Niraj Mahto

A multi-tenant PaaS backend that turns a git push into a running container. Built the orchestration layer, the queueing, and the dashboard that watches it all happen in real time.

• Multi-tenant PaaS backend in Node.js/Express, containerized via Docker — cut environment setup time by 60% vs manual provisioning
• REST API orchestrating build pipelines on Redis-backed job queues for async, non-blocking concurrent deployments
• Git webhook-triggered CI/CD with PostgreSQL job tracking, live build status, zero-downtime rolling deploys
• React dashboard — WebSocket live updates, React.memo/useCallback, Webpack+Babel tuned for a ~40% smaller bundle

Three roles, one app. Admin, driver, and resident each get a purpose-built view, wired to the same real-time backend.

• Role-based Flutter app (Admin/Driver/User) with real-time GPS task assignment on a Node.js/Express + MongoDB backend
• JWT-based RBAC middleware securing role-segregated endpoints across all three roles
• MongoDB indexing + middleware-level caching cut API latency by 35%
• Route-optimization logic reduced driver travel distance by 20%; offline-first with conflict resolution

An ensemble model trained to catch what a single classifier misses — tuned specifically to reduce missed positives, the costliest kind of error in a clinical setting.

• Soft-voting ensemble (Logistic Regression + Random Forest + XGBoost) on 6,200 UCI records — 92.3% accuracy
• SMOTE oversampling + precision-recall threshold tuning cut false negatives by 18%

A single Flutter codebase serving three isolated interfaces — customer, receptionist, admin — kept in sync over Firebase and Supabase.

• Single-codebase Flutter app with three role interfaces; Firebase real-time notifications + Supabase (PostgreSQL)
• Admin: booking approval, one-tap deep-linked calls, Maps navigation. Receptionist: daily schedule + pending queue