Zain Ul Abdain B.

Reliable payments and APIs for your PHP/Laravel app. I integrate Stripe Connect and PayPal, fix webhook retries and duplicate processing, and reconcile gateway records with your internal ledger. I'm a senior backend engineer based in Dubai, UAE (UTC+4), with 8+ years of PHP/Laravel experience. WHAT I CAN HELP YOU DELIVER • Marketplace payments: Stripe Connect vendor payouts with platform commissions • Payment integrations and fixes: Stripe, PayPal, Escrow, Wise, CCAvenue, Square and NMI, including refunds and disputes • Reliable webhooks: signature verification, duplicate-event protection, safe retries and reconciliation • Laravel backend development: REST APIs, third-party integrations, queues and multi-tenant SaaS • Upgrades, security and performance: PHP 8.x migrations, OWASP-style security fixes, MySQL/PostgreSQL tuning and Redis caching RELEVANT WORK • Aviaspares FZE, B2B/B2C aviation-parts marketplace: led backend delivery, including multi-gateway payment flows, Stripe Connect payouts with automatic platform commission, and reconciliation jobs comparing gateway records against the internal ledger. • Current freelance client (under NDA): maintaining and hardening a PHP booking engine across 14 paid milestones, including a PHP 8.2 → 8.4 migration, fixes for account takeover, XSS, CSRF and privilege escalation, an OWASP Top 10 review, and Square, NMI and Stripe payment fixes. • SchoolNinty, my own multi-tenant school-management SaaS: sole engineer from architecture to production (Laravel 13, PHP 8.4, Inertia + Vue 3, PostgreSQL, Redis; 2,200+ automated tests). Open-source Laravel packages (on Packagist, linked in my portfolio): • laravel-webhook-ledger: signature verification, atomic event deduplication, replay and a durable event log • laravel-route-permissions: route-derived permissions with fail-closed enforcement HOW I WORK I own features from requirements through testing, deployment and production monitoring: PHPUnit tests, code review, static analysis and structured releases. I use Claude Code daily and review and validate every AI-generated change before release. Send me your stack, the payment or API flow you need, and what is currently failing, and we'll define a focused first deliverable.