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Nikita Nazarenko

(Front-end heavy) Full-Stack Engineer

Kyiv, Ukraine
Top Rated Freelancer at Upwork
Studied Computer Science at Taras Shevchenko national University of Kyiv
Program Development
Joined April 3, 2023



Native or Bilingual
Nikita has been collaborating with a variety of companies including small startups and big communities, which has made him intimately familiar with all the stages of the web lifecycle from the initial architecture to final deployment. He has extensive knowledge of front-end JavaScript and browser APIs as well as significant experience with popular frameworks and libraries like React,Redux and Vue. Nikita's deep experience includes Node.js and Express, MongoDB as well as more traditional technologies like PHP and MySQL.
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Jul 2022 – Present
San Francisco, CA
Top Rated Freelancer
● Working on MERN and MEAN stack projects from upwork ● Focusing on Web3 projects including DeFi, NFT and etc Technologies: React, Node, Express, MongoDB, AWS(S3, Lambda), Azure, GraphQL, Vue, Angular, MySQL, Web3, Blockchain
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Jan 2022 – Jun 2022
San Francisco, CA
Senior Full-Stack Engineer (FinTech)
● Worked with MVP architecture in terms of full product structure. ● Built Frontend with React/React-Native-Web/Mobx based on Figma Design and implemented pixel-perfect, re-usable components which state is handled by Mobx Tree structure. ● Converted BackOffice Admin site from Vue2/Vuex to Vue3/Pinia. ● Used Node.js and ASP.NET for backend and combined with Serverless structure by using AWS Lambda ● MongoDB was used basically for Node.js Main Backend and SQL was used for ASP.NET server ● FireBase/FireStore and AWS Security DB was used for unit testing and e2e testing and also for security environment setup. ● Integrated CBW bank api in order to implement ACH, Bank, Credit/Debit Card payment for main transaction. ● Implemented Several AI engine in order to check revenue of a company and reduce risk on loan and credit application. This could be called as Decision Engine. ● Integrated a OCR api in order to implement auto-build invoice from PDF. ● Integrated CRM with HUBSPOT api with Serverless Lambda Function based on SQS and Schedule Event. Technologies: React/React-Native, Mobx, Vue2/3, Vuex, Pinia, Node.js, Express.js, ASP.NET(core5), MongoDB, MySql, GraphQL, FireBase, AWS-S3, AWS-Lambda, AWS-EC2, GCP, Sentry, Unit/E2E testing, HubSpot, CBW, OCR, JS(EC6+)/TypeScript
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Apr 2019 – Dec 2021
San Francisco, CA
Senior Full-Stack & Blockchain Engineer
● Worked as Senior Full Stack Engineer and engineering lead of frontend team. ● Made OpenAPI with Several Modules for security of file stream transform based on crypto.js ● Built Front-end with React/Redux-Saga, BootStrap based on FIGMA design. ● Used Node.js and Golang for main system management on BackEnd ● Implemented MERKLE Tree Technology in order to handle all file/folder structure data. ● Integrated SIA api for Decentralized File Storing. ● Used AWS-S3 bucket for Centralized File Storing. ● Integrated Stripe and MetaMask for payment service. ● Implemented OPCT coin subscription for plan. ● Built OPCT token smart contract with RUST (Swap,Transaction..) Technologies: React/Redux, Vue/Vuex, Node.js, Express.js, TypeScript , Mongodb, ASP.NET, Golang, Aws-S3, Azure, SIA, Blockchain, Stripe Integration, Smart Contract, RUST, GCP, Sentry, Web3.js, Crypto.js, GraphQL
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Jan 2018 – Apr 2019
London, UK
Senior Full-Stack & Blockchain Engineer
● Worked as Front-End Developer and team lead ● Built the Frontend with by using MUI style framework. ● Completed Ghost API integration in the Cryptonary app. ● Created pixel-perfect, user-friendly, and responsive pages from Figma Design. ● Connected Phantom wallet using solana/web3.js wallet provider. ● Added Minting token functionality before the minting time passed. ● Worked with web3.js and ethers.js to connect wallet, swap CAPL to USDC, and add liquidity to their pool. ● Built Mobile App with React Native for real-time news and education course. ● Used Push Notification and module in order to keep the real-time notifications from authors on mobile app. ● Implemented Mobx for mobile app state management instead of Redux. ● Build DMHD(Company Token) NFT token smart contract with RUST. Technologies: React/Redux, React Native/Mobx, JS(EC6+)/TypeScript, Web3.js, RUST, Solidity, Ethers.js, Material UI,, Google API, NFT, Solana, RUST, WebGL, Azure
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Jan 2017 – Jan 2018
Brooklyn, NY
Senior Full-Stack Engineer
● Worked as Senior Full-Stack Engineer with React & Java. ● Built Front-End with React/Redux, Tailwind, Pixel-Perfect UX/UI based on Figma Design. ● Worked with Java/Azure for backend side and used MySQL for database. ● Re-skinned the app with new Falcon theme and design. ● Upgraded Performance of Site by implementing perfect lifecycle, and server side rendering with Next.js. ● Stripe Integration for checkout and subscription. ● Used AWS S3 in order to manage the assets of property images and information. ● Integrated sentry to track issues and google as well. Technologies: React/React-Hook, Redux/Redux-Saga, Next.js, JS(EC6+) / TypeScript, Stripe, Sentry, Falcon, GCP, Api, Java, Azure, AWS, S3, EC2
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NYU Lutheran Care at Home
Jan 2014 – Dec 2016
New York City, NY
Senior Full-Stack Web Engineer
● Worked on building health care web app. ● Wrote Python background worker scripts that mines and feeds into database daily. ● Worked with data scientists to resolve database design problems and provide exceptional customer service. ● Improved interacting with MySQL using SequelizeORM. ● Implemented full-text search for movie plot using ElasticSearch. ● Improved analytics charts using D3.js and Highcharts.js. ● Integrated self-made video stream play for online meeting with patient and doctors. ● Optimized complex database queries. ● Improved outdated Death Store platform. Technologies: React, Elasticsearch, MySQL, Sequelize, Express.js, Node.js, Python, Highcharts, D3.js, WebGL, GraphQL.
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Taras Shevchenko national University of Kyiv
Aug 2009 – Oct 2013
Bachelor, Computer Science