Sergej Ostashchuk

Freelance contractor, operating through an EU-registered limited liability company.

Architect - Central core cloud platform for a a leading global biotechnology company: - hybrid cloud architecture - design and implementation - technical leading - infrastructure as code - configuration - system integration - troubleshooting - operation Cloud platform core design, network architecture, global connectivity, VWAN, branch connectivity, ExpressRoute, VPN, Fortinet SD-WAN, routing, BGP, Palo Alto NGFW, Bastions, platform security, NSG, RBAC. Infrastrucure as code, Terraform, Azure DevOps.

Hands-on architect: big data and data science platform, DevOps, automation, security, identity and access management, configuration management, administration.

Big data solution architecture, design and implementation. Hortonworks Data Platform Certified Developer.

As Senior Software Engineer at beginning, later as Lead Software Engineer, I worked directly with several big telecom customers. I was responsible for requirement capturing, business analysis, solution design, system integration, implementation, all acceptances, going live, operation support. Main projects: Policy and Charging Control system for Orange Slovakia, Online Charging System for A1 Telekom Austria, Online Charging System for SiMobil Slovenia, Online Charging System for VipMobil Serbia

VAS & OSS/BSS design, implementation, integration, going live, operation support. Technical project management. Often acted as a bridge joining different technology and business-oriented departments (marketing, engineering, IS, core services, operations, customer care). Main projects : OTA handset configuration, IP television, Triple play, SMS/MMS gateways, Intranet portal, Oracle DWH, Oracle DB applications.