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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 HTTP 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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