FULL STACK ENGINEER · .NET · REACT · AZURE · AI
Hi, I'm Reegan Rajasekar
Software Engineer II at Adaptive Bizapp Systems
.NET (C#) · React · Angular · SQL Server · Azure · FastAPI · MCP · RAG · OpenAI & Azure AI Foundry · OWASP Application Security
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View CV🧑💻 About Me
I'm a Full Stack Engineer with 3.5+ years of experience building secure, scalable web and mobile applications using .NET (C#), React, Angular, SQL Server, MySQL and PostgreSQL.
I have strong experience in REST API development, database optimization, cloud deployment and OWASP security practices, and a proven ability to deliver end-to-end solutions from design to production with a focus on performance, security and reliability.
Currently I build production AI features — MCP servers, RAG pipelines and agents on OpenAI and Azure AI Foundry — with a focus on cost control and security. That includes exposing 100+ ERP and payroll tools to AI agents, integrating AI services into existing .NET Framework systems without changing core business logic, and reducing token cost through caching, context budgeting and per-tenant caps.
What I focus on:
- Secure .NET (C#) APIs, ASP.NET MVC and backend service development.
- React and Angular frontends with Tailwind CSS, TypeScript and responsive UI.
- REST API development, SQL Server / MySQL / PostgreSQL modelling and query tuning.
- Microsoft Azure, Azure DevOps, CI/CD pipelines, Docker, Kubernetes and Linux.
- Production AI: MCP servers, RAG pipelines and agents on OpenAI and Azure AI Foundry.
- OWASP Top 10 secure coding, authentication, authorization and secure API design.
- Cost-aware AI engineering: caching, context budgeting and per-tenant caps.
I have delivered work across enterprise web applications, internal portals, IoT access-control platforms, eCommerce, analytics dashboards and AI-assisted support tooling. I enjoy owning a product from architecture and database design through deployment and continuous improvement, and I'm open to full-stack, .NET, React, cloud and AI engineering roles — remote or hybrid.
💼 Experience
Three and a half years of delivering production software — from enterprise .NET applications and React frontends to Azure cloud infrastructure and AI agents.
Adaptive Bizapp Systems
Tiruchirappalli, Tamil Nadu, India · Hybrid
- Built an MCP server and RAG pipeline over ERP and payroll data (.NET Framework, FastAPI, FastMCP), exposing 100+ tools to AI agents.
- Integrated AI services with existing .NET Framework ERP and payroll applications without altering core business logic.
- Built proactive issue ticketing and a RAG assistant for the support team, reducing repetitive client issues.
- Deployed containerised agents on Docker using OpenAI and Azure AI Foundry, with role-based access, Key Vault secrets, prompt-injection checks and per-tenant rate limits.
- Reduced token usage and model cost through caching, context budgeting and per-tenant caps.
SCION
Thanjavur, Tamil Nadu, India · Hybrid
- Developed and maintained secure backend services using .NET Core (C#), SQL Server and Redis, improving system performance and reliability.
- Built responsive web applications using React, fully integrated with REST APIs and cloud services.
- Designed and deployed Azure cloud infrastructure and CI/CD pipelines with Azure DevOps, reducing deployment time and manual errors.
- Implemented OWASP Top 10 security practices, including secure authentication, input validation and API hardening.
UBTIINC
Chennai, Tamil Nadu, India · Remote
Progressed from Intern → Trainee → Junior Software Engineer.
- Built an internal Employee Management Portal from scratch to production using .NET Core and Angular.
- Designed and developed a full ESG Dashboard using .NET and SQL Server.
- Optimized application performance and ensured secure data handling.
Sirius Computer Solutions (CDW)
Chennai, Tamil Nadu, India · Remote
- Built responsive web applications with React, REST APIs and cloud services as part of a full-stack JavaScript internship.
🚀 Projects
Selected work across enterprise operations, IoT security, analytics and commerce — most of it delivered end-to-end, from architecture to production support.
Warehouse Management System
AdaptiveWarehouse management system built on .NET Core and ASP.NET MVC to support day-to-day warehouse operations.
.NET Core · ASP.NET MVCPrivate projectIoT Smart Security & Locker Access Control (Vsafe)
SCIONSecure IoT access-control application with a .NET Core backend, real-time device communication, user authentication and OWASP-compliant security practices.
.NET Core · IoT · OWASPPrivate projectESG Analytics Dashboard
UBTIINCData-driven dashboard that visualises environmental, social and governance metrics for internal stakeholders.
.NET · SQL ServerPrivate projectSecure eCommerce Web Application
SCIONFull-stack eCommerce application with secure user authentication, product management, cart and admin portal.
.NET Core · React · SQL ServerPrivate projectSJCET College Website
2023Built the St. Joseph's College of Engineering and Technology website and its department subdomains.
React · PHP · MySQLLive website ↗🧰 Tech Stack
💻 Languages : C#, JavaScript, TypeScript, SQL
🌐 Frontend : React, Angular, Tailwind CSS, HTML5, CSS3
⚙️ Backend : .NET Core (C#), ASP.NET MVC, RESTful APIs, FastAPI
🤖 AI Systems : MCP servers, RAG pipelines, LLM integration, OpenAI, Azure AI Foundry
🛢️ Databases : SQL Server, MySQL, PostgreSQL, Redis
☁️ Cloud/DevOps : Microsoft Azure (App Services, Azure SQL, Blob Storage), Azure DevOps,
CI/CD Pipelines, Docker, Kubernetes, Linux
🔐 Security : OWASP Top 10, Authentication & Authorization, Secure API Design
🛠️ Tools : Git, Firebase, Postman, Agile/ScrumFrontendBackendAI SystemsDatabasesSecurityCloud & DevOpsTools & Others
Day to day I work across the .NET and React/Angular stack, backed by SQL Server and Azure — and increasingly by MCP, RAG and agentic AI services that make those systems smarter without compromising security.
🎓 Education
B.E. Computer Science & Engineering
St. Joseph's College of Engineering and Technology, Thanjavur, Tamil Nadu.
Foundation for the engineering work I do now: software design, databases, networking and applied computer science.
📜 Certifications & Awards
Certifications
- Full Stack Development · ICT (IBM)
- Full Stack JavaScript · Sirius (CDW)
- Full Stack Development · Udemy
Awards & Recognition
- Best Employee of the Quarter — SCIONAwarded for outstanding performance, system optimization and delivering high-impact production features.
- Spotlight Award — UBTIINCRecognized for exceptional individual contribution to critical project delivery and performance improvements.
📬 Contact
Based in Tiruchirappalli, Tamil Nadu, India. Open to full-stack, .NET, React, Azure and AI engineering roles — remote or hybrid. The fastest way to reach me is email or LinkedIn.