Frontend Developer

Circadence; Boulder (CO); On-site; USD 80,000 - 110,000; Full time

Job summary

A leading cybersecurity training firm in Boulder, Colorado, seeks a frontend engineer to enhance their web interfaces. This role involves building and shipping features with React and TypeScript, ensuring high quality and accessibility. Ideal candidates should have strong skills in HTML, CSS, and JavaScript, alongside proficiency in Git and modern frontend tools. Collaborating closely with design teams, you will translate specs into reusable components and improve performance as part of a dynamic engineering team.

Qualifications

• Experience building accessible, responsive UIs with performance in mind.
• Strong experience with CSS best practices and component libraries.
• Proficient in Git and modern frontend tooling.

Responsibilities

• Build and ship user-facing features with React + TypeScript.
• Collaborate with Product Design on responsive components.
• Integrate with REST APIs and handle data/state elegantly.

Skills

HTML

CSS

JavaScript

React

TypeScript

Git

SASS

Agile methodologies

Tools

Vite

ESLint

Vitest

Cypress

Testing Library

Job description

We’re building fast, reliable, and accessible web experiences that turn complex workflows into intuitive UIs in cybersecurity training. You’ll own meaningful slices of our front-end stack. You know when features are ready to ship. You will work closely with stakeholders to deliver product value end-to-end. We’re looking for an engineer who brings attention to detail, strong HTML, CSS, and JS experience, and a collaborative mindset to help us deliver reliable, high-quality UI.

Responsibilities - What you’ll do:

• Build and ship user-facing features with React + TypeScript, from idea → PR → production, emphasizing reliability, performance, and accessibility.
• Collaborate with Product Design to translate Figma specs into responsive, reusable components that align with our design system.
• Integrate with REST APIs, shape API contracts with backend partners and handle data/state elegantly (e.g., React Query, Redux, or Zustand).
• Improve performance (bundle size, code-splitting, memoization, virtualization) and accessibility (WCAG, semantic HTML, ARIA) as part of everyday work.
• Write robust tests (unit, component, and integration with Vitest/RTL/Cypress) and participate in code reviews to raise the quality bar.
• Contribute to our component library and documentation; advocate for consistency, DX, and maintainability.
• Partner with PM/Design to break down work, estimate work, and collaborate on best practices for Agile

Required Qualifications

• Experience building accessible, responsive UIs with performance in mind.
• Proficiency with Git, PR workflows, and modern frontend tooling: Vite, ESLint, and type-aware linting.
• Strong experience with CSS best practices, SASS, and component libraries
• A pragmatic testing mindset—you test what matters and keep it maintainable (we use Playwright for e2e and Testing Library where we add unit tests).
• Strong collaboration and communication skills—you seek clarity, share context, and ship.

Preferred Qualifications

• Experience with interactive canvas or graph UIs (e.g. React Flow / XY Flow), drag-and-drop, or diagram-style interfaces.
• Familiarity with Django REST (or similar) backends and session-based auth from the frontend.
• Latest LLM tooling

How we work

• Tooling: React, TypeScript, Vite/Webpack, Jest, React Testing Library, Cypress, Storybook.
• Collaboration: Teams, Linear/Jira, Figma, design reviews, weekly demos, and blameless post-mortems.
• Quality: CI on every PR, peer reviews, feature flags, and progressive delivery.