Senior backend engineer with 5+ years building production-grade Ruby on Rails APIs. Currently at Tadarab owning payment architecture, subscription systems, and B2B SaaS infrastructure for a growing EdTech platform in Kuwait.

What I specialize in:

• 🤖 AI-native engineering — agentic coding workflows, LLM tool/MCP orchestration, and multi-agent system design integrated into daily practice to accelerate delivery and reduce cognitive overhead
• 🏗️ Designing backend systems for scale and long-term maintainability — explicit service layers, state machines, partitioned schemas — built to stay comprehensible as teams and traffic scale
• ⚡ API performance engineering — query optimization, caching, async job architecture — with systems designed to scale and correctness guarantees that hold under load (~95% reduction in failed transactions)
• 🧠 Architectural decision-making grounded in actual NFRs — strong consistency where money is involved, eventual consistency where fan-out allows it, trade-offs made explicit, not discovered in production
• 💳 Financial infrastructure correctness — multi-gateway integrations, double-entry ledgers, idempotency guarantees, HMAC-signed webhook delivery — shipped across 7 payment providers in production
• 📦 Subscription and growth systems — referral programs, upsell flows — ~55% upsell boost and ~40% improvement in subscriber retention in production
• 🔧 Automation over manual toil — converting high-frequency repetitive processes into parameterized async services and background pipelines, cutting resolution time by up to 90% and freeing teams to focus on what can't be automated
• 🧪 Quality before shipping — comprehensive unit and integration suites, cross-environment validation (staging → production), and agentic testing with tools like Playwright MCP to catch regressions before they reach users

Former Senior Technical Mentor at Microverse — reviewed code and mentored 100+ developers worldwide across Ruby on Rails and JavaScript.

A production-grade payment gateway — built as a complete, multi-repo system

Paygate is a full-stack payment infrastructure portfolio: a REST API, merchant dashboard, developer documentation site, and a drop-in JavaScript SDK (@paygater/js) published on npm. Engineered with financial-grade patterns: double-entry ledger, idempotency, HMAC-signed webhook delivery, and a charge state machine.

POST /v1/charges
       │
       ▼
AuthenticateRequest       ← API key (sk_test_xxx) or JWT session
       │
       ▼
IdempotencyService        ← Redis 24h lock per Idempotency-Key header
       │
       ▼
PaymentRouterService      ← Strategy pattern: routes by payment_method + environment
       │
       ├── StripeAdapter       → Visa / Mastercard / Apple Pay
       └── CheckoutAdapter     → Mada
       │
       ▼
ChargeService             ← State machine · double-entry ledger · audit log
       │
       ▼
WebhookDispatcherService  → Sidekiq → HMAC-SHA256 signed · exponential retry (5 attempts)

Charge lifecycle: PENDING → AUTHORIZED → CAPTURED → REFUNDED / FAILED / VOIDED

Key design rules:

• Business logic lives in app/services/ — controllers call one service and render
• Financial data is never cached — always read live from the database
• Every financial state change writes a double-entry LedgerEntry
• Every merchant action writes an immutable AuditLog
• No PAN, CVV, or raw card data ever touches the server — client-side tokenization only

Backend

Auth & Security

Payment & Integrations

Cloud & DevOps

Monitoring & Observability

Testing & Quality

Frontend (supporting)

Technical deep-dives on backend engineering, distributed systems, and production architecture.

Building things that process real money, serve real users, and stay up.