Freelance Mainframe Software Engineer Jobs in Massachusetts

Whatyou'lldiscover

• We offer an inclusive culture and growthopportunities!

• Global IT Organization which collaborates across U.S., Canada, Europe, and Australia; clickhereto learn more!

• Challenging, collaborative, and team-based environment.

Whatyou'lldo

The Merchandising Solution Delivery organizationmanagesthe MerchandiseInventory andMarkdownsoftware and systems thattrackwhere millions of products will move around the globe to our stores each day. Our team thrives on strong relationships with our business partners andis workingdiligently to address their needs which support TJX growth and operational stability. On this tightly knit and fast-paced solution delivery team you will be constantly challenged to stretch andthink outside the box.

• Experience of authoring functional/technical designs documents including performance,securityand availability considerations

• Proven experience of developing new features and services that are medium tohigh levelof complexity working with the Product, Platform, Infrastructure and Security teams

• Proven ability to design, code, test, deploy & support working software/technology components, working collaboratively with architects and other engineers

• Experience in delivering clean, secure, performant code / technology components that meets all non-functional requirements

• Experience in leading discussions on design approaches to solving highly visible,strategicand complex business problems

• Experience inestablishingdevelopment process definitions, bestpracticesand standards

• Experienceidentifyingemerging technologies for consideration fornew technologydirection and implementing proof of concepts to prove thenew technology

• Proven ability to create Threat Model, Architecture, Estimates, Design, Code,and deliverfor the required business feature

• Experience of acting in a Lead Engineer capacity formedium to largeinitiatives, prioritizing and assigning tasks, providingguidanceand resolving issues

• Proven ability to mentor more junior engineers across the technical domains/enterprise

Whatyou'llneed

Our team is looking for people with a passion for technology, intellectual curiosity, and willingness to try new things to drive better solutions and get results. We want creative people thatpossessstrong interpersonal skills todemonstrateleadership by example, not authority, and who can foster an inclusive environment where everyone feels heard.

We areseekinga motivated, talented, experienced Staff Engineer who has deepMicrosoft .NETDevelopmentknowledge and experience to design and implement business functionality in their assigned Platforms / Products using and creatingDevSecOpsbest practices. We want people thatcan support and lead the technical strategy in their product team and communicateeffectively withtechnical and non-technical associates.

MinimumExperience

• 10+ years of handson software development experience focused on the Microsoft .NET ecosystem (C#, .NET Framework, .NET Core).

• Extensive experience designing, developing, andoptimizingSQL Server databases, including complex queries, stored procedures, indexing strategies, and performance tuning.

• Ability to work with mainframe SMEs toreverse-engineerlogic and map it into modern .NET domain models.

• Ability to read,analyzeand interpretMainframe code such as COBOL, JCL,VSAMand DB for z/OS schemas.

• Experienceextracting and transforming data from MainframeDB2 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 systemmodernizationprojects.

• Proventrack recorddelivering highquality, 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 endtoend 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.

DesirableExperience

• Experiencewith cloud platforms (Azure preferred), including App Services, Functions, Key Vault, APIM, and cloudnative design patterns.

• Familiarity with modern frontend technologies (e.g., Angular, or Blazor)

• Experience with Entity Framework, LINQ, microservices architectures

• Extensive experience with SQL Server Integration Services (SSIS), including designing,optimizing, and supporting complex ETL processes, data workflows, andintegration ofpipelines.

• Experiencewithtools such as Git, Azure DevOps, SonarQube, or similar development andDevSecOpstools.

• Experience with performance profiling, debugging, and monitoring .NET and SQL Server applications in production environments.

• Knowledge ofthe automationtools (e.g.REXX, Python) is preferable.

• Experience mentoring engineers of varying levels, elevating engineering maturity, shaping development processes, and championing bestinclass development practices (CI/CD, testing strategies, code quality).