Senior Software Engineer
Haystack
hybridseniorpermanentfrontend United States 64 days ago via LinkedIn
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ReactTypeScriptReduxCSSWeb AccessibilityWCAG 2.1Front-end ModernizationState ManagementHigh-Traffic WebAPI/Backend Traceability
About the role
Role Overview
Join a team building the payment platform powering guest checkout and payment experiences at massive scale.
Responsibilities
- Build and ship features across guest-facing checkout and payment flows used by millions.
- Modernize a large, mature frontend codebase, including migrating legacy state-management patterns to current standards.
- Take payment features from design through launch on high-traffic consumer surfaces.
- Ensure accessibility standards are met (WCAG 2.1 AA) for all shipped products.
- Read backend code and trace features end-to-end from UI through underlying services.
Requirements
- 7–10 years building production web frontends with React and TypeScript.
- Deep Redux experience, including refactoring or migrating large, established Redux codebases.
- Strong CSS and layout fundamentals, with a proven record of shipping accessible UI meeting WCAG 2.1 AA.
- Ability to ramp up quickly on large, unfamiliar codebases.
Nice to Have
- Experience collaborating in distributed, async teams (implied by the team setup).
About Haystack
Haystack works with companies in fintech to build systems that power how guests pay for services. The role focuses on checkout, payment methods, and guest-facing user experiences at large scale.
Scraped 7/21/2026