Open to opportunities

AAS User

@gregorycharleslitzenberg

Message

I build production AI products end to end, from interfaces to transformer training.

United States

Message

What I'm looking for

I'm looking for an AI-native product team where I can own the full loop from schema and UI through LLM integration and cost instrumentation. Florida-based or remote-first roles that support relocating to St. Petersburg are my top preference.

I built Echoes of History from zero to a live conversational AI platform in six weeks, delivering a ~15,500-line TypeScript monorepo with React, Express, PostgreSQL, Redis, WebSockets, and Claude API integration.

I designed its long-term conversation memory and LLM cost-governance layer, including per-user spend ceilings, metering middleware, alerting, and an admin cost dashboard. I also shipped JWT authentication, RBAC, rate limiting, Railway CI/CD, and per-PR preview environments as the founder and sole engineer.

Alongside product work, I implemented a GPT-style decoder-only transformer from scratch in PyTorch, including a custom 16K-vocabulary BPE tokenizer, training loop, and an 8.5M-token policy-compliant corpus pipeline. Training reduced validation loss from 9.7 to 4.0.

I also built CreatorVault, a Next.js marketplace MVP with KYC states, JWT auth, Prisma, and a Stripe-ready payment abstraction, while helping build and maintain CommUnitopia's website as a founding board member.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Echoes of History

Jan 2026 - Present (7 months)

Built conversational AI platform from zero to production in six weeks, with ~15,500 LOC and 121 commits. Designed PostgreSQL schema with Redis caching, real-time messaging, Discord bot integration, and Claude API integration with cost governance.

TypeScript React Express PostgreSQL Redis WebSockets Claude JWT Railway CI CD

Current

Founder

Current

CreatorVault

Jan 2026 - Present (7 months)

Built a marketplace for escrow-contracted creative work using Next.js 16, React 19, Prisma 7, and Tailwind 4. Implemented buyer/creator roles, KYC verification, Zod validation, JWT auth, and a Stripe-ready payment abstraction.

Next.js React Prisma Tailwind TypeScript JWT Stripe KYC Zod

Current

Board Secretary & Co-founder

Current

Human Unity Project (CommUnitopia Inc.)

Jan 2023 - Present (3 years 7 months)

Founding board member of a community nonprofit, contributing to governance design, board records, fundraising, and member onboarding. Also builds and maintains the organization's website.

Nonprofit Governance Web Development

AI Research

Independent Research

Jan 2025 - Dec 2025 (11 months)

Implemented a decoder-only transformer from scratch in PyTorch, including RoPE, RMSNorm, SwiGLU, and weight-tied embeddings. Trained a custom BPE tokenizer and built a resumable scraping pipeline to assemble an 8.5M-token corpus, reducing validation loss from 9.7 to 4.0.

PyTorch Transformers Python Web Scraping Cosine LR Gradient Clipping