Senior Frontend Engineer

About Kalder

We empower brands of all sizes to create Amex-like partner rewards programs that reward and monetize their top customers. Until now, only airlines, banks, and retailers had this power—we’re making it accessible to everyone.

Kalder is hiring a Senior Front-End Engineer to architect, design, and influence key engineering decisions for our rewards platform. You’ll own the front-end roadmap
, define guardrails and best practices, and turn complex financial workflows into fast, elegant, and accessible experiences across web and mobile.

Day-to-day, you’ll:

• Architect & Design
  :
  Define component libraries, set performance budgets, enforce testing standards.

• Ship End-to-End
  :
  Collaborate with product + backend to design and launch features.

• Mentor & Lead
  :
  Guide teammates, write docs and diagrams, and make architectural tradeoffs explicit.

• Push Standards
  :
  Ensure accessibility, responsiveness, and consistency across the product.

We care deeply about fundamentals, not just frameworks. You’re fluent in:

• Semantic HTML
  , modern CSS
  , and Typescript mastery

• State management, async data flows, security, and observability

• React and Next.js
  , while being pragmatic about frameworks (Tailwind, Radix
  
  UI)

• Building performant, elegant UIs that scale

• 6+ years of frontend development experience

• Proven expertise with React + Next.js (mobile + web)

• Strong foundation in component architecture and UI systems

• Experience working on complex, data-heavy, high-performance apps

• Startup-ready: you thrive in fast-moving, ambiguous environments

• Experience in fintech or rewards/loyalty products

• Contributions to open-source libraries or developer tooling

• A degree in Computer Science—or the equivalent hard-earned knowledge

• Manages Complexity – simplifies ambiguity into clear, actionable paths

• Situational Adaptability – flexes approach and demeanor to context

• Action-Oriented – brings urgency, energy, and ownership to challenges

🔥 This is a chance to shape Kalder’s front-end foundation and engineering culture while building the first rewards network of its kind.