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I’m a Senior Full Stack Web Developer with 6+ years building and maintaining marketing-focused web applications and digital assets using PHP, MySQL, JavaScript (jQuery), HTML, CSS, and Twig. I love turning complex requirements into reusable components and scalable templates that accelerate delivery and improve quality. I thrive in cross-functional teams and hands-on in Linux and Kubernetes environments with CI/CD using Git, Jenkins, and Perforce. I also explore AI-assisted content workflows with structured QA gates to maintain quality while accelerating production and launch cycles. I value measurable outcomes, clean architecture, and collaborative problem solving that drives reliable, performant experiences for users and stakeholders.…I’m a Senior Full Stack Web Developer with 6+ years building and maintaining marketing-focused web applications and digital assets using PHP, MySQL, JavaScript (jQuery), HTML, CSS, and Twig. I love turning complex requirements into reusable components and scalable templates that accelerate delivery and improve quality. I thrive in cross-functional teams and hands-on in Linux and Kubernetes environments with CI/CD using Git, Jenkins, and Perforce. I also explore AI-assisted content workflows with structured QA gates to maintain quality while accelerating production and launch cycles. I value measurable outcomes, clean architecture, and collaborative problem solving that drives reliable, performant experiences for users and stakeholders.

John Wonjin Choi

Full Stack Developer, Web Developer, Back-End Developer, +2

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I’m a Senior Full Stack Web Developer with 6+ years building and maintaining marketing-focused web applications and digital assets using PHP, MySQL, JavaScript (jQuery), HTML, CSS, and Twig. I love turning complex requirements into reusable components and scalable templates that accelerate delivery and improve quality. I thrive in cross-functional teams and hands-on in Linux and Kubernetes environments with CI/CD using Git, Jenkins, and Perforce. I also explore AI-assisted content workflows with structured QA gates to maintain quality while accelerating production and launch cycles. I value measurable outcomes, clean architecture, and collaborative problem solving that drives reliable, performant experiences for users and stakeholders.…I’m a Senior Full Stack Web Developer with 6+ years building and maintaining marketing-focused web applications and digital assets using PHP, MySQL, JavaScript (jQuery), HTML, CSS, and Twig. I love turning complex requirements into reusable components and scalable templates that accelerate delivery and improve quality. I thrive in cross-functional teams and hands-on in Linux and Kubernetes environments with CI/CD using Git, Jenkins, and Perforce. I also explore AI-assisted content workflows with structured QA gates to maintain quality while accelerating production and launch cycles. I value measurable outcomes, clean architecture, and collaborative problem solving that drives reliable, performant experiences for users and stakeholders.

Available to hire

I’m a Senior Full Stack Web Developer with 6+ years building and maintaining marketing-focused web applications and digital assets using PHP, MySQL, JavaScript (jQuery), HTML, CSS, and Twig. I love turning complex requirements into reusable components and scalable templates that accelerate delivery and improve quality. I thrive in cross-functional teams and hands-on in Linux and Kubernetes environments with CI/CD using Git, Jenkins, and Perforce.

I also explore AI-assisted content workflows with structured QA gates to maintain quality while accelerating production and launch cycles. I value measurable outcomes, clean architecture, and collaborative problem solving that drives reliable, performant experiences for users and stakeholders.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at LiveRamp

December 1, 2021 - Present

Developed and maintained PHP services and MySQL schemas for marketing and customer-facing web applications, shipping 20+ production releases per quarter through Git and Jenkins CI/CD. Built a reusable Twig component system (layouts, modules, forms) that cut landing page build time from 3 days to 1 day on average. Implemented responsive UI and form behavior using JavaScript and jQuery, reducing client-side validation errors by 35% and improving successful form submissions by 8% across key acquisition flows. Integrated internal and third-party APIs to automate lead capture and downstream handoffs, reducing manual triage by 6–10 hours per week. Built and maintained responsive HTML email templates with modular Twig partials and repeatable QA checklists, reducing rendering defects by 60% release over release. Implemented email automation support (template versioning, UTM consistency, event tracking hooks), improving campaign readiness from 2 days to 1 day. Optimized MySQL queries with ind

Software Engineer at Cox Automotive Inc

September 1, 2019 - November 1, 2021

Delivered marketing-facing web features on LAMP stack using PHP and MySQL; implemented backend endpoints, server-side validation, and data persistence for lead and campaign workflows. Built responsive web pages and HTML email templates aligned with brand guidelines, reducing cross-client email rendering issues by 50% through standardized patterns and test coverage. Implemented interactive UI behavior using JavaScript and jQuery (dynamic forms, conditional fields, inline validation), improving lead form completion rate by 10% on high-traffic pages. Standardized page construction with Twig templates and reusable partials, reducing duplicate markup by 40% and improving maintainability across multiple campaigns and seasonal refreshes. Integrated APIs for CRM, analytics, and notification routing, reducing lead delivery delay from 15 minutes to under 2 minutes and improving data completeness by enforcing required field validation. Diagnosed production issues using logs and database analysis

Software Engineer Intern at Western Digital

July 1, 2019 - September 1, 2019

Implemented backend enhancements in PHP and optimized MySQL queries for internal web tools, reducing report generation time from 4 minutes to 45 seconds through indexing and query tuning. Built responsive UI components using HTML, CSS, and JavaScript, improving usability and reducing repeated support requests by 25% for the tool’s score workflow. Assisted with troubleshooting and validation in Linux environments, closing 15+ bugs during the internship and documenting fixes for faster team handoffs. Participated in code reviews and version control workflows, improving merge quality and reducing rework by aligning changes to team standards.