# Mr. Sun **AI Solutions Architect | Tech Lead | AWS Cloud Specialist** ๐Ÿ“ง stoneskin@gmail.com | ๐Ÿ”— [linkedin.com/in/stoneskin](https://www.linkedin.com/in/stoneskin/) | ๐Ÿ’ป [github.com/stoneskin](https://github.com/stoneskin/) --- ## Professional Summary Seasoned Software Architect and Tech Leader with **20+ years** of experience in .NET web development, system architecture, and cloud solutions. Expertise in full-stack development, DevOps, and SaaS solutions. Proven track record in leading teams, driving innovation, and optimizing system performance. **Currently leading:** AWS Migration Initiative at iPipeline (Tiger Team) - migrating legacy on-prem applications to AWS with modern CI/CD pipelines. **Open source:** Creator of [open-memex](https://github.com/stoneskin/open-memex), a local-first memory layer for AI coding agents (MCP server + CLI, published on npm). --- ## Core Competencies - โœ… AI/ML Integration (LLM, NLP, RAG, AI Agent Systems) - โœ… Software Architecture & Cloud Solutions (AWS) - โœ… Full-Stack Development (C#, React, Node.js, Python) - โœ… DevOps & CI/CD Automation (AWS CodePipeline, Jenkins, Docker) - โœ… Team Leadership & Technical Mentorship - โœ… System Integration & Performance Optimization --- ## Technical Skills | Category | Skills | |----------|--------| | **Programming** | C#, JavaScript/TypeScript, Python, Java, SQL | | **Web** | ASP.NET Core, React.js, Redux, HTML5/CSS, REST APIs | | **Cloud** | AWS (Lambda, EC2, S3, DynamoDB, SAM, CloudFormation, Fargate) | | **Databases** | MS SQL Server, MongoDB, Redis, PostgreSQL, Oracle, MySQL | | **DevOps** | GitHub Actions, Jenkins, Docker, Terraform, CI/CD | | **Tools** | Git, Jira, Docker, Jenkins, Postman, VSCode | | **Auth** | SAML, OAuth, PingFederate, Ping Access, Ping Directory | | **AI/ML** | LLM, NLP, RAG, MCP, OpenAI, HuggingFace, MS Copilot Studio, Google Colab | | **Methodologies** | Agile, Scrum, TDD, CI/CD, SOLID, Design Patterns | --- ## Professional Experience ### iPipeline, Inc. (A Roper Technologies Company) โ€” PA **Expert Software Engineer (Tech Lead, Tiger Team), R&D** | *April 2013 โ€“ Present (12+ years)* *Title progression: Lead Developer โ†’ Solution Architect โ†’ Expert Software Engineer* - Lead a team of 6 developers and 2 QA engineers, managing and building **40+ applications** (legacy and new) - Architect and deploy multiple AWS serverless solutions, reducing operational costs - Design and implement blue-green deployment strategy, reducing downtime and release risks - iPipeline's Ping/OAuth identity expert โ€” go-to resource for PingFederate, PingAccess, PingDirectory, and enterprise SSO (SAML/OAuth) integrations across teams **๐Ÿš€ Key Projects:** | Project | Description | Tech Stack | Impact | |---------|-------------|------------|--------| | **Quote AI Agent** | NLP-powered prototype using LLMs and prompt engineering for Quote Web UI | OpenAI, LLM, Prompt Engineering | Prototype | | **Calc-Engine AWS Serverless** | Migrated quote engine to AWS SAM with GitHub Actions CI/CD | AWS SAM, Lambda, DynamoDB, GitHub Actions | **70% performance improvement** | | **iSolve Quoting Solution** | iPipeline's **first cloud-native application** | AWS (EC2, S3, Lambda, API Gateway, DynamoDB, SQS, CloudFormation) | Pioneering cloud adoption | | **Quote Client & Web API** | SPA with modern deployment | React.js, Redux, .NET Core, Docker | Blue-Green deployment | | **Next-Gen Quote Engine (CalcStorm)** | Node.js-based calculation engine | Node.js, React.js, MongoDB, JWT, Webpack | Modern architecture | | **Auth/PingFederate** | Enterprise SSO integration | SAML, OAuth, PingFederate | Secure authentication | | **Tiger Team - Ping Identity AWS Migration** (2025-2026) | Lift-and-shift PingAccess, PingFederate, PingDirectory, PingDelegatedAdmin from on-prem to a dedicated AWS account | CloudFormation, EC2/ASG, ECS Fargate, EFS, ECR, ALB/NLB, Route 53, SSM, KMS, EC2 Image Builder, GitHub Actions (OIDC) | In Progress | --- ### Comcast Corp (via Turnberry Solutions) โ€” PA **Senior .NET Lead Developer** | *Sep 2012 โ€“ Apr 2013* - Designed, developed, and maintained .NET (C#) web applications - Led CI/CD pipeline implementation, reducing deployment time **๐Ÿš€ Key Projects:** - **Cafรฉ:** Widget-based customer management GUI using .NET MVC3 & jQuery - **Auto Deployment Solution:** Windows Service & Web GUI for automated deployments --- ### Kemper Corporation โ€” PA **Senior Web Application Developer** | *May 2010 โ€“ Aug 2012* - Designed and maintained .NET web applications with mobile app & API integrations - Led source control & auto-build deployment revolution, improving development efficiency **๐Ÿš€ Key Projects:** - **New Policy Holder Service:** Built with ASP.NET 4 & MVC3, optimizing user experience - **UDILibrary (3-Tier Architecture):** Refactored using IoC & WCF, improving modularity --- ### Broadview Networks โ€” PA **Web Application Developer** | *Apr 2003 โ€“ May 2010 (7+ years)* - Independently designed and developed multiple internal web applications - Developed applications across MS SQL Server, Oracle, MySQL - Built J2EE/JSP-based solutions **๐Ÿš€ Key Projects:** - **Billing Management Web GUI:** Architected using ASP.NET 3.5 & MVC Frameworks - **Jeopardy Reporting & Management GUI:** ASP.NET 2.0, C#, JavaScript, nHibernate, SQL Server --- ## Current Focus (2025-2026) ### Tiger Team - Ping Identity AWS Migration **Objective:** Lift-and-shift iPipeline's on-prem Ping Identity stack (PingAccess, PingFederate, PingDirectory, PingDelegatedAdmin) into a dedicated AWS account (us-east-1, multi-AZ), with zero-downtime blue/green cut-over across Dev, QA, UAT, and Production. **Role:** Technical lead for migration architecture, infrastructure-as-code, and CI/CD โ€” owner of the migration guideline and cross-team coordination (IT/Ops, security, application teams) on network segmentation, secrets management, and cut-over rehearsals. **Key deliverables:** - Retired Jenkins + Octopus Deploy; built GitHub Actions pipelines with OIDC federation (no long-lived AWS keys) and environment-gated approvals (Dev / QA / UAT / Prod). Designed a three-workflow release architecture (infrastructure / Golden AMI image build / application) plus a one-click bootstrap orchestrator for fresh AWS accounts. - Designed blue/green topology with parallel primary/secondary slots and Route 53 DNS cut-over for zero-downtime migration. - Authored CloudFormation IaC for the full Ping stack: PingFederate (Admin/Runtime on EC2 + ASG), PingAccess (Admin EC2 + engines on ECS Fargate with self-built Docker images and per-account ECR fallback), PingDirectory, PingDelegator on Fargate โ€” plus networking and security (IAM, KMS cross-account grants, SSM). - Built a 500-concurrent-user load-test harness; delivered an on-prem vs AWS comparative baseline report and autoscaling policies for PingAccess/PingFederate runtime services. - Resolved customer-facing issues surfaced during migration, including a PingFederate path rewriter that fixed a NYL SAML session-timeout. --- ## Open Source & Community ### open-memex *2026 โ€“ Present* - Open-source project: a local-first memory layer for AI coding agents. - Markdown as source of truth with SQLite FTS5 search; MCP server + CLI + editor integrations; human-reviewed memory capture; team knowledge sharing through git PRs. - Published on npm with public development on GitHub. - ๐ŸŒ [Repository](https://github.com/stoneskin/open-memex) ### MLCCC Chinese Characters Recognition App *July 2023 โ€“ Present* - Developed and donated a web application to the Mainline Chinese Culture Center for community use - **Tech:** JavaScript, HTML (responsive), PHP, MySQL, Google Dictionary API, Hugging Face OpenAI API (LLM) - Open-sourced project and mentored multiple high school and college students - ๐ŸŒ [Repository](https://github.com/MlcccCodingClass/ChineseCharactersRecognitionApp) ### Minecraft-Python *2019-2020* - Created tutorials on learning Python through Minecraft, making programming engaging and interactive - Developed multiple Minecraft plugins using Python - Enhanced gameplay and customization for educational purposes - ๐ŸŒ [Repository](https://github.com/stoneskin/python-minecraft) ### Programming Classes (MLCCC) Teaching programming to K-12 students: | Class | Grade | Tech | Schedule | |-------|-------|------|----------| | Scratch | G2-5 | Scratch Animation & Game | Sunday 3-4PM | | Python | G6+ | Python syntax, algorithms, web | Ended July 2026 | | Java | G8+ | Java + AP CSA prep | Private/Online | --- ## Education & Certifications | Credential | Institution/Organization | Details | |------------|------------------------|---------| | ๐ŸŽ“ **MS Computer Science** | Villanova University, PA | GPA: 3.85/4.00 | | ๐Ÿ† **Software Engineering Certificate** | Villanova University | | | ๐Ÿ† **Sun Certified Programmer for Java 2** | Sun Microsystems | | | ๐Ÿ† **OCA Oracle 9i DBA Certification (SQL)** | Oracle | | --- ## Career History Summary ``` 2003 โ”€โ”€โ”€โ–บ 2010 โ”€โ”€โ”€โ–บ 2012 โ”€โ”€โ”€โ–บ 2013 โ”€โ”€โ”€โ–บ 2025 โ”‚ โ”‚ โ”‚ โ”‚ โ”‚ Broadview Kemper Comcast iPipeline Present 7ๅนด 2ๅนด 7ๆœˆ 12+ๅนด ``` --- ## Additional Links - ๐ŸŒ Personal Site: [stoneskin.github.io](https://stoneskin.github.io/) - ๐Ÿ’ป GitHub: [github.com/stoneskin](https://github.com/stoneskin/) - ๐Ÿ”— LinkedIn: [linkedin.com/in/stoneskin](https://www.linkedin.com/in/stoneskin/) --- *Updated: October 2026*