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Middle NLP Data Scientist

Location

Worldwide

Posted

1 day ago

Salary

0

Seniority

Mid Level

Job Description

Middle NLP Data Scientist

hireforyou.pro

Role Description Our client is building an AI-powered job matching platform used by tens of thousands of active users every month. Matching quality is at the core of the product. Behind it is an ML-powered ranking system that determines which jobs each candidate sees. We are looking for a Middle NLP Data Scientist to own and advance this ranking stack: fine-tuning transformer models, designing training data, and turning offline improvements into measurable production impact. What You'll Do: - NLP Reranking (Core Responsibility) - Design, fine-tune, and iterate on different NLP algorithms (bi-encoders, cross-encoders) for persona–job matching. - Work across the NLP model stack: bi-encoder embeddings, text-pair classification, and cross-encoder reranking. - Build training data for ranking models: LLM-based labeling and improvement of human-annotated datasets. - Own offline and online evaluation: metric design (nDCG, recall@k), experimentation, and monitoring model performance in production. - Feature Engineering & Signal Extraction - Design feature pipelines from unstructured text (job descriptions, application forms, candidate profiles) and structured fields. - Build reusable, well-documented features suitable for both offline training and online inference. - Identify new signals and data sources that measurably improve matching quality. - LLM-Based Extraction & Data Foundations - Use LLMs for structured extraction from noisy text: prompt design for JSON output, schema validation, and automatic repair. - Audit existing data sources and build training-ready datasets for ML models. - Define data requirements with engineers: logging standards, formats, quality metrics, and monitoring signals. - Collaboration & Production Ownership - Work closely with backend and ML engineers to bring models to production (batch and near–real-time), define inference APIs, and ensure observability. - Own the end-to-end lifecycle: from data and features, to models, to production impact. First 3 Months - Expected Results: - Full understanding of the existing matching pipeline and its failure modes. - An upgrade to the ranking logic - strong improvement of current bi-encoders / cross-encoders. - A defined offline↔online evaluation loop and a clear baseline to measure every ranking change against. - Tangible, measured improvements in ranking quality (e.g. nDCG@10, recall@k) versus the current baseline. Qualifications - 2+ years of experience in Data Science / ML with a focus on NLP. - Hands-on experience fine-tuning transformer models (BERT-family, sentence-transformers, cross-encoders / bi-encoders). - Solid understanding of text embeddings, semantic similarity, and reranking. - Experience building training datasets for NLP models (including synthetic / LLM-labeled data). - Strong Python skills and comfort with the PyTorch / HuggingFace ecosystem. - Experience taking ML models to production together with engineers. - Solid SQL knowledge and sound offline/online evaluation habits. Requirements - Experience with search, ranking, or recommender systems (retrieval, Learning-to-Rank, hybrid sparse+dense search, BM25 + embeddings). - Experience with vector databases / ANN indexes (Qdrant, FAISS, etc.) and search engines (Elasticsearch / OpenSearch). - Practical experience using LLMs in production (extraction, labeling, evaluation). - Familiarity with HR tech, ATS systems, or marketplace products. Benefits - Market salary. - 20 workdays/year paid vacation. - Full-time remote work with flexible working hours. - Fast-paced, product-driven environment with real ownership and autonomy. - Opportunity to shape architecture and tech stack in a VC-backed startup from the early stages. - Close collaboration with a strong product team (PM, Design, Growth). - A culture of transparency, minimal bureaucracy, and quick decision-making. - Smart, ambitious teammates who value impact over process.

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