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Ivan Chaus

Current — YachtWay, Miami, USA — remote

Ivan Chaus

Frontend Lead / Architect

Seven years building production web applications in React, Next.js and TypeScript — currently at YachtWay, where a performance overhaul cut page latency in half across the marketplace. Before that, five years directing frontend architecture and delivery for ten-plus client platforms.

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Readout

Four figures, each traceable to a line in a CV.

Years in production
07

Shipping web applications professionally since July 2019.

Page latency cut
50%

Marketplace-wide at YachtWay, via SSR and image-pipeline work.

Built from scratch
10+

Client applications architected and delivered at Beleven.

Customers served
50K+

Active subscribers on the Candylink VPN subscription platform.

Practice

The work is architecture more than it is components. Deciding how a frontend is shaped — rendering strategy, state boundaries, where the design system stops and the product starts — and then making that decision survive contact with a team, a deadline, and a codebase somebody else wrote.

Most of it has been greenfield: ten-plus client applications taken from an empty repository to production, across telehealth, crypto, real-time analytics and consumer subscriptions. The domains differ and the constraints rhyme. Something has to be fast, something has to be auditable, and someone has to be able to change it in eighteen months.

The specialisms follow from that. Performance, because latency is the one requirement every stakeholder agrees on once they have seen the number. Security-sensitive delivery — HIPAA, BankID, dynamic 2FA, digital signatures — because those are the projects where a vague architecture becomes expensive. And design systems, because the alternative is rebuilding the same button in four repositories.

Focus
Frontend architecture, performance, design systems
Rendering
Next.js App Router and Pages Router, SSR, static
Domains
Telehealth, Web3, analytics, marketplaces
Based
Pardubice, Czech Republic — CET, remote

Engagements

Lamina Clinic

Telehealth platform

  • Built a HIPAA-compliant platform handling encrypted real-time WebRTC video consultations.
  • Integrated BankID identity verification, dynamic 2FA and digital signature workflows.
  • React
  • TypeScript
  • WebRTC
  • BankID
  • HIPAA

PEAKDEFI

Crypto launchpad

  • Developed launchpad and promotion platforms processing multi-million dollar smart contract volume across EVM networks.
  • Built fail-safe wallet connector states and transaction status UI that reduced drop-off mid-transaction.
  • TypeScript
  • React
  • Web3.js
  • EVM

Influencers

Real-time analytics

  • Built a real-time analytics portal for talent managers with high-throughput tracking dashboards.
  • Implemented OAuth2/OIDC identity management with Keycloak, and optimised data fetching with React Query.
  • TypeScript
  • React
  • React Query
  • Chakra UI
  • Keycloak

Candylink VPN

Subscription platform

  • Refactored a monolithic legacy system into clean API contracts between Angular and Django services.
  • Implemented a custom multi-tier subscription system serving over 50,000 active customers worldwide.
  • Angular
  • TypeScript
  • Django
  • REST

Track record

  1. to Present

    Front-end Engineer · YachtWay

    Miami, USA — remote

    • Led a web performance overhaul that cut page latency by 50% and lifted Core Web Vitals to passing across the marketplace, via SSR optimisation and image pipeline tuning.
    • Built modular, reusable component libraries that standardised the design system and cut duplicated UI work across teams.
    • Set up frontend architecture for multiple sub-services, owning features end to end from technical design to production release.
    • Introduced AI-assisted workflows and automated code-consistency checks used by the distributed team.

  2. to

    Front-end Lead · Beleven

    Lviv, Ukraine

    • Directed frontend architecture and delivery for 10+ client applications built from scratch with React, Next.js and TypeScript.
    • Standardised responsive UI and component architecture across projects using Tailwind CSS, MUI, Chakra UI and SASS.
    • Led refactoring of legacy React codebases to modern state management and rendering patterns.
    • Delivered security-sensitive builds: HIPAA-compliant telehealth, WebRTC video calling, BankID and dynamic 2FA authentication, and digital signature workflows.

  3. to

    Full Stack Engineer · Beleven

    Lviv, Ukraine

    • Built full-stack features for client projects using React, Express.js, Django and Firebase real-time databases.
    • Developed interfaces with centralised state management and custom design tokens for high-traffic applications.
    • Integrated smart contract interaction layers using Web3 libraries and TypeScript.

Capabilities

Languages
TypeScript · JavaScript · Python · C++ · C#
Frontend
React · Next.js · Angular
State & data
Redux · RTK · Zustand · TanStack Query · SWR · Axios
Backend & API
Node.js · Express.js · Django · REST · Firebase
Styling & UI
Tailwind CSS · SASS · MUI · Chakra UI · Styled Components · Storybook
Tools
Git · Docker · AWS · Linux · Jest · Figma · Web3.js · WebRTC · Keycloak · OAuth2
AI tooling
Claude Code · Cursor · GitHub Copilot · MCP servers · Spec-driven development
Spoken
English — C1 · Ukrainian — native

Education

to

Master's Degree, Software Engineering

Lviv Polytechnic National University · Lviv, Ukraine

with Honors
to

Bachelor's Degree, Software Engineering

Lviv Polytechnic National University · Lviv, Ukraine

with Honors

Contact

Email is the one that gets read.

Email
[email protected]
LinkedIn
in/ivan-chaus(opens in a new tab)
GitHub
Ivan-Chaos(opens in a new tab)
Location
Pardubice, Czech Republic — CET
Start a conversation

Everything on this page traces to a CV. Happy to send the full document, or the long version of any of it.