Data Scientist (Pre-Search)

About the Team At Trendyol Tech, our mission is to create a positive impact in our ecosystem by enabling commerce through technology. We solve complex problems with data, creativity, and agility — always driven by real outcomes. With a culture built on learning, collaboration, and ownership, we grow together while building what’s next. What We Offer - Hybrid working model with flexibility: a schedule that helps you find the right balance between flexibility and team bonding, including work-from-abroad opportunities and a summer working model. - Customisable FlexBenefits budget: Adjust your daily meal allowance, choose your health insurance package (and extend it to your spouse or children), and pick from additional benefits like fuel support or Trendyol shopping credits. - Well-being support: Access to location-based in-house doctors, as well as psychologist and dietitian support, and HPV vaccination provision. - Personalised training allowance and learning opportunities: Use your annual budget for any training or conference of your choice, explore our Learning Management System (LMS) anytime, and join in-person learning sessions offered throughout the year. - Responsibility from day one: Take full ownership from the start in a culture where every voice is heard and valued. - A diverse, international team: Collaborate with global peers across our offices in Berlin, Amsterdam, Dubai, and beyond, in a startup-spirited and collaborative environment. - Opportunities to grow with the best: Tackle meaningful challenges, develop through hands-on experience, and grow with the support of expert guidance and global mentoring. - Meaningful connections beyond tasks: Be part of team rituals, events, and social activities that help us stay connected and inspired. Take the Next Step If this role excites you, apply today, we look forward to taking the next step with you. Want to get to know the team better first? Explore our Career Website, LinkedIn, or YouTube to learn more about #LifeatTrendyol and how we work.

Responsibilities

Develop and improve query understanding capabilities for Trendyol's search experience across multiple regions and languages, including spelling correction, query normalization, query rewriting, intent detection, and semantic retrieval.

Build and evaluate vector search, embedding, and retrieval models that improve the relevance of product discovery for customers across different markets.

Take a leading role in Arabic-language search initiatives, addressing language-specific challenges such as dialectal variation, orthographic normalization, transliteration, morphology, mixed-language queries, and spelling errors.

Analyze large-scale structured and unstructured data, including search queries, product content, user interactions, and linguistic signals across the Trendyol ecosystem.

Design robust offline evaluation methodologies and quality metrics for query understanding, spelling correction, and retrieval systems; validate improvements through online A/B experiments.

Collaborate closely with Search, Pre-Search, Ranking, Product, and Engineering teams to translate customer and business needs into scalable machine learning solutions.

Improve model quality, latency, reliability, and deployment cycles by applying MLOps best practices to production ML systems.

Monitor model and search-quality performance after deployment, investigate regressions, and continuously iterate based on data and user feedback.

Communicate methodology, findings, and expected business impact clearly to technical and non-technical stakeholders.

Expected Qualifications

Experience in applied data science and machine learning, ideally in NLP, information retrieval, search, or language modeling domains.

Professional working proficiency in Arabic, with a strong understanding of Arabic grammar, morphology, spelling conventions, dialectal variation, and common search-query behavior. Native-level proficiency is a strong plus.

Practical experience with modern NLP methods, including transformer-based language models, text embeddings, semantic search, retrieval, reranking, query understanding, or spelling correction.

Familiarity with Arabic NLP resources, datasets, tokenization or normalization approaches, and evaluation challenges is highly preferred.

Strong Python skills and hands-on experience with relevant ML libraries such as PyTorch, TensorFlow, scikit-learn, Hugging Face Transformers, or similar frameworks.

Strong SQL knowledge and familiarity with data-analysis best practices.

Experience with vector databases, approximate nearest neighbor search, embedding models, or large-scale retrieval systems is a strong plus.

Experience designing and interpreting A/B experiments, offline evaluations, and statistical analyses.

Strong analytical skills, a data-driven mindset, and the ability to work effectively with ambiguous product problems.

Excellent written and verbal communication skills in English. Turkish is a plus.

Experience in e-commerce, marketplaces, search, recommendation, or self-service platforms is a plus.