Senior Shopify Developer

Transforming Ideas into Solutions

I'm Howard Johnson, a results-driven Shopify app and theme developer with over 8 years of extensive experience designing, developing, and optimizing custom Shopify themes and apps. Skilled in building scalable, performant ecommerce solutions leveraging Shopify APIs, Liquid, JavaScript, and modern frameworks. Passionate about improving user experience, streamlining store management, and integrating third-party services to enhance functionality. Strong collaborator and mentor with a track record of delivering innovative solutions on time and on budget.

My skills

Making e-Commerce Websites with modern technologies

Trustworthy cooperation, results beyond expectations

JavaScript

TypeScript

HTML

CSS

Shopify CLI

Shopify Theme

Shopify App

Shopify Liquid

React

Redux

jQuery

Next.js

Angular

Vue

Material UI

Sass

Tailwind CSS

Figma

GitHub

PHP

REST API

Graphql

MongoDB

MySQL

PostgreSQL

Prisma

Firebase

AWS

Node.js

Express.js

Python

Nginx

Docker

Professional Experience

Senior Shopify Developer

Comet CX

03/2025 - 05/2025 | Australia, Remote

As a senior developer, spearheaded performance tuning and code refactoring initiatives across multiple live Shopify stores.
Identified and resolved bottlenecks to enhance site speed, user experience, and conversion rates.
Translated complex business requirements into seamless, user-friendly e-commerce experiences with precision and attention to detail.
Maintained effective, transparent communication with cross-functional teams including designers, project managers, and QA testers.
Consistently delivered polished, fully responsive websites that met exact client specifications within accelerated timelines.
Prioritized quality assurance through rigorous testing and validation to ensure a flawless end-user experience across all modern browsers and devices.

Senior Shopify Developer

Kemana Technology Pte. Ltd.

04/2021 - 01/2024 | Jakarta, Indonesia

Developed high-performance Shopify apps using Shopify REST & GraphQL APIs, extending store functionality and improving automation.
Designed and customized Shopify themes using Liquid, HTML, CSS, and JavaScript, ensuring full brand alignment.
Optimized site speed by 30% through efficient coding and performance enhancements.
Integrated third-party services, including payment gateways, analytics, and shipping APIs, to enhance functionality.
Mentored junior developers, conducted code reviews, and implemented best practices for scalability and security.
Provided ongoing technical support and maintenance to ensure minimal downtime and optimal performance.
Significantly reduced cart abandonment rate by 25% by optimizing checkout process.
Coordinated 15 large-scale e-commerce projects with budgets over $500K each.

Junior Shopify Developer

TNGR

07/2018 - 02/2021 | Jakarta, Indonesia

Customized Shopify themes to deliver seamless and visually compelling e-commerce experiences.
Developed reusable components and templates to streamline future development.
Implemented advanced filtering & search features, improving user navigation and conversion rates.
Resolved technical issues, ensuring improved store stability and performance.
Collaborated with stakeholders to translate business requirements into scalable Shopify solutions.
Migrated legacy platforms to Shopify, ensuring smooth transitions with zero data loss.

Shopify Developer (Intern)

TNGR

03/2018 - 07/2018 | Jakarta, Indonesia

Learnt how to write clean Shopify code under the guidance of senior and junior developers.
Developed and maintained internal tools using Ruby on Rails and React to streamline merchant onboarding.
Participated in code reviews and Agile sprint planning, contributing to team decisions and product direction.
Integrated third-party APIs to expand store functionality and improve user experience.
Wrote unit and integration tests using RSpec and Jest, achieving 90%+ test coverage on critical features.