Aleksandr Shelemetev /egno/

Profile

Experienced software engineer based in Bulgaria, with a career spanning multiple roles, including software developer, analyst, system administrator, DBA, and project manager since the 1990s. Holds an engineering degree (1994) and continually updates skills, most recently with Python, PostgreSQL, and Haskell.

Currently a Senior Software Engineer at Gcore, and actively studying Haskell through the University of Helsinki.

Technical Skills

Backend: Python, Django, Celery, Flask, asyncIO, Go, REST API, GraphQL, Java, Haskell, .NET, C++

Databases: SQL, PostgreSQL, MySQL, MS SQL, Oracle, PL/SQL, DBA, ClickHouse

DevOps: Docker, Kubernetes, DroneCI, CI/CD, Linux, Git, GitHub, GitLab, RabbitMQ, Redis, Cloud computing

Frontend: HTML, CSS, JavaScript, Node.js, Vue.js, Nuxt, Angular, d3js

Other Languages: VBA, Delphi, Pascal

Experience

Software Architecture & High-Load Systems

Extensive experience in designing, developing, and optimizing scalable, resilient architectures for high-load systems. Proficient in architectural patterns for distributed services, microservices, and performance-critical backends. Skilled at analyzing system bottlenecks and implementing solutions that improve throughput and reliability. Hands-on with technologies and practices supporting high availability and efficient scaling.

Industry Experience

Billing, Customer Service, Insurance, Logistics, Document Management

Acceleration of a bill calculation

Improved bill calculation performance by over 1000x and dramatically reduced database CPU utilization and lock contention.

DB CPU utilization was reduced

DB locks started to look insignificant

Acceleration of service activation

Reduced service activation time from over 10 minutes to just 4 seconds, greatly improving customer satisfaction.

After: