Марк

Mark Opria
React Developer — Kyiv, Ukraine
Telegram: @markopria | LinkedIn: /vogue-dev/

PROFILE
I'm a Front-end software engineer with more than six years in software
engineering. Strong expertise in software development (e-com, gambling, social apps)
as a Front-end developer. Additionally, I have experience managing a small team of
front-end developers. Experienced in solving complex problems efficiently, adapting
quickly to changes, and handling new challenges. Planned, developed and
implemented large-scale projects from initial concept to completion.

WORK EXPERIENCE
Senior Frontend Developer, Playtech
Oct 2021 — Present
●​ Developed CRM platform for player engagement management, empowering
admins to control user rewards, notifications, bonuses, and behavior tracking.
●​ Led the front-end development using React, Redux, TypeScript, SCSS, and
integrated data sources via REST, GraphQL, and WebSocket for real-time data
updates.
●​ Engineered forms and data tables with validation layers, enhancing admin
workflows and productivity.
●​ Implemented advanced store caching, lazy loading, code-splitting optimizations,
resolving deep architectural issues.
●​ Mentored and led a small front-end team, conducted code reviews, and
organized technical interviews.​
Tech stack: TypeScript, React, Redux, SCSS, WS, REST, GraphQL, SCSS, MUI,
Jest, Enzyme, Jenkins

Frontend JS (React) Developer, Ciklum
Dec 2020 — Oct 2021
●​ Developed three real-time games that combine video streaming and gaming
processes, focusing on a responsive, cross-browser UI.
●​ Engineered a real-time betting system with TypeScript, React.js, RxJS, and
WebSocket for seamless live interactions.
●​ Built architecture and reusable features like a chat system and betting limitation
tools, optimizing user experience and responsible gaming measures with a focus
on high-load platform optimization.​
Tech stack: TypeScript, React, Redux, SCSS, WebSocket, REST, GraphQL,
SCSS, MUI, Jest, Enzyme

Frontend Developer, Adcredo
Jul 2020 — Jan 2021
●​ Developed marketing all-in-one application with automating advertising
campaign reporting using React, and Redux that aggregated data from social
media sources like Instagram and Facebook, Google Ads, etc. used REST APIs.
●​ Built an interactive dashboard with customizable drag-and-drop data
visualization reports with reusable line/pie/bar/funnel charts.
 ●​ Implemented a dynamic grid system, allowing admins to arrange data
components as they want for flexible report automation.​
Tech stack: JavaScript, React, Redux, SCSS, HTML5

Junior Frontend Developer, Vinyl4you
Jun 2019 — Sep 2020
●​ Improved the UI of an e-commerce platform by enhancing existing features and
adding new ones.
●​ Collaborated closely with designers and backend team.​
Tech stack: JavaScript, SCSS, HTML5, PHP

EDUCATION
2012 — 2016, NTUU 'Kyiv Polytechnic Institute', Kyiv
2024 — Present, Mariupol State University, Master's in Systems Analysis

SKILLS
TypeScript, JavaScript
React.js, Next.js, Redux, RxJS, MobX
Material UI, Tailwind, SCSS, HTML5
REST, GraphQL, WebSocket
Jest, Enzyme
Jenkins, Sentry, Checkmarx, Webpack, Bitbucket, Git

LANGUAGES
English — Upper Intermediate
Ukrainian — Native

COURSES
Mar 2020 — Apr 2020: Modern React with Redux [Udemy]
Aug 2024 — Oct 2024: Clean Code and Design Patterns [robot_dreams]