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 distri

📌 Sr Back End Engineer (Buenos Aires)
🏢 Zeo Consulting
📍 Buenos Aires