~/josephbuilds$whoami

Joseph Okolo

Backend Engineer · Fullstack (API Integration) · Web3 Specialist

open to collaborations

Backend Engineer with 4+ years building scalable, production-grade systems in TypeScript and NestJS. Core strength is backend: clean architecture, strong database design, and APIs teams can build on. Fullstack where it counts — at Syarpa and TamPay I integrated backend APIs into React and Next.js using TanStack Query for server state and end-to-end delivery.

Background spans data analysis, Web3 and blockchain development, and production backend engineering across fintech, real estate, and DeFi.

Building Celler at TamPay (contract). Previously Engineering Lead — Backend & Fullstack at Syarpa through March 2026 (Bloomvest V2).

github twitter linkedin email

~/josephbuilds$ls ./stack

Languages

TypeScript████████████████████████Primary

JavaScript████████████████████████Proficient

Go████████████████████████Working

Backend

NestJS████████████████████████Expert

Node.js████████████████████████Expert

GraphQL████████████████████████Advanced

REST APIs████████████████████████Expert

WebSockets████████████████████████Advanced

Web3 / Blockchain

Ethers.js████████████████████████Expert

Web3.js████████████████████████Advanced

Smart Contracts████████████████████████Advanced

DeFi dApps████████████████████████Advanced

NFT/DEX████████████████████████Advanced

Databases

PostgreSQL████████████████████████Expert

MongoDB████████████████████████Expert

Supabase████████████████████████Advanced

Frontend (API integration)

Next.js████████████████████████Advanced

React / Vite████████████████████████Advanced

TanStack Query████████████████████████Advanced

DevOps & Cloud

AWS████████████████████████Advanced

Docker████████████████████████Advanced

GitHub CI████████████████████████Working

~/josephbuilds$cat ./experience.log

01/TamPay·Fintechactive

Dec 2024 → Present

Backend & Fullstack Developer (Contract)

·Building Celler — a B2B fintech platform for buying & selling crypto and fiat
·Led full rewrite of Celler V2, migrating from Laravel (V1) to NestJS + PostgreSQL
·Designed scalable backend for multi-sided crypto/fiat marketplace with B2B flows
·Integrated backend APIs into React/Next.js frontend using TanStack Query
·Fine-tuned UI logic and validated API contracts end-to-end in production

02/Syarpa·Fintech

Sep 2025 → Mar 2026

Engineering Lead — Backend & Fullstack

·Led Bloomvest V2 launch end-to-end as Engineering Lead
·Migrated legacy SQL → PostgreSQL at scale
·Refactored Express.js → NestJS (modular, testable architecture)
·Designed APIs for investment flows, portfolios & financial transactions
·Implemented backend APIs into React/Next.js frontend using TanStack Query
·Worked closely with product and frontend teams to ship stable releases

03/RapidRocket Studio·Studio

Dec 2024 → Mar 2026

Backend Developer (Contract)

·Built 2 production projects using NestJS, Express.js, MySQL, Prisma & PostgreSQL
·Designed and delivered full backend systems from scratch per client specs

04/Fobework Studio·Studio

Jan 2025 → Jun 2025

Backend Developer

·Built Trilla — real estate platform with fractional ownership & fiat/crypto
·Built TriPay — QR/NFC scan-to-pay gateway with FX engine & merchant APIs
·Designed multi-role architectures: Users, Wallets, Transactions, Agents, Admins

05/Refine Studio·Web3

Sep 2023 → Nov 2024

Web3 Blockchain Developer

·Integrated Ethers.js and Web3.js across DeFi products — Curvance, Moziac, Pike, The Rollup
·Built smart contract integrations: reading state, listening to on-chain events, triggering txns
·Architected a high-performance blockchain indexer for Curvance (faster on-chain data retrieval)
·Built secure backend for The Rollup with MetaMask/email auth using GraphQL + Clerk
·Created Studio Attendance Bot in Go

06/DappLabs·Web3

Aug 2023 → Sep 2023

Fullstack Developer Intern

07/Self·Freelance

Apr 2022 → Present

Freelance Developer

·NFT marketplaces, DEXs, trading bots, mini Telegram apps
·Custom Web3 lottery apps, e-commerce APIs, blogging platforms

~/josephbuilds$ls ./projects --featured

#	project	description	stack	actions
01	🏦Bloomvest V2 Fintech investment & wealth platform NestJSPostgreSQLTanStack Query	Fintech investment & wealth platform	NestJSPostgreSQLTanStack Query	→
02	🏘️Trilla Real estate fractional ownership + fiat/crypto payments NestJSSupabaseNext.js	Real estate fractional ownership + fiat/crypto payments	NestJSSupabaseNext.js	→
03	💳TriPay Scan-to-pay gateway with FX engine & merchant APIs NestJSMongoDBWeb3	Scan-to-pay gateway with FX engine & merchant APIs	NestJSMongoDBWeb3	→
04	🎰CrossBet Microservices betting platform NestJSGraphQLWebSocketsDocker	Microservices betting platform	NestJSGraphQLWebSocketsDocker	→
05	⛓️Curvance Indexer High-performance blockchain data fetcher for DeFi Node.jsEthers.js	High-performance blockchain data fetcher for DeFi	Node.jsEthers.js	→
06	💬Chatter App Real-time messaging app NestJSGraphQLWebSocketsNext.js	Real-time messaging app	NestJSGraphQLWebSocketsNext.js	→
07	🖼️NFT Marketplace Full-featured NFT minting & trading platform ReactEthers.jsCrossFi	Full-featured NFT minting & trading platform	ReactEthers.jsCrossFi	→
08	🤖Studio Attendance Bot Automated attendance tracking for teams Go	Automated attendance tracking for teams	Go	→

~/josephbuilds$cat ./achievements.txt

🥇

Hackathon Winner

Wallet-based dApp, Web3 Hackathon

🏅

Judges' Pick

NFT Marketplace, Web3 Hackathon

🏆

4th Place

Wallet dApp category

🚀

Multi-chain DeFi

Delivered blockchain solutions across DeFi, fintech & real estate

⚙️

Engineering Lead

Promoted to lead backend architecture at a funded fintech

~/josephbuilds$cat ./education.md

B.Sc. Computer Science

Federal University of Petroleum Resources

2023

~/josephbuilds$./stats.sh

—

total contributions

last 365 days

—

longest streak

days

years experience

TypeScript · NestJS

10+

production systems

fintech · web3 · real estate

top languages

TypeScript

92%

JavaScript

CSS

Solidity

→ github.com/oojoseph67