Denis Polezhaka
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Offer work 
Kharkiv,
Ukraine
9 months 28 days back
available for hire
age 22 years
on the service 10 months 28 days
Rating
Successful projects
Average rating
Language proficiency level
Українська: fluent
English: upper-intermediate
Skills and abilities
Portfolio
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699 USD Price navigator for food products
Web Programming
Developed a #web_service #price_monitoring for #food_products that automatically collects #data from various #online_stores (#ATB, #Auchan, #Silpo, #ROST) using #ParseHub. The obtained #JSON_data is #normalized and #cleaned: names are formatted to a standard format, weight is converted to grams, and extra characters are removed. Using a combination of #NER_model #spaCy (#uk_core_news_lg) and #dictionary_approach, entities (#brand, #type, #flavor, etc.) are extracted, followed by #clustering of products with #fuzzy_grouping (#fuzzywuzzy). Processed data is stored in #MongoDB, #backend is implemented on #Expressjs, and #frontend on #React + #Redux with an #interactive_interface for #quick_price_comparison and #searching_for_beneficial_offers.
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451 USD Automated platform for collecting and analyzing product reviews
Web Programming
Created a full-fledged #web_application that #automates_data_collection and #product_features from various sources via #ParseHub, highlights entities (#brand, #model, #memory, #color, etc.) using #neural_network #SpaCy, combines options of the same model into #clusters with a unique set of #specifications and #normalized_reviews, and then provides users with an #intuitive_interface (#React + #Redux) with fast #filtering and #search. The server part on #Nodejs / #Express with #MongoDB ensures #flexible_processing of #JSON_data, high #query_performance, and easy #integration_of_new_sources.
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1804 USD Web application for university
Web Programming
Developed a full-fledged #webapplication for #students, which allows centralized management of #class_schedule, #deadlines, #assignments, and #communication within an academic group. Implemented a #client‑server_architecture (#React + #Redux + #Nodejs + #Express + #MongoDB). Provided authorization via #JWT, role-based access control (#student / #class_representative), #EditMode editing mode, a user-friendly interface, and informative visualizations (#calendar, #task_tracker, #student_list). The application is optimized for responsive use, focusing on #UX, #security, and #scalability.
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755 USD Web application for IT school
Web Programming
Web application #Fullstack CodeMastery - is an interactive platform for creating and taking tests on full-stack development topics. #Frontend is implemented on #React and #Next.js with support for #SSR/SSG and responsive design, while smooth transition animations and question loading are provided by #FramerMotion. #Back-end is built on #mongodb (via #API routes Next.js) for storing test questions, answers, and user statistics.
Activity
| Latest proposals 5 | Budget | Added | Deadlines | Proposal | |
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Layout needed in React (9 pages)
550 USD
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Bug fixes and adding new features to the website for taking tests
23 USD
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Looking for a front-end developer to create an online postcard with a scratch-off effect
23 USD
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Create a simple one-page landing page in HTML
23 USD
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Website development based on a ready-made design
1000 USD
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