Solidity & Web3 Developer (in progress) | Backend Engineer | Cryptography Enthusiast
Currently transitioning from traditional backend development (Ruby on Rails & Python) into the Web3 ecosystem — with a growing focus on smart contract development, protocol architecture and zero-knowledge systems.
{'>'} VIEW PROJECTSI’m Juan, online as kazdov. I build at the intersection of Solidity, backend and security. My background is Python, Ruby on Rails and AWS, and I’m now going all-in on the Ethereum ecosystem.
I care about contracts that are simple to reason about, explicit in their invariants and honest about what they guarantee. If a protocol can’t be understood by reading the code, I treat that as a bug.
Solidity • EVM basics • governance-style patterns
Python • Ruby on Rails • PostgreSQL • clean APIs
AWS (Lambda, RDS, S3, IAM) • Docker • Linux
Thinking in attack surfaces, invariants and safe patterns
Practicing on-chain decision logic: candidates as structs, mapping(address => bool) to prevent double-voting, and owner-controlled flows.
Simple bank-style contracts to train safe balance handling, clear state changes
and require-based validation.
Rewriting small contracts as I learn more about patterns, gas usage and how attackers might think. Goal: become a solid junior engineer with real intuition, not just copy-paste skills.
I’m looking for a junior Solidity / smart contract role where I can write and review real contracts, learn from experienced engineers and contribute to systems that actually move value on-chain.
Teams shipping on Ethereum (L1/L2) with real users.
Code reviews, tests and serious risk thinking.
People who teach, document and share context.
Projects that want to persist and be alive in 5+ years.
On-chain voting system using structs, mappings and owner-controlled lifecycle to train governance-style logic.
Minimal banking logic for balances, deposits and withdrawals, focused on safe state updates and predictable behavior.
A growing collection of small contracts and experiments as I deepen my understanding of Solidity, the EVM and good patterns.
If you’re building something on Ethereum and need someone junior who learns fast, writes clean code and cares about security, let’s talk.
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