Senior PHP Developer – Gallagher
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Introduction
At Gallagher Benefit Services, you’re a trusted partner to organizations navigating some of their most important people decisions. We help clients build better workplaces, where people feel supported, empowered, and inspired to thrive. Whether it’s shaping benefit strategies, designing wellbeing programs, or advising on workforce challenges, the work you do creates meaningful change for businesses and the people who power them. We’re a community of bold explorers, trusted experts, and compassionate partners, working side by side to solve problems, shape the future of work, and encourage curiosity and collaboration. Your ideas have room to grow and your contribution matters.
Overview
The Senior PHP Developer will play a key role in the maintenance, enhancement, and strategic development of a proprietary extensible multi‑tenancy data‑driven platform that underpins a diverse portfolio of digital solutions across global markets. Architected as a headless, RESTful PHP application, this platform supports scalable content management, dynamic user authentication, and integration with a broad range of frontend technologies and external systems.
Working closely with the Principal Developer, Head of Technology, and cross‑functional delivery teams, the successful candidate will be responsible for implementing secure, efficient, and maintainable code while contributing to the broader evolution of the platform architecture, including driving the decomposition of monolithic functions into modular microservices within a fully cloud‑native, event‑driven ecosystem.
The role demands a strong foundation in PHP development, a product‑minded approach to change management, and an understanding of scalable backend systems. The Senior PHP Developer will also contribute to a shared component model and reusability strategy that prioritises maintainability, interoperability, and platform extensibility across client solutions.
How You'll Make An Impact
* Maintain and extend a proprietary PHP‑based platform with a focus on stability, security, and performance.
* Develop secure, reusable, and scalable containerised backend services using PHP 8, Symfony, and Doctrine ORM.
* Contribute to the strategic decoupling of platform capabilities into independently deployable Symfony‑based microservices, aligned with a cloud‑native, event‑driven architecture.
* Ensure compatibility and integration with frontend applications via RESTful APIs (commonly Angular‑based, but frontend‑agnostic).
* Apply a productised approach to change management, evaluating bespoke client requests for broader reuse across the platform.
* Uphold and contribute to platform‑wide engineering standards, including secure coding, error handling, and performance optimisation.
* Collaborate on API design and domain modelling for new services and platform extensions.
* Support CI/CD workflows and contribute to containerised deployment processes using Docker and Kubernetes.
* Assist in the identification, resolution, and prevention of bugs and vulnerabilities in production and development environments.
* Produce and maintain technical documentation, ensuring alignment with team standards and platform governance.
* Participate in sprint planning, backlog grooming, and peer code reviews.
* Work closely with security and infrastructure teams to ensure compliance with regulatory and organisational standards.
* Provide informal mentoring and guidance to mid‑level and junior developers within the team.
* Stay abreast of Symfony ecosystem updates and relevant advancements in PHP, cloud‑native design, and scalable backend patterns.
About You
* Background working on a productised platform or multi‑tenant system serving multiple clients.
* Experience integrating with third‑party systems including HRIS, payroll platforms, and identity providers (e.g., OKTA).
* Familiarity with ElasticSearch, secure SFTP data handling, and platform performance monitoring.
* Understanding of event queue systems and asynchronous processing.
* Knowledge of frontend‑backend integration with Angular or mobile clients via REST APIs.
* Awareness of privacy‑by‑design and compliance practices in platform development (e.g., GDPR).
* Previous experience supporting the migration of monolithic applications to modular service‑oriented architectures.
Eligibility Requirements
Must have the Right to Work in the United Kingdom.
Compensation and Benefits
On top of a competitive salary, great teams and exciting career opportunities, we also offer a wide range of benefits.
Minimum core benefits
* Minimum of 25 days holiday, plus bank holidays, and the option to ‘buy’ extra days.
* Defined contribution pension scheme, with Gallagher contributions.
* Life insurance covering 4× basic annual salary, upgradable to 10×.
* Income protection covering up to 50% of annual income, with top‑up options.
* Health cash plan or private medical insurance.
Other benefits
* Three fully paid volunteering days per year.
* Employee Stock Purchase plan.
* Share incentive plan, HMRC approved and tax‑effective.
* Critical illness cover.
* Discounted gym membership with access to over 3,000 gyms.
* Season ticket loan.
* Discounted voucher portal for everyday savings.
* Emergency back‑up family care.
* And many more…
We value inclusion and diversity
Inclusion and diversity (I&D) is a core part of our business and embedded into the fabric of our organisation. For more than 95 years, Gallagher has led with a commitment to sustainability and to support the communities where we live and work.
Gallagher embraces employees’ diverse identities, experiences and talents, allowing us to better serve our clients and communities. Inclusion is a conscious commitment and diversity a vital strength. We live out The Gallagher Way to its fullest.
Gallagher is Disability Confident and committed. We pledge an inclusive and accessible recruitment process and support employees with long‑term health conditions or disabilities. If you require reasonable adjustments to your application, please contact TAGlobalSupport@ajg.com.
Our employing entity, Arthur J. Gallagher Services (UK) Limited, is a Living Wage employer. We are committed to diversity and opportunity for all and are opposed to any form of less favourable treatment on the grounds of gender, race, disability, and other protected characteristics. Equal employment opportunity is extended in all aspects of the employer‑employee relationship.
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