Sr. Backend Developer

As a Sr. Backend Engineer you will: Architect and develop high-performance backend services using NestJS, ensuring scalability and maintainability Design and optimize PostgreSQL database schemas and query performance Implement complex business logic and integration patterns for financial service workflows Create and maintain RESTful APIs with exceptional performance characteristics Develop robust data modeling strategies that support complex financial service configurations Lead backend system design and technical decision-making Leverage AWS cloud services to build scalable and reliable infrastructure Mentor junior engineers and contribute to the overall engineering team culture Implement comprehensive testing strategies, including unit and integration testing Establish and maintain backend observability and monitoring infrastructure Collaborate closely with frontend, product, and design teams to ensure seamless system integration You'll be a great fit if you have: 7+ years of professional JavaScript development experience 7+ years of professional Node.js development experience Extensive experience with NestJS framework 6+ years of professional experience with PostgreSQL and relational database design Fluency in English & Spanish (Must). The team primarily communicates in Spanish, so strong written and verbal Spanish skills are essential. Proven track record of designing scalable, high-performance backend systems Deep understanding of TypeScript and advanced JavaScript patterns Strong experience with RESTful API design and implementation Expertise in database optimization and performance tuning Comprehensive knowledge of backend testing methodologies Substantial AWS cloud services experience, including: Amazon EC2 Amazon RDS AWS Lambda Amazon S3 AWS CloudWatch Infrastructure as Code (CloudFormation or Terraform) Experience with microservices architecture Strong debugging and systems troubleshooting skills Bonus points if you have: Knowledge of the financial services domain CI/CD pipeline configuration experience Docker experience Message queue systems (RabbitMQ, Kafka) experience Backend observability tools experience Need only Argentina candidates who speak both fluent English and Spanish