01
Customer storefront and shopping flow
Search, filtering, product details, variants, dual cart storage, promo logic, checkout, and order confirmation for both guests and logged-in customers.
PHP sessionsDual cart storagePromo engine
Marketplace infrastructure · E-commerce operations
CampusXpress packs a full marketplace stack into one custom build.
A multi-vendor marketplace for campus environments with vendor onboarding, payment security, affiliate attribution, AI recommendations, and a large admin control surface built from scratch.
Project signal
45+
Relational tables across 10 tiers supporting commerce, vendors, support, promotions, and analytics.
Live project
campxpress.rf.gd ->45+Tables across 10 relational tiers
50+PHP files supporting customer, vendor, and admin surfaces
28Platform settings configurable via admin
15Global campuses registered in the system
What I built
Six interlocking commerce systems.
This was a production-style marketplace with vendor ops, customer flows, recommendations, attribution logic, and admin governance built into one codebase.
02
Paystack payment integration
Hosted checkout, webhook handling, HMAC signature validation, and transaction-safe order confirmation with stock locking.
PaystackHMAC verificationStock locking
03
Multi-vendor ecosystem
Vendor onboarding, KYC, inventory and product management, review workflows, payout tracking, and isolated dashboard sessions.
KYCVendor analyticsPayout ledger
04
Affiliate and referral system
Cookie-based attribution with ledger entries, referral resolution at checkout, and configurable commission behavior.
Cookie attributionLedger systemLast-click model
05
AI recommendations
Recombee-backed product suggestions with graceful fallback behavior so recommendation failures never break page rendering.
RecombeeView loggingGraceful fallback
06
Admin control centre
Approvals, disputes, support tickets, analytics, exports, payout oversight, moderation, and platform-level settings from one admin surface.
RBACAudit logsExports
Tech stack
Chosen to control state-heavy commerce flows.
PHP 8+
Checkout, sessions, vendor flows, and backend orchestration.
MySQL
Transactions, relational integrity, and structured commerce records.
Paystack API
Payments, verification, and webhook-driven state changes.
Recombee
Personalized recommendation workflows fed by user behavior.
PHPMailer
Transactional emails across account and order states.
Security layer
HMAC validation, session hygiene, and role-based admin controls.
Engineering challenges
The hard part was protecting integrity under real usage.
Area
Race conditions
Problem
Two buyers could try to purchase the last item at the same time.
Solution
Checkout stock checks run inside a transaction with row-level locking using SELECT ... FOR UPDATE.
Area
Cart persistence
Problem
Guest carts can disappear on login if not migrated carefully.
Solution
Session cart data is merged into the database cart automatically after login.
Area
Payment security
Problem
Fake payment success callbacks could confirm unpaid orders.
Solution
Every Paystack webhook is HMAC-validated before any order state changes are accepted.
Area
Price integrity
Problem
Live price changes after purchase could corrupt invoices and order history.
Solution
Order items store immutable purchase-time pricing snapshots for all later calculations.
Outcomes
Why the system matters.
Academic to production
Built as a final year project and evolved into a production-grade marketplace.
AI-native commerce
Recommendations were integrated into the experience instead of bolted on later.
Global by design
The platform shipped with multi-campus breadth from launch.
About
I like products where logic matters more than cosmetics.
CampusXpress reflects how I approach product engineering: design the model properly, isolate failure points, secure transactional flows, and make admin operations workable.
I'm strongest where backend logic, data integrity, and business workflow complexity overlap.
Core skills
PHPMySQLPaystackRecombeeRBAC
Contact
Need someone who can think through complex product flows?
I am open to backend-heavy product roles that need architecture, workflow logic, and systems thinking.