Hi, I'm Chizi Humphrey.

Software engineering agency delivering custom digital products, internal platforms, and legacy modernization solutions.

• Architected the agency's primary web platform, design system, and client engagement workflows.
• Lead product engineering, technical strategy, and client delivery across custom web and mobile engagements.

Hyperlocal food discovery directory and surplus food recovery marketplace.

• Led end-to-end technical architecture across the cross-platform mobile application (React Native / Expo) and backend microservices (NestJS, PostgreSQL, Prisma, Redis, BullMQ).
• Architected the surplus food recovery flash drop engine, enabling neighborhood food vendors to recover revenue by offering timed discounts on fresh surplus meals.
• Built dual QR code counter verification system for instant, fee-free pickup handoffs between merchants and consumers.
• Spearheaded app store submission, beta testing, and production deployment across the Apple App Store and Google Play Console.

Part of the core team building modern payment infrastructure on the Stellar blockchain (https://www.payroutes.sh/) and the open-source Paykit unified payment SDK.

• Core contributor to the open-source Paykit SDK (paykit-sdk), implementing the complete LemonSqueezy payment provider, expanding Paystack integration, and resolving React 19 workspace type resolutions.
• Contributed to Stellar Tools (https://stellartools.dev), an open-source payment platform built on the Stellar network featuring Soroban smart contracts, customer portals, and hosted checkout flows.
• Engineered GoHighLevel (GHL) custom payments and Soroban subscription integrations, enabling automated recurring billing on Stellar.
• Built fiat offramps and automated payout rails using Stellar Anchors (SEP-24 / SEP-6) and LinkIO multi-chain FX API with fallback reconciliation jobs and error handling.
• Implemented automated overdue subscription invoice handling and robust webhook idempotency pipelines.

Hyperlocal marketplace connecting consumers with vetted runners for fresh market foodstuff shopping and doorstep delivery.

• Built the full mobile experience in React Native for iOS and Android from scratch, sharing a core component library with role-specific navigation and permissions.
• Designed and built the backend API and data layer powering both apps: order lifecycle, runner assignment, basket/pricing logic, WebSockets, and refund handling.
• Integrated a payment gateway for upfront secure checkout, handling authorization, webhook verification, and reconciliation.
• Introduced job queues (BullMQ + Redis) to decouple slow or unreliable operations (payment webhook processing, notifications, runner assignment) from the request/response cycle.
• Implemented caching for high-read paths to keep the live order-tracking experience fast under load.
• Built the admin frontend used by the operations team to monitor live orders, manage runners, and handle refund/dispute cases.

Comprehensive Proptech platform and admin ecosystem for renting and buying properties across Nigeria.

• Designed a unified GraphQL and REST API layer to serve both web and mobile clients from a single schema.
• Built the full mobile experience in React Native for iOS and Android: real-time chat with WebSocket and optimistic updates, push notification delivery, offline-first data sync, and subscription billing flows.
• Profiled API performance and identified repeated database reads as the core latency problem. Introduced Redis caching with TTL-based invalidation, cutting average response times by 50% without risking stale data.
• Delivered a Next.js admin dashboard with real-time data visualization and complex filterable tables, replacing spreadsheet-based operations and reducing manual overhead by 45%.
• Integrated AI-powered property search across both the backend pipeline and mobile UI, designing the integration to degrade gracefully when the third-party API was slow.
• Containerized services with Docker, configured AWS EC2 and S3 for hosting and file storage, and set up CI/CD pipelines so every merge to main was automatically tested and deployed.

Personalized digital gifting, voucher marketplace, and corporate rewards platform.

• Developed and shipped the cross-platform mobile application for iOS and Android using React Native and Expo.
• Engineered responsive, high-performance UI flows, custom gift card customization workflows, and animated transitions.
• Integrated seamless mobile checkout and payment gateway processing for instant digital voucher issuance.
• Collaborated with backend engineers to design mobile-optimized REST API endpoints and state synchronization.

Hybrid | Portharcourt, Rivers

Hybrid | Portharcourt, Rivers

Portharcourt, Rivers

• Developed user interfaces for client projects using React and vanilla JavaScript.
• Collaborated with senior developers on code reviews and bug fixes.
• Learned modern frontend development practices and design.