Blockchain application development, high-load web services design and AI engineering. - 3+ years of experience in Python, C/C++ and PHP with strong theoretical knowledge of language capabilities. Practical background in Java, Swift, JavaScript, Solidity. Good understanding of Object-oriented and Functional programming paradigms. - Strong theoretical knowledge of fundamental principles of blockchain philosophy, big practical background in Ethereum smart-contract development (Solidity). - Big experience in application development using various web frameworks: Yii2 (PHP), Spring, ZK (Java), Django, Flask (Python). Well familiar with relational and non-relational databases (MySQL, SQLite, PostgreSQL, MongoDB). Confident in the basic front-end technologies (CSS, HTML, JavaScript). - Confident in following mathematical domains: probability and statistics, calculus, analytical geometry, linear and matrix algebra. - Good knowledge of various parametric and non-parametric statistical methods (linear and logistic regression, SVM, Mean Shift, Cumulative density function approach, Decision trees, Neural Networks). Have experience of work with various Python libraries (numpy, scipy, pandas, scikit learn) and R package. - Excellent understanding of the principles of the operation of Neural Networks (including Convolutional and Recurrent) with experience of their practical implementation (using Tensor Flow and Keras framework). Well versed in many NN optimization methods: L1 and L2 regularization, dropout, artificial expansion of the training data, activation function types (sigmoid, softmax, tanh), various cost-function (quadratic, cross-entropy, exponential) and weight initialization approaches.