Technical Architect Cloud - React L3 Support

**Overview:** * We are seeking an experienced **Senior UI / Full-Stack Sustaining Engineer** with 7–8 years of hands-on experience in **ReactJS and Node.js**. In this role, you will be the core technical escalation point responsible for investigating, debugging, and resolving complex, customer-reported frontend and middleware issues in production environments. **What you will do:** * **Customer Issue Triage & Root Cause Analysis:** Investigate, reproduce, and resolve critical production defects and performance bottlenecks reported by enterprise customers across UI layers and Node.js backends. * **Code Remediation & Hotfixing:** Author clean, maintainable bug fixes, patches, and hotfixes with minimal turnaround time while ensuring zero regression. * **Live Production Debugging:** Utilize browser developer tools, network analyzers, APM tracing tools, and server-side log analytics to isolate issues in real time. * **Cross-Functional Collaboration:** Partner closely with  core product engineering, QA, and Site Reliability Engineering (SRE) teams to drive issues to resolution. * **Documentation & Prevention:** Document Root Cause Analyses (RCAs), author technical troubleshooting runbooks, and provide feedback to core product teams to prevent recurring defects. * **Shift Operations:** Actively participate in a **24/7 rotational shift model**, ensuring SLA compliance for high-priority incidents (Sev-1 / Sev-2). **What we are looking for:** * **Frontend Mastery:** 6+ years of strong experience in **ReactJS**, JavaScript (ES6+), TypeScript, HTML5, CSS3, and state management libraries (Redux, Zustand, Context API). * **Backend / Middleware:** 3+ years of experience with **Node.js** and Express/NestJS, including RESTful API integration, asynchronous programming, and middleware architectures. * **Advanced Debugging:** Deep proficiency in Chrome DevTools (Performance, Memory Profiler, Network), React DevTools, and error-tracking tools (Sentry, LogRocket, or Datadog). * **Observability & Logging:** Hands-on experience querying application logs and metrics using tools such as Splunk, Kibana, Grafana, or CloudWatch. * **Version Control & CI/CD:** Strong knowledge of Git workflows, branching strategies, and CI/CD pipelines (GitHub Actions, Jenkins, or GitLab CI). * Qualifications & Shift Requirements: * **Experience:** 7 to 8 years in frontend/full-stack development or sustaining engineering/L3 support. * **Education:** Bachelor’s or Master’s degree in Computer Science, Information Technology, or a related engineering field. * **Shift Readiness:** **Mandatory flexibility to work in a rotating 24/7 shift schedule** (including day, swing, night, and weekend shifts). * **Communication:** Excellent written and verbal English communication skills, with experience writing crisp technical RCAs and communicating with global customer-facing **Our Values** If you want to know the heart of a company, take a look at their values. Ours unite us. They are what drive our success – and the success of our customers. Does your heart beat like ours? Find out here: [Core Values](https://blueyonder.com/about/core-values) All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status.