Stanislav Shaschuk - Data Annotator for AI and NLP Models

Recommended expert

Lviv, Ukraine

Check rate

Experience

Dec 2024 - May 2025

6 months

Lviv, Ukraine

Data Annotator

Highbrow Technology Inc.

Annotate and evaluate mathematics content in Ukrainian, Russian, and English languages
Solve and analyze unsolved problems using basic high school–level mathematics
Work with various math topics, including Calculus, Algebra and Functions, Data, Statistics, and Probability, and Geometry & Structured Images
Analyze tables, quantitative diagrams, infographics, and image-based documents to create high-quality and engaging math questions
Maintain accuracy, clarity, and detail in all annotations and question QA development
Collaborate with an international team to ensure content meets educational standards
Use skills in RLHF on Turing platform, critical thinking, time management, data annotation, and Google Sheets

Oct 2024 - Dec 2024

3 months

Lviv, Ukraine

Language Annotator

Highbrow Technology Inc.

Analyze and label linguistic data such as text, audio, or speech according to project guidelines
Identify and correct grammatical, syntactic, and semantic errors
Evaluate and annotate language content to train and improve AI and NLP models
Follow detailed instructions and maintain high annotation accuracy and consistency
Collaborate with team members and provide feedback to enhance annotation quality

Jul 2019 - Aug 2023

4 years 2 months

Poltava, Ukraine

Operator Assistant II – Cementing

Halliburton

Assisted in rigging-up/rigging-down, equipment inspections, and preventive maintenance
Performed pre-job calculations (volumes, pressures, capacities) and prepared technical documentation
Executed cementing and plug jobs, including pressure testing (up to 15,000 PSI)
Ensured compliance with safety standards and accurate reporting

Nov 2018 - May 2019

7 months

Poltava, Ukraine

Driller Assistant (First)

Smith Ukraine

Assisted in rigging-up and rigging-down of rig equipment
Performed general repairs and maintenance on significant and minor rig components
Assisted with mud-mixing duties
Performed catching samples, used tongs, slips, and chain to connect and disconnect drilling pipe, tubular, and drilling bits or tools
Checked hoist lines and ropes for blocks

Data Annotator

Appen CrowdGen

Evaluated the quality of potentially unethical or unsafe LLM model prompts and responses translated into Russian
Assessed translation quality and how well the model deflects unsafe material while remaining relevant to the prompt

Data Annotator

Appen CrowdGen

Performed short video annotation for language identification (LID)
Classified languages in titles, hashtags, subtitles (OCR), and audio (ASR)
Delivered overall language prediction with 95%+ accuracy
Applied data privacy and discard rules to sensitive content
Followed SOP processes: moderation, QA, and calibration
Worked with Russian and mixed-language video content, including dialects

Data Annotator

Appen CrowdGen

Transcribed short Russian audio with a tagging system (e.g., , , , )
Marked invalid cases (#NG) and ensured quality per guidelines
Followed rules for numbers, abbreviations, and borrowed words

Data Annotator

MAI OCR

Annotated images containing English and Russian words with bounding boxes at word, line, and paragraph levels using SRT HALO tool
Transcribed printed and handwritten text with high accuracy, preserving case, accents, and special characters
Identified languages per word and flagged illegible or unknown scripts
Differentiated between overlaid and scene text to improve OCR training data quality
Ensured consistency by correcting pre-annotations and following rejection criteria

Data Annotator

RWS Workzone

Annotated and validated 10,000+ Ukrainian text samples for dialect identification in GenAI datasets
Corrected system-predicted language labels, including handling Romanized variants and unsupported dialects
Applied quality standards to reject non-linguistic content (e.g., gibberish, hashtags, proper nouns)
Ensured accuracy and consistency of annotations across multiple dialects and scripts

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Energy, Education, and Information Technology.

Energy

Education

Information Technology

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Operations and Quality Assurance.

Operations

Quality Assurance

Skills

Solid Experience With Rlhf On Turing Platform.
Critical Thinking
Time Management
Prompt Evaluation
Problem-Solving Mindset
Attention To Detail
Data Annotation
Transcription
Rlhf
Qa
Ocr
Google Sheets
Ms Office
Excel
Solve And Analyze Unsolved Problems Using Basic High School–Level Mathematics.
Work With Various Math Topics, Including Calculus, Algebra And Functions, Data, Statistics, And Probability, Geometry & Structured Images.

Languages

Russian

Native

Ukrainian

Native

English

Advanced

Education

Sep 2015 - Jun 2016

Ivano-Frankivsk National Technical University of Oil and Gas

Master of Mining Engineering (Well Drilling) · Mining Engineering (Well Drilling) · Ivano-Frankivsk, Ukraine

Sep 2011 - Jun 2015

Ivano-Frankivsk National Technical University of Oil and Gas

Bachelor of Mining · Mining · Ivano-Frankivsk, Ukraine

Statistics

Experience

Total positions 9

Experience in Energy 4.5 y

Avg length 7 m

Longest experience 4 y 1 m

Global Experience

Countries worked in 1 (Ukraine)

Primary country Ukraine

Expertise

Recent roles Data Annotator, Language Annotator, Operator Assistant II – Cementing

Main industries Energy, Education, Information Technology

Main business areas Operations, Quality Assurance

Qualifications

Highest degree Master

Profile

Created

September 2025

Last Update

October 2025

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Frequently asked questions

Have questions? Find more information here.

Stanislav is based in Lviv, Ukraine.

Stanislav speaks the following languages: Russian (Native), Ukrainian (Native), English (Advanced).

Stanislav has at least 5 years of experience. During this time, Stanislav has worked in at least 4 different roles and for 3 different companies. The average length of individual experience is 1 year and 4 months. Note that Stanislav may not have shared all experience and actually has more experience.

Based on recent experience, Stanislav would be well-suited for roles such as: Data Annotator, Language Annotator, Operator Assistant II – Cementing.

Stanislav's most recent position is Data Annotator at Highbrow Technology Inc..

In recent years, Stanislav has worked for Highbrow Technology Inc. and Halliburton.

Stanislav is most experienced in industries like Energy, Information Technology, and Education.

Stanislav is most experienced in business areas like Operations, Quality Assurance, and Research and Development.

Stanislav holds a Master in Mining Engineering (Well Drilling) from Ivano-Frankivsk National Technical University of Oil and Gas and a Bachelor in Mining from Ivano-Frankivsk National Technical University of Oil and Gas.

Stanislav is immediately available part-time for suitable projects.

Daily Rate Distribution

0 1 2 3 4

<€240 €240-320 €320-400 €400-480 €560+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

400

300

200

100

Daily rate avg. 314 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

400

300

200

100

Median rate 320 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.