Denis is available for hire
Hire DenisDenis Baturin
Verified Expert in Engineering
Blockchain Analyst and Android Developer
Location
Tbilisi, Georgia
Toptal Member Since
May 19, 2021
Denis is a blockchain analyst and a Solidity and Android developer. He has been in charge of everything blockchain-related in a hardware wallet company for over two years. He has integrated 10+ blockchains for a hardware wallet Android app in Kotlin and Java and developed a self-sovereign identity (SSI) POC app. Denis is experienced with smart contracts and NFTs and has a solid background as a system administrator and tech support.
Portfolio
Tangem
Android Studio, Java, Kotlin, Blockchain, Bitcoin, Ethereum...
Toptal Client
Blockchain, Solidity, Non-fungible Tokens (NFT), Cryptocurrency
Toptal Client
Blockchain, Solidity, Non-fungible Tokens (NFT), Cryptocurrency
Experience
Availability
Part-time
Preferred Environment
Android Studio, Slack, GitHub, Jira, Bitbucket, IntelliJ IDEA, Hardhat, Remix IDE
The most amazing...
...app I developed was the Tangem Android app for interacting with a hardware wallet. I built almost everything blockchain-related at the time.
Work Experience
Blockchain Analyst | Android Developer
2019 - PRESENT
Tangem
- Analyzed over 30 blockchains and blockchain-related services for compatibility with Tangem cards and complexity of integration.
- Implemented support of different blockchains in the Tangem Android app, including Bitcoin, Ethereum, XRP, Bitcoin Cash, Litecoin, Binance Chain, Stellar, Cardano, Tezos, RSK, Matic, EOS, and Ducatus.
- Redeveloped all the blockchain-related code we had at the time written in Java for our new app, made entirely in Kotlin.
- Made a core of a demo app made to show Tangem cards possibilities as an ID product, based on self-sovereign identity (SSI) paradigm, decentralized identifiers (DID), and verifiable credentials.
- Analyzed EVM smart contracts and developed a couple of them for testing or POC purposes.
Technologies: Android Studio, Java, Kotlin, Blockchain, Bitcoin, Ethereum, Android Development, Jira, Bitbucket, GitHub, Smart Contracts, APIs, Self-sovereign Identity (SSI), Distributed Ledgers, Distributed Ledger Technology (DLT), Cryptocurrency Wallets, Non-fungible Tokens (NFT), Ethereum Smart Contracts, Blockchain Platforms, Solidity, Remix IDE, Cryptocurrency
Solidity Expert
2022 - 2023
Toptal Client
- Designed and developed smart contracts for a complex decentralized finance project with multiple tokens and relations between them.
- Provided detailed documentation on smart contracts and blockchain interactions.
- Assisted with back-end and front-end blockchain integration.
Technologies: Blockchain, Solidity, Non-fungible Tokens (NFT), Cryptocurrency
Solidity Developer
2022 - 2022
Toptal Client
- Designed and developed smart contracts for an upgradeable NFT marketplace platform with class-based ERC1155 tokens with different purposes and flows.
- Provided detailed documentation on smart contracts and blockchain interactions.
- Assisted with back-end and front-end blockchain integration.
Technologies: Blockchain, Solidity, Non-fungible Tokens (NFT), Cryptocurrency
Senior Blockchain Developer
2021 - 2022
Toptal Client
- Designed and developed smart contracts for an upgradeable ERC1155-based revenue distribution platform.
- Provided detailed documentation on smart contracts and blockchain interactions.
- Assisted with back-end and front-end blockchain integration.
Technologies: Blockchain, Solidity, Non-fungible Tokens (NFT), Cryptocurrency
Blockchain Developer
2021 - 2022
Facerent Technologies
- Designed and developed smart contracts for an upgradeable NFT platform with on-chain signature checks.
- Provided detailed documentation and comparison with current technologies for patenting.
- Assisted with back-end and front-end blockchain integration.
Technologies: Blockchain, Non-fungible Tokens (NFT), Ethereum Smart Contracts, Smart Contracts, Solidity, Remix IDE, Hardhat, Blockchain Platforms, Cryptocurrency
Blockchain Specialist
2021 - 2021
Bitus Labs
- Designed the architecture for an auction-based decentralized exchange.
- Analyzed complexity and costs for different approaches for on-chain order matching/execution.
- Supervised and reviewed smart contract development.
- Assisted with back-end and front-end blockchain integration.
Technologies: Blockchain, Ethereum Smart Contracts, Smart Contracts, Decentralized Finance (DeFi), Solidity, Remix IDE, Hardhat, Blockchain Platforms, Cryptocurrency
System Administrator
2018 - 2019
Tangem
- Provided all the IT support and maintenance for the startup company.
- Managed a variety of cloud services, including Azure server with Ethereum node.
- Made a dozen of bash scripts for blockchain services state checking and simple data conversion.
Technologies: Linux, Bash, Blockchain, Distributed Ledgers, Distributed Ledger Technology (DLT), Blockchain Platforms, Cryptocurrency
System Administrator
2016 - 2018
Compulink
- Moved user environments from their desktops to the server-hosted virtual machines.
- Managed user accounts in Active Directory and Microsoft Exchange Server.
- Solved a variety of server-side and network problems.
Technologies: Windows Server, Microsoft Exchange Server, Active Directory Federation
Head Of Technical Support
2016 - 2016
Compulink
- Managed the client-side of IT support in a big company with 500+ employees.
- Decreased a count of concurrently open issues for our division approximately by half, from around 40 to around 20.
- Started the transition from desktop environment to thin clients.
Technologies: IT Support, Team Leadership
Technical Specialist
2013 - 2016
Compulink
- Analyzed and solved several IT problems on a daily basis.
- Learned to communicate with conflicting users, de-escalating difficult situations.
- Resolved the top management IT problems as the best specialist in our division.
Technologies: IT Support
Experience
Tangem Blockchain SDK Kotlin
https://github.com/tangem/blockchain-sdk-kotlinA module used in the Tangem Android app for interacting with blockchains. It's my main project, and most of the code here is written by me. The frame for it was developed by another developer. I moved the blockchain-related features we already had implemented in our previous Java Android app and continued implementing new blockchains, features, and fixes.
Tangem App Android
The main Tangem app is used for interaction with Tangem cards and using them as a hardware wallet. It was first written in Java and had two blockchains supported, Bitcoin and Ethereum. I've added the support for ten more and did all the bug fixes and some small improvements for almost a year, as I was the only developer at the time.
We later hired a new development team, re-made the app from scratch in Kotlin, and put all the blockchain-related stuff to the Tangem Blockchain SDK Kotlin module. I didn't work on this project a lot since then.
We later hired a new development team, re-made the app from scratch in Kotlin, and put all the blockchain-related stuff to the Tangem Blockchain SDK Kotlin module. I didn't work on this project a lot since then.
FazzMe.com
A social media NFT marketplace where users can monetize their individuality and talent. I analyzed possible solutions and blockchain platforms, designed blockchain-side architecture, made all the smart contracts at the time, documented them, and assisted in the integration and debugging.
Skills
Platforms
Blockchain, Ethereum, Blockchain Platforms, Windows Server, Linux
Other
IT Support, Bitcoin, Distributed Ledgers, Distributed Ledger Technology (DLT), Cryptocurrency Wallets, Non-fungible Tokens (NFT), Cryptocurrency, Programming, Android Development, Smart Contracts, APIs, Self-sovereign Identity (SSI), Ethereum Smart Contracts, IP Networks, Team Leadership, Active Directory Federation, Analysis, Decentralized Finance (DeFi)
Languages
Kotlin, Solidity, Bash, Java
Frameworks
Hardhat
Tools
Remix IDE, Android Studio, Slack, GitHub, Jira, Bitbucket, IntelliJ IDEA
Storage
Microsoft Exchange Server
Education
2009 - 2014
Engineer's Degree in Information Systems
Moscow State University of Economics, Statistics and Informatics (MESI) - Moscow, Russia
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