I build Solana infrastructure that keeps private keys off the internet: an air-gapped signing tool called Coldstar, and a Chrome extension called RugGuard that flags scam tokens before you trade them. Founding engineer, cyber security background, several hackathon wins along the way.

Solana / EVM Rust · Python · TypeScript Security & SecOps Product & UI Design London, UK
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01 / About

I founded ChainLabs in 2021 and have been building Solana security tooling under it ever since, starting with RugGuard, a Chrome extension that checks tokens for rug-pull risk before you trade them, and a small forensic toolkit for tracing transactions after the fact.

More recently I've been the founding engineer on Coldstar, which turns a regular USB drive into a wallet that never touches the internet. Transactions get built and signed offline. The private key only ever exists in locked memory for as long as signing takes, then it's wiped. No secure element, no proprietary hardware. Just a drive you could throw away afterward and lose nothing. Most of what I work on comes back to the same question: what happens if someone tries to attack this?

Outside of that, I tutor GCSE Computer Science students and help non-technical founders get their first version of something out the door without shooting themselves in the foot on security.

Based
London, UK
Focus
~3 years in Solana development
Education
BSc Computer Science, Cyber Security & AI, St Mary's University
Foundation Degree, Aerospace Engineering, Kingston University
Recognition
Solana Foundation grant recipient · Superteam member
02 / Success Stats
0
Wallets managed via Coldstar
$0
Total volume processed
0
GitHub stars on RugGuard
0
Hackathon wins
03 / Experience

A rough timeline of what I've built since 2021.

Jan 2026 - Present
Founding Engineer, Coldstar
ChainLabs Technologies Europe
Responsible for designing and building Coldstar's core security and execution infrastructure on Solana. An open-source tool that turns a USB drive into a disposable wallet: sign offline, broadcast from a separate device.
  • Built the key lifecycle in Rust: Argon2id for key derivation, keys locked in memory (mlock) and zeroed out right after signing.
  • CLI handles the whole flow: build the transaction, verify it, sign it offline, then hand it to a separate online device to actually broadcast.
  • 12,000+ wallets now run through it, $800K+ in volume processed via the SDK. It's on the Solana Seeker store: 4.1 stars, 500+ downloads.
  • Won the EasyA Pitchathon, picked up a Solana Foundation grant, and ran workshops on it in four countries.
Feb 2021 - Present
Technical Project Manager, RugGuard.xyz
ChainLabs Technologies Europe
Founded ChainLabs, a Web3-focused development collective, and led RugGuard from there: a Chrome extension that flags risky Solana tokens in real time using a RugCheck integration under the hood. Works on DexScreener, Raydium, and most other DEXes without needing the site itself to integrate anything. One of five hackathon wins so far.
2024 - 2025
Computer Science Tutor & Mentor
Freelance / Superteam IE
Taught GCSE Computer Science: algorithms, programming, how computers actually store data. Also spent time helping non-technical founders get their products shipped and reasonably secure.
Sep 2023 - May 2025
Contributor, University Rocket Society
Kingston University
Worked on landing and recovery systems for the university's rockets, mostly the aerodynamics and materials side, under real engineering constraints rather than a spreadsheet.
04 / Projects

From github.com/devsyrem

05 / Design

UI work for Coldstar & RugGuard.

Coldstar app running on a Solana Seeker phone, showing portfolio balance and send/receive/swap actions
Coldstar (mobile app)
Portfolio view on the Solana Seeker, paired with a Seed Vault for offline signing. Send, receive, swap, and bundle actions built around the same air-gapped signing flow as the desktop CLI.
RugGuard Chrome extension UI showing a token risk check result for Bonk, marked Safe
RugGuard (extension UI)
Token checker, watchlist, and recently-checked history in one panel. Paste an address, get a risk score and a safety verdict, add it to a watchlist if it's worth tracking.
06 / Skills

What I actually use.

Languages
Python Rust TypeScript JavaScript Solidity
Security & Forensics
Cryptography Digital Forensics Incident Response Anti-Fraud Systems Key Lifecycle Security
Systems & Blockchain
Solana EVM On-chain Analysis CLI Tooling Air-gapped Architecture
07 / Contact
Send a message!.
Button not opening your mail app? Copy directly: devsyrem@gmail.com