Senior Software Engineer
Haystack
hybridseniorpermanentfrontend United States 65 days ago via LinkedIn
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ReactTypeScriptReduxFrontendWeb AccessibilityWCAG 2.1 AACSSCheckout FlowsPayment UXDistributed Team
About the role
Role Overview
Join a distributed, async team working on high-impact, user-facing payment systems. You’ll build and modernize frontend checkout and payment experiences used by millions of people.
Responsibilities
- Build and ship features across guest-facing checkout and payment flows.
- 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 (WCAG 2.1 AA) are met for all shipped products.
- Trace features end-to-end by reading backend code and following UI behavior into the services behind it.
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.
- Proven track record shipping accessible UI to WCAG 2.1 AA.
- Ability to ramp up quickly on large, unfamiliar codebases.
Nice to Have
- Experience collaborating on payment UX and coordinating delivery from design to launch in consumer environments.
About Haystack
The company builds the backend systems that power how guests pay for services, with a focus on checkout, payment methods, and guest-facing experiences. It develops high-traffic consumer payment platform technology, combining frontend user flows with underlying payment and service infrastructure.
Scraped 7/20/2026