.NET Full Stack Developer

TymblHub; Mumbai; On-site; INR 2,000,000 - 3,800,000; Full time

Job summary

CRISIL is seeking a Senior .NET Full Stack Developer to modernize and support enterprise apps using ASP.NET 4.8, .NET Core, and React. You will migrate legacy modules, build REST APIs, and ensure scalable performance across Windows Services and Oracle databases.

The role requires strong problem-solving, production support skills, and hands-on experience with AWS S3 integration and modern UI development using React.js, TypeScript, and Bootstrap.

Qualifications

• 5–8 years of experience in .NET Full Stack development in enterprise environments.
• Proven ability to modernize and migrate applications from ASP.NET 4.8 to .NET Core and React.
• Strong database experience with Oracle 19c and PostgreSQL; SQL/PLSQL tuning expected.
• Experience with AWS S3 storage integration and RESTful services is preferred.

Responsibilities

• Develop, maintain, and modernize apps using ASP.NET 4.8, .NET Core, and C#.
• Design/consume REST APIs and build React-based front ends.
• Migrate existing ASP.NET pages to React components and modern architecture.
• Provide L2/L3 production support and perform root cause analysis.
• Collaborate on Windows Services, batch processing, and deployment activities.
• Develop and optimize Oracle SQL, PL/SQL, and database objects.

Skills

C#

ASP.NET MVC

ASP.NET Web Forms

.NET Framework 4.8

.NET Core / .NET 6+

Entity Framework

REST API Development

Web API

LINQ

React.js

JavaScript

TypeScript

HTML5

CSS3

Bootstrap

Oracle 19c

PostgreSQL

SQL

PL/SQL

Query Optimization

Performance Tuning

AWS S3

JSON/XML Processing

Tools

Azure DevOps

ADO Repositories

CI/CD Pipelines

Job description

# .NET Full Stack DeveloperCrisilPosted on October 9, 2026---Experience5 - 8 yrsJob LocationMumbai, IndiaVacancy1DesignationFull Stack DeveloperJob TypeONSITE---## Job Description**Role:****Senior .NET Full Stack Developer****Technology:****ASP.NET, .NET Core, React, Oracle****Experience:** 5-8 Years**Work Location:** HYD, Mumbai, India## Job SummaryWe are seeking an experienced **Senior .NET Full Stack Developer** to support, enhance, and modernize a portfolio of enterprise applications. The candidate will be responsible for maintaining applications built on **ASP.NET 4.8** and **.NET Core**, supporting existing **Windows Services**, and driving UI modernization initiatives using **React.js**.The application landscape consists of **2 applications already migrated to .NET Core** and **2 applications currently running on ASP.NET 4.8**, which will be migrated over time. The role also involves supporting **Oracle 19c databases**, **ARP Authentication**, **SpreadsheetGear-based Excel processing**, **AWS S3 file storage integrations**, and day-to-day production support activities.The ideal candidate should possess strong development, troubleshooting, modernization, and support experience in enterprise application environments.## Key Responsibilities### Application Development & Modernization* Develop, maintain, and enhance applications built on **ASP.NET 4.8**, **.NET Core**, and **C#**.* Support and enhance 2 existing **.NET Core** applications.* Maintain and modernize 2 **ASP.NET 4.8** applications.* Participate in migration initiatives from **ASP.NET 4.8** to **React** and **.NET Core** architecture.* Design and develop **REST APIs**, business services, and reusable components.* Implement scalable, secure, and high-performance application solutions.### Front-End Development* Develop modern and responsive user interfaces using **React.js**.* Convert existing **ASP.NET** pages into **React**-based components.* Work with **JavaScript**, **TypeScript**, **HTML5**, **CSS3**, and **Bootstrap**.* Improve application usability, accessibility, and performance.### Production Support* Provide L2/L3 production support for business-critical applications.* Investigate and resolve production issues within **SLA** timelines.* Perform root cause analysis (**RCA**) and implement preventive measures.* Analyze application logs, database issues, and integration failures.* Support application releases, deployments, and post-deployment validation.### Windows Services Support* Support and enhance existing **Windows Services**.* Troubleshoot service failures, scheduling issues, and processing bottlenecks.* Ensure continuous availability and stability of batch processing services.### Oracle Database Development* Develop and maintain **Oracle 19c** database objects.* Create and optimize Stored Procedures, Packages, Views, Functions, and Queries.* Perform query optimization and database performance tuning.* Support data correction and migration activities.### Excel & Spreadsheet Processing* Support **SpreadsheetGear**-based functionality.* Maintain **Excel** import/export and transaction processing modules.* Troubleshoot business-critical data upload and reporting issues.* Support bulk data loading and file generation processes.### Cloud & File Storage Integration* Support integrations with **AWS S3** file storage.* Develop and maintain file upload, download, archival, and processing solutions.* Troubleshoot cloud storage connectivity and file-processing issues.### Security Compliance & Vulnerability Management* Analyze and remediate findings from: + Vulnerability Assessment (VA) + Dynamic Vulnerability Assessment (DVA) + Security Scans + Code Review Findings* Work closely with Information Security teams to resolve security vulnerabilities.* Ensure applications comply with organizational security and compliance standards.* Perform security fixes and validation before production deployment.### Source Control & DevOps* Manage source code using **Azure DevOps (ADO Repositories)**.* Participate in code reviews and pull request processes.* Support **CI/CD** pipelines and release activities.* Follow enterprise development standards and branching strategies.## Required Technical Skills### Backend* **C#*** **ASP.NET MVC/Web Forms*** **ASP.NET Framework 4.8*** **.NET Core /.NET 6+*** **Entity Framework*** **REST API Development*** **Web API*** **LINQ**### Frontend* **React.js*** **JavaScript*** **TypeScript*** **HTML5*** **CSS3*** **Bootstrap**### Database* **Oracle 19c/PostgreSQL*** **SQL*** **PL/SQL*** **Query Optimization*** **Performance Tuning**### Cloud & Integration* **AWS S3 File Storage Integration*** **REST APIs*** **JSON/XML Processing**