Joshua Lazoff

Professional summary

Twenty years of production engineering for Goldman Sachs, the team behind MetaMask, and Chainlink. I build grounded AI: systems that back every answer with a citation you can look up - knowledge graphs, retrieval, and evaluation pipelines, running on hardware I own and measured by tests anyone can read and run.

Core skills

AI: knowledge graphs (Neo4j), grounded / cited generation, retrieval & embeddings, evaluation pipelines, local inference (Ollama, CUDA GPU cluster)
Engineering: Python, TypeScript, Next.js, Node, Postgres, Playwright, CI/CD, Cloudflare edge
Leadership: senior engineering management, mentoring programs, multi-team operations

Experience

Founder - Digital Twin ProFeb 2023 - present

Private AI appliances: buy once, own outright.

• Designed and run a self-hosted GPU cluster serving open models, knowledge graphs and speech - data never leaves the building.
• Built OpenRabbi: a speaking agent grounded in a Neo4j knowledge graph of a classical library, where every answer carries a verifiable citation.
• Wrote the evaluation discipline: every citation checked against its source text, in written tests and live conversation; methodology and queries published for anyone to re-run.
• Operate forty-nine production sites built, deployed and QA'd by pipelines I wrote (Playwright audits gate every deploy on live-page measurements).

Founder - LazoffTech (client engineering)Jun 2015 - present

• Independent engineering practice; both engagements below ran through it - alongside Project Mercava, a learning platform built with a team in Israel (2015 - 2017), and a ground-up digital-library rebuild (2016 - 2017).

ConsenSys - Web Engineering, Lead Software Engineering ManagerFeb 2018 - Feb 2024

• Rose to Lead Software Engineering Manager (Aug 2022 - Feb 2024), responsible for every website behind MetaMask and consensys.io - the web presence of software guarding millions of users' funds.
• Joined through the education arm, building the platform that taught developers smart-contract programming.

Software Engineering Contractor - Chainlink LabsMay 2021 - Oct 2024

• Built the sites and tools relied on by developers of the industry's oracle networks - systems whose product is verified facts; three years concurrent with the ConsenSys engagement.

Software Engineer - AmplifyMay 2015 - Oct 2015

• K-12 education technology on AWS - the bridge from the corporate world to my own practice.
• When the classroom market chose the iPad over Amplify's own tablet, that product world wound down. A marketing firm asked for website help; more clients followed, and the practice became LazoffTech.

Software Engineer - Goldman Sachs, SecuritiesMay 2013 - Jun 2015

• Trade-verification and regulatory-reporting systems; built a query service shared firm-wide as internal open source, in the firm's in-house language.
• Helped stand up a round-the-clock, multi-team operation catching errors before they reached production impact.
• Started as an intern on the same derivative-trade-processing team three summers running (2010, 2011, 2012); ran the mentoring program for incoming interns.

Education

Cornell University

B.S. Information Science, Systems & Technology (2008 - 2012) · M.Eng. Engineering Management, computer science concentration (2012 - 2013). Taught calculus; treasurer, Society of Hispanic Professional Engineers chapter.

Awards

The Lovie Awards 2023 - Bronze, Web3 Single: Commerce, Finance & Governance. For MetaMask Portfolio (Antinomy Studio with Consensys). Credited as Consensys - Lead Software Engineering Manager.

Communication Arts - Webpick feature on MetaMask Portfolio, credited among the software engineers.

Production properties shipped

Sites built, rebuilt, or run in production for employers and clients. Links verified live 18 Aug 2026.

ConsenSys ecosystem2018 - 2024

metamask.io · learn.metamask.io · consensys.io · ConsenSys Academy · ConsenSys Diligence (now diligence.security) · Innovation Lab · Infura · Truffle Suite · EthTrust · 2047 · Palm Network · NAV Hackathon · VillageDAO

Chainlink Labs2021 - 2024

chain.link - developer-facing web infrastructure for the industry's oracle networks.

Jewish education platforms2015 - 2018

Aleph Beta - redesign of the Torah video platform · Project Mercava - learning platform built with a team in Israel.

Own products2023 - present

digitaltwinpro.com · openrabbi.com · app.openrabbi.com · jew.tech - and 49 live sites in all.

Selected public work

jew.tech - the research: grounded AI, evidence, methodology, agenda · app.openrabbi.com - the speaking agent, live · digitaltwinpro.com - the product