Top Senior PHP Developer Jobs in Seattle, WA

Develop and maintain scalable full-stack software across front-end, application, and database layers. Design, test, debug, document, and deploy applications; troubleshoot complex customer issues; build reusable and maintainable components; manage Docker containerized applications; and work with PHP, AWS, REST APIs, databases, JavaScript, and React. Mentor software developers, advise on architecture, and support continuous technology improvement within a cross-functional team.

Lead backend development and architecture in Laravel/PHP while embedding AI as a core system layer. Build AI agents, prompt pipelines, vector search, and automated workflows integrating third-party services. Optimize APIs, databases, and scalable, secure systems. Mentor engineers and collaborate with product and data teams to deliver reliable AI-powered features.

Develop, analyze, refactor, and maintain PHP/C# web applications; design REST APIs and JavaScript front-end components; improve performance, implement test automation and CI, troubleshoot complex customer issues, and ensure consistent best practices across services.

The Senior Backend Engineer will maintain a PHP-based payment platform, migrate to Rust, troubleshoot production systems, and contribute to code quality and deployment cycles.

Remote senior PHP developer role building fintech solutions. Work in a team using PHP 8 and Laravel 8 (or Symfony), integrate external services, design and optimize SQL databases, write unit/integration tests with PHPUnit, and use Linux/CLI. Emphasis on PSR, OOP, SOLID and common design patterns; Docker, GitLab CI, and composer experience are a plus.

Lead architecture, development, and maintenance of scalable Moodle LMS platforms. Build custom plugins and themes, implement SCORM/xAPI/LTI integrations, optimize performance and security, manage CI/CD and cloud deployments, and mentor engineers while collaborating with designers and stakeholders.

Design, build, and maintain FeeNavigator features across backend and frontend. Optimize MySQL queries, write unit/integration/end-to-end tests, refactor complex code, document architecture, participate in code reviews, collaborate with Product and SRE, diagnose incidents and performance issues, and contribute to development process improvements.

The PHP Developer will design and architect web applications using the LAMP stack, collaborate with teams, optimize performance, ensure security, mentor junior developers, and conduct code reviews.