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Xian Zheng

@xianzheng

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AI Engineer and full-stack founder building production LLM systems.

United States

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What I'm looking for

I’m looking to build production-grade AI systems—especially agent orchestration + RAG—inside teams that value accessibility, reliability, and fast iteration, with room to own end-to-end delivery from architecture to production monitoring.

I’m an AI Engineer and full-stack software engineer with 7+ years shipping production web and mobile systems across edtech, fintech, and govtech. My recent work centers on production LLM applications—agent orchestration, Retrieval-Augmented Generation (RAG), and Model Context Protocol (MCP) servers.

I’ve delivered AI at scale, including accessibility-focused modernization for Massachusetts Paid Family and Medical Leave (PFML) under WCAG 2.1 AA, and transaction systems handling 1.5M+ daily events. I build hallucination-prevention pipelines that move from constraint → verification → human review, so AI tools stay reliable when deployed against production data.

I also thrive at the intersection of product and engineering: as Co-Founder & Head of Engineering at Ensō Collective, I led launch of a social web app that grew to 24,000 waitlist signups in two months. From there, I continue to push fast execution with production-grade quality—winning 10 consecutive hackathons and delivering showcase-ready work like Ember, a structured-literacy tablet app for students with dyslexia.

Experience

Work history, roles, and key accomplishments

AI Engineer Fellow

Gauntlet AI

Feb 2026 - Apr 2026 (2 months)

Built production LLM systems using RAG, LangGraph/LangSmith agent orchestration, and MCP servers, including hallucination-prevention pipelines (constraint, verification, human review). Shipped an offline-first structured-literacy tablet app (Ember) with multi-layer architecture and on-device speech recognition, reaching 1,200+ unique visits in 2 weeks.

Retrieval Augmented Generation (RAG)LangGraph Langsmith Model Context Protocol (MCP)Vue.Js Offline First MeSpeak.Js Vosk Browser Speech Recognition TypeScript Python

Software Engineer

Nava PBC

Nov 2024 - Mar 2026 (1 year 4 months)

Shipped React and Python features on the Massachusetts PFML public-benefits platform while meeting WCAG 2.1 AA accessibility requirements and federal procurement constraints. Modeled and optimized PostgreSQL schemas for high-availability government workloads.

React Python WCAG 2.1 AA PostgreSQL Data Modeling High Availability Government Benefits Eligibility Workflows

Co-Founder & Head of Eng

Ensō Collective

Dec 2022 - Jul 2023 (7 months)

Led development and launch of a social web application (React, Supabase, Mixpanel), driving 24,000 waitlist signups in two months. Built and deployed a companion mobile app (React Native, Express.js) and implemented analytics/A-B testing that improved onboarding completion by 35%.

React Supabase Mixpanel A B Testing React Native Product Experimentation

Software Engineer

Prove

Mar 2020 - Apr 2022 (2 years 1 month)

Architected and shipped Java APIs and third-party integrations for transaction systems processing up to 1.5M daily events, fixing critical reliability issues at scale. Mentored 3 incoming engineers and authored onboarding documentation that reduced ramp-up time by 50%.

Third Party Integrations Transaction Processing Reliability Engineering Mentorship Onboarding

Software Developer

Nexgen Technologies

Jul 2018 - Mar 2020 (1 year 8 months)

Built government applications with Angular, Java, and Oracle SQL serving 10,000+ daily active users. Optimized MyBatis queries to reduce load times by 30%.

Angular Java Oracle SQL MyBatis Query Optimization Performance Tuning

Education

Degrees, certifications, and relevant coursework

Gauntlet AI Fellowship

Fellowship, AI Engineering

2026 -

Selected for an AI engineering fellowship focusing on building production full-stack AI systems. Work included LLM application development with RAG, agent orchestration, and MCP servers.