Jeffrey Kim

I am a Senior Full-Stack Software Engineer with extensive experience building scalable, high-quality software products across web, cloud, and cross-platform environments. I have worked across multiple industries including consumer web, gaming, Web3, AI, healthcare-adjacent systems, logistics, and enterprise SaaS, contributing to products used by millions of users.
My core expertise spans frontend, backend, cloud infrastructure, and system integration, allowing me to take ownership of projects from concept to production.

What I do
Design and develop modern web applications using React, Next.js, Angular, and TypeScript
Build and maintain backend services and APIs using Node.js, Python, Java, and C#/.NET
Implement REST, GraphQL, WebSocket, and real-time systems
Develop serverless and microservices architectures
Design and optimize databases and data pipelines (PostgreSQL, MySQL, MongoDB, DynamoDB, BigQuery)
Build and deploy applications on AWS and GCP
Set up CI/CD pipelines, containerized environments, and cloud infrastructure
Integrate third-party services such as payments, analytics, e-commerce, messaging, and advertising APIs
Implement testing strategies including unit, integration, and end-to-end testing
Optimize applications for performance, scalability, accessibility, and maintainability

Technical expertise
Frontend: React, Next.js, Angular, Tailwind CSS, Material UI, Chakra UI, Webpack, Vite, WCAG 2.1
Backend: Node.js, Python, Java, C#/.NET, REST & GraphQL APIs, WebSockets, gRPC
Cloud & DevOps: AWS, GCP, Docker, Kubernetes, Terraform, CI/CD
Data & Analytics: BigQuery, Spark, Airflow, ETL pipelines
Advanced integrations: Web3 & blockchain, generative AI, real-time systems

How I work
I’m comfortable working independently or as part of a team, and I have experience collaborating with product managers, designers, and stakeholders in Agile environments. I focus on writing clean, maintainable code, following best practices such as TDD, code reviews, and iterative delivery.
I support clients throughout the entire lifecycle of a project—from requirements gathering and system design to development, deployment, and ongoing improvements—with clear communication and a strong focus on delivering real business value.
If you’re looking for a reliable, experienced engineer who can handle complex technical challenges and deliver production-ready solutions, I’m happy to help.