Senior PHP Developer

PhiTech Labs is looking for a senior backend developer who can own production systems end to end, from design to deployment, and explain technical decisions clearly to clients.

📍 Location / Mode: Noida

🛠 Stack: PHP, CodeIgniter, MySQL, Redis

What you’ll do

• Build and maintain scalable backend apps and REST APIs on CodeIgniter
• Design normalized MySQL schemas and optimize slow queries (EXPLAIN, indexing, N+1 fixes)
• Implement Redis caching, queues, workers, retries and batching
• Build reliable inventory and stock flows under concurrent load (transactions, row locking, atomic updates)
• Integrate third-party APIs and payment gateways with idempotent webhooks and failure recovery
• Apply security best practices: auth, SQL injection/XSS/CSRF prevention, S3 pre-signed URLs
• Own CI/CD, migrations, rollbacks and production troubleshooting
• Work directly with clients on requirements, trade-offs and timelines
• Must-have

✅ 8+ years of PHP backend development

✅ Strong OOP and SOLID, applied in real code

✅ Deep CodeIgniter and MVC knowledge (route → controller → service → model)

✅ Advanced MySQL: JOINs, GROUP BY/HAVING, subqueries, window functions

✅ Redis in production: caching, invalidation, sessions, multiple DB connections

✅ Transactions, isolation levels, locking and overselling prevention

✅ Idempotent payment webhooks, retries and backoff

✅ Clear spoken and written English; comfortable with client-facing work

Good to have

➕ AWS (S3), CodeIgniter 4 / CI3 migration, Laravel, Docker, PHPUnit

➕ E-commerce, inventory or payment-heavy systems

Heads-up: The technical round is hands-on (live SQL, Redis, concurrency and webhook scenarios). We’re prioritizing people who have built and supported these in production.

📩 Apply: Send your CV to sneha.das@phitechlabs.com or DM us.