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johndiddles logo

Hi there I'm John

A Full Stack Engineer

Objective

Results-driven Full Stack Engineer with hands-on experience designing and scaling web and mobile applications using JavaScript, TypeScript, React, Next.js, Node.js, and AWS. Proven success implementing Stripe-based subscription systems, automating onboarding workflows, and developing cloud-native microservices to enhance performance and user autonomy. Adept at delivering fast, reliable, and user-centered solutions that drive growth and innovation in dynamic startup environments.


Skills

HTML CSS JavaScript TypeScript Python Java React Next.js React Native Sass Tailwind Node.js Express NestJS Git AWS Redux Redux Toolkit Zustand REST GraphQL MongoDB PostgreSQL DynamoDB Docker Kubernetes SEO Sanity (CMS)


Professional Experience

Mobile Engineer (Contract)

Paybyleap — Delaware, USA January 2025 – Present

  • Engineered a cross-platform fintech mobile application using React Native, Expo, and TypeScript, transitioning the product from initial concept to TestFlight beta for soft launch.
  • Designed and implemented secure authentication workflows, including biometric integration (Face ID, fingerprint) and PIN-based login, to enhance account security.
  • Developed comprehensive wallet and payment systems to support fund transfers and automated settlements for school, visa, SEVIS, and WES fees.
  • Integrated automated receipt generation and downloadable proof-of-payment features, improving transaction transparency.

Full Stack Engineer

Evon Medics LLC — Maryland, USA August 2023 – April 2026

  • Led the software development team through the Phase II development of the "Editor Current" project, delivering an improved cloud portal experience for clinical trials managers.
  • Led a team of internal and external software developers and UI/UX designers to build "Editor RPM" – a remote physiological monitoring tool.
  • Enhanced scalability of cloud portal authentication workflows, enabling seamless Stage 2 clinical trials for the "Editor Current" project.
  • Automated recovery of 6,000+ patient data points, securing a $2.8M research grant by ensuring data integrity.
  • Developed "Directions Driving Test" backend with Node.js, TypeScript, and Stripe, streamlining licensing and subscription management.
  • Built Editor RPM mobile app using React Native and Zustand, improving patient monitoring efficiency.
  • Engineered microservice for AI-driven pupil dilation analysis using Python and FastAPI, integrating with MongoDB for data storage.
  • Rebuilt and maintained Editor Current cloud portal using Next.js, Lambda, Cognito, DynamoDB, and other AWS services.

Full Stack Engineer

Do Me A Solid — Delaware, USA August 2025 – November 2025

  • Implemented a subscription-based billing system using Stripe, enabling the company's first fully automated sale without manual intervention.
  • Built and optimized the onboarding workflow, reducing account creation time to under one minute and giving users full self-service control.
  • Implemented a user referral system that rewards users with in-system points for successful referrals.
  • Improved SEO leveraging tools like Google Search Console, PageSpeed Insights, Lighthouse, and ARC Toolkit.

Software Developer

Broadshift Technologies — Lagos, Nigeria November 2022 – August 2023

  • Led the transition of the company's admin panel from PHP to React-TypeScript, resulting in improved support ticket resolution time and a better user experience.
  • Developed a shift management system to optimize staff scheduling, automate report generation, and reduce reliance on third-party services.
  • Provided technical leadership to the frontend development team.
  • Conducted frontend code reviews and refactored frontend codebases to improve performance, scalability, and readability.
  • Provided technical support to the company's API agents.

Frontend Developer

Arkbridge Integrated Limited — Lagos, Nigeria February 2022 – November 2022

  • Delivered pixel-perfect UIs for the company's website and web applications using React, Redux, and TypeScript.
  • Refactored and restructured the codebase to improve the scalability of the company's projects.
  • Built websites for company events and attendee registrations using WordPress.

Frontend Developer Intern

HNG Internship — Lagos, Nigeria August 2021 – October 2021

  • Executed pixel-perfect design for the Zuri Chat Company files plugin pages.
  • Implemented file/folder access management to restrict and grant access to users depending on their access levels.
  • Collaborated with team members to convert plugins built with ReactJS to a Single SPA-compatible microservice.

Education

Bachelor of Science in Accounting University of Lagos — Lagos, Nigeria November 2024


Certifications

Certification Issuer Year
Kubernetes and Cloud Native Essentials The Linux Foundation 2026
Docker and Kubernetes HNG Tech Limited 2024
JavaScript Algorithms and Data Structures freeCodeCamp 2022
Frontend Web UI Frameworks and Tools The Hong Kong University of Science and Technology (Coursera) 2020

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