Philip Mollerus
Full-Stack Software Engineer
Curious full‑stack engineer specialized in building maintainable and scalable UIs, services and data systems.
Experience
Software Engineer · CoStar Group
Dec 2025 – Present
Arlington, VA
- Build and maintain Web Enterprise — the full-stack platform underpinning Homes.com, Apartments.com, LoopNet, and other CoStar digital marketplaces.
- Develop across 40+ microfrontends: React (SSR) clients, Node.js BFF layers, and .NET backend services and proxies.
- Deploy services to hybrid on-prem and AWS Kubernetes environments; leverage cloud-hosted Elasticsearch for high-performance search and data retrieval.
- Author SQL Server database migrations and stored procedures supporting contract management data integrity across 40+ services.
Software Engineer · Deloitte — NIH Contractor
Jul 2023 – Nov 2025
Arlington, VA
- Designed and deployed enterprise-scale Generative AI and NLP systems for the National Institutes of Health, serving 20,000+ employees.
- Built a custom Model Context Protocol (MCP) server and toolchain enabling natural-language queries against NIH data warehouses.
- Integrated OpenAI and private LLMs to power RAG-based applications across secure Azure and AWS FedRAMP environments.
- Automated CI/CD pipelines with Azure DevOps, cutting deployment time from hours to minutes; boosted ML pipeline throughput ~40% through parallelization.
- Partnered directly with NIH stakeholders on technical strategy, system architecture, and secure AI deployment.
Associate Data Engineer & IT Architecture Intern · The Hanover Insurance Group
May 2022 – Apr 2023
Worcester, MA (hybrid)
- Developed Spring Boot microservices for enterprise document automation and optimized SQL stored procedures for high-volume data operations.
- Migrated legacy Access systems to SQL Server, improving reliability and scalability.
Software Development Intern · Columbia University Zuckerman Institute
May 2021 – Aug 2021
New York, NY
- Built MATLAB tools integrating EyeLink 1000 Plus hardware for neuroscience research and automated experimental data pipelines.
Projects
Full-stack portfolio app featuring an AI chat widget backed by RAG and pgvector semantic search. ASP.NET Core 9 API with OAuth2/OIDC auth and Docker containerization.
C# / ASP.NET Core React TypeScript PostgreSQL + pgvector OpenAI Auth0 Docker Digital Ocean VPS
Real-time web chat app with concurrent WebSocket broadcasting via a Go backend and PostgreSQL message persistence. Deployed to AWS Lightsail behind Nginx with an automated GitHub Actions CI/CD pipeline.
Go React TypeScript PostgreSQL WebSockets AWS VPS Nginx GitHub Actions
Skills & Interests
Languages
TypeScriptPythonC# / .NETJava / Spring BootGoSQL
Backend & Data
REST APIs & WebSocketsPostgreSQLSQL ServerRedisElasticsearchORMsStored ProceduresData Modeling
AI / ML
LLMsRetrieval-Augmented Generation (RAG)Vector DatabasesModel Context Protocol (MCP)Agent SDKsPrompt & Context EngineeringNLP (NER · Sentiment Analysis · Keyword Extraction)
Frontend
ReactNode.jsExpressTailwind CSS
Infrastructure
AWSAzureDockerKubernetesCI/CDLinuxOn-Prem
Education & Certifications
B.S. Computer Science · Dickinson College
May 2023 Oct 2025
Contact
Open to opportunities, collaborations, and interesting conversations.
pmollerus23@gmail.com