Nicolas Chataing

Work Experience

• Sep 2025 — Present
  Engineering Manager Ledger, Paris

  Leading the Governance backend team in the platform rewrite (TypeScript monorepo):

  • Championed the full platform rewrite to executive committee;
  • Leading the backend team while staying hands-on: HSM development, frontend, load testing, Kubernetes, SSO integration.
• Jan 2024 — Aug 2025
  Staff Software Engineer / Tech Lead Ledger, Paris

  • Led the Retail Wallet project (initiated Sep 2023, before formal role change): designed reusable policy-based account management; rewrote the HSM governance engine, cutting transaction request creation time from 10s to 1s.
  • Led the firefighting team for the Ledger Enterprise BU (Jul 2024 — early 2025): coordinated production incident response and cross-team escalations;
  • Joined the Governance team rewriting the backend platform from Python to TypeScript; shipped the refactored onboarding ceremony app (Nov 2024);
  • Integrated new blockchain support on the platform (Sui, Hedera, Canton); contributed to the Ledger Tradelink product.
• Apr 2022 — Dec 2023
  Firmware Application Engineer, then Senior Ledger, Paris

  Developed secure enclave (HSM) applications in C with a Python test suite:

  • Built the Smart Contract Interaction clear-signing feature using signed trusted descriptors; work contributed to the EIP-7730 standard;
  • Led EIP-191 & EIP-712 message signing integration across the full stack (C, Python, Scala);
  • Extensive codebase refactoring (Ethereum parser rewrite, modular object management) improving readability and security;
  • Led the Ledger Live / Ledger Vault bridge project end-to-end (HSM to backend to frontend), integrating Tron, Cosmos and Near chains.
• Sep 2021 — Mar 2022
  Software Engineer LexiFi, Paris

  Developed financial contract management software (desktop and web), implementing contract lifecycle management pages in a large OCaml codebase.

Education

• 2017 — 2021
  ENS Computer Science Graduate Degree ENS Ulm, Paris

  Admitted via national competitive exam. Including the Parisian Master of Research in Computer Science (MPRI).

• 2015 — 2017
  CPGE MP* Info Lycée Hoche, Versailles

Publications

• POPL 2024

  N. Chataing, S. Dolan, G. Scherer, J. Yallop. Unboxed Data Constructors: Or, How cpp Decides a Halting Problem. Proc. ACM Program. Lang. 8(POPL). doi:10.1145/3632893

• ICFP 2021

  D. Merigoux, N. Chataing, J. Protzenko. Catala: A Programming Language for the Law. Proc. ACM Program. Lang. 5(ICFP). doi:10.1145/3473582

Technical skills

Languages

TypeScript, Python, C, Rust, OCaml

Infrastructure

Kubernetes, Docker, CI/CD, Git, Linux

Domains

Secure enclaves (HSM), blockchain protocols (Ethereum, Tron, Sui), full-stack web development