CV

Julien Béranger

+ Claude Opus 5

Smart Contract & Full-Stack Engineer — AI / LLM integrations

Montpellier, France · julien@strat.cc · +33 6 30 90 54 48 julienberanger.com · GitHub · LinkedIn · X · Farcaster · Telegram · Element

Senior full-stack developer with 6+ years in production — TypeScript, React/Next.js, Node.js, REST APIs, CI/CD, and LLM integrations. I build complex business interfaces, data pipelines, and AI features — and I teach people how to do the same. Working languages: English, French, Chinese.

Core Skills

Languages & Frameworks

Solidity, Node.js, TypeScript, React, Next.js, Nest.js

AI & LLM

Agentic RAG systems, multi-model orchestration (Claude, ChatGPT, Mistral), LLM fine-tuning, Anthropic API integrations, Claude Code and LLM dev tooling (Zhankai), prompt and context engineering for production business workflows

Web3

Hardhat, Foundry, Ethers, Viem, Wagmi, Reown, OpenZeppelin

Zero-Knowledge

Privacy-preserving Web3 design, proof verification workflows, Rate-Limit Nullifiers (ZK API)

Developer Relations & Training

Technical docs, app examples, tutorials, live coding, workshops, hackathon mentoring, cohort facilitation in English

Engineering Practices

Git, CI/CD, Jest, DevOps, Docker

Career Summary

CEO & Lead Developer — Strat

2020 – Present · Montpellier, France

  • Built an AI quoting assistant for Batappli (Systemlog, 5k+ MAU): tradespeople describe a job in a few words and get a ready-to-send quote in seconds. Shipping to production.
  • Built a report-drafting tool for a partner running nursing-home compliance inspections — turning hours of manual writing into a guided, structured workflow.
  • Delivered a custom RAG system for Systemlog.
  • Built an NFT registry for AFNIC, the institution managing 4 million .fr domains.
  • Developed multiple Web3 projects for Kleros and Hexarchia.
  • Organised Web3 hackathons for UNESCO and Université Paris 8.
  • Trained students at Epitech Digital School, STUDI, and emlyon business school.
  • Won 1st Prize at the DAO Global Hackathon 2022 (Core DAO tech track).

Co-founder & Lead Developer — W3HC (Web3 Hackers Collective)

Feb 2023 – Present

Developer Relations Engineer — Arthera

Jul 2023 – Dec 2023

  • Wrote the technical documentation, guides, tutorials, and app examples.
  • Led technical support online and during hackathons.
  • Supported partners in integrating the product.
  • Organised a 150+ attendee event during EthCC 2023 in Paris.
  • Improved the core product: load testing, upgradeable system contracts.

Developer Relations Engineer — Aurora Labs

Sep 2022 – Dec 2022

  • Wrote the technical documentation, guides, tutorials, and app examples.
  • Led technical support online and during hackathons.

CEO & CTO — Āto

2020 – 2022

Head of Communications — iExec

2016 – 2019

  • Led the ICO, raising 10,000 BTC in under 3 hours.
  • Grew the Twitter account from 0 to 30k followers in a few months.
  • Organised 200+ attendee events during Devcon Prague.

Customer Support Manager — OpenClassrooms

2014 – 2016

  • Built the customer service function from the ground up, handling over 1,000 requests weekly.

Chinese Teacher — French National Education

2008 – 2013

  • Taught students from CEFR level A1 to B2.

Teaching & Enablement

  • Cohort training: Epitech Digital School, STUDI, emlyon business school — technical and non-technical audiences.
  • Workshops & hackathons: organised and mentored events for UNESCO, Université Paris 8, and EthCC 2023 (150+ attendees).
  • Developer relations: documentation, tutorials, app examples, live coding, and online support at Arthera and Aurora Labs.
  • Classroom experience: five years teaching Chinese in the French national education system.
  • Delivery languages: English (bilingual), French (native), Chinese.

Selected Projects

Rukh — agentic RAG API

Modular AI framework with a RAG system supporting multiple LLMs and personalised contexts. Pick your model per session, keep context across sessions. Live API · Assistant demo

Zhankai — LLM dev tooling

CLI that converts a repository into a structured markdown file for LLM processing. npm · Demo video

w3pk — passwordless Web3 auth SDK

WebAuthn-based self-custodial wallets, no seed phrases, with stealth addresses and ZK primitives. Site · Docs · npm · Next.js starter

ZK API — anonymous LLM access

Prepaid, ZK-proof-backed anonymous access to AI models using Rate-Limit Nullifiers.

Affix — on-chain document authentication

Anchor document hashes on-chain so anyone can verify a document is genuine and unaltered, without changing existing workflows. UI · Contracts · Demo video

Gov — on-chain governance

Voting and proposal tooling for real groups, not just DAOs. Cross-chain · Docs · Deployer

Shebam — regulated on-chain Euro payments

Payments settled in EURe via Safe — faster and cheaper than card rails, fully auditable. GitHub

Avventura — AI-driven Web3 RPG

Text-based RPG where choices, assets, and progress live on-chain, with LLM-powered storytelling. GitHub

Wulong — confidential API

Nest.js API running inside a TEE with ML-KEM-1024 encryption and SIWE authentication.

Awards & Recognition

Education

  • Degree in Chinese Studies (Philosophy, Literature and Arts) — INALCO, National Institute for Oriental Languages and Civilizations, Paris, 2007.

Languages

English (bilingual) · French (native) · Chinese

CV — Julien Beranger