Remote Senior Backend Engineer - AI-Driven API Integrations

Zeo Consulting; Municipio de Esquel; Remote; ARS 106,019,000 - 166,601,000; Full time

Benefits offered by this job

Salary in USD

Long-term work model

40h/week

Remote in LATAM

Job summary

Zeo Consulting is hiring a senior backend engineer to design, implement, and maintain integrations with third‑party platforms and APIs. You will implement OAuth 2.0/OpenID Connect flows, manage tokens, and build queue‑driven, scalable services in Node.js/TypeScript.

You will test thoroughly and review AI‑generated code, ensuring production readiness and robust system design. As part of a distributed LATAM team, you will collaborate with customers, PMs, engineers, and partners to translate

Qualifications

• 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 JavaScript/TypeScript.
• 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.

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 (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 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.

Skills

6+ years experience in back-end

Node.js

AI-assisted engineering

Code review & validation

Context engineering

JavaScript/TypeScript

Express.js/NestJS

Third-party API integrations

OAuth 2.0 / OpenID Connect

REST APIs & webhooks

Tools

Express.js

NestJS

AWS

Docker

PostgreSQL

TypeORM

OAuth/OpenID

Job description

Zeo Consulting is hiring a senior backend engineer to design, implement, and maintain integrations with third‑party platforms and APIs. You will implement OAuth 2.0/OpenID Connect flows, manage tokens, and build queue‑driven, scalable services in Node.js/TypeScript.

You will test thoroughly and review AI‑generated code, ensuring production readiness and robust system design. As part of a distributed LATAM team, you will collaborate with customers, PMs, engineers, and partners to translate