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

Job Description

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!

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Job Tags

Holiday work, Temporary work, Flexible hours,

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