Conducted simultaneously with undergraduate/graduate educations at multiple universities, resulting in the publication of two academic books 
 Computer forensics, AI, big data, signal/audio/speech/image processing, reverse engineering, cryptology, cyber security and interorganizational data communication 
 C/C++: Backend software for data processing and machine learning 
 C#/.NET/WINFORMS/GDI+/WPF: GUI development 
 Python: AI, R&D and data pre-processing 
 Java/Spring Boot: Recently used for RESTful services 
 Advanced algorithm design/analysis/optimization/concurrency/parallelization/complexity reduction 
 OOP in various design patterns/frameworks 
 Machine learning/classification for petabyte-scale/cumulative/real-time evolving datasets involving audio/image/meta/text data on high-load systems 
 Multithreading/OPENMP/CUDA 
 IBM Power Systems 
 Speech processing/enhancement for ASR/speaker identification 
 Face recognition 
 Porting/Re-implementing between C/C++/C#/Java/Python/Delphi 
 Disassembling/decompiling/reverse engineering/testing and improving of applications/libraries developed in C#/C/C++/Delphi 
 Decryption of data encrypted with basic cryptology algorithms without brute force attacks 
 Periodic AES/S-Box cryptanalysis under PhD supervision 
 Analyzer software for packet capture (PCAP) data/deep packet inspection/custom GSM-related binary files 
 Application-specific file carving/recovery/perceptual hashing algorithms 
 Data recovery algorithms for special file formats without header/footer 
 Text deasciifying/normalization/mining algorithms 
 Adapting JWT/cryptographic hashing/LDAP authentication 
 Additionally development of card pass/employee/salary/deduction/POS management software 
 Windows/Red Hat/Ubuntu/POSIX compliant systems 
 Oracle/MSSQL/FAISS/MILVUS/Redis/MongoDB 
 Database&Query optimization/SQL tuning/CSV-JSON-XML-XLSX parsing/reporting 
 TCP Socket/SOAP/REST/WCF services 
 Dlib/Keras/MXNet/TensorFlow/InsightFace/Kaldi/Sphinx/Whisper/FFMPEG 
 GitLab/YouTrack