Kyivstar4mo ago

LLM Research Engineer (NLP)

KyivRemoteFull-Time (Full Remote)mid

Data ScienceOtherResearch Engineer

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Quick Summary

Overview

We are seeking an experienced Data Scientist with a passion for large language models (LLMs) and cutting-edge AI research. In this role, you will design and prototype data preparation pipelines,

Technical Tools

Data ScienceOtherResearch Engineer

We are seeking an experienced Data Scientist with a passion for large language models (LLMs) and cutting-edge AI research. In this role, you will design and prototype data preparation pipelines, collaborating closely with data engineers to transform your prototypes into scalable production pipelines, design and implement a state-of-the-art evaluation and benchmarking framework to measure and guide model quality, and do end-to-end LLMs training. You will work alongside top AI researchers and engineers, ensuring our models are not only powerful but also aligned with user needs, cultural context, and ethical standards.

About us

Kyivstar.Tech is a Ukrainian hybrid IT company and a resident of Diia.City.We are a subsidiary of Kyivstar, one of Ukraine’s largest telecom operators.

Our mission is to change lives in Ukraine and around the world by creating technological solutions and products that unleash the potential of businesses and meet users’ needs.

Over 500+ KS.Tech specialists work daily in various areas: mobile and web solutions, as well as design, development, support, and technical maintenance of high-performance systems and services.

We believe in innovations that truly bring quality changes and constantly challenge conventional approaches and solutions. Each of us is an adherent of entrepreneurial culture, which allows us never to stop, to evolve, and to create something new.

Curation of datasets for pre-training, supervised fine-tuning, and alignment

Research and develop best practices and novel techniques in LLM training and evaluation pipelines.

Collaborate closely with data engineers, annotators, linguists, and domain experts to scale data processes, define evaluation tasks and collect high-quality feedback.

Education & Experience:

3+ years of experience in Data Science or Machine Learning, preferably with a focus on NLP.

An advanced degree (Master’s or PhD) in Computer Science, Computational Linguistics, Machine Learning, or a related field is highly preferred.

GenAI & NLP Expertise:

Practical experience with fine-tuning LLMs / VLMs models

Hands-on experience with modern NLP approaches, including embedding models, semantic search, text classification, sequence tagging (NER), transformers/LLMs, RAGs.

ML & Programming Skills:

Strong experience with deep learning frameworks such as PyTorch or JAX for building models.

Ability to write efficient, clean code and debug complex model issues.

Advanced NLP/ML Techniques:

Applied experience using Reinforcement Learning in NLP / LLM settings

Prior work on LLM safety, fairness, and bias mitigation.

Experience generating and curating synthetic datasets for Supervised Fine-Tuning (SFT), including quality control and scaling considerations.

Research & Community:

Publications in NLP/ML conferences or contributions to open-source NLP projects.

Active participation in the AI community or demonstrated continuous learning (e.g., Kaggle competitions, research collaborations) indicates a passion for staying at the forefront of the field.

MLOps & Infrastructure:

Hands-on experience with containerization (Docker) and orchestration (Kubernetes) for ML, as well as ML workflow tools (MLflow, Airflow).

Experience in working alongside MLOps engineers to streamline the deployment and monitoring of NLP models.

Experience with cloud platforms (AWS, GCP, or Azure) and big data technologies (Spark, Hadoop, Ray, Dask) for scaling data processing or model training is a plus.

Problem-Solving:

Innovative mindset with the ability to approach open-ended AI problems creatively.

Comfort in a fast-paced R&D environment where you can adapt to new challenges, propose solutions, and drive them to implementation

Office or remote — it’s up to you. You can work from anywhere, and we will arrange your workplace

Remote onboarding

We train employees with the opportunity to learn through the company’s library, internal resources, and programs from partners

Health and life insurance

Wellbeing program and corporate psychologist

Reimbursement of expenses for Kyivstar mobile communication

Listing Details

Posted: December 5, 2025
First seen: March 26, 2026
Last seen: April 24, 2026

Posting Health

Days active: 28
Repost count: 0
Trust Level: 39%
Scored at: April 24, 2026

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Kyivstar

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Kyivstar is the leading telecommunications provider in Ukraine, serving millions with a wide range of communication services and innovative technologies.

Employees

3k+

Founded

1994

Domain

Jobs

External application · ~5 min on Kyivstar's site

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