Senior Node.js Engineer

Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets.

At the core of the role

In Argentina (Buenos Aires), we are seeking a Senior Node.js Engineer to join our engineering team and lead backend development for BFF (Backend-for-Frontend) services and microservice-based systems. You will design, build, and maintain scalable, reliable services, collaborate with product and frontend teams, and drive technical improvements across the stack. The role involves full-lifecycle delivery - from technical scoping and prototyping to implementation, testing, deployment, and support.

Core skills you’ll bring

• 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 (e.g., 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.

The impact you'll create

• 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.

At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others.