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  1. Freelancers

Nikolay Semenyuta

Building trust through blockchain technology - one block at a time.
Offer Nikolay to work on your next project.

Ukraine Kyiv, Ukraine
2 days 4 hours ago
Available for hire available for hire
6 Safe completed
3 months 18 days ago
6 Clients
registered for 1 year
Freelancer Nikolay S. — Ukraine, Kyiv. Specialization — Blockchain, JavaScript

Rating

Successful projects
100%
Average rating
10 of 10
Rating
1568
Blockchain
5 place of 479
JavaScript 1
291 place of 3952
6 projects
Blockchain
2 projects
Web programming
1 project
Python

Language Proficiency Level

Українська Українська: fluent
English English: upper-intermediate

CV

7+ years of commercial experience in software development.

4+ years of experience in blockchain development (dApps for EVM based blockchains)


Arrived as React developer then start extensive research into crypto market, DeFi, and blockchain solutions. Practical experience with Ethereum, Solidity, OpenZeppelin, React js, Truffle, Web3, Ganache, REST. Created and deployed ERC20 token smart contracts (Ethereum, Polygon nettworks, solidity). Designed and implemented frontend layer using React. js, JavaScript, CSS, HTML. Ticker module utilizing web socket channel and asynchronous API calls to receive real time market updates. Metamask wallet integration and authentication.


A lot of expirience in NFT, S olana dApps. During 2022 i ’ve launche more than 20 nf t collec tions, make my own NFT staking protocol, published a course about Solana NFT development.

Skills

Programming

Services

Outsourcing & consulting

Portfolio


  • 100 USD

    Metadata for 3D NFT Collection

    Blockchain
    Metadata for 3D NFT Collection — example of a freelancer's portfolio in the category Blockchain
    Task: Create a metadata for a full 3D display of the NFT collection in which all the images are the same. The model should be interactive both in the wallet and on the marketplace.

    Execution: A metadata with the necessary attributes was generated from scratch. The 3d example of NFT was presented below, as the author of the collection does not want disclosure.
  • 1000 USD

    Remint Solana NFT App

    Blockchain
    Remint Solana NFT App — example of a freelancer's portfolio in the category Blockchain
    Prehistory: the client released a collection on a lounchpad, where he was wrongly made a metadata and confined the entire collection + did not give access to the account authority updates.

    Task: Create a site where the user will be able to connect with the Solana crypto wallet click the "Remint" button after which all the old NFT will be destroyed and the new ones will be shut down. All of this must be done in the form of one transaction. The user should get exactly the same NFT as he had.

    … Implementation: a site was implemented on React and a smart contract with which we were able to fulfill the assigned task. The client also had to place all the metadata on his server, which we also successfully did.
  • 300 USD

    NFT collection on Ethereum

    Blockchain
    NFT collection on Ethereum — example of a freelancer's portfolio in the category Blockchain
    Task: Create a NFT collection on Ethereum

    Implementation: After the call with the customer discussed all the points, I got layers and started the generation of images with a metadata. Further, a smart contract was created with all the wishes of the customer including a revile (the beginner user doesn't know what specific NFT he got and only after a certain moment everyone sees his image and its attributes, it's done so that the flipers immediately don't throw the flora of the collection), as well as 3 sales stages were implemented: OG, WL, Public with different prices.
    A simple Mint site with a link to the contract was created. Transactions were made through a private RPC from Quicknode.
  • 50 USD

    by Solana Airdroper

    Blockchain
    Task: Write a script for the automatic sending of tokens and NFT to the Solana network to the address list.Implementation: A realised Python script based on Solana CLI with two operating modes:
    1 .The user enters the token address name and the amount of tokens to be sent to each address in the .env configuration file, then puts a list of addresses in airdrop.txt and starts the script.2ndPRO mode: The script passes and performs sendings through the airdrop.csv file that contains 3 columns: token address, recipient address, number.Advantages of the script: Before the airdrop'a start, the script removes information about the number of recipients and the amount of SOL that will be spent on the airdrop.During the sending of tokens the script creates two success.csv and fail.csv files where it holds all the addresses and signatures of transactions of successful and unsuccessful sendings, after the end of the airdrop, this information is also removed.The script itself works with both ordinary tokens and NFT.Likewise, the script does not require RPC or proxy to work and there is no chance to capture any time-outs.PS: A script review is on my YouTube channel "Blockchain Developer"
  • 300 USD

    ERC1155 Certificate for 01k Academy

    Blockchain
    ERC1155 Certificate for 01k Academy — example of a freelancer's portfolio in the category Blockchain
    Task: Make non-transferable NFT certificates for academic students.Implementation: After consultation, the decision was made to implement certificates on the basis of the ERC1155 contract in the Polygon network.I made a contract taking into account all the wishes of the customer, set a WL mint so that the certificate could only be obtained by students who successfully passed the course, uploaded a service contract that allows you to easily and without interference in the code to add new addresses to Whitelist and broke a simple landing-page on which the user can connect his crypto wallet and finish NFT.The collection page was also set on Opensea.Collections on Opensea: https://opensea.io/collection/a01k-academy

    Note: NFTs are untransmitted, while they can be displayed on Opensea, but when trying to buy them there will be a mistake.This is the feature of Opensea, because they do not prohibit the exhibition of non-transferable tokens for sale, but there is no sense in this.The certificate itself is 1 per wallet, and the money for the wallet is sent to the customer's wallet.There is also the possibility to add other certificates to the collection.
  • 20 USD

    The NFT Downloader

    Blockchain
    Task: Develop software to save images and metadata files from any NFT collections on the Solana blockchain. The software should work without RPC, proxy.
    The task is performed using the python script, which receives the hashlist collection entrance, passes through each NFT, downloads the metadata and the image. The Moralis API (Free) was used for implementation.
    The software is sold on my site, the instructions are on YouTube, ready to upgrade the software under any needs to develop any script to solve your business problem.
  • 20 USD

    Solana Account Generator

    Blockchain
    Task: Create a software that allows you to quickly generate an unlimited number of Solana accounts, then save the data in the table in the format: account, private key.
    The work was done with Python script and Solana CLI. You do not need to use proxy and third-party libraries to generate accounts. The generating speed of 1000 accounts is 5 minutes (the timetables can be reduced when purchasing RPCs). The software is ready and is sold on my website. It is possible to improve the software under any needs of any blockchain software. Go to turn.
  • 300 USD

    Free-mint NFT коллекция на Ethereum

    Blockchain
    Free-mint NFT коллекция на Ethereum — example of a freelancer's portfolio in the category Blockchain
    Задача: Сделать #NFT коллекцию на #Ethreum с бесплатным минтом, где пользователь при минте НФТ платит только за газ. + интеграция MINT кнопки на сайт заказчика. Задача была выполнена, тестовые минты проведены, но клиент до сих пор занимается подготовкой бекграунда для полноценного запуска.
  • 500 USD

    NFT Коллекция на Solana + Airdrop

    Blockchain
    NFT Коллекция на Solana + Airdrop — example of a freelancer's portfolio in the category Blockchain
    Задача: Создать #NFT коллекцию на #Solana после чего сминтить все NFT себе на кошелек, провести их #airdrop на кошельки юзеров и выложить коллекцию на такие маркетплейсы как MagicEden, OpenSea. Задача была выполнена за 2 дня, так как клиент просил сделать все срочно, цена составила 800$, без срочности цена за подобную работу ~500$. Есть большой опыт в запусках NFT коллекций на Solana, Ethereum, Flow.

    Полное видео, где я рассказал как выполнял эту работу есть на моем YouTube канале: https://www.youtube.com/watch?v=tu2f_DYuidw

  • YouTube Канал "Блокчейн Разработчик"

    Blockchain
    YouTube Канал
    Веду YouTube канал на тему блокчейн разработки, рассказываю людям о том как реализовывать dApp, запускать NFT коллекции, разрабатывать смарт контракты.
    Сейчас контент в основном о разработке под Solana и другие блокчейны, есть конкретная цель собрать аудиторию, которой интересна Блокчейн Разработка. Дальше буду обучать людей #Solidity и своему ремеслу разработки dApps под #ethereum

Reviews and compliments on completed projects 6

5 June 602 USD
The Black Dolphin V2

Quality
Professionalism
Price
Availability
Terms

Good guys, fast and always in contact.

Roman K. | Personal | Response feedback

13 May 205 USD
Mint NFT and connecting it to the site

Quality
Professionalism
Price
Availability
Terms

A top breakdown. He is responsible and knows his business.
It is easy to communicate, understands everything from the sex of the word and shows initiative.

Max Block | Personal | Response feedback

4 April 14 USD
Create metadata for Solana NFT collection

Quality
Professionalism
Price
Availability
Terms

The work was performed quality. Everything is fast and skillfully, the performer is well understood in the blockchain of the solan.
The performers themselves have unhealthy user-friendly abilities, so you will be pleased to communicate with him. I will address.

Rikardo Milos | Safe Safe | Response feedback

3 April 150 USD
A description of the cryptocurrency trading function

Quality
Professionalism
Price
Availability
Terms

Pleased with the work done! Everything is done accurately and in time. I recommend !

Alex S. | Personal | Response feedback

6 March 33 USD
Installation of Solana NFT

Quality
Professionalism
Price
Availability
Terms

Nicholas through the remote work table us to set up the already ready NFT contract, bind it to the front end and put it all on Vercel. He provided quality advice and told us the subtles we didn’t even imagine. Thanks to Nicholas we decided not to save, to buy a dedicated RPC and this saved our Mint (initially we were advised to use api.mainnet-beta.solana.com).
It’s the most skilled blockchain expert I’ve ever met. In an hour of communication, I learned about Solana more than a year in the field of nft flip.

Vladislav Morozov | Safe Safe | Response feedback

5 March 274 USD
Developing the documentation for the creation of nft

Quality
Professionalism
Price
Availability
Terms

They worked greatly. I will continue to work on the next project.

Oleg Bozhenko | Personal | Response feedback

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