Senior Back-End Software Engineer Location: West Yorkshire Hybrid, 2 days a week in the office Salary: £50,000-£62,000 bonus benefits bonus and excellent benefits We are looking for a Senior Back-End Software Engineer to design, develop, and maintain secure, scalable, and high-performance back-end services for a B2C e-commerce platform. Key Responsibilities: Develop and maintain robust, scalable, and secure back-end services for e-commerce applications. Build and optimise RESTful and SOAP APIs for seamless integration with front-end applications and third-party platforms (PIM, payment services, ERP, CRM). Work closely with front-end engineers and digital teams to support key e-commerce functionalities, including product search, checkout, order tracking, and customer authentication. Collaborate with DevOps engineers to integrate CI/CD pipelines and monitoring tools for performance optimisation. Implement and support caching mechanisms and performance enhancements to improve response times. Ensure security best practices for authentication, authorisation, and data protection in compliance with UK regulations (UK-GDPR, PCI-DSS). Stay up to date with emerging technologies and best practices in e-commerce back-end development. What We’re Looking For: Proven experience in building back end high-traffic, transactional e-commerce platforms. Strong expertise in C# / Java /.NET, and database technologies (MS SQL, SSRS, SSIS, Oracle Endeca). Experience in API development (SOAP, RESTful, LDAP) using XML/JSON for seamless third-party integrations. Strong understanding of secure coding practices (OWASP), authentication protocols (OAuth2, JWT), and encryption techniques. Experience integrating payment gateways (e.g., Cybersource). Desirable: Knowledge of digital marketing (SEO, CRO, personalisation) and digital merchandising (search, recommendations, taxonomy management). Experience with Agile methodologies (Scrum, Kanban) and CI/CD pipelines (GitLab, Jenkins, Selenium). Strong understanding of caching strategies, load balancing, and performance optimisation techniques.