Senior Frontend Software Engineer
Haystack
seniorpermanentfrontend United States 66 days ago via LinkedIn
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ReactTypeScriptMicro FrontendsRedux ToolkitReact QueryJestReact Testing LibraryOWASPSecurity RemediationFrontend Performance
About the role
Role Overview
You will develop and maintain enterprise React applications for critical business capabilities within a large, modernizing portfolio.
Responsibilities
- Develop and maintain enterprise React applications supporting key business functions.
- Build and enhance applications using a Micro Frontend architecture.
- Modernize legacy React code and refactor class-based components.
- Improve frontend performance, scalability, and maintainability across the portfolio.
- Remediate frontend security vulnerabilities and support secure development practices.
- Promote frontend engineering best practices and drive continuous improvement across teams.
- Collaborate with backend engineers, UX partners, and product teams.
Requirements
- Strong experience with React 18+ and TypeScript in large enterprise codebases.
- Deep knowledge of React Hooks, Context API, and custom hooks.
- Advanced TypeScript skills (e.g., generics and type-safe API integration).
- Experience with state management such as Redux Toolkit and/or React Query.
- Proficiency with Jest and React Testing Library for component/unit testing.
- Familiarity with secure frontend development practices and OWASP guidance.
What’s Offered
- Opportunity to work in a complex, dynamic enterprise environment.
- Join a team responsible for maintaining, modernizing, and evolving a large application portfolio.
- Contribute to significant refactoring efforts and help shape frontend engineering best practices.
About Haystack
Haystack partners with enterprise organizations to help modernize and scale their technology solutions, including large-scale frontend ecosystems. This role is with a Fortune 50 retail leader focused on delivering secure, high-quality user experiences across critical business functions.
Scraped 7/19/2026