Senior Full Stack Web Developer for E-commerce Platform Delivery

Keystone Digital

Freelance · Remote · Flexible hours

About the role

We are launching an integration project that ties together our billing system, CRM, and several internal APIs. You will own end‑to‑end development of the data flow, ensuring secure, real‑time sync across platforms while keeping the UI intuitive for internal users.

Key responsibilities

• Design and implement RESTful services to connect billing, CRM, and internal APIs
• Build responsive React dashboards for monitoring integration health
• Write clean, testable NodeJS code and manage MongoDB schemas
• Collaborate with product and ops teams to define data contracts
• Set up automated CI pipelines and monitor performance metrics

Must-have skills

• Strong experience with React, NodeJS, and JavaScript
• Proficient in MongoDB data modeling and queries
• Hands‑on integration work with third‑party APIs and webhooks
• Understanding of authentication, OAuth, and secure data transfer

Nice to have

• Familiarity with Docker or container orchestration
• Experience in automated testing frameworks (Jest, Mocha)
• Knowledge of cloud services (AWS, GCP) for scaling integrations