// Full Stack Engineer — Optum

Sunil Kumar

I build enterprise software end-to-end — .NET / C# back ends, React front ends, microservices and APIs on the cloud — and I use AI to build faster.

View my work Get in touch

C#.NETASP.NET CoreReactMicroservicesSQL ServerAWSDockerRedisRabbitMQOAuth 2.0Azure ADJavaSpring BootGenerative AI

About

I'm a full stack engineer currently at Optum, working in .NET / C#. Before that, I was a Senior Software Engineer at In Time Tec, where I shipped enterprise systems for HR technology, insurance, and authentication — and learned to care as much about architecture and performance as about the features themselves.

My sweet spot is the whole stack: designing clean service boundaries, writing fast APIs, wiring up secure auth, and building React front ends that people actually enjoy using. Lately I've been folding AI-assisted development into everything I do — from scaffolding to refactoring.

Longer term, I'm interested in the intersection of engineering and product — building systems, and eventually building things of my own.

Currently

RoleFull Stack Engineer
CompanyOptum
Focus.NET / C#, React
BasisLinkedIn ↗

Experience

Full Stack Engineer · Optum

Jul 2026 — Present

Contributing to a healthcare appeals and grievance tracking system built on .NET, Angular, and microservices architecture.

▸Contributed to development of a healthcare appeals and grievance tracking system utilizing .NET, Angular, and microservices architecture
▸Implemented generative AI solutions to enhance user experience and streamline processes
▸Collaborated in an Agile environment, ensuring timely delivery of high-quality software products
▸Leveraged SQL and SSMS for efficient database management and data retrieval

Senior Software Engineer · In Time Tec

Prior — Jul 2026

Built enterprise applications across HR technology, insurance, and authentication — from .NET microservices to React front ends and Java/Spring Boot backend services.

▸Improved API performance by ~100% in relevant services
▸Cut manual HR reporting effort by ~70% through automation
▸Reduced operational effort ~50% for insurance workflows
▸Built secure authentication (OAuth 2.0, JWT, Azure AD SSO) and event-driven systems with RabbitMQ
▸Shipped Power BI dashboards and adopted AI-assisted refactoring

Projects

Modernization · Architecture

Idaho Digital Learning Alliance↗

Modernized architecture for a statewide online-learning platform: .NET 10 Web API microservices with a React front end, hardened with OAuth 2.0, JWT, and SSO — secured secrets in AWS, cached with Redis, and validated end-to-end with FluentValidation and Serilog.

.NET 10ReactMicroservicesOAuth 2.0 / SSOAWSRedisEF Core

Enterprise platform · Automation

HRMS Management System↗

Enterprise HRMS built on .NET 8 microservices with Clean Architecture and database-per-service, fronted by React. Azure AD JWT auth, RabbitMQ event-driven background workers, Power BI reporting, and generative-AI-assisted development throughout.

.NET 8ReactClean ArchitectureRabbitMQAzure ADPower BIGenAI

Insurance · Backend services

Insurance Order Management — BCI↗

Backend services for insurance order workflows at Blue Cross of Idaho — customer records, policy document delivery, and workflow automation on Java / Spring Boot with SQL tuning.

JavaSpring BootSQL ServerWorkflow automation

Skills

Backend & Architecture

C#.NET 8 / .NET 10ASP.NET Core Web APIEntity Framework CoreMicroservicesClean ArchitectureSOLIDRepository PatternEvent-Driven ArchitectureBackground Workers

Frontend

ReactJavaScriptREST API integration

Data & Messaging

SQL ServerStored ProceduresSQL OptimizationRabbitMQRedisPower BI

Cloud & Security

AWSAWS Secrets ManagerDockerOAuth 2.0JWTAzure ADSSO

Java & AI

JavaSpring BootGenerative AIPrompt EngineeringGitHub CopilotCursor

Achievements

2nd Runner-Up — RTU Hackathon 2021

Rajasthan Technical University hackathon, out of teams across the university. Won a ₹16,999 cash prize.

Internal Hackathon Winner — In Time Tec

First place among ~250 trainee engineers; the win contributed to an early promotion to Junior Software Engineer.

Scaler Academy — Full Stack Program

Completed the Scaler Academy Full Stack Engineer program, strengthening system design and full-stack depth.

06 — Contact

Let's build something.

Whether it's engineering, architecture, or an idea worth discussing — my inbox on LinkedIn is open.

Connect on LinkedIn Scaler Profile ↗