Sumith Subasinghe

Experience

• 

  Sri Lanka Telecom Services

  Jul 2007 - Mar 2009

  Technical Officer

  Projects:Barthi Airtel Lanka (pvt) Ltd: Mail Server (Sendmail), Proxy Server (Squid), File Server, Active Directory (Windows server 2003).People’s Bank: Mail Server (Sendmail), Gateway Level Security for Mail server (Linux).Road Development Authority: Mail Server (Sendmail), Gateway Level Security for Mail server (Linux), Proxy Server (Squid), Active Directory (Windows server 2003), Antivirus Server (Kaspersky).Urbanlanka Development Authority: Mail Server (Sendmail), Proxy Server (Squid), Active Directory (Windows 2003), Antivirus Server (Kaspersky).Insurance Board of Sri Lanka: Mail Server (Sendmail), Proxy Server (Squid), Active Directory (Windows 2003).Tudawe Brothers: Mail Server (Sendmail), Gateway Level Security for Mail server (Linux).Vision Care (pvt) Ltd: Mail Server (Sendmail), Gateway Level Security for Mail server (Linux).Tajima Colombo (pvt) Ltd: Mail Server (Sendmail), Gateway Level Security for Mail server (Linux).ACILS: Mail Server (Sendmail), Gateway Level Security for Mail server (Linux). Show less

• 

  - Freelancer

  Mar 2009 - Dec 2009

  Freelancer

  People’s Merchant Bank: Mail Server (postfix Multiple Domains), Active Directory (Windows 2003/2008).Edna Group: Mail Server (Postfix Multiple Domains), Gateway Level Security Server for Multiple Domains Mail Server.Academy of Design: Proxy Server, Samba server, Configured Payment Gateway.Sudath Perera Associates: Mail Server (postfix Multiple Domains)

• 

  Bio Foods (Pvt) Ltd

  Jan 2010 - May 2011

  System Administrator (Linux)

  Provide support for Linux Servers/Desktop Users and Windows Users• Strong technical competencies in RHEL | Windows AD | Fedora Linux,• Installation/administration of Backup (NAS), Proxy (Squid), OpenVPN, File Server (Samba)and Firewall (IPTABLES) services.

• 

  Informatics (Pvt) Limited

  May 2011 - Oct 2013

   Provide 1st line support on application and infrastructure to Enterprise Customers. Manage customer calls after office hours and provide technical support. Carry out new installation, system integration and configuration tasks and POC's Carry out new installations, system integration and configuration tasks and POC's & provide 1st line support on application and infrastructure services.• Strong technical competencies (RHEL|OEL| Solaris Container| VMware| HP-ServiceGuard) in supporting implementation/incident and troubleshooting,• Worked as On-Site Support Engineer at Wataniya Telecom Maldives.

  • Asst Team Lead Enterprise Services - Linux & Unix

    Jul 2012 - Oct 2013

  • Systems Engineer

    May 2011 - Jul 2012
• 

  Colombo Stock Exchange

  Oct 2013 - Mar 2017

  Senior Systems Engineer

  Accountable for identifying and mitigating risks to Exchange application & proactively address and resolving issues without impacting service levels of Exchange application.• Strong technical (RHEL| SLES, Oracle DB, Weblogic, OID) /analytical competencies in supporting, incident handling and troubleshooting,• Conducting Live DR activity & perform release management/BAU operation on PROD/Non-PROD environments.

• 

  Virtusa

  Mar 2017 - Aug 2019

  Lead Consultant-Specialist (Infrastructure)

  • Worked as Tech Lead on CSG International (GLOBAL),Provided (Onsite & Offshore) technical implementation & operational support for MTN Group Limited (South Africa) in DEV, QA, SIT, Pre-PROD, PROD & DR environments.• Oracle Weblogic, OSB, managed servers, JMS & JDBC & SSL configs,• Used WLST/bash scripting for alert generation & Dynatrace integration,• Followed ITIL framework for incidents/ release management.

• 

  Colombo Stock Exchange

  Aug 2019 - May 2022

  Act as a point of technical escalation to external vendors/partners in supporting trading, analytics, risk and data services of Exchange application..• Strong technical (RHEL|OEL, OVM, Oracle DB, Weblogic, OID) /analytical competencies in supporting incident handling and troubleshooting.• Conducting Live DR activity & lead team for release management/BAU operation on PROD/Non-PROD environments.

  • Senior Technical Lead - Systems Operations

    Feb 2022 - May 2022

  • Technical Lead - Systems Operations

    Aug 2019 - May 2022
• 

  Circles

  May 2022 - Mar 2024

  Worked as part of Site Reliability Engineering (SRE) Team & Leads 5 members team. Experience in managing/provisioning instances both in the Data Center (Storages, SAN, Routers, Switches, Netbackup, firewall -Fortinet & Oracle VM env) & Cloud infrastructure in AWS & GCP.Automated the front-ends platforms into highly scalable, consistent, repeatable infrastructure using Ansible and Terraform.Maintained the Identity and Access Management, VPC, Load Balancing, Elastic Computing, S3 storage services, RDS in AWS cloud and relevant components in Google Cloud Platform (GCP).Launching Amazon EC2/ GCP VM Instances/ Physical servers, KVM virtualized VMs (Oracle VM) and Configuring launched instances with respect to specific applications.Maintained Infrastructure observability using Grafana, Oracle EM & FreeIPA as Identity and Authentication solution for Linux/UNIX networked environmentsExperience in Infrastructure vulnerability remediation using Ansible and protecting the web application using Cloudflare WAF for enterprise products and software stacks upon the recommendation of the cyber-security & internal/external audit.Provide L3 support and actively engage in managing incident logging, resolving issues, root cause analysis reports in application and network ecosystem along with other teams.Troubleshooting deployment, infrastructure and start up issues on various application server's product line in staging, pre-prod and production environments.Timely resolution of internal end user AdHoc requests which includes but not limited to: Cloud services, Operating system, end user applications or hardware, network, VPN connectivity, SSL & Domain name renewals.Manage product vendors, local and principal support partners, system integrators to ensure lesser values of time to market. Show less

  • SysOps Lead

    Nov 2022 - Mar 2024

  • Senior SysOps Engineer

    May 2022 - Nov 2022