Senior Full Stack Developer

Summary

Join Instrumental Group, a growing international digital agency, as a Senior Full Stack Developer. This role requires a strong foundation in front-end and back-end development using modern JavaScript. While HubSpot CMS and CRM experience is a plus, it's not required; training will be provided. You will build and maintain projects using React and Node.js, develop serverless functions, and create HubSpot CMS themes and CRM UI extensions. The ideal candidate is passionate about innovation and has 5+ years of professional full-stack JavaScript development experience. This is a great opportunity to grow your career within a fast-growing, HubSpot-focused agency.

Requirements

• 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

Responsibilities

• 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

Preferred Qualifications

• 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)

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