Mid-level Data Scientist
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Job Description
Mid-level Data Scientist leveraging deep learning and computer vision to transform video streams into structured data. Join HandTalk in breaking communication barriers for the deaf community.
Responsibilities:
- Hands-on work on Data Science projects, preferably with experience in Computer Vision or NLP;
- Strong command of fundamental machine learning concepts (proper data splitting, regularization, hyperparameter tuning);
- Ability to define and compute performance metrics (Accuracy, Precision, Recall, F1-Score) and optimize inference time for real-time operation;
- Practical experience using version control (Git) and Scrum ceremonies;
- Strong knowledge of Python for data manipulation, feature extraction, and model training;
- Practical knowledge of JavaScript/TypeScript for running and integrating models in the frontend;
- Experience with Deep Learning frameworks (TensorFlow) and Computer Vision (integration of the MediaPipe library combined with OpenCV);
- Basic system architecture knowledge and the ability to package simple applications in Docker containers for delivery to Engineering.
Requirements:
- Build, train, and fine-tune neural network models (TensorFlow) focused on recognizing spatial and temporal signals in sign language videos;
- Collect, balance, and apply preprocessing and feature engineering techniques to multimodal data;
- Actively collaborate with the Linguists team to define criteria, domains, and standards for reference videos that need to be recorded and cataloged for training;
- Prepare, convert, and optimize trained Python models so they run efficiently with low latency in the user's browser via JavaScript;
- Structure code, dependencies, and model artifacts in an organized way (via Docker/Git) ensuring a clean handoff to the Engineering team;
- Interest in diversity, inclusion, and accessibility;
- Curiosity;
- Collaborative mindset;
- Multidisciplinary communication skills with the ability to translate technical data needs to linguists while aligning requirements with Engineering and Product teams;
- Organized and action-oriented approach;
- Comfortable working in ambiguity and in early-stage environments;
- Impact-focused — not just output;
- Focus on delivering functional solutions that solve the end user's problem within sprint deadlines;
- Advanced English;
- Experience with model optimization.
Benefits:
- CLT employment contract: your job security and full labor rights guaranteed from day one (Brazilian formal employment regime).
- Caju Benefits Card (R$ 1,160.00): Flexible balance to use as you prefer: meals, groceries, home office, culture, and mobility;
- Remote Work — From Wherever You Are! Work from anywhere in Brazil with flexibility and comfort;
- SulAmérica Health Plan;
- SulAmérica Dental Plan;
- SulAmérica Life Insurance;
- Online consultations with specialists via Conexa Saúde — telemedicine;
- Wellhub: Support to help you perform at your best;
- Extended Year-End Break: Celebrate the holidays with more peace of mind! Enjoy an extended period to recharge with family and friends;
- Birthday day off: Take a special day off in your birthday month;
- Extended Parental Leave: Support and quality time for those starting or expanding their family;
- Continuous Professional Development: Access leading platforms like LinkedIn Learning, plus an annual allowance for courses and training in your area. Invest in yourself;
- University partnerships: Support to go further through discounts and giveaways;
- Brazilian Sign Language (Libras) training: Learn this important language for our community;
- English Pass: English learning to continue advancing your career;
- Work equipment provided as part of your onboarding kit.
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