Vijayakrishna is available for hire
Hire VijayakrishnaVijayakrishna Nunna
Verified Expert in Engineering
Full-stack Developer
Boston, United States
Toptal member since August 5, 2026
Bio
Vijaya Krishna is a senior full-stack developer with over 10 years of experience in .NET and cloud-based solutions for clients, including the Commonwealth of Massachusetts, Brown Brothers Harriman, and UnitedHealth Group. His primary expertise is in .NET Core, Angular, and Azure for finance, healthcare, and government industries, where he thrives in Agile environments. Vijaya Krishna designed an agentic AI workflow using Azure OpenAI to automate multi-step case processing.
Portfolio
Commonwealth of Massachusetts
C#, Clean Architecture, Microservices Architecture, GitHub Copilot, Azure AI...
Brown Brothers Harriman
.NET, HTML5, CSS3, Bootstrap, Microservices, MVC architecture
UnitedHealth Group
C#, HTML5, CSS3, Bootstrap, .NET, Microservices, MVC architecture
Experience
- C# - 10 years
- CSS3 - 10 years
- .NET - 10 years
- HTML5 - 10 years
- HTML - 8 years
- Angular - 8 years
- TypeScript - 8 years
- Clean Architecture - 5 years
Preferred Environment
Azure DevOps, Git, Jira, Docker, Kubernetes, Visual Studio, Azure Boards, Postman, Swagger, Subversion (SVN)
The most amazing...
...AI workflow I've designed is an agentic solution using Azure OpenAI that automated multi-step case processing for a state government agency.
Work Experience
Senior .NET Developer
2025 - PRESENT
Commonwealth of Massachusetts
- Drove Agile/Scrum delivery through sprint planning, daily stand-ups, sprint reviews, and retrospectives, tracking work items in Azure Boards and coordinating with cross-functional teams to consistently ship high-quality, on-time releases.
- Architected enterprise-grade applications on .NET 10, ASP.NET Core Web API, and C#, applying clean architecture and microservices architecture principles to maximize scalability and long-term maintainability.
- Implemented GitHub Copilot and Azure AI-assisted code review across the development team, accelerating feature delivery on Appian and .NET modules while maintaining secure coding standards for government systems.
- Designed an agentic AI workflow using Azure OpenAI and Model Context Protocol (MCP)-based tool integration to automate multi-step case processing within Appian, enabling the agent to retrieve records and apply business rules.
- Engineered responsive, accessible front-end experiences using Angular 20, TypeScript, RxJS, HTML5, CSS3, and Bootstrap, modernizing legacy state agency interfaces for improved usability.
- Developed select React-based modules and reusable components for newer state agency dashboards, integrating them with existing Angular 20 applications during an incremental front-end modernization effort.
- Built and maintained low-code Appian 24.4x/25.x applications leveraging SAIL, records, process models, expression rules, decision rules, and integration objects to automate high-volume government business processes.
- Unified Appian with ASP.NET Core Web APIs and external state systems through REST API integrations, establishing seamless, real-time data exchange across multiple agency platforms.
- Engineered reusable connected systems, Web APIs, and integration objects within Appian to consume secure internal and 3rd-party services, cutting redundant integration effort across teams.
- Elevated workflow transparency and operational reporting by configuring Appian Records, Record Actions, Record Types, and Process Reports for real-time process insight.
Technologies: C#, Clean Architecture, Microservices Architecture, GitHub Copilot, Azure AI, Appian, Angular 20, TypeScript, RxJS, HTML5, CSS3, Bootstrap, React, Sails.js, Electronic Health Records (EHR), .NET, Angular 14
Senior Full-stack Developer
2023 - 2025
Brown Brothers Harriman
- Utilized Agile SDLC methodologies for continuous delivery and iterative development, ensuring flexibility in adapting evolving business requirements and timely feature releases for the client portal management application.
- Designed and implemented a microservices architecture to ensure scalability, security, and fault tolerance, optimizing system performance and integration in the financial data management platform.
- Developed backend services using C# and ASP.NET Core Web API, building robust RESTful services to interact with financial data and ensuring maintainable and secure data exchange.
- Leveraged ASP.NET Core Dependency Injection to improve the maintainability of backend services by promoting loose coupling and enhancing testability of business logic.
- Developed and optimized RESTful APIs using C# and ASP.NET Core, implementing asynchronous programming with async/await to enhance performance and scalability, ensuring efficient handling of high-volume financial data requests.
- Utilized Entity Framework Core to interact with relational databases, simplifying data access and ensuring efficient querying of financial data in SQL Server.
- Built a Retrieval-Augmented Generation (RAG) pipeline with Azure OpenAI and a vector database, integrated into a human-in-the-loop AI agent that answered client-portal account queries and escalated ambiguous requests.
- Evaluated LLM output quality using a lightweight prompt evaluation framework, tracking accuracy and hallucination rate for an internal AI assistant before production rollout, ensuring reliable responses for financial data queries.
- Developed Python scripts for automating data validation and reconciliation tasks across financial data pipelines, reducing manual processing time and improving data accuracy for downstream reporting.
- Ensured secure handling of sensitive financial data in compliance with PCI DSS standards, implementing encryption, access controls, and audit logging across client-facing APIs and data storage layers.
Technologies: .NET, HTML5, CSS3, Bootstrap, Microservices, MVC architecture
.NET Developer
2020 - 2023
UnitedHealth Group
- Implemented Onion architecture to separate business logic, user interface, and user input handling, enhancing maintainability and scalability of the applications.
- Worked on the healthcare data management and compliance systems application, building dynamic and interactive user interfaces with Angular 14, improving user experience, and ensuring smooth integration with back-end services.
- Developed and optimized enterprise-level RESTful APIs with C#, ensuring secure, efficient system integration with other healthcare platforms and services.
- Delivered high-quality web services using ASP.NET Core, focusing on modular design, security, and performance to meet the needs of healthcare data management.
Technologies: C#, HTML5, CSS3, Bootstrap, .NET, Microservices, MVC architecture
.NET Web Developer
2018 - 2020
Ingram Micro
- Designed and deployed microservices to modularize billing functions, enabling scalable and independent management of services and improving system resilience.
- Implemented MVC architecture to structure the application for scalable and maintainable code, enhancing user experience and separation of concerns.
- Styled and structured web pages using HTML5 and CSS3, ensuring responsive design, modern aesthetics, and a seamless user experience across different devices and browsers.
- Developed client-side functionality using TypeScript for interactive and real-time features.
- Developed dynamic and responsive web applications using Angular.
Technologies: Microservices, MVC architecture, HTML5, CSS3, TypeScript, Angular, Bootstrap, .NET
NET/J2EE Developer
2016 - 2018
CSS Corp
- Implemented Waterfall SDLC methodology, ensuring structured phased project management from requirements gathering through to final delivery adhering to timelines and stakeholder expectations.
- Designed responsive front-end interfaces using HTML, CSS, JavaScript, jQuery, Ajax, optimizing the user experience across devices.
- Developed web applications using the .NET Framework, including WebForms, driving improvements in both front-end user experience and back-end functionality.
- Designed SOAP Web Services, facilitating secure communication between distributed systems, enhancing integration capabilities across platforms.
- Utilized ADO.NET for seamless database access, improving performance, and ensuring reliable interactions with SQL-based data sources.
Technologies: HTML, CSS, JavaScript, jQuery, Ajax, Telerik WebForms Controls, ADO.NET, HTML5, CSS3, Bootstrap, .NET, MVC architecture
Experience
Appian Workflow Automation Platform
I designed and developed enterprise-level workflow automation solutions using Appian to simplify business processes and improve operational efficiency. I built user-friendly front-end interfaces, dynamic forms, dashboards, and process workflows to deliver seamless experiences for business users.
My involvement included analyzing business requirements, designing Appian applications, configuring process models, creating reusable components, integrating external systems through REST APIs, and optimizing application performance. I developed responsive user interfaces with a focus on usability, accessibility, and efficient data management. I implemented integrations with back-end services, databases, and cloud-based systems while following best practices for security, scalability, and maintainability. I also collaborated with business stakeholders and technical teams throughout the development lifecycle, from solution design and development to testing and deployment.
The project improved workflow visibility, reduced manual processes, and enabled faster decision-making through automated business processes and intuitive digital experiences.
My involvement included analyzing business requirements, designing Appian applications, configuring process models, creating reusable components, integrating external systems through REST APIs, and optimizing application performance. I developed responsive user interfaces with a focus on usability, accessibility, and efficient data management. I implemented integrations with back-end services, databases, and cloud-based systems while following best practices for security, scalability, and maintainability. I also collaborated with business stakeholders and technical teams throughout the development lifecycle, from solution design and development to testing and deployment.
The project improved workflow visibility, reduced manual processes, and enabled faster decision-making through automated business processes and intuitive digital experiences.
Education
2016 - 2019
Bachelor's Degree in Computer Science and Engineering
NEC - AP, India
Certifications
OCTOBER 2025 - PRESENT
Appian Certified Associate Developer
Appian
Skills
Libraries/APIs
RxJS, React, Node.js, jQuery, Azure API Management, SignalR, WebRTC, Log4Net, REST APIs
Tools
GitHub Copilot, RabbitMQ, Azure Key Vault, Git, Jira, Visual Studio, Postman, Subversion (SVN), SonarQube, xUnit, Karma
Languages
C#, TypeScript, HTML5, CSS3, HTML, GraphQL, CSS, JavaScript, C#.NET, Java
Frameworks
.NET, Angular 14, Angular, Bootstrap, Angular Material, JSON Web Tokens (JWT), Sails.js, ADO.NET, Swagger, Jasmine
Paradigms
Clean Architecture, Microservices Architecture, Microservices, Azure DevOps, Dependency Injection, HL7 FHIR Standard, Agile Software Development
Platforms
Azure, Appian, AWS IoT, Docker, Kubernetes, AWS Lambda, Oracle
Storage
MongoDB, PostgreSQL, Azure Cosmos DB, Redis, SQL Server Integration Services (SSIS), SQL Server Reporting Services (SSRS), Database Integration
Other
MVC architecture, SQL Server, Azure AI, Angular 20, Kafka, T-SQL, Azure Blob Storage, Electronic Health Records (EHR), Ajax, Telerik WebForms Controls, Azure Boards, Onion Architecture, HL7, Data, appian Designer, Appian Process Models, Workflow Automation, Business Process Management (BPM), User Experience (UX), Azure Cloud Integration
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