LeviOnChain

VERIFIED CODEBASE CASE STUDIES

Production Architectures & Systems

Detailed technical breakdowns of smart contract protocols, high-frequency double-entry ledgers, and AI-driven financial platforms engineered by Ugwoke Levi.

Showing 8 of 8 verified projects
Web3 & Smart Contracts
2024 – 2025Active Development

Vortex — Multi-Chain Wagering & Financial Escrow Engine

High-frequency competitive gaming platform with append-only double-entry ledger, multi-chain Stellar & Base USDC settlement, and Azza in-app Nigerian Naira virtual bank rails.

Invariant: No Negative Balances: ∀ user u, balance(u) ≥ 0 at all states.
Settlement Currency100% USDC
Ledger Resolution1 micro-USDC
Platform Rake5% Pot
Physics Timestep100Hz Headless
Node.jsExpressTypeScript+1
Technical Case Study
Web3 & Smart Contracts
2024Open Source

Simple Ledger Contract — Auditor-First On-Chain Accounting

Translating double-entry accounting principles and financial control into on-chain Solidity invariants, validated through Socratic threat modeling.

Invariant: Balance Non-Negativity: No account balance may transition below zero under any execution path.
Security Invariants8 Formalized
MethodologyAuditor-First
Testing ToolchainFoundry & Hardhat
Accounting FrameworkDouble-Entry
SolidityFoundryHardhat
Technical Case Study
AI & Fintech Systems
2025Production

Monevo — Voice-First WhatsApp AI Financial Assistant

Voice-driven bookkeeping assistant built for the AssemblyAI Voice Agent Hackathon, parsing English and Nigerian Pidgin into financial ledgers with instant branded receipts.

Invariant: Strict Idempotency: Duplicate WhatsApp message IDs are discarded to prevent double-recording of transactions.
Voice Latency<1.2s Total
LanguagesEnglish & Pidgin
HackathonAssemblyAI 2025
Receipt OutputDynamic SVG/PNG
TypeScriptNode.jsExpress
Technical Case Study
Fullstack Systems
2024 – 2026Production

Sadza Connect — Zimbabwe’s Unified Digital Ecosystem

Multi-tenant commercial super-app uniting business directories, classified marketplaces, job boards, and municipal utility payments for Zimbabwe.

Invariant: Tenant Isolation via RLS: Users can only alter listings and records matching their authenticated user ID.
FrameworkNext.js 14 App Router
Security100% RLS Protected
Target MarketZimbabwe Nationwide
ClientAfricdominion Group
Next.js 14React 18TypeScript+1
Technical Case Study
Backend & Ledgers
2024Production

Shelter API — Faith-Based Mental Health Backend Platform

High-availability REST backend with Redis caching, JWT token rotation, and PostgreSQL transactions for therapy matching and resource delivery.

Invariant: Token Revocation Invariant: Logged-out or compromised refresh tokens are immediately blocked in Redis.
RuntimeNode.js 20
Cache Speedup7.5x Latency Reduction
Auth StandardJWT + Redis Rotation
Node.js 20Express.jsTypeScript 5
Technical Case Study
AI & Fintech Systems
2024Production

ALG Kustomers CRM & Miss Algorithm AI Co-Pilot

Multi-tenant CRM REST backend (PHP 8 + MySQL) paired with a loopback FastAPI Python AI co-pilot service and WhatsApp outreach automation.

Invariant: Loopback Isolation: The AI microservice binds strictly to 127.0.0.1 and cannot be called without verified PHP API gateway signature.
ArchitectureGateway + Loopback AI
Security BaselineOWASP Compliant
Python 3.11FastAPIPHP 8+
Technical Case Study
Backend & Ledgers
2025 – PresentProduction

Zetoe Academy — High-Integrity Online Examination Platform

Access-controlled examination delivery system handling 1,000+ simultaneous tests with automated scoring and 99.9% uptime.

Invariant: Immutable Exam Submission: Once submitted or expired, an exam state is locked against modifications.
Exams Managed1,000+
Uptime99.9%
PythonDjangoDjango REST Framework
Technical Case Study
Backend & Ledgers
2023 – 2024Production

Fortress Finance — High-Concurrency Financial Investment Engine

Investment platform backend serving 500+ active investors with sub-200ms API response times and strict financial data integrity.

Invariant: Zero Discrepancy Reconciliation: Portfolio values equal sum of verified deposits and accrued earnings.
Response Latency<200ms
Active Users500+ Concurrent
PythonDjangoDjango REST Framework
Technical Case Study