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Jay Ni

@jayni

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Senior full stack engineer building scalable cloud-native systems with C#, Azure, and AI-driven automation.

United States

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What I'm looking for

I’m looking for a role where I can build scalable cloud-native platforms with C#/.NET and Azure, integrate AI/ML reliably, and improve system scalability, reliability, and developer productivity through strong architecture and testing.

I’m a Senior Full Stack Engineer with 10+ years of experience building scalable, cloud-native applications using C#, ASP.NET Core, and distributed systems. I focus on backend architecture, API development, performance optimization, and reliable, event-driven execution on Azure.

At Fidelity Investments, I designed and built a financial workflow platform that eliminated delays caused by manual transaction processing. I re-architected tightly coupled services into modular, service-oriented components with clear API boundaries, improving reliability under concurrent workloads.

I also drive practical AI/ML outcomes—integrating Python and OpenAI APIs to deliver document classification, summarization, and entity extraction. When AI outputs were inconsistent, I built structured prompt orchestration and validation layers in C# to normalize, retry, and verify results for stable, auditable production behavior.

Before that, at Indiana Farm Bureau Insurance, I engineered semantic search and summarization pipelines using embeddings and ML services, and orchestrated multi-step AI workflows across C# APIs and Python microservices. Across my roles, I’ve strengthened systems with strong testing (xUnit/NUnit, Moq, FluentAssertions) and modern engineering practices—so teams can ship faster with confidence.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

Fidelity Investments

Jan 2024 - Present (2 years 3 months)

Designed and built a financial workflow platform in C# and ASP.NET Core, re-architecting tightly coupled services into modular components with clearer API boundaries to improve reliability under concurrent workloads. Implemented AI/ML document classification using Python and OpenAI APIs and added structured prompt orchestration, validation, and event-driven processing with Azure Service Bus for st

C#ASP.NET Core Azure Service Bus OpenAI API Python Prompt Engineering Event Driven Architecture xUnit Moq CI CD

Software Engineer

Indiana Farm Bureau Insurance

Apr 2021 - Jan 2024 (2 years 9 months)

Built AI-enabled backend systems in C# and .NET 6, shifting from rigid rule logic to data-driven pipelines for improved adaptability and maintainability. Delivered semantic search and summarization pipelines using Python ML services and OpenAI embeddings, orchestrating multi-step AI workflows across C# APIs and Python microservices with robust retry and timeout handling.

C#Semantic Search OpenAI Embeddings ML AI Workflows Microservices NUnit Integration Testing

Software Development Engineer

Viavi Solutions

Jan 2016 - Apr 2021 (5 years 3 months)

Modernized legacy systems by developing backend services in C# (.NET Framework) and Java (Spring Boot), improving scalability and maintainability. Built RESTful APIs and enhanced frontend interactivity with Angular, JavaScript, AJAX, and jQuery, while optimizing relational schemas and queries in MySQL and refactoring legacy modules to reduce recurring bugs.

C#.NET Framework Java Spring Boot RESTful APIs Angular MySQL Query Optimization jQuery Data Modeling

Software Engineer

Diligent Software Systems Inc.

Aug 2016 - Nov 2016 (3 months)

Developed backend features with C# and ASP.NET MVC to improve internal application workflow structure and processing efficiency. Implemented validation and error handling, built reusable components to reduce duplicated logic, and optimized controller/service interactions to reduce response latency.

C#ASP.NET MVC Error Handling Performance Optimization backend architecture

Web Developer

IUPUI Multicultural Center

May 2015 - Dec 2015 (7 months)

Built responsive web pages using HTML, CSS, and JavaScript, addressing cross-browser compatibility and applying Bootstrap for consistent layouts across devices. Integrated interactivity with jQuery and connected frontend components to backend APIs to support dynamic data rendering.

HTML5 CSS3 JavaScript jQuery Bootstrap Responsive Design API Integration Browser compatibility