Senior Backend Engineer — Scale Fintech Payments

Cashea; Buenos Aires; Híbrido; ARS 135.820.000 - 196.185.000; Jornada completa

Descripción de la vacante

Cashea is hiring a Senior Backend Engineer who owns systems end-to-end. You will design and build scalable backend services in Node.js and NestJS, create high-performance RESTful APIs, and ensure financial correctness with idempotency, reconciliation, retries, and clear failure states.

You’ll work with Product and other engineers to shape how our platform scales as we grow. You will model relational data in PostgreSQL, make architectural decisions, own production deployments, and mentor

Formación

• Bachelor's degree in Computer Science or related field.
• 5+ years backend development with Node.js and NestJS.
• Proven experience designing and operating RESTful APIs in production.
• Advanced knowledge of relational databases, preferably PostgreSQL.
• Experience writing unit and integration tests, and treating quality as part of delivery.
• Strong grasp of design principles and architectural patterns.
• Track record of shipping features independently and owning service performance.
• Ability to communicate complex technical concepts clearly, and to mentor others effectively.
• Excellent problem-solving and analytical thinking, with genuine curiosity about new technology.

Responsabilidades

• Design and build robust, scalable backend services in Node.js and NestJS (Express).
• Create and maintain high-performance RESTful APIs for cross-team use.
• Build for financial correctness — idempotency, reconciliation, retries, and defined failure states.
• Model and manage relational data, primarily in PostgreSQL, with performance in mind.
• Make architectural and system-design decisions, owning the trade-offs.
• Ensure optimal service performance and own production deployments end-to-end.
• Raise the engineering bar through code reviews, pairing, and standards.
• Mentor engineers and lead technical discussions to strengthen the team.
• Move fast across multiple workstreams in a dynamic startup environment.

Conocimientos

Node.js

NestJS (Express)

RESTful APIs

PostgreSQL

Unit & integration testing

Architectural design

Production deployments

Mentoring

Communication

Problem-solving

Educación

Bachelor's degree in Computer Science or related field

Herramientas

Google Cloud Platform

Docker

Kubernetes

RabbitMQ/Kafka/Pub/Sub

Descripción del empleo

Cashea is hiring a Senior Backend Engineer who owns systems end-to-end. You will design and build scalable backend services in Node.js and NestJS, create high-performance RESTful APIs, and ensure financial correctness with idempotency, reconciliation, retries, and clear failure states.

You’ll work with Product and other engineers to shape how our platform scales as we grow. You will model relational data in PostgreSQL, make architectural decisions, own production deployments, and mentor