Sr Back End Engineer (Node.Js/Rest/Ai) (Latam Remote)

Zeo Consulting; Argentina; Remote; ARS 1,800,000 - 3,600,000; Full time

Job summary

Zeo Consulting seeks a Sr Back End Engineer (Node.js/REST/AI) to design, build, and maintain integrations with third‑party platforms from LATAM (Argentina remote). You will implement OAuth 2.0 / OpenID Connect, build scalable services in TypeScript, and own complex problems from requirements to production.

Collaborate with customers, PMs, engineers, and partners to translate needs into solid tech solutions.

Qualifications

• Experience building integrations with third-party platforms and APIs.
• Experience implementing OAuth 2.0 / OpenID Connect.
• Strong backend architecture, testing, and maintainability.

Responsibilities

• 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 (Node.js, TypeScript).
• Build comprehensive unit, integration, and end-to-end tests.
• Review production PRs, addressing architectural, security, performance, and maintainability concerns in human and AI-generated code.
• Apply modern AI engineering practices to increase development velocity.
• Own complex engineering problems from requirements through production.
• Work with customers, PMs, engineers, and partners to translate requirements into technical solutions.

Skills

Node.js

TypeScript

REST APIs

OAuth 2.0

OpenID Connect

Unit testing

AI engineering

Code review

Tools

APIs

Webhooks

Job description

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

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