About CompanyAscendion is a leader in AI-powered software engineering, helping businesses innovate faster, smarter, and with greater impact. We partner with Global 2000 clients across North America, APAC, and Europe to solve complex challenges in data, experience design, software product engineering, and workforce transformation. Powered by expert engineers, thousands of AI agents, and our Engineering to the Power of AI™ (EngineeringAI) method, we deliver measurable outcomes that build trust, unlock value, and accelerate growth. Learn more at ascendion.com.Engineering to the Power of AI™, AAVA™, EngineeringAI, Engineering to Elevate Life™, DataAI, ExperienceAI, Platform EngineeringAI, Product EngineeringAI, Quality EngineeringAI, and GCCAI are trademarks or service marks of Ascendion®. AAVA™ is pending registration. Unauthorized use is strictly prohibited.Website -Job DescriptionSenior Backend Developer / Node.js DeveloperExperience - 5+ YearsLocation- Pune – Baner (Onsite/Hybrid as per company policy)Position SummaryWe are looking for a Senior Backend Developer (Node.js) to join our engineering team and play a key role in building scalable, high-performance backend systems. The ideal candidate will have strong hands-on experience in Node.js, microservices architecture, AWS, message queues (Kafka or SQS), and monitoring tools like Datadog or Splunk.This role requires deep backend ownership, strong system design skills, and the ability to work in a fast-paced, production-driven environment.Key ResponsibilitiesDesign, develop, and maintain scalable backend services using Node.jsBuild and manage microservices-based architecturesDevelop highly available and fault-tolerant systems on AWSImplement asynchronous processing using Kafka or AWS SQSEnsure high performance, security, and reliability of backend servicesIntegrate monitoring, logging, and alerting using Datadog and/or SplunkCollaborate closely with frontend, DevOps, QA, and product teamsParticipate in code reviews, architecture discussions, and performance optimizationTroubleshoot production issues and ensure quick resolutionContribute to backend best practices, coding standards, and system improvementsMandatory Skills (Must-Have)Each of the below skills is mandatory and must be present in the candidate's resumeNode.js (Backend development experience)Microservices architectureAWS (EC2, Lambda, S3, RDS, etc.)Kafka or AWS SQS (event-driven / messaging systems)Datadog and/or Splunk (monitoring, logging, observability)Additional RequirementsStrong understanding of REST APIs and backend integrationsExperience working with databases (SQL/NoSQL)Knowledge of cloud-native and distributed systemsExperience handling production-scale applicationsStrong problem-solving and debugging skillsExcellent communication and teamwork abilitiesNice to HaveExperience with Docker / KubernetesCI/CD pipeline exposureSystem design and architecture experiencePrior experience in high-traffic or startup environments