Semen Yefimenko

Migrated Azure DevOps pipelines to GitLab, improving developer experience and reducing deployment time. Integrated automated AI reviews and CVE fixings, and analyzed AWS costs to reduce operational costs by 50%.

Led migration of a monolith application from COBOL (NATURAL) to Java and AWS, designing scalable and fault-tolerant cloud solutions. Optimized cloud costs by 90% and achieved 99.9% system uptime post-migration.

Automated and optimized CI/CD pipeline, reducing deployment effort from 40 hours to 8 hours per week. Worked on cloud-based backend services to improve efficiency and scalability.

Implemented infrastructure automation with Ansible and monitoring solutions with ELK Stack. Managed big data analysis (300GB – 5TB) with RDF on relational databases and developed new REST APIs.

Developed a database migration tool enabling seamless data transfer across PostgreSQL, MSSQL, and Oracle. Built a database comparison tool for cross-platform data integrity checks and reduced costs by migrating applications away from Oracle licensing fees.

Built a data transformation tool to automate manual ETL pipelines, improving efficiency.

Earned the AWS Certified Developer Associate certification in February 2025.

Earned the AWS Certified AI Practitioner certification in February 2025.

Earned the AWS Certified Cloud Practitioner certification in September 2022.

Earned the AWS Certified Solutions Architect Associate certification in October 2022.

Earned the Oracle Certified Associate Java SE 8 Programmer certification in June 2019.

Completed training as a Specialist for System Integration from 2016 to 2018.