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Capabilities, November 2026

Easily within the top 1% of people we have worked with to date.

David Brumley, CEO of ForAllSecure and Professor of Computer Science at Carnegie Mellon University

Jurenka Software is a small engineering agency. We write smart contracts and the systems around them, take tokens from the first line of Solidity to the first trade, and audit protocols for a fee per vulnerability found.

Start a conversation or book 30 minutes

Three services

Development
The whole lifecycle, from the first sketch to the release. Contracts, backend and frontend, in Solidity, Rust and TypeScript or whatever the problem needs. Our experience in big tech means we prioritise maintainability and testability, so what we write keeps working years on. That includes the front end: the chart in the case study below is ours, built by hand in SVG from the swap log.
Audits, paid per finding
We review your protocol and you pay only for the vulnerabilities we find. You carry none of the cost of a clean report, and we are paid for exactly the value we add. Nobody wants to wake up on the rekt leaderboard.
Training
Tutoring sessions at a flat hourly rate for engineers moving into smart contract work. Anything from how a chain reaches consensus to the architecture of your next contract.

August 2024

A funded token launch

Our client raised $2M from a major publicly traded New York hedge fund and a further $1M from friends and family. We wrote the contracts, ran the audit, built a wrapped-Bitcoin vault worth about $1M, and launched the token on Ethereum mainnet.

$62Mof DEX volume, $40M of it in the first 24 hours.

$317Mpeak fully diluted valuation, nine minutes after the first trade.

1,403wallets traded on day one, across 4,739 swaps.

Launch day: price and cumulative volume, first 24 hours

Read the case study

2026, Robinhood Chain and Solana

Stable, a dollar backed by mortgages

Matthew is the founding engineer at Stable, which issues USDX against American home mortgages. We built its infrastructure, staking and redemption, a Chainlink pre-deposit, and a lending portal for mortgage lenders in five days.

$1.42Mof USDX in circulation.

Stable's lending portal: a $75M warehouse line with collateral aging and items needing attention.

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November 2026

Baum, a trading desk you can text

Baum is an AI agent that runs an onchain account over Telegram and text. We built its trading terminal, from prototype to live data in four days, along with the trading underneath it and the contracts for bundled launches.

Baum's trading terminal: a dark list of tokens with prices, progress to graduation and buy buttons.

Read the case study

October to November 2026

corkboard, one board for every agent

corkboard is our own product: each Claude Code session is a card on a project board, with review built in. We built it for Neovim, the desktop, the browser and the phone, and shipped signed releases for macOS, Windows and Linux.

17 daysfrom the first commit to release candidate 9.

The corkboard board: two cards Claude has finished, marked low risk, above backlog, ready, doing, review and done columns.

Read the case study

Scale of work

$300m+peak value of tokens held in contracts we wrote for clients.

36 open-source repositories integrated with a fuzzer, leading to 5 potential zero-day findings.

28,725combined GitHub stars across those repositories.

Who you'd work with

Matthew Jurenka

Matthew Jurenka

Founder and lead engineer

Every engagement is led by Matthew, who writes the code himself.

Matthew's professionalism and talents are top notch. He helped us hone our requirements and suggested multiple workarounds to unforeseen implementation challenges. Our experience with him was contract work at its best.

Taylor Heinecke, CEO of BLOCKY, a ZKP/TEE oracle service

The video tutorials really helped me learn Sui. I appreciated seeing the transition from an empty TypeScript file to a working example, the debugging of small issues, and the context added to the problem at hand.

George-Charles Brain, developer who learned from our tutorial series

Contact

We only do business from the Telegram account @mjurenka. Anyone else using our name is not us. Read the notice.