Péter Újvári

 
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Ethereum / Solidity architect (10y) · $100M+ value secured · Agentic tooling

Péter Újvári
Copenhagen, Denmark / remote
+45 52 80 67 00
peter.ujvari92@gmail.com
github.com/1up8192 | linkedin.com/peter-ujvari92

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Summary

Ethereum smart contract architect/engineer with 10 years in the Ethereum ecosystem and 12 years of professional software experience overall. I build production-grade DeFi systems end-to-end: translating product ideas into smart contract architectures, implementing them safely, and hardening them through testing, audit response, and incident response.

Built and maintained production contracts securing $100M+ in value
Strong experience in incident response, hardening, and safety-by-design
Testing-heavy: mainnet-fork testing, invariants, fuzz/property-based testing
Experience with ethers.js, Hardhat, Foundry, Tenderly
Early adopter of agentic coding tools to accelerate planning, testing, hardening
Strong practical foundations in cryptography and threat modeling
Computer science and engineering background
Linux and CLI-native

Interested in: Permissionless systems, decentralization, privacy tech, ZK, and applications where on-chain primitives unlock genuinely novel value.

Open to: Senior/Lead roles in Solidity, protocol engineering, or smart contract security — Copenhagen (hybrid) or remote.

Experience

NFTfi — Senior Smart Contract Developer

Jul 2021 – Present | Remote

Core architect and primary builder of NFTfi's smart contract system for NFT-backed P2P loans, from design to production releases
Maintained and upgraded contracts securely escrowing high-value NFT collateral, including tokenized / RWA-style assets
Designed deployment and migration flows for frequent upgrades while minimizing user disruption
Improved gas efficiency and reduced required user interactions
Built hardening workflows: mainnet-fork tests, invariants, fuzz/property-based testing, audit response, incident response
Collaborated closely with product, frontend/backend teams, and external auditors
Shared knowledge internally on Ethereum, cryptography, and smart contract architecture
Delivered advanced protocol features including flashloan-based refinancing, Merkle-tree and oracle-backed token distribution, BoringVault-style vault integrations
Designed and implemented competitive migration mechanisms to attract users from competing protocols

Unslashed Finance — Smart Contract Architect / Developer

May 2020 – Jun 2021 | Remote

Employee #2 at an early-stage DeFi insurance startup
Contributed a substantial part of the smart contract architecture and implementation
Helped build a production protocol that reached $160M+ TVL at peak

MakerDAO — Software Developer

Aug 2018 – Dec 2018 | Copenhagen

Developed internal tools and created user-facing guides and tutorials

Earlier Experience

Galaxis Network / Solidity Services — Founder & Smart Contract Architect / Consultant | Mar 2018 – Dec 2019 | Budapest / Remote

Founded and built a DeFi portfolio management project (Galaxis Network); in parallel consulted on blockchain projects — designing smart contract architectures, delivering development work and training (Solidity Services).

EPAM Systems — Software Engineer | May 2016 – Mar 2018 | Budapest

Blockchain Competency Center: research, proof-of-concepts, and internal training.

Rubin Informatikai Zrt. — Junior Software Developer | Oct 2014 – Apr 2016 | Budapest

Backend features for a telecommunications service in Java/Spring with Oracle DB.

Education

DTU – Technical University of Denmark

Master's programme, Space Engineering and Mathematical Modeling | 2020 – 2022

Budapest University of Technology and Economics

BSc, Computer Engineering | 2011 – 2016

Skills

core: Ethereum · Solidity · Smart Contract Design · Software Architecture · Smart Contract Testing · Agentic Coding · Cryptography Fundamentals
tooling: Hardhat · Foundry · ethers.js · Tenderly · JavaScript · Python · Linux · Git
earlier: Java · C# · C · C++ · SQL · Erlang · Prolog

Languages

English — Professional working
Hungarian — Native / bilingual
Danish — Intermediate

peter.ujvari92@gmail.com · Copenhagen, Denmark