Hi, I'm
Nishal Devadiga
Backend Engineer Specializing in Scalable Systems & API Architecture
I build high-performance infrastructure for health-tech and logistics platforms. Experienced in solving concurrency challenges, optimizing database queries, and deploying production-ready APIs.
Featured Case Study
Aarogya Sampark Healthcare Platform
Role: Backend Developer (Contract)
The Challenge:
Architecting a comprehensive healthcare ecosystem supporting multiple user roles (Patients, Labs, Doctors, Admins) with complex business logic including multi-level referral commissions, subscription management, automated appointment scheduling, secure payment processing, and HIPAA-compliant media handling—all while maintaining high concurrency and data integrity across distributed systems.
System Architecture
High-level system design overview
Core Modules & Engineering Wins:
Multi-Level Referral System
Engineered a hierarchical commission structure supporting 5+ levels with real-time calculations and automated payouts
Smart Appointment Engine
Built intelligent slot generation with cron jobs handling dynamic availability, buffer times, and provider preferences
Payment Integration
Integrated Razorpay with webhook handling, refund management, and split payments for multi-party transactions
Subscription Management
Developed flexible subscription tiers with auto-renewal, grace periods, and usage-based billing calculations
Email Automation
Created templated mailing system with queue management for notifications, reminders, and marketing campaigns
Media Management
Implemented S3 integration with signed URLs, image compression, and secure video streaming for reports and profiles
Technical Achievements:
RBAC Middleware Architecture:
Designed granular permission system with role inheritance, resource-based access control, and JWT middleware for secure multi-tenant isolation
Concurrency & Performance:
Implemented optimistic locking for booking conflicts and Redis caching strategies, achieving 50% latency reduction (200ms to 100ms) and handling 150+ concurrent users
Automated Workflow Engine:
Built comprehensive cron job ecosystem for slot generation, subscription renewals, commission calculations, and notification scheduling
Data Security & Compliance:
Implemented HIPAA-compliant data handling with encrypted S3 storage, audit logging, and secure API authentication patterns
Complete Tech Stack:
Backend: Node.js, Express.js, JWT Authentication
Database: MySQL, Redis Cache, Connection Pooling
Payments: Razorpay API, Webhook Processing, Refund Management
Cloud: AWS S3, Signed URLs, Image Processing
Communication: Email Templates, SMS Integration, Push Notifications
Security: RBAC Middleware, Permission Matrix, Data Encryption
Passion Project
Sweepzy - Civic Impact Platform
Role: Full Stack Developer
A multilingual platform empowering communities to report civic issues. Built with a microservices approach using Next.js for frontend and FastAPI for high-performance backend tasks.
Technical Highlights:
Geospatial Queries
Optimized PostgreSQL queries to map litter reports within specific user radii
DevOps Excellence
Fully containerized using Docker with CI/CD pipelines for zero-downtime deployments on Fly.io
Hybrid Caching
Utilized Redis to accelerate read operations for user-generated content images
Live Platform
Fully functional web application
Technical Arsenal
Core Backend
- Node.js
- Python
- FastAPI
- Express.js
Data & Storage
- PostgreSQL
- MySQL
- MongoDB
- Redis
- Query Optimization
Infrastructure & DevOps
- Docker
- Kubernetes
- AWS (S3, ECS, Lambda)
- Nginx
- CI/CD Pipelines
System Design & Testing
- RESTful APIs
- Microservices
- RBAC
- OAuth2
- Jest
- Load Testing
Professional Timeline
Backend Developer (Contract)
Aug 2025 - PresentIR Infotech
Sole developer for a comprehensive healthcare backend infrastructure.
Full Stack Developer Intern
Feb 2025 - June 2025Gained experience in full stack development with modern web technologies.
B.E. Computer Science
2025 GraduateMangalore Institute of Technology & Engineering