Joseph oojoseph67

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Joseph Okolo

Backend Engineer · Fullstack (API Integration) · Web3 Specialist

`> whoami`

Backend Engineer with 4+ years building scalable, production-grade systems in TypeScript and NestJS. My core strength is backend: clean architecture, strong database design, and APIs that teams can reliably build on. I also bring practical fullstack experience — at both Syarpa and TamPay, I worked across the stack to integrate backend APIs directly into React and Next.js frontends using TanStack Query to manage server state and ensure smooth end-to-end functionality. My background spans data analysis, Web3 and blockchain development, and production backend engineering across fintech, real estate, and DeFi.

`> 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 Contr ████████████  Advanced
DeFi dApps  ████████░░░░  Advanced
NFT/DEX     ████████░░░░  Advanced

Databases

PostgreSQL  ████████████
MongoDB     ████████████
Supabase    ████████░░░░

Frontend (API Integration)

Next.js       ████████░░░░
React / Vite  ████████░░░░
TanStack Q    ████████░░░░

DevOps & Cloud

AWS         ████████░░░░
Docker      ████████░░░░
GitHub CI   ██████░░░░░░

`> cat ./experience.log`

- role: Backend & Fullstack Developer (Contract)
  company: TamPay · Fintech
  period: Dec 2024 → Present
  highlights:
    - 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

- role: Engineering Lead — Backend & Fullstack
  company: Syarpa · Fintech
  period: Sep 2025 → Mar 2026
  highlights:
    - 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

- role: Backend Developer (Contract)
  company: RapidRocket Studio
  period: Dec 2024 → Mar 2026
  highlights:
    - Built 2 production projects using NestJS, Express.js, MySQL, Prisma & PostgreSQL
    - Designed and delivered full backend systems from scratch per client specs

- role: Backend Developer
  company: Fobework Studio
  period: Jan 2025 → Jun 2025
  highlights:
    - 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

- role: Web3 Blockchain Developer
  company: Refine Studio
  period: Sep 2023 → Nov 2024
  highlights:
    - 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

- role: Fullstack Developer Intern
  company: DappLabs
  period: Aug 2023 → Sep 2023

- role: Freelance Developer
  company: Self
  period: Apr 2022 → Present
  highlights:
    - NFT marketplaces, DEXs, trading bots, mini Telegram apps
    - Custom Web3 lottery apps, e-commerce APIs, blogging platforms

`> ls ./projects --featured`

Project	Description	Stack
🏦 Bloomvest V2	Fintech investment & wealth platform	`NestJS` `PostgreSQL` `TanStack Query`
🏘️ Trilla	Real estate fractional ownership + fiat/crypto payments	`NestJS` `Supabase` `Next.js`
💳 TriPay	Scan-to-pay gateway with FX engine & merchant APIs	`NestJS` `MongoDB` `Web3`
🎰 CrossBet	Microservices betting platform	`NestJS` `GraphQL` `WebSockets` `Docker`
⛓️ Curvance Indexer	High-performance blockchain data fetcher for DeFi	`Node.js` `Ethers.js`
💬 Chatter App	Real-time messaging app	`NestJS` `GraphQL` `WebSockets` `Next.js`
🖼️ NFT Marketplace	Full-featured NFT minting & trading platform	`React` `Ethers.js` `CrossFi`
🤖 Studio Attendance Bot	Automated attendance tracking for teams	`Go`

`> 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

`> ./stats.sh`

`> cat ./education.md`

B.Sc. Computer Science — Federal University of Petroleum Resources, 2023

Backend-first. Fullstack when it counts. Web3 when it's on-chain.

Open to collaborating on ambitious backend & Web3 projects.

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