{"id":586815,"url":"https://alion.io/job/trendyol-data-scientist-pre-search","title":"Data Scientist (Pre-Search)","company":{"id":49289,"name":"Trendyol","domain":"trendyol.com","url":"https://alion.io/company/trendyol","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":85,"open_postings":15,"ghost_share":0,"stale_share":0.6,"repost_share":0,"time_to_fill_p50_days":51,"computed_at":"2026-11-09T06:03:00Z"}},"role":"Data Science","role_family":"Data Science","seniority":null,"employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Istanbul, Turkey"],"countries":["TR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Embeddings","optional":false},{"name":"Hugging Face","optional":false},{"name":"Machine Learning","optional":false},{"name":"NLP","optional":false},{"name":"Python","optional":false},{"name":"PyTorch","optional":false},{"name":"Reranking","optional":false},{"name":"Scikit-learn","optional":false},{"name":"Semantic Search","optional":false},{"name":"SQL","optional":false},{"name":"TensorFlow","optional":false},{"name":"Tokenization","optional":false},{"name":"Transformers","optional":false}],"status":"live","first_seen_at":"2026-09-01T07:22:25Z","employer_posted_date":"2026-09-01","last_verified_at":"2026-11-09T14:24:32Z","board_verified":true,"closed_at":null,"days_open":69,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":68},"description":"About the Role\nOur team builds the language intelligence and retrieval foundations behind Trendyol Search across multiple regions. We focus on helping customers express their intent accurately and discover relevant products quickly, regardless of the language or market they search in. As a Data Scientist, you will work on high-impact problems at the intersection of NLP, information retrieval, and e-commerce search. You will contribute to multi-regional search models covering spelling correction, query understanding, semantic and vector search, while taking particular ownership in improving the Arabic-language search experience. Your work will directly improve product discovery for millions of customers across Trendyol's markets.\nResponsibilities\nDevelop 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.\nBuild and evaluate vector search, embedding, and retrieval models that improve the relevance of product discovery for customers across different markets.\nTake 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.\nAnalyze large-scale structured and unstructured data, including search queries, product content, user interactions, and linguistic signals across the Trendyol ecosystem.\nDesign robust offline evaluation methodologies and quality metrics for query understanding, spelling correction, and retrieval systems; validate improvements through online A/B experiments.\nCollaborate closely with Search, Pre-Search, Ranking, Product, and Engineering teams to translate customer and business needs into scalable machine learning solutions.\nImprove model quality, latency, reliability, and deployment cycles by applying MLOps best practices to production ML systems.\nMonitor model and search-quality performance after deployment, investigate regressions, and continuously iterate based on data and user feedback.\nCommunicate methodology, findings, and expected business impact clearly to technical and non-technical stakeholders.\nExpected Qualifications\nExperience in applied data science and machine learning, ideally in NLP, information retrieval, search, or language modeling domains.\nProfessional 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.\nPractical experience with modern NLP methods, including transformer-based language models, text embeddings, semantic search, retrieval, reranking, query understanding, or spelling correction.\nFamiliarity with Arabic NLP resources, datasets, tokenization or normalization approaches, and evaluation challenges is highly preferred.\nStrong Python skills and hands-on experience with relevant ML libraries such as PyTorch, TensorFlow, scikit-learn, Hugging Face Transformers, or similar frameworks.\nStrong SQL knowledge and familiarity with data-analysis best practices.\nExperience with vector databases, approximate nearest neighbor search, embedding models, or large-scale retrieval systems is a strong plus.\nExperience designing and interpreting A/B experiments, offline evaluations, and statistical analyses.\nStrong analytical skills, a data-driven mindset, and the ability to work effectively with ambiguous product problems.\nExcellent written and verbal communication skills in English. Turkish is a plus.\nExperience in e-commerce, marketplaces, search, recommendation, or self-service platforms is a plus.","description_format":"text","description_chars":3782,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"Arabic","level":"Upper-Intermediate (B2)","optional":false},{"language":"English","level":"All levels","optional":false}]},"benefits":[],"hiring_locations":[{"name":"Turkey","iso":"TR","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["E-commerce Platforms","Marketplaces"],"lifecycle":[{"event":"open","at":"2026-09-10T05:39:29Z"}],"visa":[],"liveness":{"score":23,"band":"cold","label":"Long shot","p_open":1,"p_active":0.417,"p_room":0.55,"age_days":68,"expected_fill_days":51,"reasons":["conf:1","stale_co","win:tail"],"computed_at":"2026-11-09T06:03:00Z"},"pay":null,"html_url":"https://alion.io/job/trendyol-data-scientist-pre-search","json_url":"https://alion.io/job/trendyol-data-scientist-pre-search.json","meta":{"generated_at":"2026-11-09T17:38:57Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":1442,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-10T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":49289},"rest":"https://alion.io/mcp/rest/get_company?id=49289"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ftrendyol-data-scientist-pre-search"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Ftrendyol-data-scientist-pre-search"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Ftrendyol-data-scientist-pre-search"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/trendyol-data-scientist-pre-search\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ftrendyol-data-scientist-pre-search"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":586815}},{"tool":"search_jobs","arguments":{"company":"trendyol.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":586815},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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