Lead Backend Engineer - AWS .NET

Ichu Lin

Lead Backend Engineer

Los Angeles, CA 626-***-**** *********@*****.***

https://www.linkedin.com/in/ichu-lin-77242762/ https://github.com/linichu6 https://resume-ai-chat-bot.onrender.com/ Professional Summary

Senior Backend Engineer with 20 years of experience designing, developing, deploying, and maintaining enterprise and fintech applications. Cloud-focused engineer with 5+ years of AWS experience building secure, scalable C#/.NET APIs and microservices for web and mobile platforms serving more than 5 million active and 20 million registered customers. Experienced in technical leadership, serverless and containerized architectures, system integration, and production reliability. Expanding into AI application development through hands-on Python and OpenAI SDK projects, including an interactive résumé chatbot.

Technical Skills

● Modern Cloud Stack: .NET Core, RESTful APIs (C#, JSON), AWS, Microservices, GraphQL

● AWS Services: Lambda, ECS(Fargate), SNS/SQS/Kinesis/MSK (Kafka)/AWS Glue, DynamoDB(NoSQL), RDS(MySQL), S3

● Design & Deployment Tools: Swagger/Postman/Insomnia, CI/CD (GitHub Actions), Harness

● AI & Development Automation: GitHub Copilot, Anthropic Claude, automated prompt engineering, AI-driven code refactoring, and practices to improve code quality, unit tests, accelerate delivery, and enhance team productivity

● Develop AWS Bedrock and AI-agent orchestration to implement business workflows by calling existing services and APIs. This approach was useful for business processes where the rules and execution steps changed frequently

● API & System Integration: Third-party API integration, RESTful service integration, external partner APIs, OAuth 2.0, JSON, webhook integration, secure service-to-service communication

● Additional Stack: WCF Services (SOAP/XML), .NET 6, ASP.NET, MVC, Angular, Node.js, IIS Server Professional Experience

Lead Software Engineer Experian, Costa Mesa, CA Feb 2022 - Jun 2026 C#/.NET/Entity Framework/AWS/Docker/GitHub/Harness/Claude

● Served as technical lead and primary owner of a core service within Experian’s microservices platform, leading its architecture, development, integration testing, deployment, and production support.

● Designed and developed multi-tenant, high-performance, secure C#/.NET RESTful APIs and AWS Lambda-based serverless services to support millions of consumers across web/Angular and mobile platforms; leveraged Redis for caching and distributed locking to reduce database calls, improve API performance, and coordinate concurrent processing across service instances

● Developed AWS Lambda serverless jobs to automate data remediation, cleanup, and validation processes, correcting data quality issues and reducing manual operational effort while lowering infrastructure and processing costs

● Implemented Datadog observability, monitoring, alerting, and centralized logging across AWS-hosted services, including REST APIs, Lambda functions, and SNS/SQS messaging workflows, enabling real-time detection of error spikes, latency degradation, and system anomalies while accelerating root-cause analysis and improving platform reliability

1/2

● Partnered with a DevOps engineer to develop YAML-based CI/CD pipelines using GitHub Actions, AWS CodeBuild, ECR, and Harness, including STO running Trivy container-image vulnerability scanning

● Used GitHub Copilot and Claude to accelerate boilerplate implementation, SQL refactoring, and unit-test development, improving engineering productivity and sprint delivery

● Implemented AWS Bedrock and AI-agent orchestration for offer-matching workflows, coordinating existing web services. This allowed the underlying microservices to remain stable while the workflow logic and execution sequence could be updated more easily

● Worked with QA team on Cucumber API test cases and with different teams on integration testsSr. Application Developer Santander Bank USA - Auto Lending, Irvine, CA Jul 2019 - Jan 2022 C#/ASP.NET/Entity Framework/MVC/WinForms/Vue/.NET Core/SQL Server/Control-M/Azure/Service Bus/Queue Storage/harness

● Modernized legacy applications by migrating WCF services to Azure-hosted .NET Core REST APIs and transitioning backend databases to Azure, improving maintainability, scalability, and interoperability across loan servicing and collections/recovery workflows

● Designed a decoupled microservices architecture using C# and .NET Core, enabling reliable integration and secure data exchange among enterprise financial systems

● Modernized high-volume WinForms applications and optimized Microsoft SQL Server queries and stored procedures, reducing processing bottlenecks and improving application performance and user experience

● Worked with Azure DevOps deployment strategy for CI/CD pipeline from Azure Pipelines to ACR to Harness and deployed smoothly

Sr. Application Developer Wells Fargo Bank - Auto Loan, Irvine, CA Mar 2013 - Jul 2019 C#/ASP.NET/Angular/Node.js/WCF service/SQL Server/Redgate/Oracle/Dapper/Mainframe/Octopus

● Led the migration of banking services to a modern C#/.NET platform, coordinating offshore developers and a third-party dev team through development, integration testing, defect resolution, and production validation to ensure a secure and seamless transition.

Software Engineer Wilshire Associates - Portfolio Management, Santa Monica, CA May 2006 - Mar 2013 C++/MFC/C#/WinForms/COM/VB/JavaScript/DevExpress/Java/SQL Server/Jira

● Developed C++/MFC Windows Application/GUI

● Developed C# Windows Application front end and intermediate layer (SOA and SQL Server backend)

● Developed C# COM for MFC to use C# DLL.

● Created interface between C#(managed code) and C++(unmanaged code)

● Writing API samples in ASP.NET C#, VB, and VBA for clients

● Created tools to generate reports for portfolio holdings, performance, etc. Software Engineer Parrot Media Network, Burbank, CA Jun 2005 - May 2006 C#/ASP.NET/SQL Server

● Developed C# ASP.NET web application

● Translated business requirements into scalable SQL Server database designs, creating normalized schemas, entity relationships, primary and foreign keys, constraints, and indexes to ensure data integrity and efficient query performance

Education

● University of Southern California, Master of Science in Computer Science 2/2

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