Senior Node.js Engineer

About the Role We are seeking a Senior Node.js Engineer in Buenos Aires to lead backend development for BFF (Backend-for-Frontend) services and microservice-based systems. You will design, build, and maintain scalable, reliable services, collaborating with product and frontend teams, and driving technical improvements across the stack. This is a full-lifecycle role—from technical scoping and prototyping to implementation, testing, deployment, and support.

What You'll Do

• Design and maintain BFF and backend services with Node.js (18+) and NestJS
• Build and document versioned RESTful APIs
• Integrate within microservices and event-driven systems
• Translate requirements into prototypes and production-ready technical solutions
• Ensure code quality: unit tests, code reviews, and defect fixes
• Deploy and manage cloud applications using IaC or Serverless approaches
• Ensure production reliability with monitoring, alerting (e.g., DataDog, OpsGenie), and incident response
• Improve performance, scalability, and availability
• Maintain functional, architectural, and in-code documentation
• Collaborate with frontend, product, and tech leads; support team OKRs and mentor juniors

What We're Looking For

• 5+ years with Node.js (v18+); experience building BFF/back-end services with NestJS or Express
• Strong RESTful API design and NoSQL integration
• Experience with microservices and event-driven/asynchronous architectures
• Cloud deployment and management experience; familiarity with Serverless Framework or IaC tools
• Proficient with GitLab workflows and setting up monitoring/alerting (Datadog, OpsGenie)
• Solid technical scoping, requirements translation, and full SDLC ownership
• Excellent collaboration and communication; works closely with TL and PO to meet deadlines
• Languages: Spanish (native), English (intermediate)
• Location: Buenos Aires (CABA or AMBA)

Nice-to-Have

• Experience with AWS serverless (Lambda, API Gateway, SQS/SNS, Step Functions, EventBridge, DynamoDB)
• TypeScript proficiency
• Frontend (React) experience
• Familiar with agile SDLC

Compensation & Benefits

• Salary information not disclosed in the posting
• Avenga is an equal-opportunity employer; we promote diversity and inclusive growth across teams
• Hybrid work arrangement in Buenos Aires; global collaboration with teammates across locations