Senior Backend Integration Engineer (Node.js)- English Required

About DaCodesAt 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 OverviewWe 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.Why this role is interesting Work on complex backend systems and real-world integrations (SaaS, APIs, ERPs) Solve challenges around scalability, reliability, and distributed systems Collaborate with a highly senior team with strong technical ownership Work directly with U.S.-based clients and products with real impactWhat You’ll Do Design and implement robust backend integrations across multiple systems (SaaS, APIs, internal services) Build and maintain secure, scalable REST APIs Design and operate event-driven systems (webhooks, async processing, retries, idempotency) Implement authentication and authorization flows: OAuth2 (authorization code, client credentials) JWT (token validation, security considerations) API Keys / HMAC when needed Handle real-world integration challenges: duplicated events out-of-order data partial failures Debug and resolve production issues across distributed systems Ensure proper logging, monitoring, and error handling Participate in technical decision-making and trade-offsRequirements4+ years of backend experience Strong experience with Node.js (deep understanding of async I/O and event loop behavior) Solid understanding of HTTP protocol and API design Proven experience designing and operating webhooks in production, including: idempotency handling retries and failure recovery event deduplication Experience implementing OAuth2 flows, including: authorization code client credentials token lifecycle and refresh tokens Strong understanding of JWT beyond basic usage (signing, validation, security implications) Experience working with production systems under real constraintsWhat We’re Looking ForYou should be comfortable working in environments where: Systems communicate through events and asynchronous processes Data may arrive duplicated, delayed, or inconsistent Integrations fail and need to be retried safely You are responsible for debugging real production issues across servicesNice to Have Experience with iPaaS platforms (Mulesoft, Workato, Boomi) Experience integrating with ERPs (NetSuite, SAP, Business Central) Experience with queues, background jobs, or messaging systems CI/CD experience Experience in high-concurrency environments Benefits🚀 Work with global brands and disruptive startups. 🏡 Remote work / Home office. 📍 If a hybrid or on-site model is required, you will be informed from the first session. ⏳ Work schedule aligned with the assigned project/team. 📅 Monday to Friday schedule. ⚖️ Legal benefits (Applicable for Mexico). 🎉 Day off on your birthday. 🏥 Private health insurance (Applicable for Mexico). 🛡️ Life insurance (Applicable for Mexico). 🌎 Multicultural teams. 🎓 Access to courses and certifications. 📢 Meetups with industry experts and top universities. 📡 Virtual networking events and interest groups. 📢 English classes. 🏆 Opportunities within our different business lines. 🏅 Proudly certified as a Great Place to Work.Originally posted on Himalayas