Looking for a job

Feifei Sun

@feifeisun

Message

I build fast, reliable full-stack platforms, automation tools, and event-driven cloud services.

United States

Message

What I'm looking for

I’m looking to own ambiguous full-stack and backend problems in fast-moving, AI-adjacent environments, building reliable cloud platforms, automation, and event-driven services from design through production.

At Chatham Financial, I build full-stack systems for trade valuation and market data platforms used by financial professionals. I’ve delivered backend services, React interfaces, REST APIs, and event-driven workflows that reduce operational overhead and improve performance.

I designed a C#/.NET Market Data Architecture on Azure that reduced processing time from 8 seconds to 0.2 seconds. I also manage reproducible Azure infrastructure with Terraform and build observability through Grafana, Prometheus, and OpenTelemetry.

I’ve shipped internal automation tools in Java Spring Boot and React, replacing legacy workflows and improving operational efficiency by 80%. I also improved CI/CD testing for Dockerized parallel execution, reducing build time by 60%.

Outside of work, I’ve built and deployed full-stack web applications with Next.js, TypeScript, Express, PostgreSQL, MongoDB, and serverless services. I enjoy owning ambiguous problems and building reliable products from frontend workflows through production infrastructure.

Experience

Work history, roles, and key accomplishments

Current

Software Developer II

Current

Chatham Financial

Feb 2026 - Present (8 months)

Designed and delivered a Market Data Architecture in C# / .NET on Azure, cutting processing time from 8s to 0.2s. Managed Azure infrastructure as code with Terraform and built production observability with Grafana, Prometheus, and OpenTelemetry.

C#.NET Azure Event Hub Stream Analytics Azure Cosmos DB Terraform Grafana Prometheus OpenTelemetry Distributed Systems Code Review Mentorship

Software Developer I

Chatham Financial

Jan 2025 - Jan 2026 (1 year)

Enhanced a trade valuation platform serving 300K+ daily valuations, delivering scalable backend services and React interfaces. Built custom software integrations and owned production support, reducing latency by 40%.

React REST APIs Event Driven Architecture Caching Root Cause Analysis Production Support Integration Performance Optimization

Software Developer Intern

Chatham Financial

Jun 2024 - Aug 2024 (2 months)

Built and shipped a full-stack internal automation tool in Java Spring Boot and React, improving operational efficiency by 80%. Integrated automated tests into CI/CD pipelines, reducing build time by 60%.

Java Spring Boot React CI CD Docker Testing Automation Fullstack Development