Roman Herrera
Senior Full‑Stack Engineer
About
Senior full-stack engineer with 10+ years of experience architecting scalable, data-driven platforms and transforming complex data into intuitive user experiences. Specialized in modern front-end development (TypeScript, React, Next.js) with equally strong back-end expertise (Node.js, Python, SQL/NoSQL databases). Deep experience building AI-powered applications (integrating LLMs via LangChain and similar frameworks) and scaling systems to national reach. Proven technical leader (former startup CTO) who mentors engineers, champions best practices in developer experience, and designs robust, maintainable architectures. Passionate about performance optimization, automation, and using code to solve complex challenges.
Core Skills
Professional Experience
- Architected the technical backbone of Deepblocks’ national-scale real-estate intelligence platform — a system that transforms raw municipal zoning, permit, and property datasets from 300+ U.S. cities into actionable, AI-ranked development insights. Designed an LLM-driven scoring engine using LangChain and vector embeddings to evaluate site potential in real time, seamlessly integrated into a React + TypeScript interface optimized for millisecond interactions.
- Pioneered a migration from MongoDB to PostgreSQL + PostGIS, enabling geospatial queries 10x faster and eliminating third-party GIS dependencies. Re-engineered map rendering pipelines, deploying a self-hosted TileServer-GL stack on AWS, cutting tile costs in half and improving time-to-first-paint by 20%.
- Introduced a continuous delivery pipeline with automated integration tests and linting gates that reduced regressions by 65% across 2000+ PRs. Drove a culture of reliability and code quality by mentoring engineers on test-driven development, observability, and system monitoring — maintaining a rollback rate below 2% in production.
- Delivered technical demos and architecture walkthroughs that helped leadership secure a multi-million-dollar seed round by showcasing the system’s scalability, data precision, and LLM-powered intelligence layer.
- Co-engineered Deepblocks Pro, a WebGL-accelerated 3D zoning and feasibility simulator built with React, TypeScript, and custom rendering shaders — allowing developers to manipulate urban massing models and zoning envelopes with real-time physics and constraint validation. Reduced traditional feasibility analysis cycles from days to seconds.
- Built a multi-tenant SaaS architecture from the ground up, integrating secure subscription tiers and user isolation at the API and database layers. This architecture drove 22% YoY ARR growth and cut customer churn by 30% by eliminating configuration debt and simplifying onboarding.
- Created ChatDB, an AI-assisted analytics layer powered by LangChain that translates natural language queries into SQL, dynamically generating charts, heatmaps, and leaderboards from live datasets. The feature increased engagement by 40% and established Deepblocks as an early adopter of AI-augmented interfaces.
- Integrated instant pro forma modeling into Deepblocks Pro using Python backends and reactive data hooks, enabling developers to perform side-by-side financial simulations on live 3D sites — influencing over $500M in development investment decisions.
- Developed a React dashboard that optimised import/export routes, cutting freight spend by 15 % for beta customers; the technology sold for six‑figure acquisition within 8 months.
Certifications
XFM110 - Technical Fundamentals of Generative AI
Stanford - Feb 2025
Credential ID 0x7332eA1229c11C627C10eB24c1A6F77BceD1D5c1
Education
JAE Higher Polytechnic Institute
Recent Projects
AIM Engine
A platform to deliver off-market leads for commercial and residential real estate.
Deepblocks Pro
A platform that provides a comprehensive market overview for real estate development planning across 200+ cities.
ChatDB
A chat interface that provides on-demand graphs, ranking tables, and maps using historical data for market selection decisions.
Cryptongo
An engaging educational game designed to teach you about cryptocurrencies and blockchain technology.