Senior PHP Developer (PHP, Playwright, k6) – Mobile RASP & API Security Gateway
* Pay Rate: £500-£550 (Outside IR35)
* Duration: 6 months’
* Working arrangement: Once a month - Bristol
We are currently working with an established financial services organisation operating in the investment and wealth management sector. The organisation is strengthening its mobile application and API security capabilities and is seeking an experienced Senior PHP Engineer to help deliver and operationalise an API Security Gateway solution.
This role is delivery‑focused and hands‑on, working across backend engineering, testing, security, and operational readiness in a regulated environment.
Responsibilities
* Design, develop, and maintain secure PHP‑based backend services and APIs
* Build and maintain automated end‑to‑end and functional test suites using Playwright or similar tools
* Execute and analyse performance and load tests using k6) to identify reliability, performance, and scalability risks
* Contribute to security‑focused initiatives, particularly in Mobile RASP, API security, and runtime protection
* Support the platform through rollout, steady‑state operation, and handover
* Collaborate closely with security, mobile, SRE, and platform engineering teams
* Produce clear, audit‑ready technical and operational documentation
* Experience with test automation using Playwright