I am a passionate full-stack website developer with a background in multimedia design and digital marketing. Over the past decade I’ve worked as a freelance developer for both local and international clients, delivering responsive, user-friendly websites that align with business goals. I enjoy solving complex problems and delivering robust, scalable web solutions that perform well on the web. My skills span front- and back-end development (HTML5, CSS3, JavaScript, PHP, WordPress/WooCommerce, Laravel), multilingual site support (WPML), CRM and marketing integrations (HubSpot, Salesforce/Pardot), and SEO optimization. I’m comfortable adopting new technologies quickly, lead internal design/tech collaborations, and mentor junior developers to deliver high-quality work that meets business objectives.

Sebastian Guy Cooper

I am a passionate full-stack website developer with a background in multimedia design and digital marketing. Over the past decade I’ve worked as a freelance developer for both local and international clients, delivering responsive, user-friendly websites that align with business goals. I enjoy solving complex problems and delivering robust, scalable web solutions that perform well on the web. My skills span front- and back-end development (HTML5, CSS3, JavaScript, PHP, WordPress/WooCommerce, Laravel), multilingual site support (WPML), CRM and marketing integrations (HubSpot, Salesforce/Pardot), and SEO optimization. I’m comfortable adopting new technologies quickly, lead internal design/tech collaborations, and mentor junior developers to deliver high-quality work that meets business objectives.

Available to hire

I am a passionate full-stack website developer with a background in multimedia design and digital marketing. Over the past decade I’ve worked as a freelance developer for both local and international clients, delivering responsive, user-friendly websites that align with business goals. I enjoy solving complex problems and delivering robust, scalable web solutions that perform well on the web.

My skills span front- and back-end development (HTML5, CSS3, JavaScript, PHP, WordPress/WooCommerce, Laravel), multilingual site support (WPML), CRM and marketing integrations (HubSpot, Salesforce/Pardot), and SEO optimization. I’m comfortable adopting new technologies quickly, lead internal design/tech collaborations, and mentor junior developers to deliver high-quality work that meets business objectives.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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Language

English
Fluent

Work Experience

Freelance Web Developer & Designer at Freelance / Various Clients
January 1, 2010 - Present
Designing and developing websites professionally for over fifteen years. Notable freelance projects include: 2021 Cybercellar.com site improvements with automated load testing preparation for Black Friday traffic; extended existing WordPress and WooCommerce functionality with multiple e-commerce features; ongoing client site maintenance, content publishing and feature enhancements.
Web Developer at Pears Property Group
December 31, 2013 - October 8, 2025
Designed and developed a custom WordPress-based real estate listing website with advanced user search and interactive functionality; significantly improved internal SEO performance.
WordPress Theme Developer at SVI Design (outsourced to Aid Transparency Index)
December 31, 2013 - October 8, 2025
Outsourced to develop a bespoke WordPress theme for the 2013 Aid Transparency Index, including custom data management and a DOM-element-based input approach for data visualization.
Web Designer at Goddard Partners Global
December 31, 2012 - October 8, 2025
Designed a website for an international advocacy/PR firm.
Front-End Developer at ESET Southern Africa
December 31, 2011 - October 8, 2025
Frontend development for a bespoke Symfony/PHP-based document management system (ESET Partner Zone) and a bespoke WordPress-based website.
Web Developer at Anchor Power Boat Academy
December 31, 2010 - October 8, 2025
Took over development and maintenance of a custom PHP-based promotional and customer booking/order system for powerboat training and equipment supplier.
UI & Web Designer at ShopDirect
September 30, 2014 - October 8, 2025
UI design for B2B and B2C versions of the ShopDirect product, prototyping with Axure and contributing to design brainstorming sessions to define business requirements and create user-centric interfaces.
Development Team Lead at Zero 2one
August 31, 2016 - October 8, 2025
Estimation, costing and planning of new projects; lead development team collaboration; liaised with clients to formulate briefs; mentored and trained new developers; optimized backend and frontend performance; led code reviews for a Laravel-based CRM web app and integrated with web services (Mandrill/MailChimp).
Systems Developer at Woolworths
April 30, 2017 - October 8, 2025
Frontend refactor of the Woolworths e-commerce site using an atomic design approach; implemented server-side JSP/Oracle ATG view templates; participated in peer review and testing.
Systems Developer at Curately
October 31, 2017 - October 8, 2025
Led planning, architecture and refactoring of responsive CSS; introduced a UI component library for reusable HTML/CSS/JS; maintained and extended features; collaborated with designers to ensure feasible solutions.
Web Developer at AUX Studio
October 31, 2018 - October 8, 2025
Frontend-focused web development; improved internal Git workflow; built a bespoke React-based native app for managing data; worked on multiple client websites.
Multimedia Designer and Creative Team Manager at CellSmart Technologies
March 31, 2010 - October 8, 2025
Led a small creative team; designed support materials for business development; designed mobile-friendly websites and application user interfaces; created brand/marketing materials and campaigns.
Multimedia Designer and Creative Team Manager at CellSmart Technologies
March 31, 2010 - October 8, 2025
Led design and creative direction; contributed to branding materials and UI/UX concepts for business development; managed design projects and coordinated with cross-functional teams.
UI & Web Designer at ShopDirect
September 30, 2014 - October 8, 2025
UI design for B2B and B2C versions of product; involved in brainstorming sessions to define business requirements and create visual prototypes; contributed to front-end development workflow.
Development Team Lead at Zero 2one
August 31, 2016 - October 8, 2025
Estimation, costing and planning of new projects; managed development team collaboration and task assignments; liaised with clients; mentored and trained new developers; optimized back-end and front-end performance; led code reviews.
Front End Developer at Woolworths
April 30, 2017 - October 8, 2025
Senior developer collaborating on front-end refactoring of Woolworths’ e-commerce site using an atomic design approach; implemented refactored code in server-side templates; contributed to peer reviews and testing.
Systems Developer at Curately
October 31, 2017 - October 8, 2025
Led development on a social photo sharing and enrichment single-page web application; planned and architected responsive CSS refactors; introduced a UI component library; maintained and enhanced features; mentored team members; led CRM development on Laravel 4.2; integrated with Mandrill/MailChimp; deployed to production servers.
Web Developer at AUX Studio
October 31, 2018 - October 8, 2025
Took over development and maintenance of a custom PHP-based promotional and customer booking/order system for powerboat training and equipment supplier; built a ReactJS and Electron-based native app to manage data for a mobile client.
Freelance Web Developer & Designer at Various clients
January 1, 2010 - Present
Designed and developed websites for a range of clients, specialising in HTML, CSS, PHP and WordPress; responsible for architecture, front-end & back-end development and ongoing maintenance.
Multimedia Designer & Creative Team Manager at CellSmart Technologies
March 31, 2010 - October 8, 2025
Led a small creative team; designed marketing materials, mobile web apps and interfaces; developed brand assets and promotional materials for business development.
UI & Web Designer at ShopDirect
September 30, 2014 - October 8, 2025
Worked on front-end UI design for B2B/B2C ecommerce site; prototyping and responsive design; collaborated with stakeholders to define UX requirements.
Development Team Lead at Zero 2 One
August 31, 2016 - October 8, 2025
Led development team for a custom CRM built on Laravel 4.2; integrated lead capture and messaging workflows; mentored junior developers and ensured code quality.
Senior Developer at Woolworths
April 30, 2017 - October 8, 2025
Front-end refactor of ecommerce website using an atomic design approach; implemented server-side JavaScript templates and contributed to a modular front-end architecture.
Systems Developer at cura.ly / Picking
October 31, 2017 - October 8, 2025
Led planning and implementation of a bespoke data/CRM-like app; introduced UI component library and improved CSS/JS architecture; contributed to code reviews and testing.
Web Developer at AUX Studio
October 31, 2018 - October 8, 2025
Frontend-focused role emphasising ReactJS and Electron-based native app development; improved internal Git workflows and led UI/UX consolidation.
Frontend / WordPress Developer at Comply Advantage
May 31, 2025 - October 8, 2025
Developed a custom WordPress theme with design guidance for an internal design team; integrated 3rd party lead capture and multilingual content support; built a search tool for adverse media/PEP data via API; maintained site content.
Frontend / WordPress Web Developer at Pearl's Property Group
December 31, 2013 - October 8, 2025
Designed and developed a custom WordPress-based real estate listings site with user search and interaction features; improved on-page SEO factors.
Front-end / Web Developer at Goddard Partners Global
December 31, 2012 - October 8, 2025
Designed a website for an international advocacy/PR firm; contributed to frontend development and responsive design.
Front-end Developer at ESET Southern Africa
December 31, 2012 - October 8, 2025
Worked on front-end development for a bespoke Symfony PHP-based document management system and a bespoke WordPress site.
UI & Web Development at Anchor Powerboat Academy
December 31, 2010 - October 8, 2025
Took over development and maintenance of a PHP-based promotional and customer booking system for a power boat training and equipment supplier.
Web Developer at AUX Studio
October 31, 2018 - October 8, 2025
Contributed to backend/frontend enhancements and client projects; worked on multiple client-facing web properties.
Freelance Web Developer & Designer at Self-employed / Freelance
January 1, 2010 - Present
Designed and developed websites professionally for over fifteen years, with a focus on HTML, CSS, JavaScript, responsive design and maintainable code.
Web Developer at CyberCellar
January 1, 2021 - Present
Provided automated load testing for CyberCellar to verify backend readiness for peak traffic; extended WordPress/WooCommerce functionality with several e-commerce features.
Web Developer at Simon Dippenaar & Associates
January 1, 2020 - Present
Outsourced by design consultancy to develop bespoke WordPress-based websites for a small law firm; responsible for site maintenance, feature updates and marketing integrations.
Web Developer at Film Production Collective (via design consultancy, 0307.co.za)
December 31, 2013 - October 8, 2025
Developed a custom WordPress theme for a film production collective, including data management and complex JS/DOM-based user input for data visualization.
Web Developer at Pears Property Group
December 31, 2013 - October 8, 2025
Designed and developed a WordPress-based real estate listing website with custom user search and interactive functionality; significantly improved internal SEO.
WordPress Theme Developer at Aid Transparency Index
December 31, 2013 - October 8, 2025
Outsourced by SVI Design to develop a bespoke WordPress theme for the 2013 Aid Transparency Index, including data management and complex JS-DOM input for data visualization.
Frontend Developer at Goddard Partners Global
December 31, 2012 - October 8, 2025
Designed a website for an international advocacy/PR firm.
Frontend Developer at ESET Southern Africa
December 31, 2011 - October 8, 2025
Frontend development for a bespoke Symfony PHP framework-based document management system and a bespoke WordPress-based website.
Web Developer at Anchor Powerboat Academy
January 1, 2010 - Present
Took over development and maintenance of a custom PHP-based promotional and customer booking/order system website for powerboat training and equipment supplier.
Multimedia Designer and Creative Team Manager at CellSmart Technologies
March 31, 2010 - October 8, 2025
Led a small creative team; designed support materials for business development, design of mobile website and applications, and marketing materials for brands such as KFC, Coca-Cola, ABSA & Standard Bank.
Freelance Web Developer & Designer at Self-employed
January 1, 2010 - Present
Designed and developed websites for a range of clients using HTML, CSS, JavaScript, PHP and WordPress. Focused on responsive design, maintainable code, and delivering performant web solutions with attention to UX and accessibility.
Web Developer & Designer at CyberCellar
January 1, 2021 - Present
Provided automated load testing for an online liquor retailer to ensure backend readiness for peak traffic (e.g., Black Friday). Extended WordPress and WooCommerce functionality with several e-commerce related feature builds.
Web Developer & Designer at Simon Dippenaar & Associates
December 31, 2020 - October 8, 2025
Designed and developed bespoke WordPress-based real estate listing websites. Implemented internal SEO improvements and marketing integrations for multiple legal niche sites.
Systems Developer at Curate.ly
October 31, 2017 - October 8, 2025
Outsourced by design consultancy to develop a custom WordPress theme for a film production collective; implemented data management solutions and complex JavaScript DOM interactions.
UI & Web Developer at Woolworths
April 30, 2017 - October 8, 2025
Senior frontend developer working on refactoring Woolworths' ecommerce website with an atomic design approach; contributed to server-side JS integrations and frontend component architecture.
Development Team Lead at Zero 2 One
August 31, 2016 - October 8, 2025
Led development teams, including estimation, costing, mentoring, client liaison, and performance optimization of backend and frontend systems; contributed to CRM integrations and process improvements.
UI & Web Designer at ShopDirect
September 30, 2014 - October 8, 2025
UI design for Alytic/Comaly product lines (B2B and B2C) using prototyping tools; collaborated with clients to define business requirements and translate them into frontend designs.
Multimedia Designer & Creative Team Manager at CellSmart Technologies
March 31, 2010 - October 8, 2025
Led a small creative team, designed supporting materials for business development, mobile web applications, user interfaces, and marketing collateral; contributed to mobile/digital marketing strategies for major brands.
Web Developer at Anchor Powerboat Academy
December 31, 2010 - October 8, 2025
Took over development and maintenance of a PHP-based promotional and customer booking/order system for a powerboat training and equipment supplier.
Freelance Web Developer & Designer at Independent / Freelance
January 1, 2010 - Present
Independent freelance web developer and designer providing custom WordPress development, responsive design, site maintenance, and marketing integrations for local and international clients.
WordPress / Web Developer at Ripjar
February 1, 2024 - October 15, 2025
Provided custom development of new features and designs using the client’s WordPress theme; guided in-house design team on responsive web design; implemented third-party lead-capture integrations; assisted with hiring and code reviews; supported ongoing maintenance and content publishing.
WordPress Developer / Web Designer at Comply Advantage
May 1, 2025 - October 15, 2025
Developed a custom WordPress theme to support designs; guided the internal design team on responsive design; implemented ACF Pro-based custom layouts; integrated third-party tools (HubSpot, Salesforce/Pardot); implemented multilingual content (WPML); created lead capture forms and demos; supported frontend accessibility revisions and ongoing maintenance.
Frontend / WordPress Developer at Cybercellar
January 1, 2021 - Present
Provided automated load testing for online liquor retailer and extended WordPress & WooCommerce functionality with additional e-commerce features.
Web Developer at Simon Dippenaar & Associates
January 1, 2020 - Present
Designed and developed bespoke WordPress-based websites for a small law firm; responsible for site maintenance, feature updates, and marketing integrations for several legal niches.
Systems Developer at Curately / Curate.ly
October 31, 2017 - October 15, 2025
Led development on a social photo sharing single-page web app built on a custom JavaScript framework; planning, tooling and architecture of responsive CSS refactoring; introduced a UI component library; supported maintenance and feature development; collaborated with designers.
Web Developer at AUX Studio
October 31, 2018 - October 15, 2025
Specialist in front-end technologies and WordPress; improved internal Git workflow; built a bespoke ReactJS & Electron-based desktop-native app to manage data for a consumer mobile app; contributed to client site projects.
Senior Front-End Developer at Woolworths
April 30, 2017 - October 15, 2025
Led front-end refactor of Woolworths' ecommerce website using an atomic design approach; implemented server-side JS/POracle ATG views; participated in peer reviews and testing.
Development Team Lead at Zero2One
August 31, 2016 - October 15, 2025
Led development team collaboration and task assignment; mentored new developers; coordinated with clients to formulate briefs; responsible for back-end and front-end performance optimization; mentored team members.
UI & Web Designer at ShopDirect
September 30, 2014 - October 15, 2025
UI design for B2B/B2C product interfaces; prototyping using AXURE; contributed to business requirements with clients.
Multimedia Designer & Creative Team Manager at CellSmart Technologies
March 31, 2010 - October 15, 2025
Led a small creative team; designed marketing materials, mobile web interfaces, and branding; contributed to promotional campaigns and product visuals.

Education

Usable Security (online) at University of Maryland
January 1, 2016 - October 8, 2025
Diploma in Media Design and Technology at Damelin
January 1, 2006 - January 1, 2007
Diploma in Media Design and Technology at Damelin CT
January 1, 2006 - January 1, 2007
Full Stack Web Developer Specialization (online) at Hong Kong University of Science and Technology
January 1, 2016 - October 8, 2025
Usable Security at University of Maryland (online)
January 1, 2016 - October 8, 2025
Full Stack Web Developer Specialization at Coursera / Hong Kong University of Science and Technology
January 1, 2016 - October 8, 2025
Diploma in Media Design and Technology at Damelin CT
January 1, 2006 - January 1, 2007
Full Stack Web Developer Specialization (online) at Hong Kong University of Science and Technology
January 1, 2016 - January 1, 2016
Usable Security (online) at University of Maryland
January 1, 2016 - January 1, 2016
Diploma in Media Design and Technology at Damelin College (Cape Town)
January 1, 2006 - January 1, 2007
Full Stack Web Developer Specialization at Hong Kong University of Science and Technology
January 1, 2016 - January 1, 2016
Usable Security at University of Maryland
January 1, 2016 - January 1, 2016

Qualifications

Diploma in Media Design and Technology
January 1, 2006 - December 31, 2007
Full Stack Web Developer Specialization
January 1, 2016 - January 1, 2016
Usable Security
January 1, 2016 - January 1, 2016
Full Stack Web Developer Specialization
January 1, 2016 - January 1, 2016
Usable Security
January 1, 2016 - January 1, 2016
Driver's License
January 11, 2030 - October 15, 2025

Industry Experience

Software & Internet, Professional Services, Media & Entertainment, Retail, Education

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
See more