Senior Node.js Backend Engineer
Role summary
We are seeking an experienced Senior Node.js Backend Engineer with 5+ years of hands-on experience in building scalable, high-performance server-side applications. The ideal candidate will have deep expertise in Node.js, microservices architecture, and real-time streaming systems, with strong exposure to Kafka, TypeScript/JavaScript, and modern backend frameworks. Responsibilities include designing, developing, and maintaining server-side applications, building microservices, implementing real-time data streaming solutions, and ensuring code quality, performance, security, and scalability.
*Please note, this role is not able to offer visa transfer or sponsorship now or in the future*
Job Summary
We are seeking an experienced Senior Node.js Backend Engineer with 5+ years of hands-on experience in building scalable, high-performance server-side applications. The ideal candidate will have deep expertise in Node.js, microservices architecture, and real-time streaming systems, with strong exposure to Kafka, TypeScript/JavaScript, and modern backend frameworks.
Key Responsibilities
- Design, develop, and maintain server-side applications using Node.js with Express.js / Fastify frameworks.
- Build and manage microservices-based architectures with high availability and scalability.
- Implement real-time data streaming solutions using Kafka and event-driven patterns.
- Develop and optimize backend logic with a strong focus on Object-Relational Mapping (ORM) and efficient data handling.
- Design, implement, and document RESTful APIs following industry best practices.
- Create and maintain comprehensive API documentation using Swagger / OpenAPI specifications.
- Ensure code quality, performance, security, and scalability across backend services.
- Collaborate with frontend, DevOps, and data engineering teams to deliver end-to-end solutions.
- Troubleshoot, debug, and optimize backend services in production environments.
Required Skills & Qualifications
- 5+ years of hands-on experience in Node.js backend development.
- Strong expertise in server-side programming and backend system design.
- Extensive experience with Express.js and/or Fastify frameworks.
- Solid understanding of streaming architectures and event-driven systems.
- Hands-on experience with Kafka for message streaming and asynchronous processing.
- Strong knowledge of ORM tools (e.g., Sequelize, TypeORM, Prisma).
- Proficiency in TypeScript for building robust and maintainable backend services.
- Experience in building microservices and distributed systems.
- Strong experience in API design and documentation using Swagger/OpenAPI.
- Good understanding of performance optimization, logging, monitoring, and error handling.
- Familiarity with CI/CD pipelines, containerization, and cloud-native deployments is a plus.
Nice to Have
- Experience with high-throughput systems and real-time data pipelines.
- Exposure to cloud platforms (AWS / Azure / GCP).
- Knowledge of security best practices for backend APIs.
Experience with containerization tools like Docker and Kubernetes
Sample Cognizant interview questions
- 1
Implement a platform for handling live user authentication.
system designmedium - 2
How would you explain the purpose and functionality of GitHub to someone unfamiliar with coding or version control systems?
technicalmedium - 3
Determine if a string can be a palindrome after deleting at most one character.
codingmedium - 4
Maximize the minimum distance between aggressive cows in stalls.
codingmedium - 5
Unique Combinations that Sum to a Target Find all unique combinations in an array that sum to a target. Input: candidates = [2,4,6], target = 6 Output: [[2,2,2], [2,4], [6]] Explanation: Uses backtracking to find all valid combinations that sum to 6, allowing for explicitly repeated elements.
codingmedium
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