EFINTI is looking for a Backend Lead to drive the architecture and technical excellence of our backend services powering next-generation financial products across Latin America.

You will lead the design and development of scalable, secure, and event-driven microservices, working closely with cross-functional teams in a dynamic and fast-paced fintech environment.

What You'll Do

Design, develop, and maintain scalable backend microservices using Node.js + TypeScript
Lead technical architecture using DDD, Clean Architecture, and microservices principles
Collaborate with Frontend, Product, DevOps, and Security to translate business needs into robust technical solutions
Define and maintain API contracts, data models, and versioning strategies
Implement automated testing strategies: unit, integration, and contract testing (Jest, Pact)
Apply Security by Design principles and ensure compliance with OWASP, PSD2, PCI-DSS, and GDPR
Optimize performance using caching, pagination, parallelism, retries, and circuit breakers
Integrate observability tools such as Datadog, Prometheus, OpenSearch, or Grafana
Co-own CI/CD pipelines with DevOps using Terraform, GitHub Actions, Docker, and AWS services like Lambda, EKS, RDS, API Gateway
Mentor junior engineers and contribute to a culture of excellence and technical growth

What We're Looking For

7+ years in backend development with strong expertise in Node.js, TypeScript, NestJS/Express
Hands-on experience with microservices, event-driven systems, DDD, and CQRS
Advanced knowledge of PostgreSQL, DynamoDB, and Redis
Strong AWS experience: Lambda, S3, IAM, RDS, EventBridge, CloudWatch
Experience defining infrastructure with Terraform and building pipelines with GitHub Actions or GitLab CI
Strong understanding of OAuth2, JWT, secret management, and secure coding practices
Experience with testing automation (unit, integration, contract)
Comfortable in agile environments, working cross-functionally in English
Excellent communication and mentoring skills