query optimization

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PHASE 17 — Activity Feed ✅

Build:

Todo Created
Todo Completed
Todo Updated

Learn:

• Audit logs
• Event sourcing basics

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PHASE 18 — Logging ✅

Build:

• Structured logs

Learn:

• Log levels
• Correlation IDs

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PHASE 19 — Monitoring ✅

Build:

• Prometheus metrics

Learn:

• Metrics
• Latency
• Throughput

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PHASE 20 — Grafana Dashboards ✅

Build:

• Request dashboard
• User dashboard

Learn:

• Observability

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PHASE 21 — Loki ✅

Build:

• Centralized logs

Learn:

• Log aggregation

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PHASE 22 — Tempo ✅

Build:

• Request tracing

Learn:

• Distributed tracing

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PHASE 23 — Docker ✅

Containerize:

• Frontend
• Backend
• Redis
• PostgreSQL

Learn:

• Images
• Volumes
• Networks

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PHASE 24 — Docker Compose ✅

Build:

• One-command startup

Learn:

• Service orchestration

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PHASE 25 — CI/CD ✅

Build:

• Automated deployment

Learn:

• GitHub Actions
• Pipelines

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PHASE 26 — Production Deployment ✅

Deploy:

• VPS

Learn:

• Nginx
• SSL
• Domains

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PHASE 27 — Reverse Proxy ✅

Build:

• Nginx routing

Learn:

• Load balancing
• Reverse proxies

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PHASE 28 — AI Todo Creation

Build:

Create a task to study DSA tomorrow at 7 PM

AI creates task.

Learn:

• LLM APIs
• Prompt engineering

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PHASE 29 — AI Task Breakdown

Build:

Build a startup

↓

Subtasks generated.

Learn:

• Agent workflows

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PHASE 30 — AI Weekly Planner

Build:

• Weekly scheduling

Learn:

• Tool calling
• Context management

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PHASE 31 — Calendar Integration

Build:

• Google Calendar sync

Learn:

• OAuth2
• Third-party APIs

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PHASE 32 — Analytics Service

Build:

• Productivity analytics

Learn:

• Event processing
• Aggregation

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PHASE 33 — Event-Driven Architecture

Convert:

Todo Created
Todo Updated
Todo Deleted

into events.

Learn:

• Event systems

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PHASE 34 — RabbitMQ

Build:

Todo Service
      |
   RabbitMQ
      |
Notification Worker

Learn:

• Message brokers
• Dead-letter queues

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PHASE 35 — Kafka

Build:

• Event streaming

Learn:

• Topics
• Partitions
• Consumer groups

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PHASE 36 — Microservices

Split into:

Auth Service
Todo Service
Analytics Service
Notification Service
AI Service

Learn:

• Service boundaries

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PHASE 37 — API Gateway

Add:

• Routing
• Authentication
• Rate limiting

Learn:

• Gateway architecture

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PHASE 38 — Kubernetes

Deploy:

• Frontend
• Backend
• Redis
• PostgreSQL

Learn:

• Pods
• Services
• Deployments

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PHASE 39 — Terraform

Provision:

• Servers
• Databases
• Kubernetes

Learn:

• Infrastructure as Code

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PHASE 40 — Enterprise Scale

Build:

Read Replicas

Writes -> Primary
Reads -> Replica

Sharding

Users 1-1M
Users 1M-2M
Users 2M-3M

Multi-Tenant SaaS

Company A
Company B
Company C

Feature Flags

Enable AI
Disable AI

Billing

• Free
• Pro
• Enterprise

Global Deployment

• Asia
• Europe
• US

Auto Scaling

• Scale workers automatically

Disaster Recovery

• Automated backups
• Restore testing