résumé
Costin Cocea
Education
Stanford University
May 2026 – PresentCoursework in machine learning and cognitive science
CS229 Machine Learning; SYMSYS1 Minds and Machines; PSYCH80 Mind, Brain, and Behavior.
IÉSEG School of Management
Sep 2025 – Mar 2026Semester abroad · GPA: 18.7/20
Coursework: Data Science, Machine Learning, Econometrics, Research Methods.
Bucharest University of Economic Studies
Sep 2024 – Jun 2027CSIE & FABIZ · Double bachelor’s degrees
B.Sc. in Computer Science and B.Sc. in Economics.
Research & projects
Can Personalized Agents Predict Social Experience?
Aug 2026 – PresentResearch collaboration with Kazuki Kawamura
- Developed personalized LLM agents that use adaptive interviews to model social preferences and assess connections based on users’ goals and context.
- Built a Python/PyTorch recommendation engine that learns from sparse pairwise scores to rank candidates and construct degree-constrained social graphs.
- Designed a longitudinal field study comparing feedback-updated and interview-only agents on compatibility predictions for unseen people. Planned measures: agreement with human judgments, match quality, LLM query efficiency, and interest in reconnecting.
User and Relationship Modeling from Conversation Data
Jun 2026 – Jul 2026- Built a system to model individual behavior and relationship dynamics from WhatsApp conversation data.
- Generated behavioral profiles linked to supporting messages; incorporated user corrections and tracked changes in expressed emotions and communication patterns.
- Compared users’ stated preferences with observed conversational behavior and interaction feedback.
Fine-Tuning Language Models to Predict Human Responses to Interventions
Aug 2026 – Present- Fine-tuned Qwen3.8-27B on SocSci210 with LoRA; compared standard SFT with additional objectives for matching response distributions within experimental conditions and predicting effects between conditions.
- Evaluated generalization to held-out studies using response-distribution and experimental-effect prediction errors; conducted ablations to isolate each additional loss term’s contribution.
The Registry
Apr 2026 – May 2026Semantic Search Engine
- Built an end-to-end Python pipeline for natural-language search over 18,611 university student profiles: data processing, embeddings, FAISS/HNSW approximate nearest-neighbor search, cosine similarity, and top-k retrieval.
Experience
INSPO
May 2025 – Aug 2025Software Engineer, Machine Learning · Tokyo, Japan
- Built and deployed the end-to-end Python ML backend as sole ML engineer for an app with 5,000+ users: outfit generation, personalized ranking, recommendation APIs, and SQL storage.
- Tuned behavioral feature weights with Taguchi orthogonal arrays; increased selection of recommended outfits by 37% versus the previous model in a production A/B test.
BDMS Engineering
Jan 2025 – Mar 2025Data Analyst Intern · Brisbane, Australia
- Designed and deployed a Python/SQL test-analysis platform adopted as the team’s standard workflow: 10M+ sensor readings across 60+ motor/controller test batches. Cut data preparation and verification time by 83% (2 hours to 20 minutes per batch).
- Automated ingestion, validation, and sensor time alignment, detecting 85% of validated anomalies; delivered APIs, an interactive dashboard, reproducible reports, and optimized SQL for hardware comparisons and anomaly analysis.
Skills
- Programming & Frameworks
- Python, C++, C, SQL; PyTorch, scikit-learn, pandas, NumPy, Hugging Face Transformers, Datasets, PEFT.
- Machine Learning
- Supervised/unsupervised learning, deep learning, reinforcement learning, recommendation systems, ranking, embeddings, matrix factorization; LLM fine-tuning (SFT, DPO, LoRA/QLoRA), personalized agents, user modeling.
- Research Methods
- Experimental design, adaptive interviews, longitudinal study design, A/B testing, model evaluation, ablations.
- Research Engineering
- Data pipelines, reproducible GPU experiments, experiment tracking, inference profiling; FAISS/HNSW, FastAPI, PostgreSQL, Docker, CI/CD, pytest.