Senior Full Stack Developer (React, Node.js, JS & CSS)
About The Position
Join Instrumental as a Senior Full Stack Developer. This is a Remote or Hybrid Full-Time role within a growing international digital agency. We are looking for 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. This is a hands-on, fast-paced development role where you will build modern web applications, custom HubSpot solutions, and scalable backend systems. You will work closely with designers, strategists, and other developers to deliver high-quality digital experiences.
Requirements
- 5+ years of professional full-stack JavaScript development experience
- Strong proficiency in React.js and state management (Redux, Zustand, Context API, etc.)
- Solid experience with Node.js (Express, serverless functions, API development)
- Strong understanding of modern CSS (SCSS, Tailwind, CSS-in-JS, Grid, Flex, etc.)
- Experience working with APIs and data fetching (Axios or similar)
- Strong Git workflow experience (branches, pull requests, code reviews)
- Willingness to learn HubSpot CMS and CRM development
Nice To Haves
- Experience with HubSpot CMS and HubL
- Experience building HubSpot CRM UI Extensions
- Familiarity with GraphQL and REST APIs
- Experience with other CMS platforms (WordPress, etc.)
- Experience with backend languages (Python, PHP, Go, Elixir)
- Experience with databases (PostgreSQL, MongoDB, Firebase, Supabase, MySQL, Convex)
- Experience deploying apps to Vercel, Netlify, Render, or DigitalOcean
- Spanish fluency
Responsibilities
- Build and maintain applications using React and Node.js
- Develop HubSpot CRM UI Extensions and interactive front-end components
- Create serverless functions and custom-coded workflow actions using Node.js
- Develop and maintain HubSpot CMS themes, templates, and modules (training provided if needed)
- Ensure high-quality, performant, and accessible web experiences
- Work within project management tools (ClickUp, Jira, Asana, or Teamwork), Slack, and GitHub
- Collaborate with designers and strategists to translate requirements into technical solutions
- Stay current with modern web technologies and best practices
Benefits
- Comprehensive medical, dental, and vision insurance
- Short-term and long-term disability coverage
- Accident insurance for additional peace of mind
- 401(k) retirement plan
- 15 paid holidays
- Generous PTO
- Quarterly incentive plan
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What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
No Education Listed
