Fullstack developer (angular js)

TG connects thousands of auction houses, listing millions of items worth over $15 billion annually (and growing!), We help auctioneers sell everything from medieval swords to combine harvesters, paintings and decorative art through to classic cars, furniture, and Caterpillar forklifts. We do this through 8 marketplaces that leverage our online auction technologies. we make small companies big by bringing them access to millions of bidders they could never find on their own, and we bring them technology they could never afford alone. And we do it all in a shared success model that accelerates growth of the circular economy and sustainable buying. We have ethical ambition and it's something our employees value and is a key part of who we are....as well as being a high growth marketplace company with excellent competitive positioning! As a Senior Full Stack Software Engineer at ATG, you will be part of a collaborative agile team focused on delivering high-value, high-performance solutions across both customer-facing web applications and the services that power them. You will work across modern React and Type Script front ends and C#/. NET Core backend systems, building scalable, reliable software for a high-transaction e-commerce platform.You understand that quality is everyone's responsibility. You will work closely with Product, Design, QA, SDETs, and Engineering teammates to design, build, test, deploy, and support meaningful enhancements that improve the customer experience and strengthen the platform behind it. By giving millions of items second, third, and even infinite lives, we are accelerating the growth of the circular economy and creating a new global channel of sustainable commerce.Design, develop, test, deploy, and support full stack features and systems.Build modern user experiences using React and Type Script.Design and implement high-performance, scalable backend services using C# and. NET ntribute to engineering standards and patterns that improve performance, maintainability, reliability, and developer productivity.Write unit and other automated tests as part of a quality-first engineering culture.Work with SQL and relational databases to design, query, and optimize data access patterns.Pair program, review code, and support teammates in raising the quality bar across the team.Partner effectively with QA and SDETs to support robust end-to-end test coverage where appropriate.Bachelor's degree in computer science or related field, or equivalent technical experience.~5+ years of total software development experience, preferably as a full stack developer.~3-5 years of experience building production systems with C# and. NET.~3-5 years of experience building modern React and Type Script applications.~ Experience with complex, service-based architectures, queues, and high-availability, high-performance systems.~ Strong experience writing unit tests and contributing to automated quality practices.~ Strong experience with SQL and relational databases.~ Strong ability to debug issues across the full stack, from UI through services and data layers.~ Experience writing automated tests in Playwright with Type Script and/or supporting SDETs in creating and maintaining those test suites.Familiarity with AI tools, agentic AI workflows, MCPs, and agent orchestration.