# Arthur Galiullin — Smart Contract & Backend Engineer

> **Smart Contract & Backend Engineer** — Warsaw, Poland
>
> **Available now — actively seeking**
>
> One of six core engineers on an exotic perps DEX, from testnet through TGE. Four years of Solidity, eight years of production engineering.
>
> Contact: [work@arthurka.eu](mailto:work@arthurka.eu)

## At a glance

- **Overlay Protocol — testnet to TGE** — $2.9M raised. Exotic perps DEX on BSC. Polychain Capital, 1kx and ParaFi backed; audited by Spearbit, Trail of Bits and Nethermind. One of six core engineers.
- **Shiva Router** — 30,000+ on-chain transactions. The upgradeable router in front of Overlay's immutable core contracts. Because the core can't change, the router is also where the protocol decides which systems may call which functions. ([BscScan](https://bscscan.com/address/0xeB497c228F130BD91E7F13f81c312243961d894A))
- **ETHGlobal Prague 2025 · ETHWarsaw 2025** — 2× hackathon prize winner. LayerZero General Prize for StreamBeam, built solo in 36 hours. Prize with the InSure team at ETHWarsaw. ([StreamBeam source](https://github.com/arthurka-o/streambeam))

## Experience

- **Independent — Personal Projects** (June 2026 – Present, Remote). Actively seeking work, with personal projects on the go alongside it.
- **[Overlay Protocol](https://overlay.market/) — Protocol Engineer** (May 2024 – May 2026, Remote). Exotic perps DEX on BSC. One of six core engineers, from testnet through TGE.
- **[KUMO](https://kumo.earth/) — Solidity Developer** (March 2022 – January 2024, Remote). Lending protocol secured by carbon credits. Selected for the ABN AMRO + Techstars Future of Finance Accelerator. One of two Solidity developers.
- **Ruby on Rails Developer — Multiple companies** (2016 – 2022, Remote). Six years of backend and full-stack engineering across three companies and products.

## Skills

- **Protocol**: Solidity, Foundry, Hardhat, EVM, UUPS, Diamond Pattern, OpenZeppelin, Chainlink, Tellor, Safe, Zodiac, Merkle Trees, LayerZero, Chimera, TypeChain
- **Backend**: TypeScript, Node.js, Ethers.js, Viem, NestJS, Express, Python, GraphQL, PostgreSQL, MongoDB, REST APIs, The Graph, Ruby on Rails, Pundit, Sidekiq, Kamal
- **Frontend**: React, Next.js, Tailwind CSS, wagmi
- **Testing**: Jest, Vitest, Chai, Playwright, Supertest, RSpec, Capybara
- **Infrastructure**: Amazon Web Services, Docker, GitHub Actions, CI/CD, Git

## Education

- **M.Sc. Computer Software Engineering** — KFU, Institute of Information Technology, 2018 – 2020
- **B.Sc. Applied Informatics** — KFU, Institute of Information Technology, 2014 – 2018

## Working setup

- **Availability**: Available now — actively seeking
- **Notice period**: Immediate
- **Based in**: Warsaw, Poland
- **Timezone**: CET/CEST (UTC+1/+2)
- **Work mode**: Remote
- **Engagement**: B2B / contract or employment
- **Relocation**: Not relocating
- **Work rights**: Authorised to work in Poland

## Languages

- **Russian**: Native
- **English**: Professional
- **Polish**: Intermediate

## Full content

- [Complete CV as markdown](https://arthurka.eu/llms-full.txt): every role with its highlights, every project with its own detail, education and working setup.
- [CV as PDF](https://arthurka.eu/cv.pdf): the same CV as a document to read or forward.
- [GitHub](https://github.com/arthurka-o): public repositories.
- [LinkedIn](https://www.linkedin.com/in/arthur-galiullin/): professional profile.
- [Upwork](https://www.upwork.com/freelancers/~016038237dd7ada953): freelance profile, for contract work.