Joshua Ojoawo

Architected NestJS/Node.js microservices with event-driven patterns and Bull/Redis queues scaling to 50,000+ concurrent users with 99.9% uptime. Optimized Prisma + PostgreSQL performance (indexing, query tuning, connection pooling, read replicas) reducing API latency from ~800ms to ~120ms. Built an API gateway with rate limiting, JWT/RBAC, and OpenAPI versioning to support 2M+ requests daily. Established CI/CD with Docker multi-stage builds, Bitbucket Pipelines, automated tests, and blue-green deploys for zero-downtime releases and faster deployments. Drove AWS DR, autoscaling, observability (MTTR improvements), and security hardening aligned with OWASP practices. Delivered Next.js 14 frontend improvements with App Router/RSC, strict TypeScript, streaming SSR, and a typed design system.

Architected and shipped a production React Native (Expo) crypto app for buy/sell/swap/send supporting BTC/ETH/XRP/USDT/APT with 50,000+ MAU and $1.5M revenue. Implemented bank-grade security with SSL, multi-sig wallet authentication, 2FA, and biometric flows via Expo SecureStore. Built real-time pricing using WebSockets with resilient state and optimistic UI for sub-second refresh and 99.8% crash-free sessions. Scaled engineering from 2 to 7 engineers, improved wallet security onboarding retention, and increased deploy frequency. Set up EAS build pipelines for iOS/Android and optimized bundles via code-splitting and assets.

Zero-to-one architecture for a rental marketplace monorepo using Next.js (App Router) and a NestJS API with Prisma/Redis. Implemented role-based experiences for tenants, landlords, and admins with clear domain boundaries for listings, leases, applications, agreements, disputes, inspections, and subscriptions. Built payments and growth loops (Paystack), affiliate program APIs/dashboards, and real-time messaging via WebSocket gateway patterns. Led verification/fraud-awareness modules and operational tooling (audit/notifications/admin demographics) to deliver a production-grade marketplace feel.