Andrei Stefanescu
Andrei Stefanescu

Senior AI Engineer

Actively looking · Member since 27 Oct 2026
Location
Cluj-Napoca, Romania
Desired salary
Unspecified
Work preference
Remote Only
Experience level
Senior

About

Professional summary

I am a Senior AI Engineer with 10 years of experience building production machine learning systems, LLM-powered products, retrieval systems, tool-using agents, and real-time computer vision platforms.

I specialize in Python-based AI engineering, including agent orchestration, RAG architecture, prompt and context design, model evaluation, fine-tuning, MLOps, LLMOps, and production reliability.

I have led the design and delivery of enterprise AI applications using LangChain, LangGraph, LlamaIndex, FastAPI, Amazon Bedrock, OpenSearch, Qdrant, and cloud-native deployment platforms.

I build measurable and safe AI systems through evaluation suites, regression benchmarks, observability, structured logging, trace analysis, human review workflows, and feedback loops.

My background also includes computer vision, natural language processing, machine learning research, real-time inference optimization, and scalable data and model pipelines.

I work closely with product, research, infrastructure, frontend, data, and engineering teams to turn experimental model capabilities into reliable user-facing products.

Skills

30 capabilities

Tech stack & tools

Working toolkit

Experience

Career history

Senior AI Engineer Kibit Solutions Ltd.

Led the architecture and delivery of production LLM agents and enterprise RAG systems using LangChain, LangGraph, LlamaIndex, FastAPI, Amazon Bedrock, OpenSearch, Qdrant, and tenant-isolated vector indexes. Built orchestration layers for long-running coding and knowledge workflows with typed Pydantic state, explicit tool contracts, checkpointing, retries, and recoverable execution.

Created evaluation suites using golden tasks, LLM judges, deterministic assertions, RAGAS checks, and regression benchmarks. Built multi-tenant SaaS applications and autoscaling inference services with Python, TypeScript, React, Node.js, AWS ECS, PostgreSQL, MongoDB, Docker, Kubernetes, Terraform, SageMaker Pipelines, and Airflow. Instrumented services with Langfuse, trace telemetry, structured logs, and replayable production traces.

AI/ML Engineer V2Sof

Built Python and FastAPI backends for AI-powered customer interview and recommendation platforms. Implemented adaptive text and voice conversations using OpenAI and Anthropic models, Pydantic response schemas, tool calling, conversational memory, human-review workflows, and production safety controls.

Developed secure enterprise assistants with Llama 3.1, Ollama, LangChain, FAISS, and access-aware retrieval. Established MLOps and evaluation workflows with Hugging Face, PyTorch, Docker, MLflow, Azure, LangGraph, LiteLLM, PostgreSQL, and MongoDB. Also delivered Stable Diffusion-based image-to-image toonification models using DreamBooth, LoRA, and SageMaker inference endpoints.

Machine Learning Engineer Chainbalance

Built automated line-calling systems for professional badminton using synchronized multi-camera video, YOLO object detection, Kalman filtering, epipolar constraints, calibration, and trajectory reconstruction. Developed real-time table-tennis analytics pipelines using pose estimation, action recognition, object detection, and temporal state machines.

Optimized live deep-learning inference with NVIDIA TensorRT, asynchronous video processing, batched preprocessing, and pinned-memory transfer. Created geospatial property-mapping systems with PyTorch U-Net segmentation, satellite imagery, NumPy, SciPy, and post-processing. Managed data preparation, augmentation, experiment tracking, active learning, and model-assisted annotation with Label Studio.

Artificial Intelligence Researcher Accedia

Built NLP baselines for text classification, information extraction, semantic similarity, and document retrieval using tokenization, embeddings, classical machine learning, and neural sequence models. Developed CNN pipelines for image classification, object detection, and segmentation.

Created benchmark datasets, evaluation scripts, experiment harnesses, hyperparameter search workflows, ablation studies, checkpoint management, and reproducible train-validation-test processes. Investigated dataset and model failure modes, including noisy labels, class imbalance, distribution shifts, and sparse examples, and supported model integration through lightweight Python services.

Education

Learning history

Technical University of Cluj-Napoca

Bachelor's degree, Computer Science

Bachelor's degree in Computer Science.

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