Charlie Grussing-Neitzel
Senior full‑stack JavaScript engineer with 15+ years of experience building and scaling cloud‑native, production systems. Deep specialization in React, Node.js, TypeScript, and applied AI engineering, including LLM integration, prompt design, and AI‑driven data workflows. Proven track record delivering enterprise SaaS platforms, modernizing front‑end architectures, optimizing cloud costs, and leading high‑impact engineering initiatives. Known for translating ambiguous business needs into simple, reliable, and scalable solutions
REVIEWS FROM CLIENTS
Built a production‑ready AI chatbot using OpenAI GPT models with strict context‑scoping to prevent irrelevant or unsafe responses. - D...
Built a production‑ready AI chatbot using OpenAI GPT models with strict context‑scoping to prevent irrelevant or unsafe responses. - Designed and refined prompt strategies that materially improved answer relevance and user trust. - Developed an AI‑driven customer review summarization system using MySQL‑backed data pipelines, storing structured summaries for downstream product insights. - Created an open‑source LLM playground enabling rapid model swapping and evaluation using Hugging Face models via Ollama.
Led a device‑core engineering team delivering highly available connectivity and platform services (99%+ availability). - Owned roadmap...
Led a device‑core engineering team delivering highly available connectivity and platform services (99%+ availability). - Owned roadmap execution, prioritization, and capacity planning to align engineering outcomes with business goals. - Hired, coached, and developed engineers while fostering psychological safety and high technical standards. - Partnered cross‑functionally with Product, UX, and Platform teams to translate customer needs into executable technical plans. - Improved CI/CD workflows, observability, and fault‑tolerant service patterns across microservices.
ParkChirp is an enterprise software platform that is transforming an antiquated, analog parking industry. As a Principal Software Engi...
ParkChirp is an enterprise software platform that is transforming an antiquated, analog parking industry. As a Principal Software Engineer, I provided expertise and guidance on software development best practices, led the development team, set up Jira project from scratch, integrated tooling for efficiency, built development teams, implemented and contributed to automated testing, and was a full stack contributor to all code bases.