Salary: £30,000 - 70,000 per year Requirements: 10 years of hands-on software development experience focused on the Microsoft .NET ecosystem (C#, .NET Framework, .NET Core). Extensive experience designing, developing, and optimizing SQL Server databases, including complex queries, stored procedures, indexing strategies, and performance tuning. Ability to work with mainframe SMEs to reverse-engineer logic and map it into modern .NET domain models. Ability to read, analyze, and interpret mainframe code such as COBOL, JCL, VSAM, and DB for z/OS schemas. Experience extracting and transforming data from mainframe DB2 and IMS. Hands-on experience designing and building data extraction pipelines from mainframe systems into modern platforms (SQL, cloud storage, APIs, microservices). Experience working on large-scale data migration or system modernization projects. Proven track record delivering high-quality, scalable, secure, and maintainable applications across medium to large projects. Strong understanding of application architecture principles, API design, and modern development practices such as dependency injection, CI/CD, unit testing, and code quality standards. Experience collaborating closely with Product, Platform, Infrastructure, and Security teams to design and implement end-to-end technical solutions. Ability to lead technical discussions, provide architectural input, and solve complex, highly visible business problems. Demonstrated experience mentoring junior developers and contributing to engineering best practices, standards, and development processes. Responsibilities: Manage the Merchandise Inventory and Markdown software and systems that track product movement globally. Develop strong relationships with business partners and address their needs to support TJX growth and operational stability. Author functional/technical design documents that consider performance, security, and availability. Develop new features and services of medium to high complexity in collaboration with various teams. Design, code, test, deploy, and support software/technology components collaboratively. Deliver clean, secure, and performant code that meets all non-functional requirements. Lead discussions on design approaches to solve complex business problems. Establish development processes, best practices, and standards. Identify emerging technologies and implement proof of concepts. Create Threat Models, Architecture, and Design documents for business features. Act in a Lead Engineer capacity for medium to large initiatives, prioritizing tasks and resolving issues. Mentor junior engineers across technical domains and contribute to their development. Technologies: .NET Framework API C# CI/CD Cloud COBOL Support SQL Security microservices ASP.NET Angular Azure Blazor DevSecOps DevOps ETL Frontend Git Python SSIS More: At TJX Companies, each day offers new opportunities for growth and achievement within our inclusive and collaborative culture. We are a Fortune 100 company and the worlds leading off-price retailer, operating in the U.S., Canada, Europe, and Australia across various brands including TJ Maxx, Marshalls, and Homegoods. Join our team as a Staff Engineer in the Merchandising Solution Delivery organization, where youll work in a dynamic environment that encourages creativity, discovery, and continuous learning. We offer a competitive salary and a comprehensive benefits package, including a 401(k) match, medical/dental/vision coverage, tuition reimbursement, and much more, all subject to eligibility terms. last updated 15 week of 2026