Iurii Senchkovskii, Developer in Philadelphia, PA, United States
Iurii is available for hire
Hire Iurii

Iurii Senchkovskii

Verified Expert  in Engineering

Front-end Developer

Philadelphia, PA, United States

Toptal member since May 22, 2024

Expertise
JavaScriptReact.jsCSSHTML5TypeScriptWeb DevelopmentFull-stackReduxNode.jsNext.jsGraphQLPostgreSQLMongoDBTailwind CSS
Bio

Iurii is a full-stack developer with over five years of commercial experience, specializing in front-end and back-end technologies. Proficient in Next.js, Node.js, SQL, and RESTful APIs, he excels in creating solutions that blend aesthetics with functionality. At DigitalVertex, Iurii improved user engagement by 23% and reduced page load times by 35%. Passionate about cutting-edge web technologies, he is committed to delivering innovative and collaborative solutions that drive business success.

Portfolio

SumerSports, LLC - Main
React, TypeScript, GraphQL, Next.js, Node.js
SFH Penn, C2C
JavaScript, TypeScript, React, Node.js, Next.js, React Query, CSS, HTML5...
SFH Digital Agency
JavaScript, React, SQL, Front-end Development, Web Development, REST APIs...

Experience

  • HTML5 - 5 years
  • React - 5 years
  • JavaScript - 5 years
  • CSS - 5 years
  • Node.js - 3 years
  • TypeScript - 3 years
  • GraphQL - 2 years
  • Next.js - 2 years

Availability

Full-time

Preferred Environment

JavaScript, React, Redux, Node.js, Next.js, GraphQL, TypeScript, PostgreSQL, MongoDB, Tailwind CSS

The most amazing...

...thing I've done is transform 3,000-line components into reusable pieces and add comprehensive documentation using Docusaurus for a more maintainable system.

Work Experience

Front-end Developer

2024 - 2025
SumerSports, LLC - Main
  • Developed responsive American football player pages from finalized designs using Material UI for a consistent interface.
  • Integrated GraphQL data retrieval with streamlined query generation via Codegen while managing state through Zustand.
  • Implemented filtering mechanisms on both client and server sides to optimize data access.
  • Set up Video.js for seamless streaming, ensuring reliable video playback.
Technologies: React, TypeScript, GraphQL, Next.js, Node.js

Full-stack Developer

2023 - 2024
SFH Penn, C2C
  • Worked on a comprehensive booking and management system for a real estate company. Contributed to an analytics and ad management system for a major retailer on Amazon. Developed a CRM system based on a data-driven approach.
  • Achieved a 35% improvement in page load time using Next.js technologies. Collaborated with internal teams, including graphic designers and QA testers, to develop and launch a new application in just six months, two months ahead of schedule.
  • Contributed to an analytics and ad management system for a major retailer on Amazon. Integrated ad management tools, reducing non-targeted budget spending by 28%.
  • Developed a data-driven CRM system. Developed an authorization system using JSON Web Tokens (JWTs). Implemented a client-server permissions system, enhancing security and access control.
Technologies: JavaScript, TypeScript, React, Node.js, Next.js, React Query, CSS, HTML5, GraphQL, SQL, MongoDB, Full-stack Development, Front-end Development, MongoDB Atlas

Software Engineer

2018 - 2022
SFH Digital Agency
  • Implemented an automated internal control system for accounting, using banking APIs to double efficiency and cut reconciliation errors by 75%.
  • Developed an automated ad platform reporting system, which saved 2.5 hours daily and enhanced productivity by 40% and accuracy by 85%.
  • Boosted average end-user engagement with target actions by 25% through a content substitution feature in client applications. Utilized ARIA and adaptive design principles to improve accessibility and user experience.
  • Directed front-end optimization efforts, incorporating critical render path analysis, front-end performance optimization, and progressive enhancement to achieve a 25% improvement in page load times and a 30% enhancement in SEO rankings.
  • Partnered with UX designers, using analytics and A/B tests to enhance user engagement by 23%, focusing on iterative design and user-focused interfaces.
  • Championed the use of RESTful APIs, micro-frontends, and mono repositories in project architectures, streamlining the development process and improving application scalability.
Technologies: JavaScript, React, SQL, Front-end Development, Web Development, REST APIs, Full-stack, Full-stack Development, TypeScript, HTML5, CSS, Figma

Experience

Reactillo

https://reactilloapp.netlify.app/
A simplified apartment rental platform. It allows users to register and sign in, choose between regular user and realtor roles, and perform various actions based on their roles. Visit reactillo-docs.netlify.app for the project documentation.

React Online Code Editor

An online code editor that I developed with React, Redux, TypeScript, and the Monaco Editor. The web app provides a robust environment for developers to write, format, and preview code snippets in real time.

Hotel Management App

https://github.com/YuriySenchkovskiy/hotel-management-app
This app is designed for hotel employees to perform tasks efficiently, providing a seamless interface for managing bookings, cabins, and guest services. Crafted with care, this app integrates a user-friendly dashboard and robust back-end functionality, ensuring hotel operations run smoothly.

Next.js Demo project

https://next-hotel-managment-system-demo.vercel.app/
A hotel reservation system that I designed to provide a seamless booking experience for guests looking to stay at the hotel. The application caters to both potential and actual guests, offering comprehensive information and functionality to manage their reservations efficiently.

Technology stack/Framework
• Next.js, the most popular React meta-framework, handling routing, SSR, data fetching, and even remote state management.
• UI state management
• The Context API is used to manage the global UI state within the Next.js application. Alternatives like Redux can be used, but the Context API will suffice for this project.
• Database/API
• Supabase: This is used for data storage and API services. We will use the data and API built in the first "Wild Oasis" project.
• Styling
• Tailwind CSS is a modern way of writing CSS that is extremely easy to integrate into Next.js. This project will pre-write most styles and markup.

User authentication
• Guests need to sign up and log in before they can reserve a cabin and perform any operations.
• On sign-up, each guest gets a profile in the database.
• Guests can set and update basic data about their profile to make check-in at the hotel faster.

Skills

Libraries/APIs

React, React Query, React Router, Node.js, REST APIs

Tools

MongoDB Atlas, Figma

Languages

JavaScript, TypeScript, CSS, HTML5, GraphQL, SQL

Frameworks

Redux, Next.js, Tailwind CSS, Bootstrap, OAuth 2

Storage

PostgreSQL, MongoDB

Other

GitHub Actions, Web Development, Full-stack Development, Front-end Development, Supabase, Full-stack

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring