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Yulia Pelypenko
Full-Stack Developer — TypeScript, React, NestJS, Express

📍 Dnipro, Ukraine | Remote
📧 [open contact info](look above in the "contact info" section)
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💬 Telegram
| SUMMARY Technical Proficiencies
I specialize in web application LANGUAGES
development using React, JavaScript, TypeScript
Express/NestJS.
CLIENT-SIDE
I also have hands-on experience React, Redux, Redux Toolkit, Redux Thunk, RTK Query
integrating AI technologies to
enhance user experiences, optimize SERVER-SIDE
workflows, and build intelligent Node.js, Express, NestJS
features into modern applications.
DATABASES
I am committed to writing clean, PostgreSQL, MongoDB, Mongoose, TypeORM
maintainable code and finding
effective solutions to business USER INTERFACE
problems. HTML, CSS, SASS/SCSS, Ant Design, Material UI

TESTING LIBRARIES
| AREAS OF EXPERTISE
Jest, Vitest
Designing and implementing web and
mobile software solutions AI
OpenAI (GPT-4, Assistants API)
Developing web services, REST APIs,
GraphQL, and client-side applications CONTAINERIZATION & CI
Docker, GitHub Actions
Providing support and maintenance
for software products after release

Employment History

| EDUCATION SysGears (August 2024- July 2025)
JavaScript & TypeScript Software Engineer
National Technical University
-​ Expanded domain expertise beyond healthcare by contributing to projects in
"Dnipro Polytechnic" e-commerce, AI, and other industries
Speciality: Mechanical Engineering -​ Translated business requirements into efficient, scalable software solutions
-​ Designed and developed client-side applications using React
Degree Masrer’s
-​ Developed and maintained server-side APIs using Node.js, NestJS, and
Express
-​ Contributed to AI-based features such as chatbots, automated email
responders, and voice call processing tools
| CERTIFICATIONS -​ Collaborated directly with stakeholders and cross-functional teams to ensure
smooth project delivery
-​ Continuously improved code quality through peer reviews and by following
best development practices

Notable Projects

| Upwork Automation Tool
Description
An internal tool developed to support the sales department by automating key parts of the lead generation
process. The platform allows team members to generate personalized AI-powered cover letters for job
applications and automatically receive curated Upwork job posts based on customizable filters. The system is
integrated with both OpenAI and Upwork APIs and designed to optimize performance and reduce manual
workload for lead generation managers.

The solution is divided into two main functional areas:

●​ Cover Letter Generator – enables users to create high-quality, personalized cover letters in minutes
using predefined templates and AI-generated content, all within a structured React-based form.​
 ●​ Upwork Job Feed Automation – delivers relevant job posts 24/7 based on saved filters, increasing the
chances of fast response and higher reply rates.​

The system is designed to be used internally by sales team members and supports performance tracking and
optimization based on real metrics like average letter creation time and reply rates.

Responsibilities
-​ Developed the frontend of the application using React, React Query, Zod, and React Hook Form with Ant
Design for UI
-​ Implemented the backend with NestJS and PostgreSQL, handling API integrations, authentication, and
business logic
-​ Designed and implemented the OpenAI API integration to support assistant-based letter generation,
including assistant selection and prompt management
-​ Integrated with Upwork API to fetch and filter relevant job posts
-​ Created flexible filtering and configuration options per user
-​ Collaborated with stakeholders to align features with actual sales workflow and capacity goals
-​ Ensured proper validation, state management, and error handling across the form and job feed
components​

Tools & Technology Stack

React, RTK Query, React Hook Form, Zod, NestJS, TypeORM, PostgreSQL, Ant Design, OpenAI API, Docker

| Weather forecasting app
(the name is under NDA)

Description
An application for tracking the weather in different cities. A user can add up to 10 cards with current weather and
forecast, including a card for the current location. There’s a web application with responsive design which allows
users to learn the weather forecast in any convenient way.

Responsibilities
-​ Developing the project from scratch based on high-level requirements
-​ Designing modular architecture
-​ Implementing backend and web and mobile clients
-​ Enabling user authentication and authorization
-​ Integrating third-party APIs for getting weather forecasts and location data
-​ Implementing caching to ensure fast application response

Technology Stack
TypeScript, React, Redux Tool KIt, RTK Query, MaterialUi, React Hook Form, Yup, NestJS, TypeORM,
PostgreSQL, Docker
| NAVBB
(the name is under NDA)

Description
NAVBB is a web application used by a network of veterinary clinics to manage the process of collecting animal
blood and tracking its subsequent sale on Amazon. The application is built with a modern tech stack and
supports features such as donation tracking, appointment scheduling, user management, and reporting. It
includes dashboards for medical staff, logistics teams, and administrators.

Responsibilities
-​ Migrating the project from CRA (Create React App) to Vite for improved build speed and maintainability
-​ Updating outdated dependencies and resolving compatibility issues
-​ Fixing bugs in legacy code and implementing improvements
-​ Developing new features based on client requirements
-​ Writing unit tests for critical and previously unstable areas of the application

Tools & Technology Stack
React, TypeScript, Vite, NestJS, GraphQL, Apollo GraphQL, PostgreSQL, React Hook Form, Ant Design, Vitest,
React Testing Library, Docker