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Ukraine, Kyiv
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KOSTIANTYN POSTOIAN – SOFTWARE
ENGINEER

SUMMARY

• Qualified software engineer with more than 3 years of
experience in maintenance and development of web applications;
• Professionally oriented on result with excellent communication
skills, easy- going, constantly learning new technologies and
improve my knowledge;
• Team player, business and result oriented with high level self-management;
• Good understanding and skills in issues investigation;
• Company man;
• Positive and open-minded;
• And the last one but not the least important in the web-development:
I can google by myself.
SKILLS

Academic Disciplines
• Humanities: English B1+, Ukrainian, Russian
 • Applied Sciences: Object-oriented Programming, Clean Code,
Reactive Programming, Functional Programming, REST

Engineering Practices
• Digital Engagement: Accessibility in JavaScript
• Quality Engineering: Unit Testing

Managerial
• General Management: Scrum
Technologies
• Framework: JavaScript Frameworks, Webpack, Next.js,
styled components, Jest, ReactJS, Redux, Express,
• Standard: Git, AJAX
• Other: JavaScript Frameworks & Libs, Node.js Core, Javascript
Testing, Flux, JavaScript Web Platform, JavaScript Development Tools,
Document Object Model, CSS Modules, Cross-browser compatible
HTML/CSS, SCSS markup, JavaScript in Browser, Node.js Database
Experience
• Library: React Router, React Formik, yup, Redux Thunk,
React Slick Slider, React-Styled-Components, ReflexJs
• Web/Application Server: Node.js
• Solution: Jira/Trello, Confluence, ESLint, GitHub, BitBucket, Yarn,
Npm, Postman, Microsoft Word, Visual Studio Code, WebStorm
• Computer Language: JavaScript, SQL, TypeScript, HTML,
CSS, SASS/SCSS, LESS
• Operating System: Microsoft Windows
• Platform: NPM
WORK EXPERIENCE

Jun-2024 – Nov-2024 - Software Engineer,
Lengin
Customer: interintellect

Project Description: The Event Management System Project focused on
creating a comprehensive platform for event creation, editing, ticket sales,
and subscription management. The platform was designed to provide
seamless user experiences and integrate with multiple third-party payment
and membership services.
Team Size: Frontend: 2, Backend: 1, QA 1 , DevOps:1
Project Roles: JavaScript Full-Stack Developer
Responsibilities:
• Development of key features for event management, ticket sales, and
subscription systems;
• Integration of payment systems (Stripe) for ticket processing and payouts;
• Implementation of membership services (Memberful) with different
subscription tiers;
• API development and database management to support scalable backend
functionality;
• Ensuring system reliability through bug fixes, performance optimizations,
and unit tests.

Tools and Technologies:
 Frontend: React/Next.js, TypeScript, Styled-components, Next.js, Redux
 Backend: Node.js, Prisma ORM, PostgreSQL
 Payments: Stripe (Connect, Webhooks, API Integrations)
 Memberships: Memberful API
 Other Services: Zoom API (Meetings Integration), Google Calendar &
Places APIs, AWS S3
 Testing & CI/CD: Jest, ESLint, Git, Vercel for deployment
Apr-2023 - Jun-2024 - Software Engineer,
Lengin
Customer: Owndays
Project Description: The Owndays Eyewear E-commerce Project aimed
to establish an international online store specializing in eyeglass sales. The
primary goal was to create a multilingual, functional, flexible, and scalable
platform to cater to a global audience. This project was driven by the vision
of building a cutting-edge digital commerce experience.
Team Size: Frontend: 3, Backend: 6, QA 1 , DevOps:
1 Project Roles: JavaScript (react) Developer
Responsibilities:
• Development and maintenance of the client-side application;
• Integration with the content management system;
• Code review and assessment within the team;
• Sprint planning and management to ensure effective goal achievement;
• Task estimation and timely execution;
• Bug fixing and code refactoring to enhance code quality;

Tools and Technologies: React, React-slick, Redux, Redux-Saga, Algolia
SDK Search, Node.js for Server-Side Rendering (SSR), HTML5, CSS3, SCSS,
JavaScript ES6+, Npm, Jest, Eslint, Git

May-2022 - Feb-2023 - Software Engineer, EPAM Systems
Customer: Canadian Tire Corporation Limited Customer Description:
Retail & Distribution
EPAM Project Description:
Triangle select creating a subscription for Triangle Select.
Re-use existing functionality when possible, implement new features when
necessary
Enhance or fix broken or sub-optimal features.
Implement intuitive and flexible tools for site layout configuration,
templating, and content authoring.
Design and implement an extensible solution ready for ongoing evolution
and enhancements of the site components and features.
Decoupled architecture to separate look and feel from content management
Team Size: Dev Team: 3 members, Hybris developers: 4, QA: 4, DevOps: 1
Project Roles: JavaScript (React) Developer
Responsibilities:
• Developed and maintained Client side
• Perform integration with AEM
• Reviewed code
• Groomed and planned sprints
• Estimated tasks
• Performed bug fixing
• Performed code refactoring
Tools and Technologies: MySQL, MongoDB, VS code, Postman, Adobe AEM,
Git, Eslint, JIRA / Confluence, Jest, yarn, React, Redux, redux-thunk,
Typescript, HTML5, CSS, SCSS

Aug-2021 - Feb-2022 - Software Engineer, EPAM
Systems Customer: Kohler International Holdings
Limited Customer Description: Retail & Distribution
EPAM Project Description: Create two new JD sites - the international
site and site for Germany
Re-platform the existing JD sites to a single multilingual, functional,
flexible and extendable platform:

Re-use existing functionality when possible, implement new features
when necessary
Enhance or fix broken or sub-optimal
features Optimize the UI/UX design
Improve overall SEO
Implement intuitive and flexible tools for site layout configuration,
templating, and content authoring.
Design and implement an extensible solution ready for ongoing evolution
and enhancements of the site components and features.
Decoupled architecture to separate look and feel from content management.
Capable of horizontal scaling when required by an increase or a spike in
site traffic
Team Size: Dev Team: Frontend: 5 members, Backend: 4 members, QA
4 members
Project Roles: JavaScript (React)
Developer Responsibilities:
• Developed and maintained Client side
• Perform integration with an external Drupal server
• Reviewed code
• Groomed and planned sprints
• Estimated tasks

Tools and Technologies: MySQL, MongoDB, ESlint, Postman,
Bitbucket, JIRA / Confluence, yarn, NextJS,
JavaScript: ES6, ES7,
ES8, React with hooks,
Typescript,
ReflexJs, HTML5
Nov-2019 - Jul-2021 - Software Engineer,
Dinternal Education
Customer: Dinternal Education

Project Description: Course Sale Project and registration of trainings,
tracking users who attended webinars and issuing certificates
Team Size: Dev Team: 3 members, QA Team: 1 members, TL: 1 member
Project Roles: JavaScript Developer
Responsibilities:
• Upgrade old functionality and development of new functionality
• Introduction of the webpack in the project
• Written logic for generating PDF and sending certificates on email
• Performed code refactoring
• Performed bug fixing
• Adaptive layout by layouts
Tools and Technologies: In project used MySQL database,
WebStorm, Github, ESlint,
Postman., HTML, CSS, JavaScript, jQuery, Node Js, SQL