We are looking for an experienced Senior PHP developer to join our team and help us improve a legacy platform with API capabilities and enhanced error logging & monitoring, to support future integrations and phased platform  modernisation for one of our clients. 
The ideal candidate will have a proven track record of delivering high quality, PHP based applications with API integrations for enterprise-level organizations.

Responsibilities
Design & implement feature and resource oriented REST endpoints compatible with the existing legacy code
Author and generate OpenAPI/Swagger specs 
Secure implementation of the authentication and authorization for public facing endpoints including session based authentication, rate limiting and request validation 
Remedy and refactor critical issues in the legacy code base that can impact the API implementation  
Implement structured logging and error tracking across the application (e.g. logs, correlation/request IDs, etc…)
Setup application performance & error monitoring with proactive alerts 
Write unit & integrations tests for the new API endpoints 
Coordinate with the client team to deliver the changes with zero disruption to the current functionality & ongoing feature development
You will take part in peer review of team deliverables, attend and take part in agile ceremonies, and demonstrate delivery of your work to client stakeholders at the end of each sprint

We are looking for someone that has:
Solid experience with legacy PHP based applications (procedural & light OOP) and comfortable with refactoring rather than rewriting from scratch  
Demonstrable REST API design experience including versioning strategy and documentation 
Hands on experience implementing API authentication, authorisation and rate limiting for existing applications
Strong MySQL knowledge and able to safely work with existing schemas & queries without introduction regression issues
Practical experience instrumenting PHP applications with structured logging and error tracking 
Familiarity with setting up monitoring and alerting techstack within a PHP based environment
A testing mindset for legacy code
Working knowledge of continuous delivery and continuous integration to deliver software incrementally and in an agile way (git, gitFlow,  etc…) 
Excellent problem-solving and analytical skills
Working within a project management/agile delivery methodology as part of a wider team
Excellent communication and teamwork skills
Fluent in English 

Here are some other skills and experience that would be considered a plus for this role:
- Exposure to Spec Driven Development, writing specs and machine readable API contracts 
- Hands on experience with agentic SDLC
- Experience with Observability tools 
- Experience with security and compliance best practices

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