Come Back Agency is a rapidly growing company in the digital field, specializing in developing brands, creating web projects, and designing mobile applications. We are looking for a skilled and motivated NestJS Backend Engineer to join our international team.

US schedule. Working hours from 04:00 pm to 00:00 am EET;

Must-Have Qualifications

• 2+ years professional experience with TypeScript and NestJS (modules, providers, pipes, guards, interceptors).
• Strong OOP/SOLID understanding and clean architecture (layered/hexagonal).
• PostgreSQL with Prisma or TypeORM; confident with migrations, schema design, and query performance.
• Secure auth: JWT, bcrypt, refresh tokens, RBAC/permissions.
• Real-time features via Nest WebSockets (Gateways), rooms, presence, backpressure basics.
• REST API design & implementation; documentation with Swagger/OpenAPI.
• Event-driven systems: Redis and a broker (RabbitMQ or Kafka) for queues/pub-sub, retries, idempotency.
• Object/file storage: AWS S3 (presigned uploads, lifecycle, ACL/CDN).
• Email delivery with SendGrid (templates, sender auth, webhooks).
• Webhooks: designing and consuming webhook integrations (signature verification, replay protection, retries, idempotency, security best practices).
• Scheduling/cron with nestjs/schedule or Bull/BullMQ for jobs/workers.
• Microservices with NestJS (message transports), API Gateway patterns, service boundaries.
• Code quality: ESLint/Prettier, Jest unit/integration tests, basic CI.
• Clear written communication in English.
  

Nice to Have (Desired)

• OpenAI API, Discord API.
• Docker (multi-stage builds, docker-compose for local dev).
• Google APIs (OAuth 2.0, Drive/Gmail/Maps) with token refresh/quotas.
• Upwork integration (public/private APIs, webhooks).
• Server-side templating: EJS or Handlebars (HBS).
• Observability: structured logging, metrics, tracing (OpenTelemetry).
  

Responsibilities

• Design and ship scalable NestJS services and REST APIs with clean module boundaries.
• Implement real-time features with WebSockets and background processing with queues.
• Own data models and PostgreSQL migrations; monitor and tune performance.
• Build and maintain secure webhook endpoints (HMAC signatures, replay protection, retries, DLQs).
• Integrate external services (S3, SendGrid, Google APIs, marketplaces) reliably and securely.
• Document endpoints with Swagger, maintain tests with Jest, and uphold code standards (ESLint/Prettier, reviews).
• Contribute to a microservices setup (broker, API Gateway, resilience/circuit breakers).
  

We Offer:

• Fixed salary in USD;
• Flexible work schedule;
• Professional growth and support from experienced colleagues;
• Supportive leadership with minimal bureaucracy;
• English language lessons to boost your communication skills.