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Ethereum / Solidity architect (10y) · Built $100M+ value secured systems ·
Experienced with agentic tooling
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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.
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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.
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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
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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
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Languages
English
— Professional working
Hungarian
— Native / bilingual
Danish
— Intermediate
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peter.ujvari92@gmail.com · Copenhagen, Denmark