Senior Node.js Developer for Auth Service Build

Keystone Digital

Contract · Remote · Flexible hours

About the role

Keystone Digital is expanding a multi‑tenant B2B product and needs a Node.js developer to deliver core tenant isolation features. You will work closely with product owners and QA to translate requirements into clean, scalable code while ensuring high performance across all tenants.

Key responsibilities

• Design and implement multi‑tenant APIs using Node.js and Express
• Build robust REST endpoints that handle tenant‑specific data segregation
• Write unit and integration tests to guarantee reliability
• Collaborate with front‑end teams to define contract specifications
• Monitor and optimise performance in a cloud environment

Must-have skills

• 5+ years of Node.js development
• Deep experience with Express and REST API design
• Strong JavaScript (ES6+) proficiency
• Understanding of multi‑tenant architecture patterns
• Familiarity with version control and CI/CD pipelines

Nice to have

• Experience with Docker or Kubernetes
• Knowledge of PostgreSQL or MySQL scaling
• Background in B2B SaaS platforms