David Ohiwerei
Web & App Developer

I implement multi-layer caching to ensure apps respond instantly — even under heavy load — by serving pre-computed data instead of hitting the database on every request.

• Redis for in-memory caching of sessions, queries, and API responses
• HTTP cache headers (ETag, Cache-Control) to minimize server roundtrips
• Database query result caching with cache invalidation on write operations
• CDN integration for static assets and edge-cached API responses
• Fragment caching in Laravel to avoid re-rendering expensive views

I design backend systems that can handle growth using intermediate scaling techniques that balance complexity with performance gains.

• RESTful API design with versioning, pagination, and rate limiting
• Queue-based job processing with Laravel Queues and Redis to offload heavy tasks
• Database read replicas for separating read/write operations
• Load balancing basics with multiple application servers
• Service layer patterns for cleaner, maintainable code organization

Security is not an afterthought — it's baked in from the start. I apply industry-standard practices to protect user data, prevent attacks, and ensure compliance.

• SQL injection prevention with prepared statements and parameterized queries (PDO)
• XSS and CSRF protection using Laravel's built-in middleware and token validation
• JWT and basic OAuth2 authentication with token expiry
• Password hashing with bcrypt; no plain-text storage ever
• Input validation and sanitization on every API endpoint and form
• HTTPS enforcement, HSTS headers, and secure cookie configuration
• Rate limiting to block brute-force attempts at the API layer

A slow database brings down even the best application. I design schemas carefully and tune queries so that the database is never the bottleneck.

• Index design and EXPLAIN query analysis to eliminate full table scans
• Database normalization and strategic denormalization for read performance
• Eloquent ORM with eager loading to prevent N+1 query problems
• Database migrations and seeders for reproducible, version-controlled schemas
• Soft deletes and audit trails for data integrity and recovery

From live chat in CampusConnect to real-time game state in Ludo Royale, I build low-latency, event-driven backends that push data to clients the instant it changes.

• WebSocket servers with Socket.io for bidirectional real-time communication
• Firebase Realtime Database and Firestore for mobile real-time sync
• Server-Sent Events (SSE) for one-way streaming use cases
• Event broadcasting with Laravel Echo for web apps
• Connection management, reconnection logic, and presence channels

I understand the fundamentals of DevOps and can handle basic deployment, server management, and maintenance tasks while working with experienced DevOps engineers on complex infrastructure.

• Git version control with feature-branch workflows
• Environment-based configuration (.env) with no secrets in version control
• Basic server setup (LAMP/LEMP stacks) and deployment
• Error logging and monitoring with structured logs
• Automated database backups and recovery procedures
• Basic CI/CD understanding (GitHub Actions basics)
• RESTful API documentation for frontend teams