Senior Backend Software Engineer (PHP/Python)

We are looking for a Senior Backend Software Engineer with deep expertise in PHP and Python to join our WP Rocket Addons team. You will design and lead technical projects from conception through delivery, balancing architectural decisions with practical execution, to deliver working products to hundreds of thousands of users. You thrive in an environment where quality, testing, and AI-driven development are non-negotiable. You have a « get-it-done » mindset, and you are eager to deliver value to our users and to iterate from MVP to a stellar product. Employment type: Full-time contract, 1 year Location: Remote (UTC+3 to UTC-5) Hours: Flexible; core hours around 2PM CET (±2 hours) Start date: ASAP Key Responsibilities Architect and implement backend solutions for WP Rocket Addons services, including user-facing features, e-commerce platforms, and internal tooling. Lead technical projects end-to-end: design decisions, implementation strategy, testing approach, and delivery Build and maintain services handling hundreds of thousands of users, with a focus on performance, reliability, and observability Champion automated testing and code validation; ensure code quality and reliability through comprehensive test suites Collaborate with Product and Engineering teams to identify the best technical approaches and deliver user-focused solutions Use AI as a development partner: leverage AI for framing, code generation, code review, testing and documentation, while maintaining human oversight on architecture and quality Contribute to continuous improvement of internal systems, tooling, AI systems, and engineering practices Participate in code review, deployment, and operational support for the services you build Required Experience Technical Skills Solid, proven experience building and maintaining PHP and Python applications Modern development practices: OOP, testing (unit, integration, end-to-end), observability (monitoring, logging, tracing) Comfortable with DevOps basics: Docker, Kubernetes, and infrastructure concepts Experience designing systems for scale and reliability Familiarity with AI-driven development: delegating low-risk tasks to AI with harness approaches and using AI as an assistant on more complex topics Professional Attributes Strong sense of ownership: you lead projects, not just execute tasks Quality-focused: you advocate for testing, code standards, and best practices Collaborative: you work effectively across teams and communicate clearly Fluent in English (written and spoken) Nice to Have Experience with Django (Python) or WordPress (PHP) Node.js experience Our Stack PHP (WordPress), Python (Django), Node.js PostgreSQL, CockroachDB, Redis Docker & Kubernetes Anthropic Claude & GitHub Copilot Sentry, Graphana, Prometheus What We Offer Work with a talented, distributed engineering team across the world True ownership: lead technical decisions on meaningful projects Strong engineering culture focused on quality, collaboration, and continuous improvement Flexible remote work with flexible hours Home office budget and monthly remote-work allowance Opportunity to grow with a high-performing engineering organization About WP Media WP Media, founded in 2014 in Lyon, France, builds leading WordPress optimization tools used by millions of websites worldwide. WP Rocket is the premium caching plugin for WordPress (5M+ active installations), and Imagify is our free image optimization service (19B+ images optimized). We are part of group.one, a major European provider of web hosting, cloud services, and digital marketing solutions serving 2M+ customers. Our engineering team values mutual respect, collaboration, inclusivity, continuous improvement, and technical excellence. We embrace AI-driven development and maintain high standards for code quality and developer experience. Ready to apply? Tell us about your experience in leading projects on highly scalable backend services, your approach to quality and testing, and how you use AI in your development workflow.