Software Engineer (PHP, Playwright, k6) at Sanderson , Bristol, £500-£550 per day

Software Engineer (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 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:
  • Mobile RASP, application security, API security, or runtime protection technologies (or ability to ramp up quickly)
  • Secrets, certificate pins, and lifecycle management
  • Certificate pin rotation
  • API key and secret lifecycle ownership
  • Break-glass access procedures
  • Cross-team coordination aligned with mobile release cadence
• Experience supporting systems in steady-state production

Reasonable Adjustments:

Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people of all backgrounds and perspectives. Our success is driven by our people, united by the spirit of partnership to deliver the best resourcing solutions for our clients.

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