Олександр

Alexander Shakhray
Senior Software Engineer | Data Engineer | Cloud Architect
Ukraine | [open contact info](look above in the "contact info" section) | LinkedIn: [open contact info](look above in the "contact info" section)

Summary
Software Engineer / Data Engineer with 20+ years of experience designing and scaling high-load,
data-intensive systems for retail, POS, and e-commerce. Strong SQL and database engineering
background across MS SQL, MySQL/MariaDB, PostgreSQL and BigQuery, including query optimization,
data modeling, OLTP/OLAP workloads and reporting assets.

Experience
Senior Software Developer | Data Engineer – DataMesh Group (2020–2026)
- Designed and scaled high-load POS and e-commerce systems handling large transactional volumes
- Achieved up to 10x query performance improvement through deep database optimization (indexes,
execution plans, schema tuning)
- Reduced cloud infrastructure costs by 70% through architecture optimization and resource tuning
- Built and maintained Node.js / Next.js applications with AWS integration (S3, ECS, EC2, SQS, RDS)
- Optimized large-scale transactional systems processing millions of records daily

Lead Software Engineer – Stall Square (2017–2020)
- Led development of a data-driven retail analytics platform
- Designed system architecture and data pipelines for large-scale analytics
- Worked with geospatial (GIS) and demographic datasets
- Delivered scalable backend services for analytics and reporting

Senior Software Engineer – Giggster (2016–2017)
- Built backend systems for a marketplace platform (Airbnb-like)
- Handled large-scale user-generated content and data processing
- Improved system performance and scalability

Senior Software Engineer – Postindustria (2008–2017)
- Developed enterprise-grade applications and backend systems
- Worked with high-load databases and long-term system architecture

Software Engineer – Kherson State University, Arisent (2005–2008)
- Internal enterprise systems, high-load databases

Skills
Node.js, Next.js, React.js, TypeScript, GraphQL, REST API, APIs
MariaDB (ColumnStore), MySQL, MS SQL, PostgreSQL, Clickhouse, BigQuery, OLAP, OLTP
AWS: ECS, EC2, S3, SES, CloudFront, RDS, DMS, WAF, Backup, SQS
Docker, Microservices, System Design
JavaScript, C#, PHP, C++, Python
Big Data, GIS, WordPress
Education
Kherson State University
Specialist Degree, Software Engineering

Academic Lyceum
Science & Mathematics Track