Ігор

Ihor Cherniaiev
Senior / Lead Frontend Engineer

Kyiv, Ukraine | [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)

PROFESSIONAL SUMMARY

Senior / Lead Frontend Engineer with 7+ years of experience building production web and mobile apps with React,
Next.js, TypeScript, and React Native. Built frontends from scratch for 2 AI-powered B2B products: a security
platform serving 3 enterprise clients and a wealth-management platform (web + iOS) serving 7, with an iOS app
shipped in 2 months. Migrated ~15 NestJS microservices into a single Next.js app, cutting infrastructure costs by
70%. Led frontend teams of 3 and built an internship program that trained 10+ engineers, 5 hired full-time.

TECHNICAL SKILLS

Languages & Frameworks: TypeScript, JavaScript, React, Next.js, Vue.js, Angular, Gatsby.js, HTML, CSS/SCSS
State & Data: TanStack Query, Zustand, Redux (RTK Query), MobX, Recoil, NgRx, RxJS
UI & Styling: Tailwind CSS, shadcn/ui, Ant Design, Material UI, Mantine UI, Storybook
Mobile: React Native, Expo, Capacitor, Xcode Cloud, Fastlane, Bitrise
Backend & APIs: Node.js, NestJS, Express, Supabase, Auth0, REST, GraphQL, WebSocket, Protobuf, SQL, NoSQL
Testing: Jest, Vitest, React Testing Library, Playwright, Cypress
Build & DevOps: Vite, Webpack, Nx, GitHub Actions, AWS (S3, CloudFront, Cognito), Firebase, Docker, Terraform
AI Tools: Cursor, Claude Code, GitHub Copilot, Lovable

PROFESSIONAL EXPERIENCE

DevArmor | Senior Frontend Engineer | Dec 2024 - Oct 2026 | Contract, Part-time
AI-powered application security platform for automated threat modeling and security reviews.
● Built the platform’s frontend from scratch to production, owning architecture and technical decisions and
authoring ~85% of the frontend codebase; the platform serves 3 enterprise clients.
● Developed the core threat modeling workflow end to end: versioned threat models and interactive
Mermaid/GraphViz architecture diagrams with a live code editor.
● Shipped AI-driven features: AI-generated threat models, AI Guardrails, versioned Organizational Memory
used as AI context, and AI rule-file generation for coding assistants.
● Built a reusable optimistic-update layer on TanStack Query covering all entities (cache sync, rollback,
invalidation), so every edit is reflected instantly without waiting for the backend.
● Set up CI/CD from scratch with GitHub Actions: PR quality gates (lint, tests, build), automated deployments
to AWS S3/CloudFront across dev, staging, and prod, and AI-powered PR review with Claude.
● Led major upgrades (React 18 → 19, Ant Design 5 → 6, Tailwind CSS 3 → 4, React Router 7 → 8, Vite 6 → 8)
and fixed 30+ known security vulnerabilities in dependencies.
● Conducted ~10 technical interviews and drove code reviews and technical planning.
Technologies: React, TypeScript, Vite, Vitest, TanStack Query, Zustand, Ant Design, Tailwind CSS, TipTap, Mermaid,
CodeMirror, GitHub Actions, AWS, Sentry, Terraform.

Intellebox.ai | Lead Frontend & Mobile Engineer | Feb 2024 - Sep 2026 | Contract, Part-time
AI-powered relationship intelligence platform for wealth management.
● Owned frontend and mobile end to end (architecture, planning, estimation) for a platform serving 7
enterprise clients; rebuilt the web app from scratch with Next.js.
● Single-handedly shipped a React Native iOS app to the App Store in 2 months; 100+ active users.
● Delivered the migration from ~15 NestJS microservices and 2 role-based frontends (investor, admin) to a
single Next.js + Supabase codebase in 3 months, cutting infrastructure costs by 70%.
● Shipped one Capacitor codebase for web + iOS (App Store), with push notifications and Xcode Cloud CI/CD.
● Built AI features on web and mobile: AI agent chats with streaming responses, Ask AI, AI meeting transcripts,
and AI agent management with knowledge bases.
Technologies: React, Next.js, TypeScript, React Native, Capacitor, TanStack Query, Zustand, shadcn/ui, Tailwind
CSS, Auth0, Xcode Cloud, Firebase, Supabase.

IT Craft | Lead Frontend Engineer | Apr 2021 - Jan 2024 | Full-time
● Progressed from Middle to Lead Frontend Engineer, owning frontend architecture and delivery for
healthcare, staffing, fintech, and enterprise projects.
● Led frontend teams of 3 engineers on 2 projects: set technical direction, ran code reviews, estimated scope
during presales, and conducted technical interviews.
● Designed and ran a 4-month frontend internship program: trained 10+ interns, 5 hired full-time.
● Reduced message loss by 80% in an enterprise Angular/Openfire messenger by fixing connection instability.
● Raised Lighthouse Performance from ~45 to 85 and cut LCP from 6s to 2s on a 100+ page Gatsby website,
keeping SEO above 90, through image, CSS, GraphQL query, and code optimization.

IT Craft | Middle Frontend Engineer | Feb 2020 - Apr 2021 | Full-time
● Built frontend features across industries with React, React Native, Vue.js, Angular, and TypeScript.
● Mentored junior developers and presented technical demos to clients.

Skilarium | Full Stack Engineer | Aug 2019 - Feb 2020 | Full-time
● Developed a healthcare web app with React and TypeScript on the frontend and NestJS backend APIs.
● Wrote unit and end-to-end tests to improve application reliability and prevent regressions.

EDUCATION & TRAINING

State University of Trade and Economics | M.S., Computer Science | 2023 - 2025
V. N. Karazin Kharkiv National University | B.S., Computer Science | 2016 - 2020
EPAM | Full Stack JavaScript Internship | 2019

LANGUAGES

English (C1) | Ukrainian (Native)