Роман

VIZNIJ ROMAN

F R O N T E N D D E V E L O P E R

I was born in a small town called Rakhiv in
1996, which is surrounded by mountains. I am
responsible and creative person who's always
trying to learn something new. I have some
experience in a various fields. Mostly I fell
comfortable working at the computer

EDUCATION EXPERIENCE
FERENC RAKOCZY II. MARKUP DEVELOPER
TRANSCARPATHIAN HUNGARIAN
FREELANCE | Oct 2021 - Sep 2022
COLLEGE OF HIGHER EDUCATION
Major: Math and Computer Science FRONTEND DEVELOPER
Sep 2013 - May 2017 IQua | Dec 2022 - Sep 2026

LANGUAGES SKILLS
ENGLISH - B2 Programming Languages Build Tools & Development
HUNGARIAN - C1 JavaScript (JS), TypeScript (TS) Docker, Webpack, Gulp,
UKRAINIAN - FLUENT Nx, Git
Frontend
Angular, React, RxJS, NgRx, AI
HTML5, CSS3, Flexbox, Claude & Cursor
CONTACT Bootstrap, Tailwind CSS, (agents, skills, MCP)
PrimeNG, jQuery
Databases & Services
[open contact info](look above in the "contact info" section)
CSS Preprocessors SQL, PostgreSQL, MySQL,
SASS / SCSS, LESS, Stylus Firebase
[open contact info](look above in the "contact info" section)
Testing CMS
github.com/roman-viz Unit, Component & E2E testing; WordPress, Joomla
Karma, Mocha, Chai, Sinon,
viznij-roman.is-a.dev Jasmine, Cypress, Playwright Mobile Development
Ionic, Capacitor
Backend & APIs
Node.js, NestJS, Express.js, Design & Multimedia
REST API, WebSocket, Figma, Photoshop
TypeORM

PROJECTS

Fat Finger
Migrated a large legacy application from AngularJS to modern Angular, refactoring existing
components and adapting the codebase to the new architecture. Developed and maintained
new features, improved existing functionality, and contributed to the ongoing modernization of
the platform.

Symphony (Taxonomy)
Core front-end developer on a large enterprise ad-tech application for campaign taxonomy
management and automated name generation. Built and evolved the spreadsheet-based
generator — hierarchy rules (parent / child / sub-child / standalone), formula parsing and
validation, copy-paste, fill-in-range, bulk import/export — and delivered integrations with
CM360, DV360 and Prisma (RFP export). Optimized rendering and data-processing
performance for spreadsheets with tens of thousands of rows, led successive Angular
upgrades (v10 → v12 → v14→ v21) together with the shared internal UI library, and
refactored and stabilized the unit, component and integration test suites (Karma/Mocha,
Cypress).

Symphony (Campaign Builder)
Developed features for a workbook-driven media campaign setup application covering search,
social, DSP/programmatic, direct buys and ad trafficking. Implemented and stabilized ad-server
and ad-trafficking flows (CM360 campaign/placement matching, publishing, market briefs,
autosave), eliminated duplicated API calls and reworked request lifecycles to improve
responsiveness, and refactored the main workbook component to configuration-driven logic.
Integrated the taxonomy application as a git submodule to provide in-place name generation.

Symphony (Master Data Management)
Contributed to a Master Data Management application from an early stage as one of its main
developers. Implemented schema-driven dictionaries and cross-system value mappings —
dynamically generated grids, columns and filters built from backend schemas, list and mapping
views, "Map Values" modes, export, server-side pagination, search and filtering. Improved
data-grid UX and performance for large lists, enforced validation and normalization rules, and
continuously refactored large components into smaller maintainable pieces, backed by unit
tests and Playwright integration/e2e suites.

Fittra PM
Firebase project management platform for a construction company (projects, estimates,
finance, HR, maintenance, client portal). Implemented third-party integrations, activity logs,
permissions and API tokens across front end, Firestore rules and Cloud Functions; extended the
AI layer with MCP servers exposing business data to LLM agents; covered features with Jest
and Playwright (Firebase emulator).

FactMe
Designed and developed a cross-platform mobile application for discovering curated facts
across multiple topics. Built the Angular/Ionic/Capacitor architecture, multilingual content
system, topic-based fact browsing, favorites and history, daily quizzes with streaks and
progression, IQ tests, themes, and scheduled local notifications. Integrated Firebase services,
optimized local data loading and state management, and implemented Android-specific
notification scheduling and customization.