Backend Developer
Kasper Infotech Pvt. Ltd.Noida, UP
Building and operating the production backends behind 3 client platforms — from geospatial dispatch engines to multi-tenant commerce.
Overview
About the role
At Kasper Infotech I own the backend layer of every client platform the company ships: designing the APIs, modeling the data, and running the infrastructure they live on. My work spans the full delivery cycle — from whiteboard architecture and API contracts with mobile/frontend engineers, through implementation in Node.js, Express.js, and TypeScript, to AWS deployment, monitoring, and zero-downtime releases.
The portfolio I've built here covers genuinely different problem spaces: a multi-tenant school-management SaaS with isolated tenant configuration, an on-demand field-logistics platform with geospatial technician dispatch and split payments, and a 10-module e-commerce backend with triple-layer authentication. Each one demanded different trade-offs — but the constant is strict API contracts, measured performance, and backends that stay boring in production. The school platform, MUN-C SMS, is currently in pre-production testing with pilot institutions ahead of its public rollout.
Highlights
What I do here
- Architect, build, and deploy production-grade REST APIs and modular backend services powering 3 client platforms — e-commerce storefronts, on-demand service apps with 3 published Android applications, and a multi-tenant school SaaS currently in pre-production testing.
- Partner with cross-functional mobile and frontend engineers to define strict API contracts, reducing integration bugs and accelerating feature delivery cycles.
- Optimize MongoDB schemas, compound indexes, and aggregation pipelines, maintaining sub-150ms average API response times under production traffic.
- Manage cloud infrastructure and application lifecycle using AWS EC2, Nginx reverse proxy, and PM2 process management to ensure high availability and zero-downtime deployments.
Day to day
Core responsibilities
- Architect and version REST APIs that mobile and web clients integrate against, with strict contract documentation
- Design MongoDB schemas, compound indexes, and aggregation pipelines tuned to real query patterns
- Implement authentication, authorization, and payment flows (JWT, OAuth 2.0, OTP, Razorpay) to production standard
- Operate AWS EC2 infrastructure — Nginx reverse proxy, PM2 cluster mode, log pipelines, and zero-downtime deploys
- Partner with cross-functional teams to scope features, estimate delivery, and triage production issues
Impact
Key achievements
In production
Client engagements
Dravya RO
— On-Demand Service & Field Logistics PlatformLive on Google Play- Engineered the centralized backend supporting 3 mobile apps (Customer, Technician, Admin) using Node.js, Express.js, and MongoDB.
- Integrated MongoDB geospatial ($nearSphere) indexing to match service requests to the nearest qualified technician, cutting manual dispatch delays to near-zero.
- Implemented real-time job notifications via FCM and secured technician onboarding using 2Factor mobile OTP and granular RBAC.
- Integrated Razorpay split-payment architecture supporting prepaid online and post-service settlements with automated per-job commission tracking.
Happy Art Supplies
— E-Commerce PlatformLive in Production- Designed and launched a 10-module e-commerce backend managing catalog, cart, orders, inventory locks, reviews, and admin operations.
- Implemented triple-layer authentication (JWT, OAuth 2.0 social login, and Email OTP) combined with role-based access control (RBAC).
- Automated inventory adjustments, restocking alerts, dynamic zone-based shipping calculations, and programmatic PDF invoice generation post Razorpay checkout.
- Built an 8-facet dynamic admin configuration engine, enabling non-technical stakeholders to update banners, promo codes, and loyalty tiers without code redeployments.
MUN-C SMS
— Multi-Tenant School Management SaaSIn Testing- Architected the multi-tenant backend with per-institution isolation of roles, modules, fee structures, and billing plans — zero cross-tenant leakage.
- Shipped 15+ core modules (admissions, scheduling, attendance, exams, fees, payroll, transport, library) across 5 user tiers with scoped RBAC.
- Built the real-time layer: tenant-scoped Socket.IO rooms, Redis Pub/Sub fan-out for horizontal scaling, and FCM push for fee reminders and circulars.
- Currently in pre-production testing with pilot institutions ahead of the public rollout.
Toolbox
Technologies used
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