Backend Systems
Reliable APIs and database architecture built for production workloads
Database Architecture
PostgreSQL systems for applications requiring strong consistency and complex business logic
- Aurora Serverless that scales down when idle to save costs
- Stored procedures that keep business logic consistent and atomic
- Triggers that enforce rules automatically without extra application code
- Materialized views for fast dashboard queries and analytics
- ACID transactions with reservation patterns for safe concurrent access
- Double-entry bookkeeping for accurate financial records and audits
- Typed workflows that prevent invalid state transitions
- Built-in fuzzy search, scheduling, and encryption
- Optimized indexes tuned for your actual query patterns
- Secure connections with strict timeouts to prevent runaway queries
Serverless Backend Architecture
Focused Lambda functions that scale with traffic and stay secure in your VPC
API Handlers
Payments
Secure webhook handling with signature verification
Content
CRUD operations with efficient pagination for large lists
Wallets
Balance management with safe reservation handling
Users
Profile management, follows, and blocks with rate limiting
Transactions
History queries and export with privacy controls
Checkout
Payment flows with tax handling and user lookup
Admin
Protected admin endpoints with audit logging
Cognito Triggers
Token customization
Add user data to JWTs so the frontend has what it needs
Signup validation
Control who can register via social providers
Auth gateway
Bridge between auth and database layers
Account deletion
Clean up user data and payment info on delete
Welcome flow
Send welcome emails and set up new accounts
Admin auth
Verify admin permissions against the database
Scheduled Workers (EventBridge)
Stats refresh
Keep dashboards fast with scheduled updates
Content cleanup
Archive expired content automatically
Notification cleanup
Clear old notifications with failure alerting
Balance expiration
Handle time-limited credits and deposits
Email delivery
Reliable email sending with retry handling
Python Development Patterns
Clean, maintainable Python code with modern patterns
- Type hints throughout for better tooling and fewer bugs
- Context managers that handle cleanup automatically
- Consistent error handling with clear messages for debugging
- AWS integrations with automatic retries and backoff
- Shared utilities that keep code DRY across functions
- Secure cursor handling for safe pagination
- Transaction management that handles nested operations cleanly