Senior Full Stack Developer (React, Node.js, JS & CSS) Job at Instrumental Group, Golden, CO

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  • Instrumental Group
  • Golden, CO

Job Description

We are looking for a Senior Full Stack Developer to join our growing international digital agency. The ideal candidate is an ambitious and driven modern JavaScript developer with a strong foundation in front-end and back-end development. While we specialize in HubSpot CMS and CRM development , prior HubSpot experience is not required—we are willing to train the right person.

Who You Are

  • A modern JavaScript developer who writes clean, maintainable code.
  • Experienced in React and building dynamic front-end applications.
  • Familiar with Node.js and capable of writing serverless functions and custom backend logic.
  • Proficient in modern CSS techniques (e.g., Flex, Grid, @container, CSS custom properties, SCSS, Tailwind, etc.).
  • Comfortable working with Git-based version control and following best practices for collaboration.
  • Experienced in working with APIs (particularly using Axios for requests).
  • Passionate about innovation and experimentation , always looking for ways to improve and push the boundaries of modern development.
  • Interested in learning HubSpot development (CMS themes, Interactive tools, CRM UI extensions, and custom workflow actions).

What You’ll Do

  • Build and maintain projects using React and Node.js , including HubSpot CRM UI Extensions and interactive front-end components.
  • Develop serverless functions and HubSpot custom-coded workflow actions using Node.js .
  • Create and update HubSpot CMS themes, templates , and modules (after training if needed).
  • Create and update HubSpot CRM UI Extensions.
  • Ensure high-quality, performant, and accessible web experiences.
  • Work within project management tools (e.g., ClickUp, Jira, Asana, or TeamWork), Slack , and GitHub .
  • Stay up to date with modern web technologies and best practices.

Required Experience & Skills

  • 5+ years of professional development experience in full-stack JavaScript.
  • Strong proficiency in React.js and state management libraries (e.g., Redux, Zustand, or Context API).
  • Solid experience with Node.js (Express.js, serverless functions, API development).
  • Strong understanding of CSS best practices (SCSS, Tailwind, CSS-in-JS, etc.).
  • Experience working with APIs , particularly using Axios for data fetching and integration.
  • Experience with Git version control and team workflows (branches, pull requests, code reviews).
  • A willingness to learn HubSpot CMS and CRM development.

Bonus Experience (Not Required, But Nice to Have)

  • Experience with HubSpot CMS and HubL (or similar templating languages).
  • Experience developing HubSpot CRM UI Extensions .
  • Familiarity with GraphQL and REST APIs .
  • Some experience with WordPress (PHP) or other CMS platforms.
  • Experience with server-side languages such as Python , PHP , Go , or Elixir
  • Experience with database technologies such as PostgreSQL , MongoDB , SupaBase , Firebase , Convex , MySQL
  • Experience deploying small apps or microservices to modern cloud hosting platforms like Vercel, Netlify, Render, or DigitalOcean . If you've experimented with deploying side projects or prototypes online, that’s a big plus.
  • Fluent in Spanish (a plus but not required).

This is a great opportunity to join a fast-growing, HubSpot-focused agency and gain expertise in a leading digital experience platform. If you have modern JavaScript skills, a strong development mindset, and a passion for building and experimenting , we’re excited to train you on HubSpot’s ecosystem and help you grow in your career.

Our Benefits :

  • Comprehensive medical, dental, and vision insurance
  • Short-term and long-term disability coverage
  • Accident insurance to provide additional peace of mind
  • IRA/401(k) retirement plan to help you save for the future
  • 15 paid holidays each year to enjoy time with family and friends
  • Generous paid vacation policy to recharge and rejuvenate
  • Quarterly incentive plan
  • Instrumental Group was awarded Inc.’s Best in Culture for 2024! Join an award-winning culture that values collaboration, innovation, and excellence.

Corporate Vision

Instrumental Group is a growing international digital services agency helping clients in all industries scale with HubSpot. As a leading implementation partner, HubSpot customers turn to us for help with everything creative and technical. If you’re looking to join a fast-paced digital agency, and work in the latest programming technologies, we want to talk to you.

Ready to apply? Fill out the application!

Job Tags

Holiday work, Full time, Temporary work, Flexible hours,

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