PHP Developer - Outside IR35
Posted 3 days ago by Totaljobs
£500 Per day
Outside
Hybrid
Bristol (BS1), BS1
Summary: The PHP Developer role focuses on migrating payment functionality from a legacy PHP system to a new AWS-hosted Java microservice. The contractor will be responsible for updating existing payment journeys and ensuring secure integration with the new payment component. This position requires a strong emphasis on security, reliability, and user experience. The role is primarily remote with occasional meetings in London or Bristol.
Key Responsibilities:
- Modify existing PHP payment journeys to redirect or hand off to a new external payment component
- Implement secure redirect and callback handling between the PHP application and the AWS-hosted Java microservice
- Collaborate with the Java/AWS team to define and agree on integration contracts, redirect URLs, tokens, and callback payloads
- Ensure appropriate audit logging, error handling, and traceability throughout the migration
- Support regression testing and extend existing test coverage
- Contribute to Codeception and Jest test suites as required
Key Skills:
- Strong commercial experience with PHP 7.x, ideally within large legacy or monolithic codebases
- Hands-on experience with payment integrations, such as Stripe
- Strong understanding of 3DS flows and PCI-DSS considerations
- Proven experience migrating functionality out of a monolith into external services
- Good understanding of HTTP integrations, service layers, and API contracts
- Experience implementing secure redirect patterns, such as OAuth-style flows, signed URLs, and HMAC tokens
Salary (Rate): £500 per day
City: Bristol
Country: United Kingdom
Working Arrangements: hybrid
IR35 Status: outside IR35
Seniority Level: Mid-Level
Industry: IT
PHP Developer - Payments Migration
Rate: £500 per day (Outside IR35)
Duration: 6 months
Location: Mostly remote - once per month in London or Bristol
I am currently working with a leading financial services company to undertake a critical migration of payment functionality from a legacy on-premise PHP monolith into a new AWS-hosted Java microservice owned by a separate engineering team.
We are looking for an experienced PHP contractor to own and deliver the PHP-side of the migration, ensuring existing payment journeys are updated to integrate with the new external payment component, while safely decommissioning legacy in-application payment logic.
This role sits at the intersection of legacy PHP, payments, and service integration, and requires a strong focus on security, reliability, and seamless user experience.
Responsibilities
- Modify existing PHP payment journeys to redirect or hand off to a new external payment component
- Implement secure redirect and callback handling between the PHP application and the AWS-hosted Java microservice
- Collaborate with the Java/AWS team to define and agree: Integration contracts, Redirect URLs, Tokens and callback payloads
- Ensure appropriate audit logging, error handling, and traceability throughout the migration
- Support regression testing and extend existing test coverage
- Contribute to Codeception and Jest test suites as required
Required Skills
- Strong commercial experience with PHP 7.x, ideally within large legacy or monolithic codebases
- Hands-on experience with payment integrations, such as Stripe
- Strong understanding of 3DS flows and PCI-DSS considerations
- Proven experience migrating functionality out of a monolith into external services
- Good understanding of HTTP integrations, service layers, and API contracts
- Experience implementing secure redirect patterns, such as: OAuth-style flows, Signed URLs, HMAC tokens
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