~/josephbuilds$whoami

Joseph Okolo

Backend Engineer · Web3 Specialist · Engineering Lead

available for work

Backend Engineer with 4+ years building scalable, production-grade systems in TypeScript and NestJS. I lead with clean architecture: modular design, strong database foundations, and APIs that teams can reliably build on top of.

Across fintech, Web3, and real estate, I've taken ownership of full backend lifecycles — migrating legacy codebases, architecting crypto payment gateways, and leading engineering teams from ideation to production.

Currently Engineering Lead at Syarpa and contracted backend developer at TamPay and RapidRocket Studio.

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~/josephbuilds$ls ./stack
Languages
TypeScript████████████████████████Primary
JavaScript████████████████████████Proficient
Go████████████████████████Working
Backend
NestJS████████████████████████Expert
Node.js████████████████████████Expert
GraphQL████████████████████████Advanced
REST APIs████████████████████████Expert
WebSockets████████████████████████Advanced
Web3 / Blockchain
Ethers.js████████████████████████Expert
Web3.js████████████████████████Advanced
DeFi dApps████████████████████████Advanced
NFT/DEX████████████████████████Advanced
Solana SDK████████████████████████Familiar
Databases
PostgreSQL████████████████████████Expert
MongoDB████████████████████████Expert
Supabase████████████████████████Advanced
Frontend
Next.js████████████████████████Advanced
React████████████████████████Advanced
DevOps & Cloud
AWS████████████████████████Advanced
Docker████████████████████████Advanced
GitHub CI████████████████████████Working
~/josephbuilds$cat ./experience.log
01/TamPay·Fintechactive
Dec 2025 → Present
Backend 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 architecture for multi-sided marketplace with crypto/fiat flows
  • ·Improved performance, maintainability, and extensibility over the legacy PHP codebase
02/RapidRocket Studio·Studioactive
Dec 2025 → Present
Backend Developer (Contract)
  • ·Contracted as backend developer for client projects across the studio
  • ·Built 2 production projects using NestJS, Express.js, MySQL, Prisma & PostgreSQL
  • ·Designed and delivered full backend systems from scratch per client specs
03/Syarpa·Fintechactive
Sep 2025 → Present
Engineering Lead (Backend)
  • ·Led Bloomvest V2 launch end-to-end
  • ·Migrated legacy SQL → PostgreSQL at scale
  • ·Refactored Express.js → NestJS (modular, testable architecture)
  • ·Designed APIs for investment flows, portfolios & financial transactions
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
  • ·Developed DeFi products — Curvance, Moziac, Pike, The Rollup
  • ·Built a high-performance blockchain indexer for Curvance
  • ·Implemented MetaMask + email auth backend 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$ls ./projects --featured
#project
01
🏦Bloomvest V2
Fintech investment & wealth platform
NestJSPostgreSQL
02
🏘️Trilla
Real estate fractional ownership + fiat/crypto payments
NestJSSupabaseNext.js
03
💳TriPay
Scan-to-pay gateway with FX engine & merchant APIs
NestJSMongoDBWeb3
04
🎰CrossBet
Microservices betting platform
NestJSGraphQLWebSocketsDocker
05
⛓️Curvance Indexer
High-performance blockchain data fetcher for DeFi
Node.jsEthers.js
06
💬Chatter App
Real-time messaging app
NestJSGraphQLWebSocketsNext.js
07
🖼️NFT Marketplace
Full-featured NFT minting & trading platform
ReactEthers.jsCrossFi
08
🤖Studio Attendance Bot
Automated attendance tracking for teams
Go
~/josephbuilds$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
4+
years experience
TypeScript · NestJS
10+
production systems
fintech · web3 · real estate
top languages
TypeScript
92%
JavaScript
6%
CSS
1%
Solidity
1%
→ github.com/oojoseph67