Олена

Olena Herych
Fullstack Developer

SUMMARY
Fullstack Developer with 1 year of commercial experience working on
production web applications and AI-powered systems. Experienced with
TypeScript, React, Next.js, Node.js, PostgreSQL, REST APIs,
authentication, and third-party integrations. I focus on clean, maintainable
code, reliable solutions, and a good user experience. I enjoy learning new
technologies, solving practical technical problems, and using AI tools to
make development more efficient without compromising code quality.

CONTACT: EXPERIENCE:
[відкрити контакти](див. вище в блоці «контактна інформація») FULLSTACK DEVELOPER | APPEXOFT Apr 2026 - present
Stack: TypeScript · Node.js · Hono · Next.js · React · Prisma · PostgreSQL · pgvector ·
[відкрити контакти](див. вище в блоці «контактна інформація») Redis · BullMQ · LangChain · LangGraph · LiteLLM · Docker · MCP · Composio · Stripe ·
Playwright · Vitest · AI Tools
LinkedIn AI-powered multi-tenant SaaS platform with agentic AI workers
Telegram that automate structured business tasks across chat, email,
WhatsApp, voice, and Slack.
GitHub Developed and maintained fullstack features across a production
platform using Hono, Node.js, BullMQ, Next.js, and React
Lviv, Ukraine Built permissions and approval flows with reusable permission
gates, consent cards, and persistent user decisions
SKILLS: Implemented integrations with external channels and services,
including email threading, WhatsApp, MCP, Composio, and Nango
Programming Languages: Built AI agent memory features with shared organization memory
and private per-agent memory using asynchronous queues
JavaScript · TypeScript · SQL
Developed onboarding workflows including company research, AI-
(PostgreSQL) driven interviews, and company data processing
Improved production reliability by handling LLM errors, database
Frontend: React · Next.js · Redux race conditions, retries, and multi-tenant data isolation
Built automated testing with Vitest and Playwright, including
Toolkit · React Query · Zustand ·
permission, scenario, and end-to-end tests
Tailwind CSS · HTML5 · CSS3 Collaborated in an Agile team on a live production codebase with
regular releases
Backend & Data: Node.js ·
FRONTEND DEVELOPER | WWG Sep 2025 - Mar 2026
Express.js · MongoDB · Mongoose Stack: React · Next.js · TypeScript · Supabase · PostgreSQL · Jira API · AWS · AI
Tools
· Supabase · PostgreSQL · REST
Internal operations platform: employee profiles, work hours, Jira
API · JWT · Authentication metrics, project tracking, management reporting.
Developed and maintained frontend features for a production
Integrations & Cloud: Jira API · AWS employee tracking application
(integration experience) · NextAuth.js Built UI for employee profiles, worked hours, Jira metrics, and
project status views
Architecture & UX: SPA · SSR · SSG · Integrated Supabase data flows and external services (Jira API,
AWS)
App Router · Feature-Sliced Design
Used AI tools to accelerate development workflows
Tools & DevOps: Git · GitHub · Collaborated in an Agile team on a live codebase with real business
requirements
Postman · Vercel · Vite · npm · Render

PORTFOLIO:
Community App | GitHub | Live
EDUCATION: React · TypeScript · Redux Toolkit · Node.js · Express.js · MongoDB
Full-stack social platform where users create posts, comment on
IT SCHOOL GOIT 2025 discussions, and interact with community content.
Fullstack Developer
Implemented scalable global state management using Redux
LVIV STATE UNIVERSITY OF Toolkit
LIFE SAFETY 2021 - Built asynchronous data flows with createAsyncThunk
Developed complete CRUD functionality for posts and
Bachelor's Psychology 2025
comments
Integrated RESTful API using Express.js and MongoDB
Structured the frontend using feature-based architecture
Implemented loading, error handling, and optimistic UI updates
LANGUAGE:
Deployed frontend and backend to production
English - Intermediate Workspace App | GitHub | Live
Ukrainian - Native Next.js · TypeScript · NextAuth.js · MongoDB · Tailwind CSS · App
Router
Collaborative workspace management platform with secure
authentication, team collaboration, and protected user
dashboards.
Built a production-ready application using Next.js App Router
and TypeScript
Implemented secure authentication and session
management with NextAuth.js
Developed protected routes and middleware-based access
control
Designed scalable layouts with nested routing architecture
Integrated MongoDB for persistent data storage
Optimized server-side rendering and application performance
Deployed the application to Vercel

Leleka | Frontend | Backend | Live
Next.js · TypeScript · React Query · Zustand · Tailwind · Node.js ·
MongoDB

Role: Fullstack Developer · Team project

Full-stack pregnancy tracking application with personalized
dashboards, diary management, and onboarding flows.

Developed multi-step onboarding and personalized
dashboard experiences
Built reusable diary management system with full CRUD
operations
Implemented global state management using Zustand
Integrated server-state synchronization with React Query
Designed RESTful API endpoints and MongoDB schemas
Applied scalable component architecture and modern UX
practices