Charlie Grussing-Neitzel

Rising Codementor

US$8.00

For every 15 mins

ABOUT ME

Full Stack Developer and Mentor. Building exceptional software

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

English

Central Time (US & Canada) (-05:00)

Joined November 2023

EXPERTISE

10 years experience

10 years experience

3 years experience

7 years experience

10 years experience

7 years experience

17 years experience

REVIEWS FROM CLIENTS

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SOCIAL PRESENCE

GitHub

StartingGate-Public

JavaScript

nextrip-case-study

JavaScript

EMPLOYMENTS

Senior AWS Full Stack Engineer

Federal Reserve Bank of Minneapolis

2026-03-01-Present

• Drive hands-on, end-to-end feature development for a critical cloud migration project, rebuilding a legacy application into a high-perf...

• Drive hands-on, end-to-end feature development for a critical cloud migration project, rebuilding a legacy application into a high-performance, cloud-native architecture on AWS. • Own full-stack feature delivery, utilizing expertise in TypeScript and Node.js on the backend and leveraging Next.js and React for modern, responsive frontend development. • Spearhead frontend contributions, focusing on high-visibility features, UI/UX implementation, and ensuring a world-class user experience. • Design and implement scalable data solutions and service integrations, primarily leveraging PostgreSQL for robust data persistence. • Ensure application stability and quality by implementing and adapting automated testing frameworks, including Jest, as part of a continuous delivery pipeline. • Contribute to the deployment and operational success of the cloud-native solution, leveraging familiarity with core AWS services and foundational DevOps concepts.

Node.js

Git

PostgreSQL

Node.js

Git

PostgreSQL

TypeScript

React

Jest

AWS Lambda

Next.js

Prisma

AWS

Full Stack AI Engineering

Independent / Freelancing

2025-09-01-Present

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.

Node.js

MySQL

React

Node.js

MySQL

React

Prisma

OpenAI

Tailwind css

Vite

AI model fine-tuning

Tanstack

Ollama

Engineering Manager

SmartThings

2024-03-01-2025-07-01

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.

Git

Monitoring

Jira

Git

Monitoring

Jira

Microservices

CI/CD

Observability

AWS

PROJECTS

StartingGate

2018

- Designed and developed local Ski Resort ski school private lesson scheduling application with real-time airport-like lesson schedule di...

- Designed and developed local Ski Resort ski school private lesson scheduling application with real-time airport-like lesson schedule displays around the ski school, scheduling conflict protection, lesson time slot limiting, recurring lesson tracking, etc. - UI/UX – Wireframes, High-fidelity mocks, UX workflows, etc. - Front End – Handlebars (dynamic HTML templating), LESS (CSS styling) - Backend – Meteor.js full stack API framework, User authentication, Node.js - Database – Designing and implement No-SQL database (MongoDB)

MongoDB

Meteor

CSS3

MongoDB

Meteor

CSS3

LESS

Handlebars.js

JavaScript