Sundar Mrl

.NET Developer with 3.7 years of experience building and supporting REST/SOAP APIs and enterprise web applications in C#, ADO.NET, ASP.NET Core, ASP.NET Core Web API, ASP.NET Framework API and Entity Framework, with SQL Server and PostgreSQL. Delivered web chatbot, WhatsApp bot and live-agent integrations for banking and utility clients (CUB, ESAF, SIB, CBD, OWWSC), including JWT authentication, IIS deployment, and UAT/production support. Comfortable working directly with client teams on requirements, releases and issue resolution.

Moved into software development from manufacturing quality engineering after C# .NET developer training.

Software Developer - Sunsmart Technologies - Chennai, India

(2023-02 - 2026-09)

Banking & Utility Chatbot Projects—CUB, ESAF, SIB, CBD, OWWSC

• Web Chatbot: Developed and maintained backend APIs (C#, ASP.NET Core Web API & ASP.NET Framework API, SQL Server) for customer-facing web chatbots for City Union Bank (CUB), ESAF Bank and Sharjah Islamic Bank (SIB).
• WhatsApp Bot: Delivered the WhatsApp Bot for OWWSC, a utility-sector customer-service channel, integrating the messaging platform with client backend APIs.
• Live Agent (CBD): Built live-agent initiation, JWT-based customer authentication (token generation, claim validation, expiry checks) and chat-session API integration for Commercial Bank of Dubai (CBD).
• Integrations: Integrated REST, SOAP and XML/JSON third-party and vendor services with internal systems, including NLP workflow and payment gateway (Razorpay) APIs.
• CRM & LMS Ticketing—ESAF Bank
• Developed a customer-query ticketing application integrating CRM and LMS modules for ticket creation, tracking and resolution.
• Built backend APIs and data workflows for CRM and LMS features using SQL Server/PostgreSQL stored procedures and complex queries.
• Deployment, Hosting & Security
• Configured IIS sites and web.config, deployed applications to UAT and production, and resolved environment and endpoint issues; used Git/GitHub and Jenkins for build and release workflows.
• Remediated VAPT findings on web applications and APIs (security headers, endpoint exposure, hosting configuration).
• Worked directly with client teams on requirement analysis, 2-tier/3-tier design decisions, deployment support and issue resolution; tested and documented APIs with Postman.

Junior Engineer (Quality) - Vignesh Polymers India Pvt. Ltd. - Vallam, Chennai

(2021-08 - 2023-01)

• Worked as online quality engineer and shift in-charge for in-process quality and PDI; approved machine-running parts against master samples.
• Prepared FML and mold temperature monitoring reports as per the control plan.

Quality Control & Quality Assurance - Delphi-TVS Technologies Pvt. Ltd. - Oragadam

(2019-09 - 2021-09)

• Ensured product and process quality and reduced PPM through continuous improvement using SPC.
• Monitored 4M changes and abnormal situations and tracked them to customer end with mitigation plans.

B.E. - Mechatronics - Hindustan College of Engineering & Technology (2014 - 2018)

C#.NET Developer Training Course - Accord InfoMatrix, Little Mount, Chennai (2022-09 - 2023-01)