Sr Back End Engineer (Node.JS/REST/AI) (LATAM remote)

Zeo Consulting; Buenos Aires; A distancia; ARS 182.788.000 - 289.414.000; Jornada completa

Descripción de la vacante

Zeo Consulting is seeking a senior backend engineer to design, build, and maintain integrations with third‑party platforms and APIs, including OAuth flows, webhooks, and bidirectional data sync. You will work directly with customers, product managers, and engineers to translate requirements into scalable technical solutions.

You will develop with Node.js and TypeScript, review production PRs, and apply AI‑assisted engineering practices to boost velocity while maintaining high standards.

Formación

• 6+ years of back-end development experience.
• Experience with Node.js.
• Experience with AI-assisted engineering workflows (e.g. spec-driven development, agentic development, Cursor, Claude Code, Codex, Windsurf).
• Experience reviewing and validating AI-generated code against strong engineering standards.
• Deep understanding of context engineering and task decomposition for coding agents.
• Experience with back-end frameworks (e.g. Express.js, NestJS).
• Experience building and maintaining third-party API integrations.
• Experience with OAuth 2.0 / OpenID Connect, REST APIs, webhooks and token lifecycle management.
• Experience with event-driven systems and message queues (e.g. AWS SQS), including retries, dead-letter queues and backpressure.
• Experience with relational databases and ORMs (e.g. PostgreSQL, TypeORM).
• Experience with cloud platforms and containers (e.g. AWS, Docker).
• Ability to architect resilient distributed systems that depend on unreliable third-party APIs.
• Ability to explain where AI agents succeed, where they fail, and how their output is kept production-ready.
• Proficiency with testing, debugging, code review and PR development.
• Deep knowledge of OOP, SOLID and software design principles.
• Strong communication skills in both spoken and written English, with confidence in direct customer conversations.

Responsabilidades

• Design, build, and maintain integrations with third-party platforms and APIs.
• Implement OAuth 2.0 / OpenID Connect flows, secure token management, webhooks, and bidirectional data sync.
• Design queue-driven systems handling retries, rate limits, partial failures, backpressure, and eventual consistency.
• Build scalable backend services (e.g., Node.js, TypeScript).
• Build comprehensive unit, integration, and end-to-end tests.
• Build and review production PRs, identifying architectural, security, performance, and maintainability issues.
• Apply modern AI engineering practices to increase development velocity.
• Own complex and ambiguous engineering problems from requirements through production.
• Work directly with customers, product managers, engineers, and external partners to translate requirements into technical solutions.

Conocimientos

Node.js

TypeScript

AI-assisted engineering

OAuth 2.0 / OpenID Connect

REST APIs

Webhooks

PostgreSQL

TypeORM

AWS

Docker

Express.js

NestJS

CI/CD

English communication

Herramientas

AWS

Docker

PostgreSQL

TypeORM

REST APIs

Descripción del empleo

Design, build, and maintain integrations with third-party platforms and APIs (e.g., construction ERPs, Microsoft and Google ecosystems, email and calendar providers, enterprise identity systems)

Implement OAuth 2.0 / OpenID Connect flows, secure token management, webhooks, and bidirectional data sync

Design queue-driven systems handling retries, rate limits, partial failures, backpressure, and eventual consistency

Build scalable backend services (e.g., Node.js, TypeScript)

Build comprehensive unit, integration, and end-to-end tests

Build and review production PRs, identifying architectural, security, performance, and maintainability issues in both human and AI-generated code

Apply modern AI engineering practices (e.g., specs, coding agents, AI editors, structured implementation, and review workflows) to increase development velocity

Own complex and ambiguous engineering problems from requirements through production

Work directly with customers, product managers, engineers, and external partners to translate requirements into technical solutions

Must-haves

6+ years of back-end development experience

Experience with Node.js

Experience with AI-assisted engineering workflows (e.g. spec-driven development, agentic development, Cursor, Claude Code, Codex, Windsurf)

Experience reviewing and validating AI-generated code against strong engineering standards

Deep understanding of context engineering and task decomposition for coding agents

Experience with back-end frameworks (e.g. Express.js, NestJS)

Experience building and maintaining third-party API integrations

Experience with OAuth 2.0 / OpenID Connect, REST APIs, webhooks and token lifecycle management

Experience with event-driven systems and message queues (e.g. AWS SQS), including retries, dead-letter queues and backpressure

Experience with relational databases and ORMs (e.g. PostgreSQL, TypeORM)

Experience with cloud platforms and containers (e.g. AWS, Docker)

Ability to architect resilient distributed systems that depend on unreliable third-party APIs

Ability to explain where AI agents succeed, where they fail, and how their output is kept production-ready

Proficiency with testing, debugging, code review and PR development

Deep knowledge of OOP, SOLID and software design principles

Strong communication skills in both spoken and written English, with confidence in direct customer conversations

• Strong emphasis on hands-on AI-assisted engineering: candidates should have real experience with AI coding agents (e.g. Cursor, Codex, Windsurf) plus reviewing and validating AI-generated code, context engineering, and task decomposition, on top of solid Node.js/TypeScript back-end and third-party API integration work (OAuth, webhooks, queues).
• Salary in USD
• Only Remote in Argentina, Brazil, Colombia, Mexico, Paraguay, Chile, Peru, Costa Rica, Uruguay

To join the team of a SaaS company from USA.