REST API Developer – Mission-Critical API Design

Vertex Analytics

Freelance · Remote · Flexible hours

About the role

Vertex Analytics is orchestrating a critical integration effort that links its billing platform, CRM system, and several internal services. We need a REST API Developer who can design, implement, and fine‑tune the connective layer while ensuring data consistency and low latency.

Key responsibilities

• Design and develop secure RESTful endpoints for billing and CRM interactions
• Map and transform data between PostgreSQL stores and external APIs
• Implement authentication, rate‑limiting, and error‑handling patterns
• Write automated tests and documentation for each integration point
• Collaborate with product owners to refine API contracts and performance targets

Must-have skills

• Strong experience building REST APIs with NodeJS
• Proficiency in JavaScript (ES6+)
• Hands‑on with PostgreSQL schema design and queries
• Understanding of OAuth2/JWT security flows

Nice to have

• Familiarity with billing platforms (e.g., Stripe, Chargebee)
• Experience integrating popular CRMs like HubSpot or Salesforce
• Knowledge of CI/CD pipelines for automated deployment