Idrisa Mkuruzi

Managed database systems to ensure optimal performance and availability.

• High-Availability Administration: Managed large-scale, 24/7 mission-critical Oracle databases supporting enterprise telecom services to ensure maximum uptime.
• Performance Tuning: Optimised database performance using AWR/ASH reports and execution plans to resolve CPU, I/O, and contention bottlenecks.
• HA & Disaster Recovery: Designed Oracle RAC and Data Guard architectures for fault tolerance, load balancing, and automated disaster recovery.
• Backup & Recovery (RMAN): Executed RMAN backup, recovery, and archival strategies, integrating tape storage for compliance and optimised disk usage.
• Capacity & Lifecycle Planning: Led space management and data lifecycle strategies to support high-volume, continuously growing transactional systems.
• Database Solution Design: Built dedicated reporting and analytics platforms to isolate heavy workloads and accelerate operational query speeds.
• Deployments & Patching: Executed production upgrades, patch installations, and maintenance with minimal downtime and zero data loss.
• Proactive OEM Monitoring: Monitored system health via Oracle Enterprise Manager (OEM) to resolve potential incidents before impacting end users.
• Security & Access Control: Managed database privileges, roles, and security policies in alignment with enterprise compliance standards.

Managed mobile money application to ensure seamless transaction processing.

• Monitored high-volume mobile transactions and microservices, resolving Level 2/3 incidents and API failures to ensure uninterrupted service availability.
• Investigated transaction failures and banking integration errors through log analysis and DB queries to reduce mean time to recovery (MTTR).
• Database Management: Executed SQL queries to clear stuck transactions, fix data discrepancies, and support ledger reporting.
• Debugged REST/SOAP APIs for third-party merchants and banks to ensure secure payload delivery.
• Collaborated with DevOps on application patch deployments and conducted post-release testing to mitigate production issues.

• Routing & Switching Configuration: Configured and maintained core network devices, VLANs, subnetting, and dynamic routing protocols (OSPF, BGP) to support reliable data transport across multi-site environments.
• Monitored enterprise LAN/WAN infrastructure, routers, and firewalls in real time, ensuring high availability and optimal throughput to maintain sub-second network latency.
• Troubleshooting & Packet Analysis: Diagnosed network connectivity failures, packet loss, and latency bottlenecks using packet analyzers (Wireshark) and diagnostic CLI tools to maintain strict service uptime.
• Network Security & Firewalls: Managed firewall rules, Access Control Lists (ACLs), and VPN tunnels (IPsec/SSL) to enforce secure data transmission and protect network perimeters against unauthorized access.
• Performed routine router/switch firmware updates, network equipment patching, and bandwidth utilisation analysis to prevent bottlenecks and facilitate infrastructure growth.