.Net Developer C#

Keerthana Karla

Senior Full Stack .Net Developer

***************@*****.*** 814-***-****

www.linkedin.com/in/keerthana-karla-95aa46287

PROFESSIONAL SUMMARY:

Over 10+ years of professional experience in developing client-server and web-based applications using various versions of the Microsoft .NET Framework (2.0 to 4.6, .NET 5, .NET 6), C#, VB.NET,ASP.NET,ADO.NET,.NETWeb Services, HTML, JavaScript, CSS, LINQ, AJAX, MVC, IIS, and JSON.

Expertise in the Software Development Life Cycle (SDLC), including requirement analysis, system architecture, coding, testing, deployment, and documentation under Agile and Waterfall methodologies.

Extensive experience in developing N-Tier applications using .NET Core, MVC, ASP.NET, VB.NET, ADO.NET, and SQL Server, with expertise in C# 10.0, multithreading, and collections, as well as AJAX, LINQ, WCF, XML, and Web Services.

Skilled in Razor view engine, MVVM design pattern, PRISM framework, ASP.NET MVC (3.0/4.0), and ASP.NET Web API for building RESTful services, securing APIs with OAuth and JWT, and integrating REST and SOAP-based services.

Proficient in Object-Relational Mapping (ORM) frameworks such as Entity Framework, Entity Framework Core, and ADO.NET, with expertise in handling XML and JSON for seamless data exchange.

Hands-on experience with Microsoft Azure, including Azure API Management, Azure App Services, and Azure Active Directory Authentication, ensuring secure web applications and APIs.

Experience in developing Single Page Applications (SPA) with Angular and React, utilizing TypeScript, JavaScript, jQuery, Bootstrap, and CSS frameworks to create responsive and dynamic user interfaces.

Extensive experience working with relational and NoSQL databases such as SQL Server, PostgreSQL, and MongoDB, with expertise in SQL queries, stored procedures, functions, cursors, triggers, and PL/SQL programming.

Experienced in Azure DevOps for CI/CD pipelines, streamlining development, build, and deployment processes for high-efficiency application delivery.

Proficient in .NET Core testing frameworks like XUnit and NUnit, and skilled in API testing and automation using Postman, SOAP UI, and Swagger UI.

Well-versed in version control systems such as Git, SVN, and TFS, with experience in code quality assurance using various tools to maintain industry standards.

Proven experience in cloud-based development using Microsoft Azure and AWS, incorporating services such as Azure Functions, App Services, AKS, AWS Lambda, S3, RDS, DynamoDB, and IAM to build universally available and scalable applications.

TECHNICAL SKILLS:

Programming Languages

C++, C#, VB.Net

Web Technologies

HTML5, XHTML, DHTML, AJAX, CSS3, JavaScript, JSON, Bootstrap, jQuery, Angular, React, Node JS, TypeScript

Databases

MS SQL Server 2022/2016, Oracle 11g/10g/9i, MS Access, PL/SQL, T-SQL, PostgreSQL.

Technologies

ASP.NET, ASP.NET MVC (6.0/5.0/4.0), .Net Core, Web Services, WCF, Web API, ADO.Net, LINQ, Entity Framework 6.0/5.0/4.3, IIS 6.0/7.0/8.0

Version Control Tools

TFS, GITHUB, SVN.

Cloud Technologies

GCP, Azure (Azure app services, Azure Blob Storage, AKS, AKV), AWS (S3, EC2, Lambda).

Testing Tools

N-Unit, MS-Unit, X-Unit, Jasmine, Karma, Jest.

Reporting Tools

Crystal Reports, SSRS, SSIS

Servers

Windows Server, Microsoft IIS

PROFESSIONAL EXPERIENCE:

Express Script, St. Louis, MO JUN2023 – PRESENT

SENIOR .NET FULL STACK DEVELOPER

Developed enterprise-grade ASP.NET Core 8.0 Web API microservices using Agile (Scrum) methodologies handling insurance claims, ensuring scalable and high-performance processing of patient and provider data.

Developed and maintained healthcare applications using C# and .NET, ensuring compliance with HIPAA regulations and secure handling of PHI (Protected Health Information).

Optimized healthcare web applications using .NET Core for secure and efficient management of patient records, appointments, and billing systems in the healthcare industry.

Designed and optimized data access layers using ADO.NET for healthcare insurance applications, ensuring secure, high-performance database interactions for claims processing.

Integrated with external EHR systems to retrieve real-time data on patient history, validate the authenticity of claims, and process the details accordingly.

Utilized FHIR APIs to retrieve, update, and process patient health records while ensuring compliance with HIPAA and other regulatory standards.

Developed real-time healthcare applications using SignalR and .NET Core, allowing healthcare professionals to monitor live data from wearable devices and patient monitors.

Worked extensively with JSON data formats for processing EDI 834 (enrollment), EDI 835 (payment/remittance), claims processing, and invoicing in healthcare applications.

Configured and deployed microservices on Microsoft Azure using Azure API Gateway to manage request routing, security policies, and traffic control.

Developed microservices architecture using Azure Kubernetes Service (AKS) with Kubernetes for container orchestration.

Leveraged GraphQL for flexible API queries and Azure Service Bus for reliable message queuing and integration.

Implemented secure authentication and authorization mechanisms using OAuth 2.0 and JWT for .NET Core-based healthcare applications to protect sensitive patient data.

Utilized Angular, Bootstrap, HTML5, CSS3, and JavaScript ES6+ for building modern, ensuring responsiveness across different devices and browsers.

Migrated dynamic web interfaces from Angular 14 to Angular 17, using jQuery to offer a responsive and user-friendly frontend experience, while improving application performance and integrating new capabilities.

Implemented RxJS for state management to handle real-time notifications and data updates across different Angular components.

Designed and optimized data persistence layers using Entity Framework Core 8.0 and SQL Server to create and manage complex database schemas, optimizing queries and indexes for better performance.

Administered SQL queries and performance tuning using SQL Server Management Studio optimize both backend and frontend applications.

Implemented MongoDB as a NoSQL database for storing and managing unstructured healthcare data, including claims, patient records, and prescription history.

Integrated RabbitMQ as a messaging broker for real-time event-driven processing of healthcare transactions, claims, and patient notifications.

Wrote unit tests for backend services using xUnit 2.5.0, ensuring high test coverage and reliability.

Performed UI testing with Karma and Jasmine, ensuring Angular components worked as expected in various scenarios.

Used Postman, Swagger UI, and SOAP UI 5.7.0 for API testing, validating request/response structures and error handling.

Managed application lifecycle with Azure DevOps, including YAML Pipelines for CI/CD and version control using GitLab CLI.

Managed source code with Git&GitHub following GitFlow branching strategy to streamline development across multiple teams.

Used Visual Studio 2022 for full-stack development and debugging.

Used JIRA to track Agile sprints, manage tasks, and coordinate development efforts with product owners and business analysts.

Provided hands-on mentorship to junior developers and coordinated with cross-functional teams to promote best practices, facilitate code reviews, and ensure quality delivery of healthcare solutions

Environment: C# 10.0, ASP.NET Core, Angular 17, Vue.js 3.0, TypeScript, MSSQL 2019, NoSQL, Microsoft Azure (App Services, SQL Database, Functions, DevOps), Git, Terraform, Docker, Kubernetes (AKS), RESTful APIs, OAuth 2.0, JWT, RabbitMQ, FHIR.

Fanniemae, Plano, TX FEB2021 – MAY2023

.NET Full Stack Developer

Worked in an Agile environment using Scrum methodology, actively participating in sprint planning, daily stand-ups, and retrospectives to ensure continuous delivery of working software.

Utilized Jira for Agile project management, tracking development tasks, sprints, and progress.

Implemented an N-Tier approach to distribute the workload efficiently, improving system performance under high transactional loads.

Developed and deployed microservices using .NET Core 6.0 to handle financial transaction processing, data analysis, and risk management in a highly scalable and secure manner

Built scalable backend services using ASP.NET Core Web API and C#, ensuring high performance and scalability in processing large volumes of transactions

Developed and maintained scalable .NET applications for mortgage loan processing, automating workflows and integrating with various internal systems to enhance operational efficiency

Designed and developed MVC5 applications using Razor view engine for the front-end rendering and C# for business logic implementation.

Created RESTful Web Services to establish seamless communication between SSRS (SQL Server Reporting Services) and ASP.NET applications, enhancing the reporting capabilities within the system.

Implemented PCI-DSS security standards by tokenizing credit card transactions, ensuring sensitive payment data was stored securely.

Implemented Single Sign-On (SSO) and Multi-Factor Authentication (MFA) to enhance security while simplifying user access management across applications.

Developed customer-facing applications using Angular 12, HTML5, CSS3, JavaScript, and Bootstrap, improving the user interface utilizing responsive design techniques to ensure applications were mobile-friendly and accessible across different devices.

Developed front-end UI components such as grids, tables, and widgets in Angular, improving data visualization and user interaction.

Optimized SQL Server performance by writing efficient stored procedures, triggers, and indexes, significantly improving query execution time.

Developed and optimized complex SQL queries, stored procedures, and views to process high-volume mortgage transactions and financial reports efficiently.

Implemented Kafka as a message queuing solution to support real-time processing of financial transactions, enabling seamless communication between various systems

Developed and managed serverless applications with Azure Functions for real-time mortgage data processing and reporting.

Integrated Azure Active Directory (Azure AD) to manage and secure user identities for Fannie Mae's applications, ensuring centralized authentication and authorization across multiple systems.

Integrated Azure Service Bus queues and topics to decouple services, enabling event-driven architecture that improved data flow and communication between internal and external stakeholders.

Integrated SignalR into Fannie Mae's platform to enable real-time communication for tracking loan application status updates, mortgage approval processes, and customer notifications, ensuring seamless user experiences.

Implemented OAuth 2.0 Authorization Code Flow to allow secure login and role-based access to sensitive financial applications at Fannie Mae.

Used Git for version control to manage and track changes in the codebase across multiple projects, ensuring efficient collaboration among development teams and providing an audit trail for all code changes.

Designed and maintained SSIS packages for data migration and integration between multiple systems, ensuring seamless data flow and consistency across various platforms.

Developed ATM Uptime Monitoring System by integrating batch processing to monitor the status of ATMs in real-time.

Environment: C#, ASP.NET Core, .NET Framework, MVC, Web API, Entity Framework Core, MSSQL, SSRS, SSIS, Angular, TypeScript, JavaScript, RESTful APIs, OAuth 2.0, JWT, Azure DevOps, Git, CI/CD, Docker, Kubernetes (AKS), Terraform, RabbitMQ, Azure Service Bus, HIPAA, PCI-DSS.

State of CA SFO, CA OCT 2019 – JAN2021

Sr. NET Developer

Led daily stand-ups, sprint planning, and retrospectives in an Agile environment, collaborating with cross-functional teams to deliver scalable, compliant solutions for state government clients.

Designed and developed web applications using ASP.NET MVC5 for back-end development and, dynamic front-end solutions, improving user engagement and system interactivity.

Built cross-platform mobile applications using Xamarin and C#, enabling native-like functionality on both iOS and Android and reducing time-to-market for mobile solutions.

Integrated Kendo UI components into the front-end, providing interactive, feature-rich user experiences and ensuring users could easily interact with complex data visualizations.

Implemented robust security measures in ASP.NET MVC using authentication and authorization mechanisms, ensuring that sensitive data was protected, and users were properly authenticated based on roles.

Developed Android applications with Android SDK, handling both the front-end and back-end integration to ensure seamless interaction between the mobile interface and server-side systems.

Leveraged advanced features of C#, such as collections, generics, extension methods, and delegates, to enhance code reusability, efficiency, and maintainability in the development process.

Implemented serverless solutions using AWS Lambda and DynamoDB, reducing infrastructure costs and improving application performance.

Utilized AWS IAM (Identity and Access Management) to configure role-based access control (RBAC) and ensure secure authentication and authorization.

Developed microservices-based applications using Docker containers and deployed them on Amazon Elastic Kubernetes Service (EKS) for high availability.

Implemented event-driven architectures using Amazon SNS and SQS, ensuring reliable asynchronous processing of state-level transactions.

Built responsive, user-friendly web applications for state government clients with React, ensuring real-time data display and interactive features that enhanced citizen engagement.

Designed and built dynamic and interactive web applications for citizens to access services like tax filing, health benefits enrollment, and voter registration using React.js.

Leveraged Redux for efficient state management in React applications, ensuring consistent data flow and seamless UI updates across complex state-level systems.

Implemented authentication and role-based authorization using .NET Membership, ensuring secure access control and protecting sensitive data across the application.

Used SQL indexing, query refactoring, and pagination techniques to handle large datasets efficiently in a React frontend.

Analyzed and optimized SQL queries for performance, reducing query execution time and improving overall system responsiveness for users accessing state services.

Utilized Git for source code management, enabling distributed version control and seamless collaboration among team members.

Managed critical hotfixes and patch releases for high-availability applications used by state government departments using GitHub’s branching strategy

Automated testing using Karma, Jasmine, Protractor (Angular), and NUnit for comprehensive unit and end-to-end tests, ensuring the application's reliability and stability after changes.

Environment: C#, ASP.NET MVC5, Angular, Xamarin,SQL, Android SDK, .NET Framework, MS Access 2010, Kendo UI, Bootstrap, HTML5, CSS3, JavaScript, RESTful APIs, .NET Membership, Multithreading, Karma, Jasmine, Protractor, NUnit, Selenium WebDriver.

Southwest Airlines, Dallas, TX Nov 2017– Aug 2019

.NET Developer

Built backend services using .NET Framework 4.6and C#, supporting critical airline operations and crew management, ensuring high availability and performance in mission-critical systems.

Developed secure RESTful APIs using ASP.NET Web API, enabling seamless system integration and ensuring data security for sensitive airline operations.

Built dynamic frontend with React, enhancing the user experience by providing a fast and responsive single-page application (SPA) with smooth navigation and real-time updates.

Integrated with SQL Server using Entity Framework 6.0 for efficient database management, including schema design, stored procedures, and performance tuning for optimized data access.

Connected external airline systems through SOAP and REST APIs, implementing OAuth 2.0 and OpenID Connect for secure authentication and authorization of sensitive data exchanges.

Automated build, test, and deployment processes using MS Build and AWS CodePipeline, ensuring continuous integration and deployment for efficient development cycles.

Managed source code with GitHub, and tracked project progress using Jira, enabling clear visibility and effective collaboration within the team.

Implemented unit tests with NUnit and MSTest, ensuring code reliability, stability, and early detection of defects through comprehensive test coverage.

Automated containerized application deployments using Docker and Kubernetes, ensuring scalability and high availability through managed container orchestration.

Utilized AWS SQS for message queuing, supporting real-time communication and event-driven architecture, ensuring system scalability and reliability in high-throughput environments.

Implemented real-time push notifications using AWS SNS, enhancing user engagement with timely updates and alerts within the airline management system.

Leveraged AWS Lambda for serverless functions, reducing infrastructure overhead by executing event-driven code in a highly scalable and cost-efficient manner.

Environment: .NET Framework 4.6, ASP.NET Web API, SQL Server, Azure DevOps, Docker, Kubernetes (AKS), EC2, S3, Lambda, API Gateway, RDS, DynamoDB, AWS IAM, AWS Secrets Manager, VPC, Route 53.

Hudda Infotech Private Limited Hyderabad, India DEC 2014– JULY 2017

Associate.NET Developer

Involved in gathering requirements specifications from the end clients.

Utilized C# and ASP.NET Core to design and implement scalable backend solutions that support enterprise applications, ensuring optimal performance and maintainability.

Followed a Waterfall approach for project planning and execution, enabling clear phase transitions and well-defined deliverables that ensured timely project completion.

Configured SQL Server to perform regular backups (full, differential, and transaction log) to ensure data availability and system recovery in case of failure.

Collaborated with cross-functional teams to design and maintain SQL database schemas for .NET applications, ensuring alignment with business requirements and scalability.

Assisted in setting up automated build and deployment pipelines using AWS CodePipeline and CodeBuild, streamlining the release process for faster updates.

Created interactive user interfaces with AngularJS, delivering responsive web applications that improve user experience and engagement.

Developed and integrated RESTful APIs to ensure smooth data exchange between front-end and back-end systems, enhancing overall application functionality.

Leveraged Git for version control to efficiently manage code repositories, facilitate collaborative development, and maintain a clear audit trail of changes.

Conducted regular code reviews and maintained thorough documentation, ensuring adherence to best practices and high-quality standards throughout the development lifecycle.

Environment: C#, .NET Core, ASP.NET MVC/Web API, MSSQL, Entity Framework Core, JavaScript, TypeScript,AWS, Angular.

EDUCATION: Bachelor’s in computer science engineering, Bharath University -TN 2010 -2014

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