Engineering High-Performance Backends & Distributed Financial Systems.
Hi, I’m Ugwoke Levi. A backend engineer specializing in Node.js (TypeScript, Express) with production experience in Python (FastAPI, Django) and an accounting background (B.Sc.). Building high-throughput REST/WebSocket APIs, PostgreSQL ledgers with ACID row-locking, and Redis caching—with practical working knowledge of Solidity smart contracts and multi-chain settlement rails.
- 3+ Years
- Production Systems
- Sub-Millisecond
- Ledger Performance
- 99.9%
- Production Uptime
- Multi-Chain
- Web3 Knowledge
Building scalable Node.js & Python backends, high-throughput APIs, and relational schemas
Double-entry accounting ledgers with ACID row-level locking & zero double-spends
Demonstrated operational reliability across Render, Vercel, and Railway
Working understanding of Solidity, RPC node verification, Stellar & Base USDC rails
ENGINEERING PHILOSOPHY
Where Financial Accounting Rigor Meets High-Performance Backend Systems
Enterprise systems don’t fail on simple syntax—they fail when state transitions, race conditions, and balance invariants are left unmanaged. Treating every system with accounting precision ensures reliability at scale.
High-Throughput Node.js & TypeScript APIs
3+ years of production experience architecting modular RESTful and WebSocket backends with Express and TypeScript. Enforcing strict Zod validation contracts, dual-token JWT rotation, Redis caching, and robust error middleware.
ACID-Compliant Double-Entry Ledgers
Bridging a B.Sc. in Accounting with database transaction isolation. Designing append-only ledger tables in PostgreSQL with row-level locks (SELECT ... FOR UPDATE) to mathematically prevent race conditions, double-spending, and balance discrepancies.
Solidity Knowledge & Multi-Chain Settlement
Connecting centralized backend architectures with decentralized blockchain rails. Practical working knowledge of Solidity smart contracts, RPC node verification, and multi-chain stablecoin settlement across Stellar and Base L2.
FEATURED ARCHITECTURES
Production Backends & Distributed Systems
Verifiable production implementations from the LeviOnChain repository—from super-app commercial architectures and micro-USDC ledgers to voice AI bookkeeping and Redis-cached APIs.
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.
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.
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.
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.
TECHNICAL ARSENAL
Verified Technologies & Core Toolchain
A production-tested toolchain focused on Node.js and Python backend reliability, database transaction guarantees, and Web3 integration.
Backend Engineering & API Architecture
3+ years of production experience designing high-concurrency RESTful APIs, WebSocket protocols, and resilient microservices.
- Node.js & TypeScript EcosystemAdvanced
Express.js, strict TypeScript 5, Zod schema contracts, event emitters, WebSocket protocol integration, Knex.js, and modular domain architectures.
- Python (FastAPI & Django REST Framework)Proficient
FastAPI asynchronous microservices, Django REST Framework, Celery task scheduling, Pydantic validation, and ORM query optimization.
- RESTful API Design & Clean ArchitectureAdvanced
Multi-tiered domain services, input sanitization, centralized error handling middleware, rate limiting, and OpenAPI/Swagger contract generation.
- Authentication & Access Control (JWT/RBAC)Advanced
Dual-token JWT family rotation (short-lived access + sliding refresh), token blacklisting in Redis, and granular Role-Based Access Control.
- PHP & Enterprise CRM GatewaysProficient
PHP 8+ OOP, PSR-4, PDO prepared statements, OWASP security baseline enforcement, and Excel processing.
Databases, Caching & Financial Ledgers
Designing normalized schemas, relational integrity constraints, and sub-millisecond caching layers.
- PostgreSQL & SupabaseAdvanced
Complex joins, indexing strategies, Row-Level Security (RLS) policies, JSONB querying, database triggers, and transaction poolers.
- Redis 7 In-Memory CachingAdvanced
Sub-millisecond query caching, sliding token revocation lists, distributed locks, and pub/sub message brokering.
- Append-Only Double-Entry LedgersAdvanced
Designing auditable, sub-millisecond ledger tables that mirror accounting debits and credits with row-level locks (SELECT ... FOR UPDATE).
- MongoDB Atlas & NoSQLProficient
Document modeling, Mongoose aggregation pipelines, geospatial indexing, and real-time change streams for chat apps.
- MySQL & Relational DesignProficient
ACID transactional schemas, foreign-key cascade controls, and high-concurrency referral hierarchy trees.
Smart Contracts & Web3 Integration
Solid working understanding of EVM state machines and Solidity smart contracts, enabling seamless backend-to-blockchain bridges, RPC listening, and multi-chain settlement.
- Solidity & Smart Contract MechanicsProficient
Working knowledge of Solidity syntax, state variables, function modifiers, storage layout packing, custom errors, and escrow logic.
- Multi-Chain Stablecoin SettlementProficient
Architecting USDC deposit, escrow, and payout flows across Stellar (trustlines) and Base L2, integrated with Blink Merchant Gateway.
- RPC Node & On-Chain VerificationProficient
Direct zero-gas JSON-RPC verification of transaction receipts, event logs, and block confirmation depths before balance commitment.
- Hardhat & Foundry TestingWorking
Testing Solidity contracts against local simulated testnets, executing fork tests against live networks, and validating basic invariants.
Need a Smart Contract Developer or Systems Architect Who Understands Both Ledger Accounting & Solidity?
Whether you are building a decentralized protocol requiring rigorous invariant threat modeling, or architecting high-concurrency backend ledgers with sub-millisecond settlement, I am ready to deliver.