> Markdown version of [/jobs/ext/556741-senior-web-application-engineer](https://www.wearedevelopers.com/jobs/ext/556741-senior-web-application-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Web Application Engineer - **Company:** Kelly Services Inc. - **Location:** Los Alamitos, CA, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** HTML, JavaScript (Programming Language), PHP (Programming Language), Architectural Patterns, Cascading Style Sheets (CSS), Cloud Computing, Drupal, Electronic Publishing, Performance Tuning, PHP Development, TypeScript, Web Applications, Web Platforms, WordPress, Cloud Platform System, Tailwind, ReactJS, Backend, Front End Software Development, Restful APIs, Api Management, Service Stack - **Published:** June 12, 2026 - **Apply:** https://dejobs.org/x/x/6402C3E934724B15AD0A3C173CAC31CC/job/ ## About the Role This is a high-impact opportunity to help modernize large-scale enterprise platforms with global reach. The team is looking for a seasoned engineer who enjoys solving complex problems, working at scale, and influencing the future of a growing digital ecosystem. You'll gain hands-on ownership of critical systems while collaborating with cross-functional teams in an environment that values performance, accessibility, reliability, and thoughtful engineering. This role offers strong technical growth, exposure to enterprise?level systems, and a balanced hybrid work setup. Required Skills & Experience · 7-10+ years of experience building and supporting modern, production-grade web applications · Strong experience with WordPress or Drupal, including custom PHP development and extensibility · Proven experience supporting high-traffic, enterprise-level websites, including eCommerce platforms · Experience integrating RESTful APIs and third-party services · Strong understanding of system design, architectural patterns, and performance optimization · Ability to collaborate effectively across engineering, product, design, and business teams · Experience leading or contributing to large technical initiatives or platform-level improvements Desired Skills & Experience · Experience in digital publishing, membership platforms, events, or nonprofit environments · Familiarity with accessibility standards and best practices · Experience working within complex, large-scale web ecosystems · Exposure to modern UI frameworks such as Tailwind CSS What You Will Be Doing Tech Breakdown · 40% Front-End Development (React, JavaScript, TypeScript, HTML, CSS) · 40% Back-End Development (PHP, WordPress/Drupal, API integrations) · 20% Architecture, Optimization, and Platform Modernization Daily Responsibilities · 70% Hands-On Development · 15% Technical Planning and System Design · 15% Team Collaboration and Cross-Functional Work, Applicants must be currently authorized to work in the US on a full-time basis now and in the future. ## Description We are seeking a Senior Web Application Engineer for a full-time, hybrid position based in Los Alamitos, California (two days onsite per week) with a global technology and digital publishing organization. This company builds and supports highly scalable, mission-critical web platforms that power content delivery, membership experiences, eCommerce, and digital services used by professionals and organizations worldwide. 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