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JM

Jonathan Mmadu

Open to work3 years experience

Full-Stack Engineer

NigeriaTarget Roles: Backend Engineer • Full-Stack Developer • Frontend Specialist

Full-Stack JavaScript Engineer | React, Next.js, Node.js, TypeScript, GraphQL, AI Dev

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Standing Rank

Rank Not Available

Developer Badges

Badges Pending

Skills & Technologies

42 skills
reactnext.jstypescriptjavascriptnode.jsgraphqlreact nativeexpohtml5css3rest apiscloudflare workersreact queryreduxpiniareact contextchakra uishadcn/uiheadless uimuiexpressdjangopythonmysqltailwind cssscssstyled componentsbemaws s3dockergithub actionsgitgithubagilescrumgithub copilotcursoropenai apiwoocommercewordpress rest apiga4core web vitals

GitHub Activity Evidence

GitHub Footprint Not Connected

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Work Experience

Full-Stack Developer

Hawkish Group

Feb 2025 - Feb 2026 Remote
  • Served as the primary technical owner for multiple product features — setting coding standards, defining component architecture, and making stack-level decisions that the broader team built on.
  • Designed and built REST APIs from scratch using Node.js/Express, applying OOP principles and consistent error-handling patterns to ensure reliability under production load.
  • Queried GraphQL APIs to integrate third-party services and surface structured data within React interfaces, reducing over-fetching and improving frontend data efficiency.
  • Architected MySQL database schemas for new product modules, defining table structures, relationships, and indexing strategies to support efficient querying at scale.
  • Refactored React state management and API data-fetching patterns using React Query, reducing redundant network calls and measurably improving load times on data-heavy interfaces.
  • Used AI-assisted development tools (GitHub Copilot, Cursor, OpenAI API) as active daily workflow practices — accelerating feature delivery, test scaffolding, and documentation generation.
  • Participated in peer code reviews, maintaining high-quality, scalable codebases and providing structured written feedback to teammates.

Frontend Developer

Dosh Services

Jan 2024 - Dec 2024 Remote
  • Engineered dynamic React and Next.js interfaces integrated with backend REST and GraphQL APIs, enabling efficient data flow and seamless user experiences.
  • Built accessible, reusable UI components using Chakra UI and Headless UI — maintaining consistent design patterns across the product and collaborating closely with designers on component behaviour.
  • Refactored legacy codebases using Tailwind CSS and SCSS, significantly improving Core Web Vitals and Lighthouse performance scores across mobile and desktop.
  • Communicated progress, technical risks, and implementation tradeoffs clearly with project managers and designers throughout the agile delivery cycle.

Freelance Fullstack Developer

Independent / Client Projects

Dec 2022 - Dec 2023 Remote
  • Composable Commerce: Architected and delivered a complete full-stack e-commerce platform using a composable, headless approach — MySQL schema, Node.js/Express REST API with JWT auth, AWS S3 for assets, and React/Redux frontend — from brief to production.
  • React Native & Expo: Developed cross-platform mobile applications using React Native with Expo managed workflow — building consistent, performant interfaces across iOS and Android with network-resilient data loading strategies.
  • Headless Architecture: Engineered a decoupled Next.js frontend consuming the WordPress REST API as a headless CMS backend, with SSR/SSG strategies for SEO performance and clean separation of content and presentation.
  • GraphQL Integration: Queried GraphQL APIs to consume structured data from third-party platforms within React applications, handling authentication, pagination, and error states throughout.
  • AI-Assisted Delivery: Used GitHub Copilot, Cursor, and the OpenAI API to automate repetitive tasks, accelerate feature development, and explore new solutions — applying responsible judgement about when and how to use AI tooling.
  • SEO & Analytics: Implemented on-page SEO (meta tags, Open Graph, semantic HTML) and GA4 tracking integration across client websites to support performance monitoring.

Projects

Fullstack E-Commerce Platform

ReactReduxNode.jsExpressMySQLGraphQLAWS S3JWT
  • Designed a normalised MySQL schema covering products, orders, users, cart, and inventory with indexing strategies for performant querying at scale.
  • Built a Node.js/Express REST API with JWT auth, role-based access, input validation, and AWS S3 for product asset management. Integrated GraphQL API queries for third-party product data.
  • Developed the React/Redux frontend with Chakra UI components, GA4 tracking, and production-grade error handling — fully responsive across all device sizes.

OWASP BLT-Rewards — Secure Automation Pipeline

DjangoPythonGitHub WebhooksCloudflare WorkersHTMX
  • Independently designed a secure server-to-server automation pipeline — researched, proposed, and delivered with no prior codebase context, demonstrating initiative and autonomous technical ownership.
  • Authored a 25-page technical proposal covering system architecture, database schemas, API design, and security strategy — delivered independently as a clear written communication artefact.

Leaderboard Standings

Leaderboard Position Pending

Global test scores, peer standing percentiles, and algorithm leaderboard ranks are updated dynamically.

Assessment Highlights

Assessments Not Completed

Coding evaluations, system assessment results, and conceptual score badges will appear here after taking a test.

AI Collaboration Score

AI Collaboration Score Pending

Developer coding behavior, assistant cooperation, and AI pair-programming indicators are evaluated during live coding sessions.

Role Compatibility Profile

Role Compatibility Analysis Pending

Custom matching reports, candidate role compatibility percentiles, and core engineer strength profiles are processed once conceptual code screenings are complete.

Achievements

Technical Proposal for OWASP BLT-Rewards

Authored a 25-page technical proposal covering system architecture, database schemas, API design, and security strategy for OWASP BLT-Rewards.

About Details

Professional Bio

Full-Stack JavaScript Engineer with 3+ years of commercial experience building modern web and mobile solutions. Experienced in composable, headless architectures, e-commerce platform delivery, and AI-assisted development workflows. Proven track record of technical ownership on client projects.

Full-Stack Development in Full-Stack Development

Zuri & Ingressive4Good (2022 - 2022)

Languages: English, Hindi
Email: Locked
Jonathan Mmadu - Profile | Swiftcruit