Senior Fullstack Developer (Node.js + React) - CRM
New
Fully remote, 10:00–18:00 (UK time)ContractSenior
Salary120 - 160 PLN per hour
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Job Details
- Languages
- English C1, Polish B2
- Experience
- Minimum 5 years
- Required Skills
- Node.jsTypeScriptReactHubSpot
Requirements
- Minimum 5 years of professional experience as a Fullstack Developer
- Very strong knowledge of React
- Very strong knowledge of TypeScript
- Solid experience with Node.js
- Solid experience with API development
- Hands-on experience with webhooks
- Hands-on experience with system integrations
- Ability to read, understand, and extend existing backend codebases
- Practical experience using Claude Code or similar AI-assisted coding tools
- English proficiency at C1 level
- Polish proficiency at B2 level or higher
Responsibilities
- Design and develop a new custom module within an existing HubSpot application
- Build user-facing interfaces for internal HubSpot users
- Implement a management panel for customer trials and licenses
- Integrate the application with existing internal APIs
- Identify and implement missing backend functionalities
- Develop integration code in Node.js connecting LMS webhooks with the authentication system
- Automate user account creation based on LMS-triggered events
- Automate user roles and permissions assignment based on learning system data
- Ensure data consistency, reliability, and observability across systems
- Handle error management, retries, and monitoring of webhook-based flows
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