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ISHU RAJAN

@ishurajan

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.NET backend engineer with 3 years at R1RCM building production Web APIs and leading legacy modernisation.

India

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What I'm looking for

Should be able to contribute in System Design Discussions
Should be able to participate in System Development

At R1 RCM, I delivered a zero-downtime migration of legacy ASP.NET modules to .NET Core Web APIs, with an approximately 8% improvement in system performance. I also implemented JWT authentication and role-based access control across modernized API surfaces.

I rebuilt the cash-posting matching rule engine by migrating MS-SQL stored procedures to a .NET console application. Using Dapper, I decomposed the stored procedure logic into queries across two Cron-job-driven pipelines and designed managed-batch ingestion and database write-back for production volumes of hundreds of millions of rows.

Earlier at R1 RCM, I improved inventory searches from 7–8 minutes to seconds and automated Account Release with T-SQL stored procedures. I also developed an AI-assisted summary module and a Selenium framework that shortened manual testing from three days to hours. My core stack includes C#, .NET Core, Dapper ORM, MS SQL Server, and Docker.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

R1 RCM

Dec 2025 - Present (10 months)

• Led zero-downtime migration of legacy ASP.NET modules to .NET Core Web APIs (Dapper/Docker), boosting performance ~8% with JWT/RBAC security.
• Rebuilt cash-posting engine via .NET console apps and Dapper-driven SQL queries, scaling cron pipelines to ingest 100M+ rows with managed batching.

MS SQL Server

Associate Software Engineer

R1 RCM

Aug 2023 - Dec 2025 (2 years 4 months)

• Slashed inventory search times from 7-8 minutes to seconds via dashboard data visualizations; built AI summary module boosting team efficiency ~4%
• Saved 1.5-2 mins per operation via automated T-SQL procedure; trimmed daily search latency by ~20-30s via optimized filters
• Cut manual build verification & regression testing from 3 days to hours by engineering robust Selenium automation framework

.NET

Education

Degrees, certifications, and relevant coursework

Microsoft

Microsoft Certified: Azure Fundamentals, Azure Fundamentals

Grade: NA

Activities and societies: NA

Nov 2025

GL Bajaj Institute of Technology and Management

Bachelor of Technology - BTech, Information Technology

2019 - 2023

1st Year: Won the 1st prize in the contest called "code war", organized by the department of MCA.
2nd Year: I got a chance to get training in SDLC from HCL under their program called HCL SUNSHINE.
3rd Year: I served as a Cybersecurity Team Lead of Innovo Infinity club of college. Also served as a member of the event management team. During this time we have conducted webinars to promote cyber awar

Bal Bharati Public School, Noida

12th, PCM with Computer Science

2018 - 2019

Created a fun, command-line interface (CLI) game using Borland C++ 5.0J Compiler. The game simulates a simple, yet engaging cricket match experience based on user input.