Backend Systems Engineer - Scalable Integrations

Candour; Liverpool; On-site; GBP 55,000 - 75,000; Full time

Job summary

Candour is seeking an experienced Backend Systems Developer to design, develop and optimize backend integrations that connect customer-facing apps with warehouse, ERP and finance systems.

You will build scalable middleware, REST APIs and event-driven flows, handling high-volume data while ensuring reliability and security. Collaboration with product and operations teams is essential in delivering robust, scalable solutions.

Qualifications

• 4+ years of backend software development experience.
• Experience integrating systems with ERP/warehouse/finance platforms.
• Strong SQL with database design and performance optimisation.
• Knowledge of SOLID, Clean Architecture and DDD principles.
• Familiarity with CI/CD, automated testing and Git workflows.
• Hands-on with containerised apps (Docker).
• Experience with message queues and event-driven architectures.
• Cloud exposure (AWS or similar) and container orchestration knowledge.
• Exposure to GraphQL and AI-assisted development tools.
• Secure development and data protection practices.

Responsibilities

• Design, develop and maintain backend integrations between platforms and core systems.
• Build scalable middleware to support order processing and data exchange.
• Create and maintain REST APIs and event-driven integrations.
• Implement queue-based processing for high-volume workloads.
• Improve reliability via retry mechanisms and fault-tolerant design.
• Collaborate with engineers, product teams and stakeholders.
• Contribute to engineering standards, code reviews and mentoring.
• Develop cloud-ready services with clean, scalable architecture.
• Monitor performance and identify reliability improvements.

Skills

Backend development

SQL proficiency

Software architecture

CI/CD & testing & Git

Event-driven architectures

Cloud concepts (AWS)

GraphQL exposure

AI-assisted development tools

High-availability systems

Stakeholder collaboration

Education

Tools

Docker

Kubernetes

AWS

CI/CD tooling

Git

Job description

Candour is seeking an experienced Backend Systems Developer to design, develop and optimize backend integrations that connect customer-facing apps with warehouse, ERP and finance systems.

You will build scalable middleware, REST APIs and event-driven flows, handling high-volume data while ensuring reliability and security. Collaboration with product and operations teams is essential in delivering robust, scalable solutions.