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.

If you need any help or adjustments during the recruitment process for any reason , please let us know when you apply or talk to the recruiters directly so we can support you.

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