Principal Full Stack Web Developer

Principal Full Stack Web Developer We are looking for a skilled Full Stack Web Developer (Principal level), aligned to our Kuala Lumpur office on a hybrid workstyle. This will involve ownership of the end-to-end delivery and ongoing development of K3's web estate in support of the SEO & Performance function at K3 Advisory Group in the UK. You will work across both front-end and back-end layers, partnering closely with the UX Designer, Technical SEO Manager and CRO Specialist to implement web improvements, build and maintain integrations and deliver against the digital development roadmap. This role combines hands-on development across the full stack with a strong understanding of SEO technical requirements, performance standards and conversion best practice. Front End: HTML5, JS, CSS3, React, Next.js. Back End: PHP, Node, Python, REST APIs, webhooks, JSON, authentication, CRM integrations & event APIs; AWS, Azure, CDN. COMMERCIAL OBJECTIVES Domain authority, page ranking, site health & CVR. Platform scalability, integration reliability and data integrity across the web estate. KEY RESPONSIBILITIES Leadership & Management Development release schedule & QA delivery. Site performance & uptime, SEO/CRO roadmap delivery. Functional Responsibilities Development & delivery: full-stack codebase development, landing pages, components, CMS development, template creation, front-end/back-end and API integrations. Delivery of new website features, landing pages, microsites, conversion journeys and enhancements set out by technical SEO, performance, CRO and UX teams. CMS management - CMS enhancements, template management, publishing support, workflow improvements & user permissions. AI-driven CMS platforms & tooling - use of AI-enabled CMS features and development tooling to enable high-speed, high-performance delivery and optimisation. MarTech - form integrations, lead routing, API connections, data validation, event tracking. Website performance - page speed, asset loading, JS efficiency, mobile performance, caching, CDN optimisation. Technical SEO enablement - structured data, canonicals, redirects, internal linking frameworks, XML sitemaps, robots.txt requirements. Tracking - tracking scripts, conversion events, pixel deployment, server-side tracking, consent management. Security, stability & governance - security updates, patch management, backup management, uptime monitoring, access control, vulnerability remediation. Backend & infrastructure - server-side logic, database management, API development, cloud infrastructure (AWS/Azure) configuration and CDN management. UX & design collaboration - design implementation, responsive development, accessibility compliance, QA testing, browser compatibility, delivering pixel-perfect implementation, responsive layouts and accessible experiences. KEY PERFORMANCE MEASURES Technical SEO, CRO and Performance KPIs. Quality & speed - QA playbooks met & frameworks delivered against, bi-weekly release schedule. Site speed, uptime, error handling and overall site health / ranking. Integration reliability and API uptime across connected MarTech and CRM systems. Division K3 Advisory Group Department K3 Advisory Group - IT Locations Kuala Lumpur Remote status Hybrid Employment type Full-time About K3 Advisory Group With over 1,200 employees across the Group, 25 offices in the UK, and international bases in Malaysia and Cyprus