Yelena Druzenko
Private message 
Offer work 
Odessa,
Ukraine
available for hire
Rating
Language proficiency level
Русский: fluent
Українська: advanced
English: intermediate
Polski: pre-intermediate
Skills and abilities
Programming
Services
Translation
Portfolio
- All works 10
- Databases & SQL 1
- Web Programming 1
- Desktop Apps 2
- Bot Development 2
- Cryptocurrency & Blockchain 4
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Fantom
Cryptocurrency & Blockchain
Tracking transactions for adding and removing liquidity in networks:
* etherscan.io
* snowtrace.io
* ftmscan.com
… * bscscan
* arbiscan
Creating a leaderboard based on transaction frequency, tracking large transactions, deposit operations, and other functions.
Skills: #Cryptocurrency · #Delphi · #RelationalDatabases · #FinancialAnalysis
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Arbitrator (arbitration bot)
Cryptocurrency & Blockchain
* work through the API of exchanges gate.io and bybit.com
* The bot tracks spot and Perpetual Futures quotes of both exchanges
* Depending on the conditions, it makes purchases and sales automatically
…
Skills: #TradingSystems · #Cryptocurrency · #Delphi · #RESTAPIs · #Automation
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BncFutures (bot on Binance futures)
Cryptocurrency & Blockchain
There is a price for the currency, the bot follows the price, if the price rises by a certain percentage over a certain time (for example, by 2% in 30 seconds), a buy signal is triggered based on the specified parameters and a stop-loss is simultaneously set.
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SportParser - scripting language for analyzing sports events
Bot Development
Collection and analysis of data on sports events on the website sofascore.com (tennis tournaments).
A powerful scripting language has been implemented with support for specific domain objects. Using scripts, the user sets strategies for searching for events in real-time, defines criteria for sending signals, and accumulates statistics in the database.
Script examples: see screenshots
…
Skills: #Scripting · #Parsing · #Delphi · #Strategy · #SoftwareDevelopment
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TelegramHelper (Telegram message dispatcher)
Bot Development
Microservice for sending messages to Telegram. Buffering and organizing batch sending of messages coming from multiple applications.
Main functions:
queuing messages for subsequent sending to the specified channel;
merging multiple messages into one to reduce load in case of mass sending of messages to avoid exceeding limits and bans;
… delayed sending of messages.
Skills: #MessageQueue · #telegramApi · #Delphi · #Microservices
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ContractScore (contract evaluation)
Cryptocurrency & Blockchain
Data collection from etherscan.io and bscscan.com and automatic evaluation of contracts.
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PDF Mailer - newsletters
Desktop Apps
Mailing Program
The program contains a database of companies. For each company, information about the manager and the contact person can be specified, thus each company has two sets of contact details.
Templates are divided into two types – letters to the manager and letters to the contact person.
Variables in curly braces can be used in the subject line and the body of the message. Instead of these variables, information from the database will be substituted for each letter individually.
… The text of the letter can be specified in both plain text format and HTML format.
Similarly, an attachment can be prepared in the body of the letter – a personalized document that will be attached to the letter. To do this, create a document in Microsoft Word or another editor and save it in RTF format. Variables can be used in the document.
When sending letters, the program will substitute the values of the variables, convert the file to PDF format, and attach it to the letter.
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Program for accounting promotional staff and advertising campaigns
Databases & SQL
Program for effective documentation management and personnel database maintenance. Key features: personnel questionnaires, archive, blacklist, an unlimited number of photos and documents of any format can be attached to each questionnaire. Promotions are generated automatically based on requests for specific types of services. Reporting: payroll statement.
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Bd Hotel Assessments based on data of seven resources
Web Programming
The program carries out a search for the hotel and sets out the hotel’s ratings according to seven internet resources.
You can click on each rating to get to this hotel page.
The data can be saved in your database, which is updated when repeated request.
It is possible to export results to Excel, add comments. Also integrated search in Google.
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by OddsPortal.com
Desktop Apps
Parser collects information about the matches on the OddsPortal.com website. Working on a timer, on a schedule, can send notifications to the specified mailbox about matches/setting that meet the condition.
Reviews and compliments on completed projects 5
21 July 2025
203 USD
Parsing data from bulletin boards
The worst experience in 15+ years of working with freelancers.
Total rudeness.
Perhaps if you are a well-versed technical specialist with a full understanding of the process (API, databases, servers, proxies, etc.), it would be comfortable for you to work with Elena.
But if you are not technically very skilled (not mid-level+), be prepared for some unpleasant situations.
If you:
- want to suggest a solution to the problem, be ready to receive a sarcastic response "Great idea. Contact OLX support, maybe their programmers are listening to your optimization advice";
- do not respond on weekends, then you are deliberately delaying (unclear why);
- accidentally sent a slightly cropped screenshot - you are a falsifier;
- do not respond within 6 hours, then threats are made to close the project in its raw state due to lack of contact;
- you, 2 developers, and Chat GPT cannot find in the API documentation the list of all transmitted parameters - you are unprofessional.
Also, during the parser setup, Elena connected a database tariff on AWS that consumed over $250 in a week. Which looks like negligence.
Unfortunately, it was not possible to check all the work, because for any question instead of brief answers, the executor throws accusations. And for the time "spent" on writing these messages, she demands additional payment.
20 March 2025
41 USD
Improvement of the seatable table
Everything is excellent and very detailed. I recommend.
Just a wonderful performer, pointed out mistakes, added possibilities.
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4 February 2025
150 USD
Test task from JS text
Olena is a great professional in her field, an expert in several programming languages, and it shows. Everything is excellent, the highest quality of execution! She exceeded expectations! I recommend!
3 February 2025
113 USD
REST API for Delphi project & Windows server deployment
The work was completed within the stated deadlines. I will cooperate and recommend!))
Activity
| Latest proposals 10 | Budget | Added | Deadlines | Proposal | |
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Parsing websites for the availability of our brand's assortment.
16 USD
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PDF B EXCEL
1500 USD
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Electronic book with jpeg
56 USD
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Bot
56 USD
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Program for automatic generation of land lease agreements
23 USD
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Development of CRM/accounting on Google Sheets.
68 USD
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Parser 1688 + auto-generation of posts for Telegram channel
100 USD
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Work in GeoGebra
56 USD
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Production accounting system (Cash Flow + Expenses + Warehouse + Write-offs + Orders/Batches + P&L + Dashboard)
23 USD
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Telegram Bot for extracting data from photo / pdf / word and filling this data into Excel
90 USD
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