Job Description
Software Engineer (PHP, Playwright, k6) - Mobile RASP & API Security GatewayPay 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 and API security capabilities and is seeking an experienced Contract Engineer to help deliver and operationalise a Mobile RASP and 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
Required Skills
* Strong PHP engineering experience
* Experience with Playwright
* Hands-on experience with k6
* Experienceinsecurity-focused engineering, Ideally including:
o Mobile RASP, application security, API security, or runtime protection technologies (or ability to ramp up quickly)
o Secrets, certificate pins, and lifecycle management
o Certificate pin rotation
o API key and secret lifecycle ownership
o Break-glass access procedures
o Cross-team coordination aligned with mobile release cadence
* Experience supporting systems in steady-state production
Reasonable Adjustments:
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