Ivan

Contact
Kyiv, Ukraine
Ivan Koltsov
[відкрити контакти](див. вище в блоці «контактна інформація») (Mobile) AI/ML ChatGPT/Tensorflow Ethers.Js/Web3 React 19/Next
[відкрити контакти](див. вище в блоці «контактна інформація») 15/Redux/Recoil/Remix/Angular Contentful/Salesforce PWA/
SPA JavaScript/TypeScript AWS/Azure/GCP GraphQL/REST/
[відкрити контакти](див. вище в блоці «контактна інформація»)
WebSockets Deno/Express/Nest.Js/Node.Js/Python/Serverless
koltsov-3016763a (LinkedIn)
t.me/kreejob (Personal)
Kyiv, Kyiv City, Ukraine

Top Skills Summary
Rapid Learning ✔AI: ChatGPT, Leonardo, MaxAI, Midjourney, Keras/TensorFlow,
Creative Problem Solving Zebracat
Communication ✔Focus: TypeScript, Angular|React, Node.Js
✔Domains: Web3 & FinTech/MedTech & Media/Telecom/Travel
Languages ✔Prefer: AI|PWA|SPA|Web3, 100% Front-End Angular|React or
JavaScript (Native or Bilingual) 50% Front-End & 50% Node.Js
Ukrainian (Native or Bilingual)
Java (Native or Bilingual) ✔Developed: BE:Browser Extensions, PWA:Progressive Web App,
TypeScript (Native or Bilingual) SPA:Single-Page App, SSE:Server-Sent Events, SSR:Server-Side
English (Full Professional) Rendering using BDD|TDD approach

Certifications ✔Overall 10+ years of professional experience in ME(A|R|S)N
CoffeeScript stack: JavaScript|TypeScript|ECMAScript 2015-2024, AWS|Azure|
Real Time Web with Node.js GCP, GraphQL|REST, Elastic, Firebase, MongoDB|Mongoose,
Building Blocks of Express.js
Front-End|Web UI & Lambda|Node.Js|Serverless, HTML5|CSS3,
Blasting Off With Bootstrap
Contentful|Express|Hapi|Koa|Loopback|Nest, Next|Socket.Io,
Staying Sharp With AngularJS
Angular|React|Svelte, Bit|Lerna|Yarn Workspaces, Rollup|Webpack,
MicroFrontends|MicroServices, Module Federation|MonoRepo using
Agile: Kanban|Scrum|SAFe

✔Skills:
• Language: EcmaScript 2015-2024, JavaScript|TypeScript
• FrontEnd: Angular, React|Next|Gatsby, Svelte|Sapper, MobX|
NgRx|NgXs|Recoil|Redux, Ionic|Phonegap, Ant Design|Bootstrap|
Material UI|Tailwind, Storefront, Backbone|Marionette, Knockout|
Durandal
• BackEnd: Deno|Node.Js, C#, Java, Go, Python, SQL
• Library: Web3, Ethers, Axios, Babel, jQuery, Lo-Dash, Handlebars|
Jade, HLS, D3|Rechart, Immer, Inversify

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• BPM/CMS/CRM: BigCommerce|Contentful, Joomla|Drupal|
Wordpress, Camunda|Liferay|Magnolia, MSDynamics|Salesforce,
SendGrid
• RIA: ASP.NET Web Forms|Mvc|Core, JSP|JSF|JSTL, Primefaces|
Richfaces, Vaadin
• Web: BEM, JSX, Components, AMD|Common.Js|UMD, Require.Js|
System.Js, Rx.Js, Ajax|Promise|Observable, Closures, CORS,
CQRS, JSON|JSONP, RegExp, HTML5, CSS3, CSS Modules,
LESS|SCSS|Stylus|PostCSS, Passport.Js
• REST/GraphQL: Flask, Swagger, Relay, Express|Hapi|Koa|
Loopback|Nest, Jax-WS|RS, ASMX|WCF|Web Api
• Design: Ant|Bootstrap|Material|Tailwind
• DB: Amplify, Firebase, Apollo Server, MongoDB|Mongoose,
MySQL|MsSQL, Sequelize, Redis
• Web Server: Apache, IIS, JBoss|Jetty|Tomcat, NGinx
• Build: Browserify|Rollup|Vite|Webpack, Bower|Lerna|NPM|Yarn,
Grunt|Gulp, ES|TS|SCSS-Lint
• BDD/TDD: Chai|Cypress|Jasmine|Jest|Vitest, Karma|Mocha|Sinon|
Protractor|Puppeteer
• CI/CD: AWS|Azure|GCP|Heroku, CloudFront|EC2|S3, Jenkins|
TeamCity, Docker|Kubernetes|Terraform
• VC: Bitbucket, GitHub|GitLab, TFS
• OS: MacOS
• IDE: Cursor, VsCode

✔Responsibilities:
• Prototype, research & development of new Feature/Epic/MVP
• Plan, architect & development of GraphQL/REST API
• Design & implementation of Web component/UI layout
• Delivery & deployment of tested/fully integrated product
• Code refactoring/integration, unit test/bug fix

Experience
outstaff.com.ua
Lead AWS|GCP & Blockchain|Crypto & React & Node.Js/Nest.Js & AI|
JavaScript|TypeScript Developer
April 2019 - Present (5 years 8 months)
Working on most popular B2B/B2C ChatBots & Video Streaming App using
React.Js/Next.Js & Go & Python & Azure/AWS/GCP & Langchain-openai
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Worked on most popular best Media/Video Entertainment/TV providers using
AI/ChatGPT/Cloudinary/Midjourney/Tensorflow & Svelte & Next.Js/React.Js &
Node.Js/Nest.Js & AWS/Azure/GCP

Worked on upgrade of legacy Monolith Business travel CRM/Platform
transformation for HRS Group: Java/JSP/JSF/SAP/Vaadin to Internal UI:
Angular/Ionic/NgRx & Public UI: React.Js/Next.Js using MicroServices API:
Java/Nest.Js/Node.Js & Azure

Projects hosted on Azure, AWS & GCP using costs saving strategy

Responsibilities:
* Dynamic AI video advertising Canva/Leonardo/Midjourney
* Keycloak to AWS Cognito
* Development of MVPs for PoCs
* Innovation of Google Chrome extension using Svelte.Js & integrated with
React.Js/Next.Js
* Transformation of SPA to MicroFrontend
* Business requirements decomposition into user stories using Agile/SAFe
* AWS & Azure & GCP Node.Js Lambdas & MicroServices & WebHooks
* RollUp & Webpack integration to run both React.Js & Svelte.Js
* Node.Js: Hapi.Js/Express.Js/Nest.Js/Socket.Io
* Rewards based Advertisement’s using Ethers.Js/Web3.Js
* Code refactoring
* Bug fixing

Technologies:
Angular, React 19, Canva, HTMX, Cypress, Flowbite, Tailwind, Signals, Java/
Spring Boot, Svelte/SvetleKit, Web 3/Ethers.Js, Smart Contracts, Babel,
Hls.Js, JavaScript/TypeScript, React Native, Expo, Context/Hooks, Immer,
Recoil/Redux-Toolkit/Thunk/Saga/Remix/RTK Query, Nest.Js/Next.Js/
Node.Js, Create-React-App customization, Ant Design, Material UI, Axios,
Progressive Web Application, Chrome Web Extension, Git/Gerrit, Custom Grid/
Theme, Anima/Figma/Invision, Primefaces/Vaadin, JaxRs, GCP Services,
AWS Amplify/Cognito/Keycloak/Lambda/SST, MicroFrontend/MonoRepo,
Jest/Enzyme, JSS/SCSS Modules, D3, Rechart.Js/Three.js, SVG, Day.Js/
Moment.Js, Bit/Lerna, Storybook, CloudFront/EC2/S3, Lambda/Serverless,
Jenkins, Docker/Kubernetes/Terraform, PostgreSQL, DataDog

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Companybook
Brightgrove: Senior|Lead AWS|Heroku & Angular/Ionic|Node.Js &
JavaScript|TypeScript Developer
May 2018 - April 2019 (1 year)
Kyiv City, Ukraine

Worked in ScaleUp on refactoring/migration of hybrid/upgrade Angular.Js 1.6
to Angular 7 components/directives/services & Ionic & layouts/widgets & new
from scratch development of Web Components, initially was hosted on Heroku,
then migrated to AWS

Responsibilities:
* Work closely with designers and product managers/owners to provide the
best solutions
* Development of new reusable Web Components
* BackEnd-For-FrontEnd|GraphQL|REST Api|Services
* Integration with related social networks/systems
* Code refactoring
* Bug fixing

Technologies:
Figma/Zeplin, Java/Spring, Php/Symfony, Redis, Docker/Kubernetes,
Elаstic Search, Nest.Js/Node.Js, Socket.Io, REST/GraphQL, Npm/Yarn,
Express.Js, Bower/Grunt/Require.Js -> Webpack, NgRx/RxJs, Canvas,
Chart.Js, Angular.Js 1.6 -> Angular 7, Ionic, Angular-Resource -> Axios, Ng
Route -> UI Router, JavaScript -> Babel + TypeScript, Heroku -> AWS, MS
Dynamics, Apex, Salesforce, HTML5/CSS3/LESS/SCSS, Twitter Bootstrap 3
& 4/Font Awesome, Pug/Jade, jQuery/Lodash/Underscore, Karma/Jasmine,
Sentry

Qvantel
Inscale: Senior|Lead AWS & Angular.Js|Angular|React|Node.Js &
JavaScript|TypeScript Developer
June 2017 - May 2018 (1 year)
Kyiv City, Ukraine

Worked on new Web UI/Front-End components development: both Angular
1.5-5, NgRx/Rx.Js & React/Redux, MicroFrontend/Monorepo, improvements/
refactoring & integration with GraphQL + Java/Scala backend using Node.Js/
Express.Js proxy for Telecom - KyivStar/VEON

Responsibilities:

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* Implemented new UI/Web components
* Custom front-end build/environment using Gulp/Webpack/System.Js
* Development of utility Node.Js/Express.Js backend
* Integration with Java/Scala backend + GraphQL
* Code refactoring
* Bug fixing

Technologies:
On-Premise, Bower/Node.Js, Npm/Yarn, Lerna/Monorepo, Express.Js/Koa,
Gulp/Webpack/System.Js, JavaScript/TypeScript, Angular 1.5-5, Promise/
Observable, NgRx/Rx.Js, React/Redux, jQuery/Lodash, HTML5/CSS3/LESS/
SCSS/Stylus/Font Awesome/Twitter Bootstrap, REST/GraphQL, Java/Scala,
Play, Spring Boot, Cassandra/MongoDb, Karma/Jasmine/Jest

Trinetix
Senior Azure & Angular.Js|Angular|Node.Js & JavaScript|TypeScript
Developer
July 2016 - June 2017 (1 year)
Kyiv City, Ukraine

Worked on new Web UI/Front-End components development, improvements/
refactoring & integration with .NET backend & Node.Js/Express.Js for Big four
Financial Information Management & Audit

Responsibilities:
* Implemented new UI/Web components using Angular 1.5-4/NgRx, HTML5,
CSS3/LESS/SCSS/Stylus, Font Awesome, Twitter Bootstrap
* Development of utility Node.Js/Express.Js backend
* Integration with C#/.NET backend + MSSQL/Entity Framework
* Code refactoring
* Bug fixing

Technologies:
Azure, Node.Js/Npm/Yarn/Bower, Express.Js/Loopback, Gulp/Webpack,
JavaScript/TypeScript, Angular 1.5-4, jQuery/Lodash, HTML5/CSS3/LESS/
SCSS/Stylus, Font Awesome/Twitter Bootstrap, REST, C#/.NET, Asp.Net Mvc/
Web Api, MSSQL/Entity Framework, IIS, Azure, Karma/Jasmine

IntroPro
Senior AWS|Azure & Angular.Js|Angular|React|Node.Js & JavaScript|
TypeScript Developer
August 2013 - July 2016 (3 years)
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Kyiv City, Ukraine

Worked on redesign and new Web UI/Front-End components development,
improvements/refactoring & integration with Java/Scala backend for
Broadcasting/Streaming of Media/Video/TV & Telecom - AT&T/DirecTv

Responsibilities:
* Implemented new UI components using React/Redux, Angular 1.2-2, Angular
Material, Backbone/Marionette, Knockout/Durandal
* Redesigned application look and feel using HTML5 + CSS3/LESS/SCSS/
Stylus + Twitter Bootstrap
* Development of separate Node.Js/Loopback backend
* User guides
* Technical documentation
* Integration with Java/Scala backend
* Code refactoring
* Bug fixing
* Unit testing

Technologies:
AWS, Node.Js, Npm/Bower, Socket.Io, Java/Scala, Grunt/Gulp/Webpack,
JavaScript/EcmaScript 2015, React/Redux, Angular 1.3-2/Angular Material,
Backbone/Marionette, Knockout/Durandal, jQuery, Lodash, HTML5/CSS3/
LESS/SCSS/Stylus/Twitter Bootstrap, REST, Java/Scala, JEE, JSP/JSF,
Richfaces/Primefaces, PrimeNg, Play/Spring Boot, Camunda/Liferay/Magnolia,
Oracle/Hibernate, MongoDb, Jetty/JBoss/Tomcat, NGinx, Docker, Karma/
Jasmine/Jest

Ciklum
JavaScript Developer
September 2012 - August 2013 (1 year)
Kyiv City, Ukraine

Worked on Web UI/Front-End Sencha/Ext.Js components of document
management .NET Web platform for Financial Information management

Responsibilities:
* Design, Development & Refactoring of Web UI components
* Implemented Ext.Js graphic charts
* User stories implementation
* Integration with .NET web services
* Bug fixing

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Technologies:
Azure, JavaScript, Sencha/Ext.Js, HTML, CSS, C#/.NET, Asp.Net Web Forms,
Asmx Web Services, MSSQL, IIS, Karma/Jasmine

GlobalLogic
Web Application Developer
October 2009 - September 2012 (3 years)
Kyiv City, Ukraine

Worked on new web applications using C++, C#/.NET, Mono, JavaScript, Web
Services and Workflows enterprise sets of applications for Media/Video editing/
management

Responsibilities:
* Implemented Cross-Platform desktop app to export from Final Cut Pro to
Media Asset Management and vice versa
* Coordinate and collaborate with team members to design, develop and
manage project
* Analysis of business logic requirements
* Clarification of user stories with Customer
* Implemented business logic according to specification
* Code refactoring, Bug fixing, Logging improvement
* Unit testing, Technical documentation

Technologies:
Azure, C++, C#/.NET/Mono, Windows Forms/Gtk#/MonoMac, Asp.Net
Web Forms/Mvc, BPM/Workflows, ASMX & WCF Web Services, MSSQL/
NHibernate, JavaScript, jQuery, HTML, CSS, Jasmine, MSTest, NUnit, Unity,
NLog, Moq, IIS

Education
National Aviation University
Bachelor's degree, Programming Engineering

Computer Academy Step
Diploma, Computer Science

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