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Senior Full Stack Engineer focused on scalable React/Next.js and Node.js backend systems, delivering AI-powered products with strong emphasis on performance optimization, accessibility, clean code, and modern web security. Works across multi-tenant, high-load platforms integrating REST APIs and data layers for reliable, user-centric experiences. Builds reusable UI architecture and state/data fetching patterns across complex product areas (real-time updates, multi-step interactions, and payment flows). Experienced in end-to-end delivery including REST API design, PostgreSQL/Prisma integration, containerization, and Playwright E2E testing to improve release confidence across environments.…Senior Full Stack Engineer focused on scalable React/Next.js and Node.js backend systems, delivering AI-powered products with strong emphasis on performance optimization, accessibility, clean code, and modern web security. Works across multi-tenant, high-load platforms integrating REST APIs and data layers for reliable, user-centric experiences. Builds reusable UI architecture and state/data fetching patterns across complex product areas (real-time updates, multi-step interactions, and payment flows). Experienced in end-to-end delivery including REST API design, PostgreSQL/Prisma integration, containerization, and Playwright E2E testing to improve release confidence across environments.

E. Karthashian

Full Stack Developer, Front-End Developer, Web Developer, +2

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Senior Full Stack Engineer focused on scalable React/Next.js and Node.js backend systems, delivering AI-powered products with strong emphasis on performance optimization, accessibility, clean code, and modern web security. Works across multi-tenant, high-load platforms integrating REST APIs and data layers for reliable, user-centric experiences. Builds reusable UI architecture and state/data fetching patterns across complex product areas (real-time updates, multi-step interactions, and payment flows). Experienced in end-to-end delivery including REST API design, PostgreSQL/Prisma integration, containerization, and Playwright E2E testing to improve release confidence across environments.…Senior Full Stack Engineer focused on scalable React/Next.js and Node.js backend systems, delivering AI-powered products with strong emphasis on performance optimization, accessibility, clean code, and modern web security. Works across multi-tenant, high-load platforms integrating REST APIs and data layers for reliable, user-centric experiences. Builds reusable UI architecture and state/data fetching patterns across complex product areas (real-time updates, multi-step interactions, and payment flows). Experienced in end-to-end delivery including REST API design, PostgreSQL/Prisma integration, containerization, and Playwright E2E testing to improve release confidence across environments.

Available to hire

Senior Full Stack Engineer focused on scalable React/Next.js and Node.js backend systems, delivering AI-powered products with strong emphasis on performance optimization, accessibility, clean code, and modern web security. Works across multi-tenant, high-load platforms integrating REST APIs and data layers for reliable, user-centric experiences.

Builds reusable UI architecture and state/data fetching patterns across complex product areas (real-time updates, multi-step interactions, and payment flows). Experienced in end-to-end delivery including REST API design, PostgreSQL/Prisma integration, containerization, and Playwright E2E testing to improve release confidence across environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Spanish; Castilian

Advanced

Ukrainian

Fluent

Russian

Fluent

Work Experience

Frontend Engineer (React/TS) at Jest

May 1, 2026 - Present

Optimized state management and REST API data-fetching logic to improve responsiveness in high-frequency real-time update flows. Built reusable UI systems for multi-brand, multi-tenant platforms to improve consistency and reduce duplicated logic. Improved reliability of critical user flows (registration, payments) via robust validation, loading, and error-handling patterns.

Senior Frontend Engineer (React/Next.js/TS) at C H I Software Builts scalable frontend systems and complex state-driven interfaces for enterprise and AI-powered web applications.

February 1, 2026 - Present

Focused on performance optimization, reusable UI architecture, and maintainable frontend systems in multi-tenant environments. Worked across AI products, analytics platforms, and internal tools with strong focus on UX quality and scalability. Collaborated closely with backend engineers to design API contracts, integrate backend services, and deliver scalable user-centric product experiences.

Senior Frontend Engineer (React/TS) at G8T Tech

January 1, 2026 - May 1, 2026

Built high-load frontend modules for player accounts and payment flows, handling real-time updates and complex multi-step interactions.

Frontend Engineer (React/Next.js/TS) at G R 8 T e ch (Docker/JavaScript/Next.js context: full stack team mention)

May 1, 2025 - November 1, 2025

Built dashboard and workspace modules for enterprise-grade multi-tenant platforms using React, Next.js, and TypeScript. Implemented scalable frontend data layers integrating REST APIs with Tan Stack Query, improving rendering stability, caching, and UI responsiveness. Built reusable design-system-aligned UI components to improve UX consistency and reduce duplicated frontend logic. Introduced Playwright E2E testing workflows to reduce regressions and improve release confidence across environments. (Marketing/CRM and app systems described elsewhere in the resume.)

Frontend Engineer (React/Next.js/TS) at AppGang

November 1, 2020 - February 1, 2025

Led migration of a legacy jQuery-based CRM to a scalable React + Zustand architecture, improving maintainability and frontend consistency. Built complex forms, dashboards, and operational workflow UIs for high-frequency internal business usage. Introduced Playwright E2E testing for critical user journeys to improve release stability and reduce regressions.