Святослав

SVIATOSLAV YATSYNYK
Senior Frontend Engineer — React, TypeScript, Next.js
Lviv, Ukraine (Remote) | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Telegram: @sviatkk

SUMMARY

Senior Frontend Engineer with 9+ years of experience building large-scale web applications in React and TypeScript, most
recently in the iGaming domain. Track record of owning products end to end: internal SDKs and developer tooling, back-office
platforms, and CRM systems. Comfortable across the full delivery lifecycle — architecture, code quality, CI/CD, and cloud
deployment — with experience leading development of internal platforms and working in AI-assisted development workflows.

KEY SKILLS

Languages & Core: TypeScript, JavaScript (ES2023), HTML5, CSS3, Node.js
Frontend: React, Next.js, React Native, Redux Toolkit, MobX, Context API, PixiJS
UI & Styling: Ant Design, Material UI, SASS, LESS, responsive and component-driven design
Testing: Jest, React Testing Library
Backend & Data: Node.js, MySQL, MongoDB (Mongoose), REST APIs
Cloud & DevOps: Docker, AWS, GCP, DigitalOcean, Firebase, CI/CD, DNS management, monitoring
AI-Assisted Development: Claude Code, Cursor — code generation, refactoring, and review workflows
Practices: Micro-frontend architecture, code review, estimation, refactoring, mentoring
Spoken Languages: English — Upper-Intermediate (B2); Ukrainian — Native

PROFESSIONAL EXPERIENCE

Senior Frontend Developer 2023 – 2025
FavBet Tech — iGaming; international betting and online casino operator serving millions of users across Europe
• Built a new version of the internal Game SDK with an embedded in-game editor, allowing game developers to manage
stages, position objects via drag and drop, and edit entity properties directly inside the game — removing manual JSON
config editing and significantly shortening iteration cycles.
• Designed modular UI systems for real-time editing, object manipulation, and dynamic property management of in-game
entities.
• Led frontend development of the internal Back Office platform used by operations teams to manage games, partners,
freebets, player settings, and system configuration, including dashboards and admin workflows.
• Worked in a large TypeScript codebase with unit test coverage and containerised local environments; contributed to code
review and technical estimation.
Stack: TypeScript, React, Redux, Jest, Docker

Senior Frontend Developer 2022 – 2023
Shiji Group — Hospitality Tech; global technology provider for hotel, retail, and entertainment industries (80+ brands)
• Developed features and maintained modules within a large micro-frontend architecture used across multiple product teams.
• Maintained and extended shared internal component libraries consumed by other teams.
• Drove refactoring and stabilisation of legacy modules; delivered estimates and code reviews within established architectural
patterns.
Stack: TypeScript, React, Redux, Jest, Docker

Frontend Developer 2021 – 2022
Ciklum — Sales Tech; gamified data-visualisation platform for sales team engagement
• Developed and maintained the cross-platform mobile application (React Native + PixiJS): new features, estimation, bug
fixing, and code review.
Stack: TypeScript, React Native, PixiJS, Redux Toolkit, Jest

Frontend Developer 2021
Telesens — EdTech; web platform for schools, used by teachers to run the educational process and by parents to track student
progress

• Developed and maintained the web application: implemented new features, estimated functionality, and fixed defects.
Stack: JavaScript, React, MobX, HTML, SCSS

JavaScript Developer 2019 – 2021
Sunscript / DoneIT — Outsourcing; a variety of client projects
• Built client projects from scratch across frontend and backend, occasionally covering DevOps tasks.
• Delivered new features, estimates, bug fixes, code reviews, and refactoring on existing projects.
Stack: JavaScript, React, Next.js, React Native, HTML, CSS

Junior Full-Stack Developer 2017 – 2019
Wellnet Incorporation — Travel & Gaming; LvivQuest city-tour mobile platform with rewards, and an NDA game marketplace for
the Chinese market
• Designed and developed web and mobile applications using object-oriented languages.
• Managed time-sensitive releases, including content changes and database upgrades.
Stack: Java (Spring), Angular 7, TypeScript, Android Studio

EDUCATION

BSc, Internet of Things 2017 – 2021
Lviv Polytechnic National University

CERTIFICATIONS

• Google Cloud Platform — Core Infrastructure; Application Development; Deployment & Performance; Security (Coursera)
• AWS Fundamentals — Addressing Security Risk; Building Cloud-Native Applications (Coursera)
• React Native: Multiplatform Mobile Development (Udemy)
• Software Architecture for the Enterprise Architect (Udemy)