Артем

ARTEM ZNAKHORENKO
SENIOR FRONTEND ENGINEER | REACT / TYPESCRIPT
Kyiv, Ukraine | Fully Remote | [open contact info](look above in the "contact info" section) | LinkedIn | GitHub | Telegram

PROFILE
Senior Frontend Engineer with nearly 6 years of commercial experience building React/TypeScript products, including
complex B2B CRM, telemedicine, scheduling, communication and trading interfaces. Strong focus on hands-on product
engineering, frontend architecture and performance optimization, with experience leading a small frontend team and
making technical decisions.

TECHNICAL SKILLS
Core React, TypeScript, JavaScript, React Router, Redux Toolkit, RTK Query
UI & Frontend Mantine, SCSS/SASS, CSS-in-JS, responsive UI, complex interactive interfaces
Performance rendering optimization, bundle-size optimization, cold-load optimization, react-virtualized,
debounce/throttle
Testing & APIs Jest, Mocha, Chai, REST APIs
Delivery & Tooling Git, Vite, Jenkins, Docker, nginx, Cloudflare, PostHog, Firebase
Additional Sendbird, Webflow, web3, Node.js/NestJS, JWT

EXPERIENCE
Team Lead | Ensuria Technologies OÜ Jul 2024 - Aug 2026
• Built a complex appointment calendar from scratch for operators, then redesigned its rendering approach and reduced
load time from about 10 seconds to about 2 seconds, including backend request time.
• Continuously improved frontend performance across the product through rendering, cold-load and bundle-size
optimization; individual improvements ranged from incremental gains to roughly 40% in targeted areas.
• Contributed across an internal B2B platform spanning CRM, telemedicine, appointment scheduling and Direct - an
operator-to-client communication product designed as a Zendesk alternative.
• Evaluated UI-library alternatives and helped select Mantine to replace fragile custom components, improving
consistency and maintainability for a team that included junior engineers.
• Owned frontend code quality and technical decisions, reviewed pull requests, and led a frontend team of up to 4
engineers while staying primarily hands-on.
• Improved deployment tooling, including automated Cloudflare cache purging after deployments, and contributed to
CI/CD configuration.
Tech: React, TypeScript, React Router, Vite, Mantine, Redux Toolkit, RTK Query, Sendbird, Firebase, PostHog, Jenkins, Docker, nginx,
Cloudflare

Frontend Developer | DEMAX Digital Dec 2023 - Jul 2024
• Worked on a React-based CRM project, implementing and maintaining product functionality, data fetching and
visualization, and complex functional UI components.
• Provided ongoing maintenance and bug fixes after the main development phase.
Tech: React, TypeScript, Redux Toolkit / RTK Query, REST APIs, MUI

Frontend Developer | Profisea Sep 2022 - May 2023
• Built new product features, articles, mail-related functionality and widgets from scratch, and enhanced existing
functionality.
• Collaborated with backend developers, designers and marketing, and supported junior frontend developers.
Tech: React, TypeScript, Redux Toolkit, Thunks, SCSS/SASS, Jest, REST APIs

Frontend Developer | Totallib & Kattana projects Sep 2020 - Sep 2022
• Progressed from a junior role on Totallib to broader frontend ownership on Kattana across two consecutive products for
the same employer.
Kattana (May 2021 - Sep 2022): Implemented real-time trading interfaces, charts, widgets, animations, administrative
and analytics tools; contributed to performance work and a substantial frontend rewrite using Atomic Design.
Totallib (Sep 2020 - May 2021): Served as the sole frontend developer under technical supervision and delivered the
frontend from inception to MVP in about six months, including a rich-text editor, linked notes and GPT-3 integration.
Tech: React, TypeScript, Redux, Redux Saga, SCSS/SASS, Styled Components, Material UI, REST APIs, Mocha, Chai, Git

EDUCATION & LANGUAGE
National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” | Bachelor's degree, Software
Engineering (121), Faculty of Informatics and Computer Engineering | 2016-2020
English: B2+/C1