Senior Python

48 minutes ago

Toronto ON MH B, Canada 247 Labs Full time

Senior Python & ML Engineer (Flask/FastAPI/Django + AI/ML/LLMs)

About the Role

We are looking for a Senior Python & ML Engineer who can design and build end-to-end AI/ML solutions alongside scalable backend systems. This role requires deep expertise in Python (Flask, FastAPI, Django), strong experience with developing and deploying ML models, and hands-on work with LLMs, computer vision, and prompt engineering.

You will not only build APIs and backend infrastructure but also develop machine learning models from scratch, fine-tune them, and optimize them for production.

Responsibilities

  • Architect, develop, and maintain scalable backend services using Flask, FastAPI, and Django.

  • Design, train, and optimize ML models (NLP, LLMs, computer vision, embeddings, classification, clustering).

  • Fine-tune and adapt LLMs for domain-specific tasks, ensuring efficiency and accuracy.

  • Apply prompt engineering techniques to improve LLM-driven workflows.

  • Build and evaluate computer vision models for detection, classification, or recognition tasks.

  • Research and prototype new ML algorithms, pipelines, and frameworks.

  • Deploy models into production with MLOps best practices (Docker, CI/CD, monitoring).

  • Collaborate with product, data, and frontend teams to design AI-powered features end-to-end.

  • Ensure robust testing, performance optimization, and documentation of ML + backend systems.

Required Skills

  • 7+ years professional experience in Python backend development.

  • Deep hands-on experience with Flask, FastAPI, and Django.

. Architect and manage PostgreSQL databases, including schema design, indexing, query optimization, and ORM best practices.

  • Strong foundation in machine learning (scikit-learn, PyTorch, TensorFlow, Hugging Face, etc.).

  • Proven experience developing ML models (NLP, LLMs, embeddings, vision).

  • Knowledge of data preprocessing, feature engineering, and model evaluation.

  • Experience with LLM frameworks (LangChain, OpenAI APIs, Hugging Face Transformers).

  • Familiarity with vector databases (FAISS, Pinecone, pgvector, Weaviate).

  • Strong database skills (PostgreSQL/MySQL).

  • Experience with cloud platforms (AWS/GCP/Azure) and containerization (Docker/Kubernetes).

  • Solid understanding of CI/CD, Git, and agile workflows.

  • Experience with Retrieval-Augmented Generation (RAG) systems.

Job Type: Fixed term contract

Contract length: 24 months

Pay: $40.00-$42.00 per hour

Work Location: Hybrid remote in Toronto, ON M5H 3B3

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