Joel Emmanuel
Fullstack & Blockchain Developer
ejoel0035@gmail.comjoelemmanuel.devlinkedin.com/in/joel-emmanuel-149708202github.com/joelemmanuelNigeria
Fullstack & Blockchain Developer with 3+ years building scalable Web3 applications, AI-powered platforms, and production systems across international teams in Brazil, USA, Canada, Nigeria, and Ghana. Experienced with Lisk, Ethereum, React, NestJS, Spring Boot, and AWS. AWS Certified Cloud Practitioner and AI Practitioner.
Skills
Frontend:React.js · Next.js · TypeScript · React Native · Tailwind CSS
Backend:NestJS · Node.js · Spring Boot · Python · REST APIs · GraphQL
Blockchain:Ethereum · Solidity · Lisk Blockchain · Smart Contracts · Web3.js · 0G Storage/Compute · Gensyn AXL · ENS EIP-3668 · ERC-7857
Cloud & AI:AWS (EC2, S3, Lambda, Bedrock, SageMaker) · Docker · CI/CD · LangChain · RAG Systems
Databases:PostgreSQL · MongoDB · Redis · MySQL · Vector Databases
Prod. Eng.:Prometheus · Grafana · k6 Load Testing · Nginx · Incident Runbooks · Horizontal Scaling
Experience
Fullstack Developer — Learnway
Dec 2024 – Present
Remote
- •Building full-stack platform for Learnway blockchain education app on Lisk blockchain
- •Implementing scalable NestJS APIs for progress tracking and reward distribution
- •Integrating Lisk smart contracts for token-based educational rewards
- •Building gamification features including leaderboards and achievement systems
Front-End Developer — Invillia
Apr 2025 – Mar 2026
Brazil (Remote)
- •Transitioned from Front-end QA to Developer within the same engagement
- •Built UI features with React 18, TypeScript, and TanStack Table
- •Integrated REST APIs with Keycloak SSO authentication and Zod validation
- •Wrote Cypress E2E and Jest unit tests improving overall test coverage
Frontend Developer — Vivo
2024 – 2025
Brazil (Remote)
- •Developed React frontend for Vivo B2B fixed-sales e-commerce platform
- •Implemented Framework Brasil design system components and guidelines
- •Integrated with Node.js BFF and Java microservices decoupling layer
- •Part of new squad ramp-up for Vivo's B2B e-commerce expansion
Full-stack Developer — Freedom Ghana
2023 – Dec 2024
Ghana (Remote)
- •Built comprehensive ride-hailing platform with React and Node.js serving thousands of daily requests
- •Architected real-time ride matching with Socket.IO and Google Maps API
- •Deployed scalable AWS infrastructure with automated CI/CD pipelines
- •Reduced average wait times by 45% through optimized driver-passenger matching
Full Stack and AI/ML Developer — Compass UOL
Feb 2023 – Present
Brazil (Remote)
- •Developed e-commerce and enterprise applications with React, Spring Boot, and modern tech stack
- •Architected AI/ML solutions using AWS services including SageMaker and Bedrock
- •Built RAG system for Universidade de São Paulo with LangChain and vector databases
- •Optimized API performance achieving 35% improvement through caching and query tuning
Backend Developer — Rewod Technologies
Oct 2022 – Mar 2023
Nigeria
- •Developed internal tools using Python and Java Spring Boot
- •Created data processing pipelines handling millions of records daily
- •Gained valuable full-stack development experience
Hackathons
ETHGlobal Open Agents – Ghent — Lead Developer
May 2026- •Architected four Gensyn AXL nodes (Witness, Verifier, Propagator, Memory) communicating over a P2P Yggdrasil mesh with no central coordinator
- •Stored agent decision attestations on 0G Storage with real merkle rootHashes; 5-rule mandate engine verdict notarized via 0G Compute TEE
- •Deployed AegisCourt.sol and AgentRegistry.sol (ERC-7857 iNFT) on 0G testnet; KeeperHub fires remedy workflows automatically on every verdict
- •ENS *.aegis.eth subnames with live reputation readable from Ethereum via EIP-3668 CCIP-read — no bridge required
- •Live production deployment at app.aegisprotocol.uk; drop-in SDK for LangChain, LangGraph, CrewAI, AutoGen, and ElizaOS
MLH Production Engineering Hackfest 2026 — Production Engineer
April 2026- •Deployed 2 Flask instances behind Nginx on DigitalOcean with Docker Compose
- •Implemented Redis caching on redirect and list endpoints, reducing error rate by 24% under 200 concurrent users
- •Instrumented with Prometheus metrics and Grafana dashboards for real-time observability
- •Load tested with k6 at 200 VUs, documented bottleneck analysis and before/after results
- •Wrote failure mode documentation, runbook, and CI/CD pipeline with GitHub Actions
EthGlobal Unite DeFi Hackathon — Blockchain Developer
July 25 – August 8, 2025- •Built cross-chain DeFi solutions competing for $525,000 in bounties
- •Collaborated with 1inch development team on multi-chain applications
- •Implemented smart contract integrations aggregating liquidity across networks
- •Designed unified dApp interfaces for seamless cross-chain experiences
EthGlobal x Avail: Building Unchained Apps — Web3 Developer
October 10 – 31, 2025- •Developed cross-chain apps with Avail Nexus SDK for asset transfer without bridges
- •Built DeFi payment solutions with Bridge & Execute and cross-chain swap features
- •Architected intent systems for adaptive yield routing across chains
- •Delivered technical documentation showcasing real-world cross-chain flows
Certifications
AWS Certified Cloud Practitioner — Amazon Web Services
Oct 2023 – Oct 2026AWS Certified AI Practitioner — Amazon Web Services
2024Huawei Certified Network Associate (HCNA) — Huawei
2023