Joel O.

Full Stack Engineer

Full-time available

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Bio

Joel O is a highly skilled Full-Stack Software Engineer with over five years of experience building and maintaining scalable, production-grade web applications across fintech, health-tech, logistics, and Web3 domains. He specializes in modern frontend and backend development using Vue 3, Nuxt.js, React, Next.js 14, Node.js, NestJS, Express.js, and TypeScript, delivering responsive, high-performance user experiences backed by robust server-side architectures. On the backend, he is proficient with MongoDB, PostgreSQL, MySQL,…

  • Projects completed7
  • Hourly rate
  • 0-2 years experience
  • Member since Aug 2025
Expertise
Vue.JSNodeJSMongoDBGitJavascriptSQLCSSHTMLNextJSPythonReactTypescriptBashDatabase:DocumentDatabase:RelationalWebScrapingWordPress
Video Intro
Assessments

General Coding and Video assessment

Great score on JavaScript Mortgage Payment Calculator, Difficulty Medium · Great score on User Age Filtering Function, Difficulty Easy · Great score on Design a User Dashboard with Vue.js, Difficulty Medium · Great score on Benefits of Single File Components, Difficulty Hard

Projects

MedVax Telemedicine Platform

Engineered a full-stack telemedicine application using Vue 3 (frontend with Vite, Pinia state management, Tailwind CSS for responsive design) and Node.js/Express (backend with MongoDB/Mongoose for data persistence), integrating JWT authentication, Flutterwave payment processing, and AI chatbot for user interactions. Implemented secure user registration, appointment scheduling via Calendly, and medication catalog management with role-based access control (RBAC), enabling seamless virtual consultations and notifications via Twilio SMS/Nodemailer email, reducing administrative overhead by automating 80% of user communications. Optimized API endpoints for CRUD operations on user profiles and feedback, incorporating Winston/Morgan logging and Swagger documentation, resulting in a scalable platform compliant with health data privacy standards and supporting 1,000+ simulated patient interactions during development testing.

Polymarket Prediction Market Trading Bot

Developed an automated trading bot for Polymarket prediction markets, utilizing Node.js, Sentry and TypeScript to analyze market data, execute trades, and optimize strategies based on real-time probabilities and liquidity. Integrated with Polymarket APIs for seamless order placement, risk management, and performance tracking, enabling the client to run multiple iterations with configurable parameters for different market events. Managed full lifecycle from initial strategy prototyping to production monitoring, ensuring compliance with platform rules and secure API key handling. Delivered consistent profitability for the client, generating positive returns across all iterations while maintaining low-latency execution (<500ms per trade) and 99% uptime during high-volatility events, demonstrating expertise in algorithmic trading and Web3/DeFi automation.

Fintech Trading Dashboard

Developed a comprehensive full-stack fintech platform leveraging Next.js 14 with TypeScript (frontend featuring Zustand for global state, shadcn/ui components, and Framer Motion animations) and NestJS with MongoDB (backend for secure multi-currency trading, staking, and investments), including JWT authentication, 2FA via TOTP, and real-time currency conversion via ExchangeRate-API. Designed and integrated advanced features such as CFD/Forex/Crypto trading with leverage/TP-SL, copy trading, KYC document uploads with Multer validation, and admin approval workflows for deposits/withdrawals, enhancing user security and operational efficiency through rate limiting, Helmet headers, and scheduled cron jobs for ROI distributions. Built responsive dashboards for user balances, transaction history, and analytics with React Hook Form/Zod validation, achieving 95% Lighthouse performance scores and enabling admins to manage 500+ simulated trades, while ensuring XSS sanitization and input validation across all endpoints for robust fintech compliance.

CourierPro (Real-Time Tracking System)

Developed a production-ready full-stack logistics platform using Node.js/Express.js (backend for API routing and secure data handling), EJS templating with Tailwind CSS (frontend for responsive, futuristic UI with glassmorphism and animations), and MongoDB/Mongoose (database for package modeling and audit trails), incorporating Socket.io for real-time status updates. Implemented JWT authentication, rate limiting, input sanitization, and admin dashboard for comprehensive package CRUD operations, itemized tracking with image galleries/weights, and delivery history logging, streamlining operations for 500+ simulated shipments and reducing manual status checks by 50%. Enabled offline-first PWA functionality via service workers and manifest files, supporting mobile/desktop installations with dynamic milestone polling, achieving 98% uptime in testing and cross-browser compatibility for enhanced user engagement in high-volume delivery scenarios.

Corporate consulting platform for Better Organisations

Maintained design on client's HubSpot CMS with advanced workflows, lead capture, and SEO optimization. Designed a custom Business Website Template with an extensive custom design library for a new HubSpot marketplace theme.

Cron-JS Task Scheduler Library

Authored a lightweight, dependency-free cron job scheduler library for Node.js.

Web3 Farm Project

Designed Mobile UI for a web3 agri-tech solution on Figma.

Experience

  1. Full-Stack Software Engineer

    Lesous Technology LTDJan 2022 — Dec 2025
    • Led full-stack development of scalable web applications using Vue 3, Next.js 14, Node.js, and NestJS, including real-time features with Socket.io and Pusher.
    • Designed and implemented secure authentication systems using JWT, OAuth2, and two-factor authentication for fintech and health-tech platforms.
    • Architected backend systems with microservices patterns, Docker containerization, and CI/CD pipelines across Render, Vercel, and DigitalOcean.
    • Designed high-performance, responsive user interfaces using Tailwind CSS, shadcn/ui, Framer Motion, and modern UI animation systems.
    • Developed Web3 and blockchain-based integrations using Solidity, Wagmi, WalletConnect, and ethers.js across multiple chains.
    • Optimized application performance using MongoDB, PostgreSQL, Redis caching, and query optimization strategies.
    • Integrated payment gateways including Flutterwave, Stripe, and Bitnob for e-commerce and financial platforms.
    • Automated background workflows using cron jobs, Nodemailer, Twilio, and task scheduling systems.
    • Mentored junior developers through code reviews, technical guidance, and best practices in agile environments.
    • Owned project lifecycles from system design and API documentation to production deployment and monitoring.
    • Troubleshot and resolved production issues, maintaining high availability and uptime for user-facing systems.
    TypeScriptVue 3Nuxt.jsNext.js 14ReactNode.jsNestJSExpress.jsPostgreSQLRedisDockerCI/CD PipelinesCloudflareSolidityWagmiWalletConnectStripeFlutterwaveBitnobSocket.ioPusherJWTOAuth2GitHub ActionsNginxAgile / Scrum

  2. Junior Software Engineer

    Lesous Technology LTDJan 2020 — Dec 2021
    • Contributed to frontend development of web applications using Vue.js and basic React, translating Figma designs into responsive user interfaces.
    • Implemented RESTful API integrations and assisted in backend feature development using Node.js and Express.js.
    • Worked with MongoDB and MySQL to perform CRUD operations and support data modeling tasks.
    • Assisted in implementing authentication flows using JWT and basic role-based access control.
    • Fixed bugs, refactored legacy code, and improved application performance under senior developer guidance.
    • Collaborated in agile remote teams using Git and GitHub, participating in code reviews and sprint planning.
    • Assisted with deployment workflows on platforms like Vercel and Netlify.
    HTMLVanilla CSSJavaScriptVue.jsReact (basic)Node.jsExpress.jsMongoDBMySQLTailwind CSSGitGitHubPostmanFigmaRESTful APIs

  3. Head Of Proclaim Media

    Murphy Akpovi's Ministries (MAMS)Feb 2020 — Dec 2025
    • Directed end-to-end production of multi-platform live broadcasts using Open Broadcaster Software (OBS), Restream, and YouTube API integration.
    • Architected multi-camera video switching workflows with professional video cameras and hardware switchers for seamless SD|HD|4K streaming to 35,000+ concurrent viewers.
    • Developed and supervised custom automation scripts in Python, Node.js, JavaScript, and Bash scripting to streamline stream encoding, failover handling, and metadata injection.
    • Led design and implementation of on-screen graphics and lower-thirds using HTML, CSS, ProPresenter, FreeShow, and StageTimer.io for real-time lyric, scripture, and countdown displays.
    • Managed post-production pipelines with Adobe Premiere Pro, Adobe After Effects, Red Giant PluralEyes, Adobe Photoshop, Adobe Illustrator, and Photopea for video editing, motion graphics, and asset creation.
    • Supervised graphic design team in creating branded content using Canva and Figma for social media, flyers, and digital campaigns.
    • Coordinated virtual meetings and hybrid events via Zoom, Jitsi, and Cal.com for scheduling and remote collaboration.
    • Oversaw project management and team workflows using Notion, Trello, Miro.com, and Google Workspace for task tracking, brainstorming, and documentation.
    • Built and maintained internal tools with JavaScript and Node.js to automate volunteer scheduling, analytics dashboards, and donation tracking.
    PythonJavaScriptNode.jsOpen Broadcaster Software (OBS)RestreamYoutube APIHTMLCSSGoogle WorkspaceMiro.comTrelloProPresenterFreeShowStageTimer.ioBash scriptingCanvaAdobe Premier ProAdobe PhotoshopPhotopeaAdobe IllustratorAdobe After EffectsNotionFigmaRed Giant Plural EyesVideo SwitcherZoomJitsiCal.comVideo Cameras

  4. Public Speaker

    Murphy Akpovi's Ministries (MAMS)Jun 2025 — Jun 2025
    • Delivered keynote/session on leveraging technology for community transformation and faith-based digital outreach, sharing insights from building scalable ministry platforms and leading volunteer tech teams.
    • Delivered keynote/session on leveraging free and open source technology and artificial intelligence for business growth.
    Google WorkspaceProPresenter
Education

  1. Bachelor of Science (B.Sc)

    Delta State University, AbrakaDelta State, Nigeria2015 — 2021

  2. Software Engineering Certification

    ALX AfricaNigeria2021 — 2022
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