Enterprise security platform (legacy architecture, production-critical environment).

• Production troubleshooting in high-load enterprise security systems
• Cross-layer debugging: Java, Linux, networking, certificates, permissions
• Analysis and modification of Python-based operational tooling (impctl)
• Oracle diagnostics (ORA error analysis, memory investigation, JVM troubleshooting)
• Investigation of overload scenarios and performance bottlenecks
• Controlled dependency upgrades in legacy codebase
• Resolution of client-critical incidents in security-sensitive environments- Cloud & virtualization platform integrations (vCenter / Azure / KVM / AWS)

Focus: reliability engineering, security hardening, modernization without production disruption.

Enterprise backup and replication platform.

• Backend development and feature implementation (Java)
• Performance improvements for recovery scripts (PowerShell / POSIX)- Active Directory integration
• Cloud & virtualization feature development (vCenter / Hyper-V / AWS)- Cross-platform tooling (Windows / Linux)
• Production stability improvements

Focus: enterprise data protection infrastructure and recovery reliability.

Enterprise multimedia and workflow platform (Terrasoft BPM Online).

• Led cross-functional development team (6 members)
• Coordinated architecture decisions and system integrations
• Oversaw BPM customizations and internal service development
• Managed delivery timelines and deployment cycles
• Implemented integration-heavy workflow solutions

Focus: integration architecture, team leadership, workflow automation systems.

Web client-banking platform for financial institutions.

• Designed and implemented backend architecture using Spring MVC + Spring Security
• Rewrote legacy servlet-based system
• Implemented role-based access control and SMS-confirmed transactions
• Integrated with external payment processing center
• Designed modular transaction structure (payments, templates, recurring operations)
• Built Ajax-driven interaction model

Focus: secure transaction systems, financial backend architecture, integration-heavy design.