Hi, I'm
Sai Subrahmanyam
Mahadasa
6 years building workflow-heavy web applications across HR/benefits, finance, and healthcare. Strong in React/Next.js/TypeScript for UI layers, C#/.NET Core APIs, and Node.js/Express for supporting services.
Experienced with secure systems (JWT/OAuth, RBAC), optimizing SQL Server/PostgreSQL, and building GenAI/RAG chatbots using LangChain/LlamaIndex & vector databases.
About Me
Senior Full Stack Developer
Strong in React, Next.js, TypeScript for high-performing UI layers and C#/.NET Core (ASP.NET Core Web APIs) for scalable backend services, with Node.js/Express used for supporting services, integrations, and async/event-driven patterns. Experienced delivering secure systems with JWT/OAuth concepts, RBAC, and audit-friendly logging; optimizing SQL Server/PostgreSQL performance; and shipping production code through Docker + CI/CD in AWS/Azure environments.
Recently focused on GenAI/LLM features — building RAG-based chatbots using LangChain/LlamaIndex, integrating vector databases, and deploying reliable retrieval pipelines with evaluation and monitoring. Known for strong ownership, clear communication, mentoring, and partnering with product/design/QA to deliver clean UX and predictable systems from design through production support.
Full Stack Expertise
Frontend to Backend, Cloud to AI
Professional Strengths
Cross-Functional Leadership
Partner with Product, Design & QA
Mentorship & Code Reviews
Guide teams on best practices
End-to-End Ownership
Design to Production Support
Business-Focused Solutions
Balance quality with delivery
Technology Stack
React
Next.js
TypeScript
.NET Core
Node.js
SQL Server
AWS
Azure
GenAI/RAG
Docker
Certifications & Awards
ASP.NET Professional Certificate
Udemy
Frontend Developer Certificate
Udemy (JavaScript / React)
NVIDIA Developer Contest Winner
Generative AI Application (2024)
Most Recently at Perky (Client: Lincoln Finance)
Owned end-to-end delivery for HR leave-management features in a SaaS platform. Built secure, audit-friendly workflows with JWT/OAuth and RBAC patterns. Delivered a GenAI chatbot with RAG patterns for employee self-service, and improved release reliability with CI/CD, Docker, and AWS.
Outside of Work
I maintain a curious mindset through continuous learning—currently exploring history and philosophy while learning guitar. I enjoy photography, cricket, and watching films. This diverse range of interests helps me bring fresh perspectives to problem-solving and team collaboration.
My projects
Leave Management & Research Support Platform
Built a workflow-driven platform for employees and HR teams to manage leave requests, approvals, balances, eligibility r...
Technologies Used
GenAI HR Policy Assistant — RAG Chatbot
Built an HR self-service assistant that answers leave/policy questions using a retrieval-first approach. Created a docum...
Technologies Used
Financial Analytics Admin & Reporting Console
Built an internal console for finance teams to configure thresholds and reporting rules, then explore analytics results ...
Technologies Used
Healthcare Case Management Web App
Worked on a case management system used by clinicians and support teams to track cases, tasks, and communications. Imple...
Technologies Used
Technical Expertise
- React
- Next.js
- TypeScript
- JavaScript (ES6+)
- C#
- Python
- SQL
- Node.js
- Redux Toolkit
- RTK Query
- React Hooks
- HTML5/CSS3
- SSR/CSR
- .NET Core
- ASP.NET Core Web API
- Entity Framework Core
- LINQ
- Express
- REST APIs
- GraphQL
- SQL Server
- PostgreSQL
- MySQL
- MongoDB
- Redis
- JWT/OAuth
- RBAC
- LangChain
- LlamaIndex
- RAG/Vector DB
- AWS
- Azure
- Docker
- GitHub Actions
- Azure DevOps
- CI/CD
- Jest
- xUnit/MSTest
- Postman
- Git
- Jira
- Confluence
My Career Journey
Bachelor of Engineering, Computer Engineering
Completed a Bachelor of Engineering in Computer Engineering with a GPA of 3.58/4.00, building a strong foundation in software fundamentals and systems.
Software Developer / Full Stack Developer
Delivered healthcare applications used by clinical and support staff to manage cases, tasks, and follow-ups. Built backend features in ASP.NET MVC/Web API using service-layer patterns, modernized key UI modules with React, and maintained SQL Server schemas with audit-friendly history tracking. Standardized environments using Docker and supported AWS delivery patterns.
Software Developer (Contract)
Built internal finance tools — configuration screens, reporting dashboards, and workflow experiences. Developed React + TypeScript dashboards with complex filtering and drilldowns, implemented ASP.NET Core APIs with clean separation of concerns, and tuned SQL Server performance by analyzing execution plans, rewriting heavy joins, and adding targeted indexes. Worked in an Azure-first environment with Git-based CI/CD workflows.
Senior Application Developer (Full Stack)
Owned end-to-end delivery for leave-management features across the HR platform (SaaS). Built React + Next.js + TypeScript UI experiences using reusable component patterns with Redux Toolkit/RTK Query. Delivered backend services with ASP.NET Core Web APIs and Node.js/Express for supporting services and integrations. Implemented secure workflows using JWT/OAuth and RBAC patterns, built a GenAI chatbot with RAG patterns (LangChain/LlamaIndex), and improved release reliability with GitHub Actions CI/CD and Docker in AWS environments. Mentored teammates through PR reviews and pairing sessions.
Master of Science, Computer Science
Completed graduate study focused on advanced algorithms, machine learning, and AI systems with a strong academic record (GPA 3.63/4.00).