Serhii Korol
Senior Software Engineer
Experience
Senior Software Engineer
Kilwar LLC
- Developed and maintained high-performance Java-based financial applications, ensuring compliance with security and availability requirements.
- Led the Findur integration and optimization project, reducing processing time by 30% and enhancing system scalability.
- Designed and implemented CI/CD pipelines with Jenkins and GitHub Actions, reducing deployment time by 40%.
- Conducted performance testing and database optimizations to improve transaction efficiency and data retrieval.
- Collaborated with cross-functional teams in an Agile environment, implementing DevOps best practices.
Backend Developer
Eatcheap Agency
- Built and optimized enterprise banking applications using Java, Spring Boot, and Oracle RDBMS.
- Developed highly available and scalable services, ensuring system uptime of 99.99%.
- Led a data warehouse migration project, improving data retrieval speeds by 45%.
- Automated performance monitoring and error handling using Ansible and Terraform.
- Enhanced security measures, implementing OAuth, JWT, and API security protocols.
Software Engineer
NERDZZ Digitalagentur GmbH
- Spearheaded the migration of legacy services to containerized microservices in AWS (EKS, Lambda, API Gateway).
- Developed high-performance distributed event-driven systems with Kafka and RabbitMQ, improving message throughput by 20%.
- Integrated Cloud Native Application Protection Platforms (CNAPP) for Kubernetes security, enhancing system resilience.
- Built self-healing and autoscaling Kubernetes clusters, reducing operational downtime.
- Led architectural discussions and mentored engineers, driving innovation in the API and cloud computing space.
Software Engineer (Intern)
NUS Solutions Inc
- Developed and maintained scalable web applications using React.js, Next.js, and TypeScript, ensuring high performance and seamless user experience.
- Designed and implemented RESTful APIs and GraphQL endpoints to optimize data fetching and improve application efficiency.
- Integrated Redux for state management, enhancing application responsiveness and reducing load times.
- Spearheaded UI/UX improvements by implementing Tailwind CSS, Material UI, and custom component libraries, leading to a 30% increase in user engagement.
- Optimized frontend performance by implementing lazy loading, code splitting, and caching strategies.
- Collaborated closely with backend developers to integrate APIs, debug issues, and ensure smooth communication between frontend and backend.
- Led the migration of a legacy application to modern web technologies, improving maintainability and scalability.
- Implemented CI/CD pipelines (GitHub Actions, GitLab CI) to automate deployments and testing, reducing manual effort by 15%.
- Worked in an Agile/Scrum environment, participating in sprint planning, daily stand-ups, and code reviews.
Summary
With over 8 years of experience in backend and full-stack development, I specialize in designing, developing, and optimizing high-performance Java applications. My expertise spans financial technology platforms, RDBMS databases, and DevOps practices, enabling the development of scalable, secure, and resilient software solutions. I have a strong background in Java, Spring, SQL, and cloud-based architectures, with hands-on experience in Findur, Endur, and performance testing. A dedicated team player, I excel in Agile environments, contributing to test-driven development (TDD) and promoting continuous integration and deployment (CI/CD) methodologies.
Skills
Architecture
Integration Strategy
0 - 1 Product Development
Api Design And Development
Ui/ux Design And Development
Software Development
Global/local People Management (Onshore/offshore)
Product/project Collaboration
Process Structuration And Optimization
Executive Leadership
Continuous Improvements
Professional Devops Services
Backend Development: Java, Spring, Spring Boot, Hibernate, Rest Apis
Databases: Oracle Rdbms, Postgresql, Mysql, Sql, Data Warehousing
Devops & Ci/cd: Jenkins, Github Actions, Docker, Kubernetes, Terraform
Cloud Technologies: Aws (Ec2, Rds, Lambda, S3), Azure
Financial Technology: Findur, Endur, Financial Applications, Performance Testing
Software Development Practices: Agile, Scrum, Test-driven Development (Tdd), Clean Code
Version Control & Automation: Git, Gitlab, Bitbucket, Ansible, Ci/cd Pipelines
Languages
Education
University of Peloponnese
Bachelor’s degree · Computer Science and Mathematics · Greece
Certifications & licenses
Agile Development Certification
Institution of Peloponnese
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