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**