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ABOUT_

A Web3 engineering partner that owns architecture rather than tickets — and says no to products that should not be built
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How we work

Ownership, not staff augmentation

We own the architecture, not the ticket queue. Protocol-level systems get designed, not assembled from requirements handed down to us.

Audit-ready by default

Audit readiness is the baseline, not an upgrade. Threat modelling starts at design, and code goes to auditors with a 100% branch coverage baseline.

Honest analysis first

We challenge assumptions before writing code, and we reject products that should not be built. Saying no at the analysis stage is cheaper for everyone.

Depth over a longer list

EVM and Solana in production, plus zero-knowledge systems. We would rather name what we have shipped than list every chain we could learn.

How we got here

2020

Founded

Mark Virchenko starts RedDuck as a smart contract engineering team.

2022

Fiftieth client

Engagements grow from individual contracts to full protocol architecture.

2024

Ukrainian entity

RedDuck LLC registered in Kyiv.

2025

Cyprus entity

Redduck Limited registered in Larnaca.

Who does the work

Engineers, product architects and builders working remotely across Europe. Teams are scoped per protocol rather than assigned from a bench, and the people who design a system are the ones who ship it.

The team by function and stack →
Mark Virchenko

Mark VirchenkoChief Executive OfficerLinkedIn

Where we are registered

Kyiv, Ukraine

Saperne pole 12Kyiv 01042+380502147263

Larnaca, Cyprus

2 Grigori Afxentiou, Akamia Center, office 15Larnaca 6023+35796333210

Remote, mostly across Europe — the addresses above are where the company is registered, not where the work happens.

Checkable elsewhere

Clutch5.0 / 5.0 (14 reviews)Upwork5.0 / 5.0 (28 reviews)GitHub29 public repositoriesLinkedInMedium

Audit partners

Hacken and Sherlock — audits are coordinated with them, and code reaches them audit-ready rather than as a first draft.

_FREQUENTLY ASKED QUESTIONS

Pixel-art question mark cube
The team is remote, mostly across Europe. The company itself is registered in Kyiv, Ukraine and Larnaca, Cyprus — those are registered addresses rather than places the team works from.
Audits are coordinated with Hacken and Sherlock. Code reaches them audit-ready — threat modelling starts at design and a 100% branch coverage baseline is met before submission, so audits find design questions rather than missing tests.
A partner. We own protocol architecture rather than working a ticket queue, and we design tokenomics and governance alongside the code. If you need staff augmentation, we are the wrong fit and will say so.
Full authority handover at mainnet release, then a warranty period of 20 to 100 business days scaled to project size, during which fixes are free. After that, maintenance moves to a retainer if you want one.
EVM chains and Solana are where the work happens day to day, alongside zero-knowledge systems. We name what we have shipped rather than listing every chain we could learn.
Yes. We challenge assumptions at the analysis stage and reject products we do not believe should be built, including speculative launches without a security or audit budget.