Backend Systems Developer - Build the integrations that keep a high-growth digital business moving. Salary: £40,000 - £60,000 Location: Hybrid (3 Days - Runcorn) About the Opportunity We're partnering with an ambitious technology-driven organisation that's investing heavily in its engineering capability. They're looking for an experienced Backend Systems Developer to help build and enhance the integrations that sit at the heart of a large-scale digital platform.This is an opportunity to work on business-critical systems where reliability, scalability and performance genuinely matter. You'll be developing the services that connect customer-facing applications with warehouse, finance and operational platforms, ensuring millions of data points move accurately and efficiently every day.If you enjoy solving complex integration challenges, building resilient backend services and working in a collaborative engineering environment, this could be an excellent next step. What You'll Be Doing Designing and developing backend integrations between digital platforms and core business systems including warehouse, ERP and finance solutions. Building scalable middleware to support order processing, inventory synchronisation and real-time data exchange. Developing modern cloud-native services using clean, maintainable architecture. Creating and maintaining REST APIs and event-driven integrations across multiple business systems. Implementing queue-based processing for high-volume asynchronous workflows. Improving resilience through retry logic, circuit breakers and fault-tolerant design. Monitoring system performance and proactively identifying opportunities to improve reliability and scalability. Collaborating with engineers, product teams and operational stakeholders to deliver high-quality solutions. Contributing to engineering best practice through code reviews, mentoring and knowledge sharing. What We're Looking For Essential Around 4+ years' commercial experience in backend software development using a strongly typed language. Experience integrating business-critical platforms with ERP, warehouse management or finance systems. Strong SQL skills, including performance optimisation and database design. Solid understanding of software architecture principles including SOLID, Clean Architecture and Domain-Driven Design. Experience with modern engineering practices such as CI/CD, automated testing and Git. Hands-on experience with Docker and containerised applications. Experience working with message queues and event-driven architectures. Strong communication skills with the ability to work closely across technical and non-technical teams. Desirable Experience working with AWS or other cloud platforms. Kubernetes or container orchestration experience. Exposure to GraphQL. Experience using AI-assisted development tools. Knowledge of secure software development and data protection best practices. Experience working within fast-paced, high-transaction or high-availability environments.You'll be joining a collaborative engineering team where your work has genuine impact. The organisation is investing in technology, modern engineering practices and cloud infrastructure, giving you the opportunity to work on technically interesting projects while continuing to develop your own skills. If you're looking for a role where you can solve challenging technical problems, work alongside talented engineers and build systems that operate at scale, we'd love to hear from you. Interviews Immediately. TPBN1_UKTJ