David Wainaina

- Resolve escalated, complex issues involving GitLab self-managed (Omnibus & cloud-native), GitLab.com SaaS, Kubernetes, Docker, and CI/CD pipelines
- Maintained 100% CSAT across 1500+ resolved cases, among the highest-volume resolvers on the team
- Served as Gitaly Support Stable Counterpart — the designated specialist bridging Support and the Gitaly engineering team for repository storage, repli

- Resolve escalated, complex issues involving GitLab self-managed (Omnibus & cloud-native), GitLab.com SaaS, Kubernetes, Docker, and CI/CD pipelines
- Maintained 100% CSAT across 1500+ resolved cases, among the highest-volume resolvers on the team
- Served as Gitaly Support Stable Counterpart — the designated specialist bridging Support and the Gitaly engineering team for repository storage, repli

- Diagnosed and fixed product bugs with code contributions merged into the GitLab codebase, alongside merged documentation improvements
- Authored the team's Database Migration Runbook, now the standard reference for resolving stalled or failed database migrations during GitLab upgrades
- Mentor engineers on Gitaly, Geo replication, and database internals; contribute to technical hiring as an inte

- Diagnosed and fixed product bugs with code contributions merged into the GitLab codebase, alongside merged documentation improvements
- Authored the team's Database Migration Runbook, now the standard reference for resolving stalled or failed database migrations during GitLab upgrades
- Mentor engineers on Gitaly, Geo replication, and database internals; contribute to technical hiring as an inte

- Delivered L2 support for the Optiva (Redknee) Charging Engine and Total Converged Billing platform to a base of 70+ communication service providers across 40+ countries, including Digicel, Telus, and Vodacom
- Performed advanced troubleshooting at the Java code level — thread dumps, GC logs, performance measurements, and application debug traces — to root-cause customer-impacting production issu

- Delivered L2 support for the Optiva (Redknee) Charging Engine and Total Converged Billing platform to a base of 70+ communication service providers across 40+ countries, including Digicel, Telus, and Vodacom
- Performed advanced troubleshooting at the Java code level — thread dumps, GC logs, performance measurements, and application debug traces — to root-cause customer-impacting production issu

- Operated production SaaS environments for the Aurea/ESW portfolio — Aurea, Ignite, Versata, and DevFactory products — ensuring uptime for global enterprise customers
- Administered AWS infrastructure across EC2, VPC/VPN networking, and storage tiers (EBS, S3, Glacier); managed containerized workloads on Kubernetes and Docker
- Authored operational runbooks that enabled engineers to resolve recur

- Operated production SaaS environments for the Aurea/ESW portfolio — Aurea, Ignite, Versata, and DevFactory products — ensuring uptime for global enterprise customers
- Administered AWS infrastructure across EC2, VPC/VPN networking, and storage tiers (EBS, S3, Glacier); managed containerized workloads on Kubernetes and Docker
- Authored operational runbooks that enabled engineers to resolve recur

- Delivered end-to-end implementation, integration, and go-live of the mobile money platform with carrier wallets for Airtel Ghana and MTN Ghana, executing projects both onsite and offsite
- Ran UAT and SIT cycles with clients through to sign-off; configured and patched applications, MPOS and Famoco NFC devices, and trained mobile money agents on NFC payments
- Built and operated pre-production la

- Delivered end-to-end implementation, integration, and go-live of the mobile money platform with carrier wallets for Airtel Ghana and MTN Ghana, executing projects both onsite and offsite
- Ran UAT and SIT cycles with clients through to sign-off; configured and patched applications, MPOS and Famoco NFC devices, and trained mobile money agents on NFC payments
- Built and operated pre-production la

- Led onsite migration of production Mobiquity mobile money databases from Windows single-instance Oracle to Linux-based Oracle RAC clusters for Airtel operations in Uganda, Madagascar, Gabon, Burkina Faso, and DR Congo, executing within planned downtime windows
- Administered 20+ production databases in HA Oracle estates across Airtel Africa — RAC, Data Guard, ASM, RMAN — covering installation, u

- Led onsite migration of production Mobiquity mobile money databases from Windows single-instance Oracle to Linux-based Oracle RAC clusters for Airtel operations in Uganda, Madagascar, Gabon, Burkina Faso, and DR Congo, executing within planned downtime windows
- Administered 20+ production databases in HA Oracle estates across Airtel Africa — RAC, Data Guard, ASM, RMAN — covering installation, u

- Embedded onsite at Airtel Kenya, administering Linux servers hosting telecom VAS applications — OS installation, SSH/network/SMTP configuration, and the application stack (Glassfish, Apache, MySQL, Nagios)
- Automated health checks across telecom applications and servers, plus generation and transfer of CDR/event-record reports to external systems — eliminating manual daily reporting for all VAS

- Embedded onsite at Airtel Kenya, administering Linux servers hosting telecom VAS applications — OS installation, SSH/network/SMTP configuration, and the application stack (Glassfish, Apache, MySQL, Nagios)
- Automated health checks across telecom applications and servers, plus generation and transfer of CDR/event-record reports to external systems — eliminating manual daily reporting for all VAS

- Developed USSD, prepaid, and postpaid promotion solutions for Airtel Africa at an open-source telecom VAS company, including the Airtel Kenya main USSD menu (*111#), broadband bundle registration (*180#), BlackBerry/FB-Chat configuration service (*408#), and support for Airtel Zawadi (*796#)
- Built and supported USSD gateways and developed APIs integrating VAS services with core telecom systems

- Developed USSD, prepaid, and postpaid promotion solutions for Airtel Africa at an open-source telecom VAS company, including the Airtel Kenya main USSD menu (*111#), broadband bundle registration (*180#), BlackBerry/FB-Chat configuration service (*408#), and support for Airtel Zawadi (*796#)
- Built and supported USSD gateways and developed APIs integrating VAS services with core telecom systems

- Developed VAS applications — high-availability USSD, SMS, and MMSC solutions — with billing integrations for both prepaid and postpaid telecom customers
- Delivered payment gateway integrations with M-Pesa, Pesapal, Kopokopo, Fulusi, YO, and Interswitch, including web billing solutions for local businesses
- Notable projects: Oxygen — Safaricom betting USSD interface; CreditSwitch Nigeria — airt

- Developed VAS applications — high-availability USSD, SMS, and MMSC solutions — with billing integrations for both prepaid and postpaid telecom customers
- Delivered payment gateway integrations with M-Pesa, Pesapal, Kopokopo, Fulusi, YO, and Interswitch, including web billing solutions for local businesses
- Notable projects: Oxygen — Safaricom betting USSD interface; CreditSwitch Nigeria — airt

Responsible for:

- Installing the operating system and also any supporting software’s
- Dealing with troubleshooting software and hardware failure.
- Dealing with data security and recovery.
- Training individuals on new features in new Softwares in the market.
- Hardware and Pc Maintenances
- Data backup

Responsible for:

- Installing the operating system and also any supporting software’s
- Dealing with troubleshooting software and hardware failure.
- Dealing with data security and recovery.
- Training individuals on new features in new Softwares in the market.
- Hardware and Pc Maintenances
- Data backup

Duties and responsibility:
- Web development and programming
- Phone network setup
- Linux Administration
- Mail and Telephony support
- Python Programming
- JavaScript development and HTML Templates
- Troubleshooting and ensuring internet functionality

Duties and responsibility:
- Web development and programming
- Phone network setup
- Linux Administration
- Mail and Telephony support
- Python Programming
- JavaScript development and HTML Templates
- Troubleshooting and ensuring internet functionality

Grade: Second Class Honors Upper Division

Pursued a Bachelor of Business Information Technology, graduating with Second Class Honors (Upper Division).