Billor

Backend Engineer

• Design and evolve domain APIs in NestJS/TypeScript following a strict layered architecture: thin controllers, business logic in the service layer, data access isolated in repositories.
• Build event-driven communication between services with Pub/Sub, using patterns like transactional outbox and idempotent consumers to guarantee reliability.
• Model and optimize PostgreSQL schemas and queries — proper types, indexing, and normalization decisions (when a field should really be a related table).
• Use Redis for caching and session data, with deliberate TTL and invalidation.
• Design clean, versioned REST contracts (plural resources, correct HTTP verbs and status codes, standardized JSON response envelopes).
• Implement authentication and authorization (SSO/JWT via a central gateway), always revalidating permissions on the server — never trusting the client.
• Collaborate with front-end/BFF engineers on typed, contract-first API interfaces.
• Write unit and integration tests as a first-class part of delivery.
• Participate in code and architecture reviews, and help make (and document) sound architectural decisions.

Billor

Senior Software Engineer – Backend

Mid Level Software Engineer – Backend