Senior Backend Engineer Overview Rex/Cirrus8 is an 100-person digital product and service company with thousands of customers using our CRM, digital advertising suite and site builder for the Real Estate industry in the UK, Australia and New Zealand. As a SaaS provider, our monthly recurring revenues are growing as we expand our product portfolio to new markets and customer segments. This gives us a lot of agility and flexibility in decision-making, and we still have the heart of a start-up in the way that we approach product problems and technical solutions. Our product development teams utilise agile methodologies and work together to solve problems and deliver customer outcomes. About this role As a Senior Backend Engineer, you'll be a key technical leader who collaborates across our organization to solve complex customer challenges. Beyond feature development, you'll guide critical technical migrations and architectural improvements, with a focus on modernizing our PHP codebase through clean, strongly typed implementations. Key Responsibilities Architect and implement robust technical solutions that balance customer needs with business requirements Provide hands-on technical mentorship to team members, fostering a culture of code quality and continuous improvement Build and maintain high-performance, well-documented APIs following industry best practices Assist in the migration of large-scale PHP codebases to modern, strongly typed implementations Foster team collaboration and knowledge sharing in our hybrid/remote environment What you’ll bring Proven experience refactoring and migrating large PHP codebases to modern frameworks (Laravel, Symfony) Strong commitment to clean, maintainable, and strongly typed code with demonstrated results Exceptional team collaboration skills with ability to align technical decisions across diverse stakeholders Demonstrated success breaking complex problems into manageable components and iterating toward optimal solutions Professional experience building scalable, well-documented APIs Ability to balance technical excellence with business priorities and constraints Clear communication skills with a talent for explaining technical concepts to both technical and non-technical audiences Proactive mindset that embraces ownership, initiative and continuous learning Nice to Haves A proven track record of mentorship or team leadership Prior experience working in cross-functional teams Experience in introducing modern framework components to legacy systems Familiarity with CI/CD concepts Experience using Docker and Kubernetes Why Join Us? We’re a product-first company with a growing, supportive team and real impact Work with autonomy in a flexible hybrid or remote environment Access to a $3,000 annual learning budget and 2 weeks of learning leave Enjoy paid parental leave, wellness perks, and a vibrant culture Modern tech stack, great equipment, and a people-first approach to building software