Freelancer Kostiantyn Ostapenko (javascript and Typescript) ≡ FyzeR

Freelancers

Information Portfolio 10 Reviews 5 Activity

Kostiantyn Ostapenko
Vinnytsia, Ukraine
5 0
Available for hire

Projects 5
Rating -
Rating 885

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Last project: 1 year back
Collaboration with clients: 5
Last visit: 7 days 9 hours ago

Built 10+ production applications for clients across the USA, Europe, and Asia
Contributed as a feature owner to a large-scale migration project (90k+ users) from Bubble to Supabase, including:
— user-by-user migration flow during registration
— migration of 2.2TB of storage
— migration of 70GB of database data
Developed a corporate budgeting system for MHP Logistics (transport division of a major agribusiness holding)
Solo developer on a national hackathon team — 2nd place

web developer flexbox MobX Ajax/Fetch/Axios React/TypeScript reactjs javascript redux

Programming

Javascript and Typescript 11 USD for hour
Databases & SQL 11 USD for hour
Web Programming 11 USD for hour

560 USD

0 124

Light 2U

Web Programming

Light 2U - a company catalog website that deals with the sale and production of lighting fixtures. The site is fully ready and is currently being filled with content. In terms of technical aspects, it has: a catalog with a two-level category system,…

0 169

Charm AI

Javascript and Typescript

Charm AI - online Dating Assistant service. With its help, you can generate responses for messaging, ask for advice from AI, and also generate first messages (openers) for chat.

224 USD

0 156

Fabriq

Javascript and Typescript

A modern multilingual website developed for a company specializing in the creation and implementation of statues. The interface supports three languages (Polish, English, German), providing a convenient experience for a wide audience. The project…

671 USD

0 111

Lumineka

Web Programming

Lumineka is a Ukrainian company that specializes in the production of lamps and accessories for them. The website has a catalog with convenient filters and an admin panel for content management.

94 USD

1 157

Ulethai

Web Programming

Ulethai is a Thai company that provides car rental services. The website includes filters, car search, booking, and much more.

0 208

IQ Logic

Javascript and Typescript

IQ Logic - Fullstack Web Application for IQ testing. Its functionality includes: authorization, account generation, test, IQ calculation, paid subscription, online payment, paid trial period, and much more.

0 143

Img2code

Web Programming

Img2code - a full-fledged Fullstack Web application. It is used for photo conversions, has accounts, subscriptions, credits, light and dark themes, browser fingerprint verification, live code snippets, and much more! #web-programming #TailwindCSS #…

1 151

Next Movie

Web Programming

Next Movie - Fullstack cinema website. It has accounts, admin panel, movies, search, booking, viewing history, online payment, and many more cool features! #Next.js #React/TypeScript #tailwindcss #TypeScript #react/next #React-development

0 200

Weather Guru

Javascript and Typescript

Weather Guru - an online service for viewing the weather. It has a built-in search between cities. #React/TypeScript #Styled-components #Axios

0 316

Justy News

Javascript and Typescript

Justy News - an online portal for fresh news. There are light and dark themes, filtering, pagination, navigation, search, and much more! #React/TypeScript #typescipt #SASS(SCSS) #redux-toolkit #redux

Simple landing page

Personal 56 USD

I contacted the performer with a task and was pleasantly surprised by the quality of work and speed of execution. The order was completed ahead of the agreed deadlines, which was a pleasant bonus. I especially want to note the excellent and prompt communication — always available, responds quickly to edits and suggestions. I am fully satisfied with the work, I recommend collaborating!

5.0

Kostiantyn Ostapenko

8 May 2025

5.0

Professionalism

5.0

Quality

5.0

Price

5.0

Contactability

5.0

Deadlines

Latest proposals 10

Project	Budget	Proposal	Deadline	Added
Backend Developer (Node.js / NestJS)	1065 USD	1065 USD	1 day	31 Oct 2025
Full Stack Developer (React / Node / Next / Nest)	1065 USD	1065 USD	1 day	31 Oct 2025
Frontend Developer (React / Next.js)	799 USD	799 USD	1 day	31 Oct 2025
Personal account based on the example https://www.searates.com/	Not specified	249 USD	75 days	30 Oct 2025
Fix the errors on the website	56 USD	94 USD	5 days	30 Oct 2025
New frontend based on Figma design for the gaming skins marketplace	Not specified	900 USD	20 days	30 Oct 2025
Looking for an HTML layout designer	448 USD	448 USD	10 days	30 Oct 2025
Freelance project	187 USD	concealed		19 Jun 2025
Layout of the design from Figma to HTML/CSS	Not specified	16 USD	1 day	1 Jun 2025
Layout of the Figma mockup	Not specified	45 USD	1 day	31 May 2025

Backend Developer (Node.js / NestJS)

Status Project expired

Type Public project

Budget 1065 USD

Proposal 1065 USD

Deadline 1 day

Added 31 October 2025

Full Stack Developer (React / Node / Next / Nest)

Status Project expired

Type Public project

Budget 1065 USD

Proposal 1065 USD

Deadline 1 day

Added 31 October 2025

Frontend Developer (React / Next.js)

Status Project expired

Type Public project

Budget 799 USD

Proposal 799 USD

Deadline 1 day

Added 31 October 2025

Особистий кабінет на прикладі https://www.searates.com/

Status Project expired

Type Public project

Budget Not specified

Proposal 249 USD

Deadline 75 days

Added 30 October 2025

Виправити помилки на сайті

Status Project complete

Type Public project

Budget 56 USD

Proposal 94 USD

Deadline 5 days

Added 30 October 2025

Новый фронтенд по дизайну Figma для маркетплейса игровых скинов

Status Closed without completion

Type Public project

Budget Not specified

Proposal 900 USD

Deadline 20 days

Added 30 October 2025

Шукаємо HTML верстальника

Status Project expired

Type Public project

Budget 448 USD

Proposal 448 USD

Deadline 10 days

Added 30 October 2025

Freelance project

Status Project expired

Budget 187 USD

Proposal concealed

Added 19 June 2025

Верстка макета из figma в html/css

Status Project expired

Type Public project

Budget Not specified

Proposal 16 USD

Deadline 1 day

Added 1 June 2025

Верстка макета фигма

Status Project expired

Type Public project

Budget Not specified

Proposal 45 USD

Deadline 1 day

Added 31 May 2025

Kostiantyn Ostapenko
Vinnytsia, Ukraine
5 0
Available for hire

Projects 5
Rating -
Rating 885

Want to offer Kostiantyn Ostapenko a job?

If you have an account, log in

Last project: 1 year back
Collaboration with clients: 5
Last visit: 7 days 9 hours ago

Українська: Fluent
English: Upper-Intermediate
Русский: Upper-Intermediate

Profile

Indicators

Specializations

Javascript and Typescript

CV

Tags

Skills and abilities

Programming

Portfolio Works

Client reviews

Simple landing page

5.0

Kostiantyn Ostapenko

Need to finish the website on next.js+firebase

5.0

Kostiantyn Ostapenko

Site test page

5.0

Kostiantyn Ostapenko

Integration of the website into Telegram Mini App.

5.0

Kostiantyn Ostapenko

Website with an IQ test

5.0

Kostiantyn Ostapenko

Indicators

Total projects:

5

Average rating:

-

5.0

5.0

5.0

5.0

5.0

Activity