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Senior Backend Engineer - Integrations & Distributed Systems (Node.js) at DaCodes. About DaCodes. At DaCodes, we build high-impact software solutions for startups and global companies across LATAM and the U.S. We work with senior teams who value ownership, technical excellence, and high-quality engineering standards.. Role Overview. We are looking for a . Senior Backend Engineer. with a strong focus on integrations, capable of designing, implementing, and maintaining robust, scalable, and secure backend systems, primarily using Node.js, APIs, and event-driven architectures.. This is not a low-code configuration role. It requires deep understanding of backend engineering, protocols, concurrency, and security.. What You’ll Do. Design and implement backend integrations between SaaS platforms, ERPs, and internal services.. Design and maintain secure, versioned, and resilient REST APIs for external integrations.. Design and implement event-driven patterns (webhooks, retries, idempotency, duplicate handling, and eventual consistency).. Design and implement authentication and authorization flows:. OAuth2 (authorization flows) . JWT (token format & validation) . API Keys, HMAC . Analyze concurrency, performance, and scalability issues in Node.js.. Implement observability strategies (structured logging, monitoring, and robust error handling in production).. Evaluate architectural trade-offs in integration, security, and data consistency scenarios.. Be responsible for the stability and reliability of production integrations.. 4+ years developing backend systems in production, with experience in integrations and distributed architectures.. Advanced Node.js (event loop, async I/O, blocking vs. non-blocking).. Strong understanding of HTTP at the protocol level.. Hands-on experience with:. OAuth2 (authorization code / client credentials) . JWT (not as “magic” auth) . Webhooks (idempotency, retries, deduplication) . Experience resolving real incidents and production issues.. Advanced English (communication with US clients).. Nice to Have. Experience with iPaaS (Mulesoft, Workato, Boomi, etc.).. ERP integrations (NetSuite, SAP, Business Central).. Knowledge of CI/CD.. Experience in high-concurrency environments.. Company Location: Uruguay.