[Hiring] Senior Back End Engineer @Zeo Consulting

Role 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.

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.
• 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).

Benefits

• Salary in USD.
• Work Model: Long-term · 40h/week.
• Only Remote in Argentina, Brazil, Colombia, Mexico, Paraguay, Chile, Peru, Costa Rica, Uruguay.