Senior Backend Engineer, Partner Integrations, PHP Symfony

Senior Backend Engineer, Partner Integrations, PHP Symfony

A fantastic opportunity for a Senior Backend Engineer to join a growing, integration-led SaaS company. This is a hands-on role for a true integration engineer who has repeatedly built and maintained connections with different external partners, rather than a general product engineer who has only occasionally connected third-party services. You will use PHP and Symfony to develop a portfolio of production integrations while also contributing to the company’s AWS infrastructure.

Location: Fully remote within the UK, although ideally you will be based near London. You must be available to travel to London for occasional team meetings and start work at 8:30am UK time.

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

Requirements for Senior Backend Engineer, Partner Integrations:

• Strong commercial experience developing production backend systems using PHP

• Commercial Symfony experience within production applications or services

• Proven experience personally building and maintaining multiple integrations with different external partners

• Experience taking integrations through development, testing, launch and ongoing production support

• Strong understanding of REST APIs, webhooks, OAuth, rate limiting, retries, idempotency, queues and asynchronous processing

• Experience building connectors, adapters or transformation layers between different external systems

• Experience monitoring production integrations and investigating failures involving both internal and partner systems

• Meaningful production AWS experience, including containers, monitoring, infrastructure as code and incident response

• Strong understanding of automated testing, code quality and CI/CD practices

• Comfortable adapting integrations when partners change their APIs, schemas, credentials or platform behaviour

• Experience working autonomously within a startup, scale-up, SME or small product engineering team

• A pragmatic approach to engineering, with the ability to balance technical quality against commercial delivery requirements

• Comfortable taking long-term ownership of integrations after launch

• Experience within payments, travel technology, marketplaces, hospitality, accounting software, logistics, e-commerce, martech or another integration-heavy SaaS environment would be beneficial

• Must be based in the UK with existing right to work. Visa sponsorship is not available

Responsibilities for Senior Backend Engineer, Partner Integrations:

• Design, build and maintain a portfolio of integrations with external software platforms

• Develop partner-specific connectors using PHP and Symfony

• Translate different external data structures and behaviours into reliable internal formats

• Take integrations through development, sandbox testing, launch and ongoing support

• Maintain existing integrations as external APIs, schemas and authentication requirements change

• Investigate production failures across internal services and third-party platforms

• Build reliable integration workflows using webhooks, queues and asynchronous processing

• Develop backend platform and API features across a microservices-based environment

• Improve automated testing, observability and CI/CD quality gates

• Contribute to the operation and development of the company’s AWS infrastructure

• Participate in a paid weekend on-call rota supporting urgent integration issues

• Contribute informed opinions to technical and architectural decisions as the platform grows

What this role offers:

• Ownership of business-critical partner integrations within a growing SaaS company

• The opportunity to influence integration 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 expands

Applications:

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

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Keywords: Senior Backend Engineer / Senior Software Engineer Integrations / Partner Integration Engineer / Backend Integration Engineer / API Integration Engineer / Connectivity Engineer / Ecosystem Engineer / Connector Engineer / Integration Platform Engineer / Senior PHP Developer / Symfony Developer / Integration Developer / PHP / Symfony / AWS / REST APIs / Webhooks / OAuth / Terraform / Docker / Microservices / CI/CD / GitHub Actions / Event-Driven Architecture / Infrastructure as Code / Message Queues / MySQL / MariaDB / Redis / DynamoDB / Prometheus / Grafana / Computer Science / Software Engineering / Information Technology / Computing / Mathematics

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