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Johnnie

@johnnier3

monthly-level-four.svgverified-v3.svgpreferred-freelancer-v3.svg
5.0
21

7.4

7.4

95%

Full-Stack Web & Mobile | AI & Automation Expert

$70 USD / Hour

・

Flag of UNITED STATES

United States (8:19 AM)

・

Joined on July 2, 2025

・

1 Recommendation

$70 USD / Hour

・

Hi, I'm Johnnie Reece, a Preferred Freelancer and senior full-stack engineer. For 10+ years I've shipped web, mobile, and emerging tech for startups and Fortune 500 companies, on time and without surprises. What I build: - Pixel-perfect web and mobile apps (React, Next.js, React Native, Flutter) scoring 98-100 on Lighthouse - Secure, scalable backends in Node.js/NestJS, Java/Spring Boot, .NET, and Python - High-performance Shopify and WordPress stores, custom apps, and headless setups - Blockchain dApps, smart contracts, and Web3 integrations - Automation bots, scrapers, and AI workflows - AWS infrastructure with 99.99%+ uptime and auto-scaling How I work: Daily updates, live demos, direct access (no middlemen). I act as your technical partner, flagging risks early and writing clean, documented code built to last. Clients come back because I ship faster, cleaner, and more reliably. Ready to start? Message me. I reply fast and can begin immediately.

Verifications

On time

99%

On budget

99%

Accept rate

68%

Repeat hire rate

9%

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Portfolio

Portfolio

13940148
Built an AI-powered excavators listing SaaS application using modern technologies: Next.js, TypeScript, Supabase, OpenAI API, Tailwind CSS, Vercel, etc.

Programmatic SEO + AI Content

13856845
- Built responsive mobile app screens using React Native and TypeScript - Developed backend systems to support the UI - Set up automated CI/CD for App Store and Play Store deployments - Published apps on both stores - Wrote manual documentation - Maintained and updated the app based on customer feedback

React Native Mobile App Development

13847935
https://apps.apple.com/us/app/assymbly-local-sports-leagues/id6444143481 https://play.google.com/store/apps/details?id=com.assymbly As a React Native developer, I built Assembly, a sleek mobile app that helps users discover local sports leagues, pickup games, and tournaments near them. The app features an interactive map with custom sport-specific pins, advanced filters for sports, days, gender, and event types, and a clean, modern UI that delivers a smooth experience on both iOS and Android.

Mobile Application Development

13637795
As lead Shopify developer for Giovvani, Italy's top luxury shoe retailer, I drove the platform's development and optimization into a high-performance sales engine. Key contributions: - Theme & UI/UX: Customized Liquid themes with JS/CSS on Dawn framework for a minimalist look, creating responsive product pages that cut bounce rates by 25%. - SEO & Performance: Added schema, meta tags, and speed tweaks (under 2s loads), lifting organic traffic 40% and hitting 98% uptime. - App Integrations: Rolled out 15+ apps like Klaviyo and ReCharge for emails, subs, and reviews, boosting conversions 18% via custom scripts. - Payments & Compliance: Set up multi-currency Stripe/PayPal with GDPR tools, crafting secure checkouts for €500+ items to slash abandonments. - Analytics & Launches: Integrated GA4 for KPI tracking and A/B tests, raising repeat sales 15%; collaborated on Git-deployed seasonal drops. My efforts scaled Giovvani to €2M+ revenue, merging tech with luxury flair—

Luxury Shoes Store Development

As lead Shopify developer for Giovvani, Italy's top luxury shoe retailer, I drove the platform's development and optimization into a high-performance sales engine. Key contributions: - Theme & UI/UX: Customized Liquid themes with JS/CSS on Dawn framework for a minimalist look, creating responsive product pages that cut bounce rates by 25%. - SEO & Performance: Added schema, meta tags, and speed tweaks (under 2s loads), lifting organic traffic 40% and hitting 98% uptime. - App Integrations: Rolled out 15+ apps like Klaviyo and ReCharge for emails, subs, and reviews, boosting conversions 18% via custom scripts. - Payments & Compliance: Set up multi-currency Stripe/PayPal with GDPR tools, crafting secure checkouts for €500+ items to slash abandonments. - Analytics & Launches: Integrated GA4 for KPI tracking and A/B tests, raising repeat sales 15%; collaborated on Git-deployed seasonal drops. My efforts scaled Giovvani to €2M+ revenue, merging tech with luxury flair—

Luxury Shoes Store Development

As lead Shopify developer for Giovvani, Italy's top luxury shoe retailer, I drove the platform's development and optimization into a high-performance sales engine. Key contributions: - Theme & UI/UX: Customized Liquid themes with JS/CSS on Dawn framework for a minimalist look, creating responsive product pages that cut bounce rates by 25%. - SEO & Performance: Added schema, meta tags, and speed tweaks (under 2s loads), lifting organic traffic 40% and hitting 98% uptime. - App Integrations: Rolled out 15+ apps like Klaviyo and ReCharge for emails, subs, and reviews, boosting conversions 18% via custom scripts. - Payments & Compliance: Set up multi-currency Stripe/PayPal with GDPR tools, crafting secure checkouts for €500+ items to slash abandonments. - Analytics & Launches: Integrated GA4 for KPI tracking and A/B tests, raising repeat sales 15%; collaborated on Git-deployed seasonal drops. My efforts scaled Giovvani to €2M+ revenue, merging tech with luxury flair—

Luxury Shoes Store Development

13381358
- Frontend development using React, Next.js and Styled-components ensuring flexible, user-friendly user interfaces - Backend or server-side development using Node.js ...

Fullstack development

- Frontend development using React, Next.js and Styled-components ensuring flexible, user-friendly user interfaces - Backend or server-side development using Node.js ...

Fullstack development

- Frontend development using React, Next.js and Styled-components ensuring flexible, user-friendly user interfaces - Backend or server-side development using Node.js ...

Fullstack development

13380883
Key Responsibilities - UI/UX implementation: Translated Figma designs into pixel-perfect and responsive user interfaces that align with Zego’s brand and user experience standards. - Optimize performance: Implemented web performance optimization techniques, such as server-side rendering, static site generation, lazy loading, and asset bundling, to ensure fast load times and smooth user interactions. ...

Frontend Engineer- Next + Tailwind

Key Responsibilities - UI/UX implementation: Translated Figma designs into pixel-perfect and responsive user interfaces that align with Zego’s brand and user experience standards. - Optimize performance: Implemented web performance optimization techniques, such as server-side rendering, static site generation, lazy loading, and asset bundling, to ensure fast load times and smooth user interactions. ...

Frontend Engineer- Next + Tailwind

Key Responsibilities - UI/UX implementation: Translated Figma designs into pixel-perfect and responsive user interfaces that align with Zego’s brand and user experience standards. - Optimize performance: Implemented web performance optimization techniques, such as server-side rendering, static site generation, lazy loading, and asset bundling, to ensure fast load times and smooth user interactions. ...

Frontend Engineer- Next + Tailwind

13940148
Built an AI-powered excavators listing SaaS application using modern technologies: Next.js, TypeScript, Supabase, OpenAI API, Tailwind CSS, Vercel, etc.

Programmatic SEO + AI Content

13856845
- Built responsive mobile app screens using React Native and TypeScript - Developed backend systems to support the UI - Set up automated CI/CD for App Store and Play Store deployments - Published apps on both stores - Wrote manual documentation - Maintained and updated the app based on customer feedback

React Native Mobile App Development

13847935
https://apps.apple.com/us/app/assymbly-local-sports-leagues/id6444143481 https://play.google.com/store/apps/details?id=com.assymbly As a React Native developer, I built Assembly, a sleek mobile app that helps users discover local sports leagues, pickup games, and tournaments near them. The app features an interactive map with custom sport-specific pins, advanced filters for sports, days, gender, and event types, and a clean, modern UI that delivers a smooth experience on both iOS and Android.

Mobile Application Development

13637795
As lead Shopify developer for Giovvani, Italy's top luxury shoe retailer, I drove the platform's development and optimization into a high-performance sales engine. Key contributions: - Theme & UI/UX: Customized Liquid themes with JS/CSS on Dawn framework for a minimalist look, creating responsive product pages that cut bounce rates by 25%. - SEO & Performance: Added schema, meta tags, and speed tweaks (under 2s loads), lifting organic traffic 40% and hitting 98% uptime. - App Integrations: Rolled out 15+ apps like Klaviyo and ReCharge for emails, subs, and reviews, boosting conversions 18% via custom scripts. - Payments & Compliance: Set up multi-currency Stripe/PayPal with GDPR tools, crafting secure checkouts for €500+ items to slash abandonments. - Analytics & Launches: Integrated GA4 for KPI tracking and A/B tests, raising repeat sales 15%; collaborated on Git-deployed seasonal drops. My efforts scaled Giovvani to €2M+ revenue, merging tech with luxury flair—

Luxury Shoes Store Development

As lead Shopify developer for Giovvani, Italy's top luxury shoe retailer, I drove the platform's development and optimization into a high-performance sales engine. Key contributions: - Theme & UI/UX: Customized Liquid themes with JS/CSS on Dawn framework for a minimalist look, creating responsive product pages that cut bounce rates by 25%. - SEO & Performance: Added schema, meta tags, and speed tweaks (under 2s loads), lifting organic traffic 40% and hitting 98% uptime. - App Integrations: Rolled out 15+ apps like Klaviyo and ReCharge for emails, subs, and reviews, boosting conversions 18% via custom scripts. - Payments & Compliance: Set up multi-currency Stripe/PayPal with GDPR tools, crafting secure checkouts for €500+ items to slash abandonments. - Analytics & Launches: Integrated GA4 for KPI tracking and A/B tests, raising repeat sales 15%; collaborated on Git-deployed seasonal drops. My efforts scaled Giovvani to €2M+ revenue, merging tech with luxury flair—

Luxury Shoes Store Development

As lead Shopify developer for Giovvani, Italy's top luxury shoe retailer, I drove the platform's development and optimization into a high-performance sales engine. Key contributions: - Theme & UI/UX: Customized Liquid themes with JS/CSS on Dawn framework for a minimalist look, creating responsive product pages that cut bounce rates by 25%. - SEO & Performance: Added schema, meta tags, and speed tweaks (under 2s loads), lifting organic traffic 40% and hitting 98% uptime. - App Integrations: Rolled out 15+ apps like Klaviyo and ReCharge for emails, subs, and reviews, boosting conversions 18% via custom scripts. - Payments & Compliance: Set up multi-currency Stripe/PayPal with GDPR tools, crafting secure checkouts for €500+ items to slash abandonments. - Analytics & Launches: Integrated GA4 for KPI tracking and A/B tests, raising repeat sales 15%; collaborated on Git-deployed seasonal drops. My efforts scaled Giovvani to €2M+ revenue, merging tech with luxury flair—

Luxury Shoes Store Development

13381358
- Frontend development using React, Next.js and Styled-components ensuring flexible, user-friendly user interfaces - Backend or server-side development using Node.js ...

Fullstack development

- Frontend development using React, Next.js and Styled-components ensuring flexible, user-friendly user interfaces - Backend or server-side development using Node.js ...

Fullstack development

- Frontend development using React, Next.js and Styled-components ensuring flexible, user-friendly user interfaces - Backend or server-side development using Node.js ...

Fullstack development

13380883
Key Responsibilities - UI/UX implementation: Translated Figma designs into pixel-perfect and responsive user interfaces that align with Zego’s brand and user experience standards. - Optimize performance: Implemented web performance optimization techniques, such as server-side rendering, static site generation, lazy loading, and asset bundling, to ensure fast load times and smooth user interactions. ...

Frontend Engineer- Next + Tailwind

Key Responsibilities - UI/UX implementation: Translated Figma designs into pixel-perfect and responsive user interfaces that align with Zego’s brand and user experience standards. - Optimize performance: Implemented web performance optimization techniques, such as server-side rendering, static site generation, lazy loading, and asset bundling, to ensure fast load times and smooth user interactions. ...

Frontend Engineer- Next + Tailwind

Key Responsibilities - UI/UX implementation: Translated Figma designs into pixel-perfect and responsive user interfaces that align with Zego’s brand and user experience standards. - Optimize performance: Implemented web performance optimization techniques, such as server-side rendering, static site generation, lazy loading, and asset bundling, to ensure fast load times and smooth user interactions. ...

Frontend Engineer- Next + Tailwind

5.0 · 21 Reviews
21 Reviews
User Avatar
Flag of ITALY

Mauro

5.0

€3,500 EUR

3 days ago

Angular Developer for KAIZENCHECK Software Enhancement

Ottimo lavoro!! Johnnie ha concluso il lavoro prima del termine prestabilito dimostrando grande competenza e professionalità. Lo consiglio a tutti!!

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E
Flag of UNITED STATES

Marc

5.0

$9,100 USD

2 months ago

Author & Guru Digital Hub

Johnny knows exactly what he's doing, is super professional, is really friendly to work with, and most of all has delivered exactly what I wanted. Thanks a million!

PHP
Website Design
Graphic Design
HTML
Web Development

+3 more

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Flag of UNITED STATES

Brian

5.0

$3,200 USD

3 months ago

MVP Development for Trading Platform - Circulate

Amazing! Highly recommend he nailed it!

Analytics
Node.js
PostgreSQL
Web Development
Backend Development

+5 more

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Flag of UNITED STATES

Beverly A

4.8

$1,125 USD

3 months ago

Apple Books Audiobook Integration Developer Needed

Johnnie did an outstanding job completing my audiobook interconnectivity. He collaborated with me every step of the way to ensure the navigation and features were seamless and met rigorous Apple Books standards.

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T
Flag of AUSTRALIA

Tom

5.0

$1,000 AUD

3 months ago

Build MVP SaaS Platform – Secure Document Delivery with Revocable Access

Excellent to work with, fast and efficient

PHP
Website Design
User Interface / IA
Software Architecture
MySQL

+5 more

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Experience

React, Gatsby, Tailwind CSS Development

Aug, 2023 - Apr, 2025

•

1 year, 7 months

GrowSF

Aug, 2023 - Apr, 2025

•

1 year, 7 months

Worked as a Frontend developer to implement new features, fix bugs and maintain the website using latest technologies including React, Tailwind CSS, etc.

Flag of UNITED STATES

San Francisco, United States

Aug, 2023 - Apr, 2025

•

1 year, 7 months

Frontend Engineer- Next + Tailwind

Mar, 2021 - Feb, 2023

•

1 year, 11 months

Zego | Insurance You Control | Telematics

Mar, 2021 - Feb, 2023

•

1 year, 11 months

Key Responsibilities - UI/UX implementation: Translated Figma designs into pixel-perfect and responsive user interfaces that align with Zego’s brand and user experience standards. - Optimize performance: Implemented web performance optimization techniques, such as server-side rendering, static site generation, lazy loading, and asset bundling, to ensure fast load times and smooth user interactions. ...

Flag of UNITED KINGDOM

London, United Kingdom

Mar, 2021 - Feb, 2023

•

1 year, 11 months

React/Next.js and Node.js fullstack development

Mar, 2018 - Jul, 2020

•

2 years, 4 months

Bravae

Mar, 2018 - Jul, 2020

•

2 years, 4 months

-https://www.bravae.com/

Flag of SPAIN

Barcelona, Spain

Mar, 2018 - Jul, 2020

•

2 years, 4 months

Education

Cornell Law School

2025 - 2025

Master of Science in Legal Studies with a concentration in Tech Law

Flag of UNITED STATES

United States

2025 - 2025

University of Maryland College Park

2024 - 2025

•

1 year

B.S. in Applied Technology

Flag of UNITED STATES

United States

2024 - 2025

•

1 year

Certifications

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Preferred Freelancer Program SLA

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