TekWissen India seeks a Back-end Software Development Engineer III for a full-time position located in Chennai, Tamil Nadu. This senior-level role focuses exclusively on server-side development using Node.js. Responsibilities include designing, building, and maintaining scalable APIs, database layers, and core back-end services. Candidates must have extensive Node.js experience and a deep understanding of performance optimization, security, and system reliability. The position requires the ability to tackle complex technical challenges and contribute to architectural decisions. Prior experience in a similar back-end engineering role is essential, along with the capability to mentor less experienced team members. This is an on-site job requiring daily presence in Chennai.