Senior Backend Engineer - PHP and Symfony in City of London

A fantastic opportunity for a Senior Backend Engineer to join a growing, integration-focused SaaS company. Working within a small and experienced engineering team, you will build and maintain a wide range of production integrations with external software platforms. This is a highly autonomous role combining hands-on PHP and Symfony development with complex third-party API integration work and increasing ownership of the company’s AWS infrastructure.

Location: Fully remote within the UK. Ideally, you will be based near London, as you must be available to travel to London for occasional team meetings.

Salary: £55,000 - £70,000 per annum depending on experience. Additional paid weekend on-call rota, performance bonus and share options.

Requirements for Senior Backend Engineer:

• Strong commercial experience developing production software using PHP
• Commercial experience using Symfony
• Proven experience building and maintaining multiple third-party integrations in production
• Experience with REST APIs, webhooks, OAuth, rate limiting, retries, error handling and asynchronous systems
• Strong production experience with AWS, including containers, monitoring and incident response
• Experience with infrastructure as code, ideally Terraform
• Strong understanding of automated testing, code quality and CI/CD practices
• Experience independently troubleshooting integrations involving external systems and incomplete documentation
• A pragmatic approach to engineering, with the ability to balance technical quality against commercial delivery requirements
• Comfortable working autonomously within a small, fully remote engineering team
• Confident proposing solutions and challenging technical decisions constructively
• Willingness to participate in a paid weekend on-call rota - approx. once a month (you will be paid even if no calls are taken)
• Based in the UK, with the right to work
• Experience within payments, travel technology, marketplaces, hospitality or another integration-heavy SaaS environment would be beneficial

Responsibilities for Senior Backend Engineer:

• Design, build and maintain multiple third-party integrations using PHP and Symfony
• Develop individual microservices connecting the platform with external APIs and webhook-based systems
• Take ownership of a new family of integrations from initial design through to production
• Contribute to platform and API features across the wider software estate
• Investigate production issues and identify whether problems originate from the code, configuration or an external platform
• Learn the existing AWS environment and progress towards significant infrastructure ownership
• Improve observability, automated testing and CI/CD quality gates across the platform
• Support upgrades to current versions of PHP and Symfony
• Contribute informed opinions to architectural decisions as the platform continues to scale
• Participate in a paid weekend on-call rota supporting urgent out-of-hours issues
• Collaborate asynchronously through messaging, pull requests and focused technical discussions

What this role offers:

• Significant technical ownership within a growing, integration-focused SaaS business
• The opportunity to influence architecture, engineering practices and the future direction of the platform
• Excellent longer-term scope to take on wider technical and management responsibilities as the company grows

If you would like to apply for this unique Senior Backend Engineer role, please send your CV via the relevant links!

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