Kard · 2 hours ago
Sr Software Engineer (Frontend Focus, Brazil)
United States
Full-time
Remote
Senior Level
$80K/yr - $120K/yrKard is transforming customer loyalty with our rewards-as-a-service API platform. The role involves designing, building, and refining frontend systems for Kard's transaction-linked rewards platform, primarily using React and TypeScript.
Advertising PlatformsFinancial ServicesFinTechLoyalty Programs
Responsibilities
Design and implement frontend systems in React and TypeScript, with attention to performance, accessibility, and maintainability
Own the front of the frontend: design tokens, CSS architecture, and the tooling that makes styling scalable and consistent
Establish and evolve testing practices that catch real bugs without creating brittleness—favoring tests that support refactoring over tests that fight it
Contribute to backend services in Go, building APIs and integrations that support frontend needs
Collaborate with product, design, and engineering to shape features from early concept through delivery, building in narrow vertical slices that deliver value continuously
Drive frontend architecture decisions, balancing trade-offs between developer experience, optionality, performance, and business impact
Improve automation, CI/CD, and observability for frontend systems, enabling faster iteration and more reliable releases
Mentor engineers and establish standards—proposing them quickly, building consensus, shipping them, and evolving them thoughtfully when circumstances change
Qualification
Required
Expert-level React and TypeScript, with well-informed, contextualized opinions on ecosystem choices—when to reach for external state management, which patterns scale, what to avoid
Deep appreciation for the craft of frontend development: CSS (and tools for managing it), design systems, accessibility, and the details that make interfaces feel right
Strong linting and testing philosophy and practice—experience with Vitest, Playwright or Cypress, and an understanding of what makes frontend tests reliable rather than flaky. Bonus if you have thoughtful opinions on Visual Regression Testing
Comfort working within Docker, Terraform, and Kubernetes environments. You don't need to be a DevOps specialist, but you can be productive within established patterns
Experience building REST APIs, with an understanding of how frontend and backend responsibilities should be divided
Business-minded approach to engineering: you deliver in vertical slices, you understand why features matter, and you collaborate with product and design to shape outcomes—not just implement specs
Strong communication and collaboration skills, with experience working on small teams and mentoring other engineers
Proficiency with AI-assisted development tools like Claude Code—you see them as complementary to your expertise, guide them critically, and integrate them into your craft
Preferred
Experience with Go, or genuine interest in learning it
Background with GraphQL or Backend-for-Frontend patterns
Experience with mobile, especially Webview
Experience with Databricks, MongoDB, or PostgreSQL
Background in fintech, adtech, or transaction-based systems
Contributions to open-source projects or active participation in the frontend community
Prior experience in high-growth startups or scaling frontend infrastructure
Benefits
Flexible PTO, with a minimum requirement to take one day off a quarter, ten days a year, promoting mental well-being
Observance of 11 Federal Holidays, plus an additional day each for Black Friday and Christmas Eve (US employees only)
Health, Dental and Vision Insurance
401k with employer match (US employees only)
Coworking space and WFH setup reimbursement
Company Offsites two times per year for planning, team-building, and networking
Company
Kard
Kard is a rewards-as-a-service API that enhances customer loyalty programs.
Founded in 2016
51-200 employees
H1B Sponsorship
Kard has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
2023 (1)
Funding
Current Stage
Growth StageTotal Funding
$39.32MKey Investors
Trinity CapitalTiger Global ManagementTechstars
2025-10-21Series Unknown· $15M
2022-04-28Series A· $23M
2018-01-01Seed
Leadership Team
Ben Mackinnon
Founder & CEO
Recent News
2025-10-22
alleywatch.com
2025-10-22
Company data provided by crunchbase