Senior PHP Backend Engineer- High-Performance FinTechLocation: Full RemoteEmployment: PermanentSalary: £120,000About the company:Join a lean, venture-backed product team building automation software that eliminates manual Back Office workflows in complex, traditional industries. The platform is scaling fast, and we''re looking for a Senior PHP Engineer to take ownership of core Back End services and performance-critical systems. You''ll work closely with product and leadership, shaping the roadmap and shipping features that reach thousands of business users.What you''ll doArchitect, build, and evolve robust Back End services and APIs in PHP with a strong focus on performance, scalability, and reliability.Drive profiling and tuning for high-concurrency/low-latency environments; lead efforts on caching, queues, and database optimisation.Implement best practices in security (including payment flows) and compliance (eg, PCI-DSS), championing code quality across the codebase.Own API architecture andamp; integrations, including resilient error handling, idempotency, and graceful retries; support two-way sync with external systems.Collaborate cross-functionally on the product roadmap; contribute to engineering standards, testing discipline, and code reviews.Tech environment:PHP (modern) with async/event-loop concepts (eg, ReactPHP/FrameworkX), custom libraries, and clean, testable design.APIs: RESTful services, two-way integrations, robust error handling andamp; retry/backoff.Perfor