Staff ML

Staff ML & AI Scientist Miejsce pracy: Warszawa Technologies we use Expected Python Optional Hadoop TensorFlow About the project The Staff ML Scientist will collaborate with a team to conduct world-class applied AI research on financial payments data, driving innovation in alignment with Visa's strategic vision by incubating new data- and AI-powered products and enhancing existing applications with machine learning and AI. This role represents an exciting opportunity to make key contributions to Visa's strategic vision as a world-leading data-driven company. The successful candidate must have strong academic track record and demonstrate excellent statistical, machine learning and software engineering skills. You will be a self-starter comfortable with ambiguity, with strong attention to detail, and excellent collaboration skills. Your responsibilities Develop and apply cutting-edge algorithms and models, ranging from classical machine learning to deep learning techniques, including advanced neural network architectures such as Transformers, Graph Neural Networks (GNNs), and other emerging paradigms. Pioneer and apply novel data science, deep learning, and AI methodologies to address unique business challenges and drive innovation. Stay up-to-date with the latest research in machine learning, deep learning, and neural network architectures, integrating relevant advancements into business solutions. Build, experiment with, and implement statistical, machine learning, and deep learning algorithms - including custom techniques as well as industry-standard tools. Devise and apply advanced methods for explainability and interpretability of deep learning models, including mechanistic interpretability and model transparency techniques. Develop and implement adaptive learning systems, as well as methods for model validation, A/B testing, and robust performance evaluation. Collaborate with data engineers, software developers, product teams, and business stakeholders to translate business requirements into impactful machine learning solutions. Communicate complex technical concepts, findings, and recommendations clearly to both technical and non-technical audiences. Work with both structured and unstructured data, experimenting with in-house and third-party datasets to evaluate their relevance and value for business objectives. Automate all stages of the predictive pipeline to streamline development and minimize manual intervention in both development and production environments. This is a hybrid position. Expectation of days in office will be confirmed by your Hiring Manager. Our requirements MS or PhD in a quantitative discipline such as Statistics, Data Science, Mathematics, Physics, Operations Research, Engineering, or a related field, with demonstrated strength in machine learning, deep learning, or equivalent practical experience. 7 years of directly related experience applying data science and machine learning to solve business problems, with proficient Python coding skills and deep expertise in statistical analysis. Exceptional problem-solving abilities, with experience designing and implementing complex data science solutions. Hands-on experience developing and deploying deep learning models using PyTorch, including model architecture design and optimization. Strong background in deep learning, including architectures such as Transformers. Experience with Large Language Models (LLMs), natural language processing (NLP), and advanced expertise in time-series modeling techniques. Proficiency with big data tools and frameworks (e.g., Spark, Hadoop), and practical experience implementing MLOps practices such as model versioning, automated deployment, and production monitoring. Strong understanding of model interpretability techniques, with the ability to analyze, articulate, and justify the decision-making processes of machine learning and deep learning models. Experience working with financial data and building machine learning solutions for financial services, trading, risk, or related applications is desired. Publications in recognized machine learning, data mining, or artificial intelligence journals and conferences are a strong plus. This is how we organize our work This is how we work in house agile scrum This is how we work on a project code review pair programming TDD Continuous Deployment Continuous Integration documentation integration tests unit tests Development opportunities we offer development budget industry-specific e-learning platforms intracompany training mentoring soft skills training substantive support from technological leaders support of IT events technical knowledge exchange within the company time for development of your ideas Visa Technology Europe sp. z o.o. Visa is a world leader in payments and technology, with over 259 billion payments transactions flowing safely between consumers, merchants, financial institutions, and government entities in more than 200 countries and territories each year. Our mission is to connect the world through the most innovative, convenient, reliable, and secure payments network, enabling individuals, businesses, and economies to thrive while driven by a common purpose – to uplift everyone, everywhere by being the best way to pay and be paid. Make an impact with a purpose-driven industry leader. Join us today and experience Life at Visa.