Featured Projects

Production systems I've designed and built — full-stack applications with measurable engineering impact.

Restaurant ERP Platform

Production Ready

Enterprise Restaurant Management Platform built using React, FastAPI, PostgreSQL, Docker and AWS Cloud Infrastructure.

Problem Solved

Restaurants often depend on multiple disconnected applications for inventory, procurement, billing, reporting, branch management, and operational analytics.

Technologies

Production ReadyEnterpriseAWSDockerFastAPIReactPostgreSQLRedisCloud Native

Key Features

  • Multi-location restaurant management with RBAC and executive dashboards
  • Inventory, procurement, supplier management, and billing foundation
  • Cloud-native architecture with Docker and AWS Infrastructure as Code
  • Public live demonstration with enterprise AWS deployment architecture preserved

Engineering Challenges

  • Designing scalable enterprise architecture and reusable FastAPI modules
  • JWT authentication, PostgreSQL schema design, and Redis integration
  • AWS Infrastructure as Code, IAM, networking, and cloud cost optimization

Business Impact

Unifies restaurant operations into one enterprise platform with cloud-native architecture and a production-ready public demonstration.
Live DemoCase StudyGitHub

MDQM / MDM Data Governance Platform

Live

Enterprise master data management platform for dataset governance, quality validation, and metadata enrichment.

Problem Solved

Organizations lacked a centralized system to manage master datasets, enforce data quality rules, and profile incoming data before it reached downstream analytics pipelines.

Technologies

ReactFastAPIPostgreSQLSnowflakeTailwind CSSJWTPython

Key Features

  • Dataset upload, versioning, and quarantine workflows
  • Dynamic rules engine with configurable validation
  • Data profiling with column-level statistics
  • AI-powered column description generation
  • Metadata management and governance dashboard

Engineering Challenges

  • Designing a flexible rules engine that supports dynamic validation without hard-coding business logic
  • Synchronizing operational data between PostgreSQL and Snowflake while maintaining consistency
  • Building responsive dashboards that handle large dataset previews without degrading UX

Business Impact

Reduced manual data validation effort and gave data teams a single platform to govern, profile, and trust their master datasets before analytics consumption.
Live DemoCase StudyGitHub

Nexora CRM

Live

Production-grade multi-tenant SaaS CRM with lead management, sales pipelines, role-based access control, and analytics dashboards.

Problem Solved

Sales teams needed a centralized platform to track leads, manage pipeline stages, and enforce role-based permissions across multiple organizations without data leakage between tenants.

Technologies

Next.jsFastAPIPostgreSQLTypeScriptPythonJWT

Key Features

  • Multi-tenant architecture with isolated org data
  • JWT authentication and role-based access control
  • Lead management and sales pipeline workflows
  • Analytics dashboards for pipeline and conversion metrics
  • RESTful API with tenant-scoped queries

Engineering Challenges

  • Designing tenant isolation at the database and API layer without sacrificing query performance
  • Implementing RBAC that scales across admin, manager, and rep roles per organization
  • Building analytics aggregations that stay fast as pipeline data grows

Business Impact

Multi-tenant SaaS CRM platform shipped end-to-end.
Live DemoCase Study

Shop Sphere

Live

Full-stack e-commerce platform with secure checkout, product catalog, and payment integration.

Problem Solved

Small businesses needed a production-ready online store with secure authentication, inventory management, and seamless payment processing.

Technologies

Next.jsNode.jsExpressMongoDBJWTRazorpayTailwind CSS

Key Features

  • JWT-based authentication and protected routes
  • Product catalog with search and filtering
  • Shopping cart with persistent state
  • Razorpay payment gateway integration
  • RESTful API with role-based access

Engineering Challenges

  • Handling payment webhook reliability and order state consistency
  • Designing a cart system that syncs across sessions and devices
  • Optimizing product listing pages for mobile-first performance

Business Impact

Delivered a deployable e-commerce solution enabling merchants to accept online orders with secure payments and a polished shopping experience.
Live DemoCase StudyGitHub

MediLink

Live

Healthcare appointment booking platform with secure patient–provider workflows.

Problem Solved

Healthcare providers needed a reliable way for patients to book appointments online while keeping sensitive data protected behind authenticated APIs.

Technologies

ReactNode.jsExpressPostgreSQLJWTREST API

Key Features

  • Patient registration and JWT-secured login
  • Appointment scheduling with availability checks
  • Protected REST APIs with input validation
  • Responsive UI optimized for mobile patients
  • PostgreSQL-backed persistence with relational schema

Engineering Challenges

  • Modeling appointment conflicts and provider availability in PostgreSQL
  • Implementing secure session handling without exposing patient data
  • Building accessible forms for diverse user demographics

Business Impact

Streamlined appointment booking for healthcare providers, reducing phone-based scheduling overhead and improving patient access.
Live DemoCase StudyGitHub

Other Projects

Additional web applications and client deliverables.

Energy Lab

Live

Modern component-based frontend with mobile-first responsive design.

Problem Solved

An energy research organization needed a fast, engaging web presence optimized for mobile visitors.

Technologies

ReactAstroResponsive Design

Key Features

  • Component-based architecture
  • Mobile-first responsive layout
  • Performance-optimized asset delivery

Engineering Challenges

  • Balancing rich visual content with fast page load on mobile networks

Business Impact

Improved user engagement through a polished, performant frontend deployed globally.
Live DemoGitHub

Galaxy Power

Live

Structured corporate website with intuitive navigation and responsive layout.

Problem Solved

A corporate client needed a professional web presence with clear information architecture and cross-device compatibility.

Technologies

Next.jsTailwind CSSResponsive Design

Key Features

  • Structured page hierarchy
  • Responsive corporate layout
  • SEO-friendly routing

Engineering Challenges

  • Designing navigation that scales across desktop and mobile viewports

Business Impact

Delivered a professional corporate site that improved brand visibility and user navigation.
Live DemoGitHub

School of Sustainability

Live

SEO-optimized educational website with reusable UI components.

Problem Solved

An educational institution needed a globally delivered, search-engine-friendly website.

Technologies

Next.jsAstroCloudflare PagesSEO

Key Features

  • SEO-optimized pages
  • Reusable UI components
  • Cloudflare Pages deployment

Engineering Challenges

  • Achieving strong SEO scores while maintaining a modern component architecture

Business Impact

Increased online visibility for the institution with fast global content delivery.
Live DemoGitHub

Engineering Focus

Core engineering domains I actively work in while continuously improving my expertise.

Enterprise SaaS Development

Build multi-tenant SaaS products with secure auth and scalable architecture.

Backend Architecture

Design scalable REST APIs and modular backend services.

Distributed Systems

Architect resilient systems across services and data stores.

Cloud Engineering

Deploy secure, scalable cloud-native applications.

Data Platforms

Build reliable data pipelines and relational database solutions.

Performance Optimization

Optimize APIs, queries, and frontend delivery for production scale.

API Design

Design clear, secure, and maintainable REST API contracts.

System Design

Model end-to-end systems with clear boundaries and trade-offs.

Certifications

Professional certifications and continuous learning that strengthen my full-stack engineering expertise.

  • 6 Professional Certifications
  • Cloud & Data Engineering
  • Frontend & Backend
  • Continuous Learning

Contact

Thank you for visiting my portfolio. If you'd like to learn more about my experience, projects, or connect professionally, feel free to get in touch.

Let's Connect

Thank you for visiting my portfolio.

This portfolio highlights my experience, technical skills, and the projects I've built throughout my software engineering journey.

If you have any questions or would like to discuss my background, feel free to reach out. I'd be happy to connect.

Emailsundarlingam272000@gmail.comPhone+91 6382519651
LocationChennai, Tamil Nadu, India
Portfolio Websitesundarlingam.vercel.appGitHubSudharsen27LinkedInsundar-lingam