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YAROSLAV PLAKSII
Frontend Developer
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Ternopil, Ukraine

SUMMARY

Frontend Developer with 4+ years of experience building production applications with React and TypeScript. Comfortable both starting
projects from scratch and taking ownership of existing ones — improving their architecture, tooling and delivery process along the way.

TECH SKILLS

Languages: JavaScript, TypeScript
Frameworks: React, Next.js
State Management: Redux, Zustand, TanStack Query
API/Data: REST API, GraphQL, WebSocket
Styling: CSS, SASS, Tailwind, MUI, Mantine, Shadcn UI
Backend: Node.js, Express
Version Control: Git, GitHub, GitLab, Azure DevOps
Testing: Jest, React Testing Library, Storybook
DevOps/Infra: Docker, CI/CD, Vercel, AWS (S3, CloudWatch), Datadog
Focus Areas: Accessibility (WCAG), i18n, Responsive/Adaptive Design, Performance Optimization

EXPERIENCE

ein-des-ein Feb 2026 – Aug 2026
Frontend Developer
Supplier OS (Bloomwell / Algea Care) | Feb 2026 – Aug 2026
● Built an internal B2B platform from scratch for managing suppliers, partners, pharmacies and the product portfolio in medical cannabis
distribution across DE/GB markets — shaping its frontend architecture and driving the choice of core technologies.
● Set up and maintained a shared library of reusable UI components, cutting duplicate work and keeping the UI consistent as the app
grew.
● Designed and implemented role- and permission-based access control across the app.
● Created analytics dashboards showing product and pharmacy performance, with date filtering and CSV export.
Stack: React, TypeScript, React Hook Form, Yup, Zustand, Tailwind, TanStack Query, Shadcn UI, i18next

CHI Software Sep 2023 – Present
Frontend Developer
Caterpillar Dealer Network — Multi-brand Web Platform | Sep 2025 – Present (part-time from Mar 2026)
● Built and maintain a single codebase powering 5 separately branded dealer sites across different countries, each served on its own
domain and independently managed by its own team through a headless CMS.
● Led the migration of the application to Next.js's modern architecture and upgraded to the latest Next.js/React versions, improving site
performance and long-term maintainability.
● Strengthened the site's security policies to protect against common web attacks, while still supporting trusted third-party embeds like
analytics and video players.
● Took over a broken, half-finished Storybook setup, fixed it end-to-end and got it into production use as the team's component
reference.
● Reworked the localization setup, which existed but was barely used, into a working system covering all 5 sites and their locales.
● Built the product catalog, filtering, lead-generation forms and mega menu, shared across all 5 sites but configurable per brand.
● Integrated Algolia-powered search, a Google Maps store locator and Google Analytics into the site.
● Redesigned the team's release process — cleaner Git branching, staged rollouts from staging to production, and a more reliable CI
pipeline.
Stack: Next.js 16, React 19, TypeScript, Tailwind CSS, Contentful, Algolia, Google Maps API, React Hook Form, Storybook, Vercel, GitHub Actions
AI Agents Platform | May 2025 – Aug 2025
● Sole frontend developer on the project — built the entire interface from scratch and owned all frontend decisions, from architecture to
delivery.
● Built interfaces for configuring, monitoring and debugging AI agents, with live status, logs and inter-agent communication views.
● Designed the agent configuration UI to be extensible across different agent types, avoiding UI rework whenever a new agent type was
added.
● Worked closely with AI engineers to translate complex agent behaviors and orchestration logic into a clear, transparent interface for end
users.
Stack: Next.js, TypeScript, Shadcn UI, Tailwind CSS, WebSockets, REST API
 Aviation In-Flight WiFi Portal | Dec 2024 – May 2025
● Built an in-flight WiFi portal for airline passengers, together with an admin panel where airline staff could assemble and configure the
portal's content themselves.
● Implemented the admin-side page builder, letting non-technical staff compose passenger-facing pages without involving engineering.
● Kept the passenger-facing portal lightweight and fast under in-flight network conditions by scoping data requests tightly and lazy-loading
non-critical content.
● Owned the publishing and review process for the team, making sure changes reached production predictably and without regressions.
Stack: React, TypeScript, Zustand, MUI, GraphQL, REST API, Webiny
Fintech Risk & Loan Platform | Jul 2024 – Nov 2024
● Extended the interactive rule-builder UI that lets risk managers configure eligibility rules visually without writing code.
● Wired custom rule-based risk assessment algorithms into the interface, automating loan eligibility decisions for loan officers and risk
managers.
● Added validation and an audit trail to the eligibility workflow, so every automated risk decision could be traced and reviewed.
● Drove code quality through regular reviews, helping the team ship risk-scoring features reliably on a biweekly release cycle.
Stack: Next.js, TypeScript, Redux, MUI, React Flow, REST API
Algorithmic Trading Platform | Sep 2023 – Jul 2024
● Built the interface for a platform where traders analyze financial instruments and run algorithmic trading strategies.
● Created a visual strategy editor, letting traders compose and test algorithmic trading strategies without writing code.
● Optimized the interface for large incoming datasets — modals, charts and long lists that previously froze on open now render smoothly.
Stack: React, TypeScript, Zustand, Mantine, React Flow, REST API

SoftRyzen Sep 2022 – Jul 2023
Frontend Developer
● Delivered landing pages and marketing websites for a range of clients end-to-end, from design handoff through deployment, working
directly with designers and clients on revisions.
● Worked across a range of stacks depending on client needs — from template-based builds to React/Next.js — quickly ramping up on
new codebases and tooling under tight turnaround times.
● Handled client revision requests directly, translating feedback into scoped changes without back-and-forth through a project manager.
Stack: HTML, CSS, SASS, Tailwind, JavaScript, jQuery, React, Next.js, Handlebars

EDUCATION

Master's Degree in Finance
Ternopil National Economic University

LANGUAGES & SOFT SKILLS

Languages: English — Upper-Intermediate; Ukrainian — Native
Soft skills: Time management, Communication, Teamwork, Work ethic, Attention to detail