Project Work
Experience

Senior DevOps Engineer / Infrastructure Manager

Resume-aligned responsibilities:

• Sole infrastructure owner for 11 non-prod and 2 prod environments; accountable for availability, patching, and compliance across 50+ Linux servers.
• Architected and automated end-to-end Terraform workflows to provision VPCs, subnets, security groups, NAT Gateways, VPC Endpoints, WAF, and EC2 across multiple environments, eliminating manual provisioning errors.
• Built and maintained GitLab CI/CD pipelines integrating SonarQube SAST and Fortify DAST, enforcing code-quality gates before every production deployment.
• Designed secure network architecture using layered controls: NACLs, security groups, IGW/NAT separation, and private VPC endpoints for AWS services.
• Led monthly patching cycles and OS upgrades across all environments, achieving zero unplanned outages during change windows.
• Deployed and operated ELK Stack with Elasticsearch, Logstash, Filebeat, and Kibana for centralised log management and proactive incident detection.
• Managed vertical and horizontal scaling operations; defined scaling runbooks adopted by the wider operations team.

Key achievements:

• Delivered a critical production service independently within the first 4 months, on time, with zero post-go-live P1 incidents.
• Commanded a PROD tech-refresh live event end-to-end, coordinating 6 cross-functional teams with zero production defects and zero rollbacks.
• Cut infrastructure costs by SGD 4,000/month through server right-sizing, automated start/stop schedules, and decommissioning redundant resources.
• Received formal client appreciation for measurably improving environment stability and security posture across all 13 environments.

Senior Associate - Infrastructure & DevOps

Resume-aligned responsibilities:

• Managed 25 multi-region environments across APAC, EMEA, and AMS, supporting tier-1 banking workloads with 99.9%+ availability SLAs.
• Developed Terraform modules and Shell/Python automation scripts adopted across multiple project teams, reducing provisioning time from days to under 2 hours.
• Built and maintained CI/CD pipelines on Jenkins with GitLab SCM, automating build, test, and deployment stages for 10+ microservices.
• Led middleware operations across WebLogic, WebSphere, JBoss, and IBM MQ clusters, including deployments, configuration management, and incident resolution.
• Drove capacity management and scaling strategies, both vertical and horizontal, ensuring zero performance breaches during peak business cycles.
• Owned incident, change, and patching operations; defined runbooks and standard operating procedures that reduced mean time to resolution by 30%.

Key achievements:

• Zero production defects across 4 consecutive years, recognised as the benchmark delivery standard within the account.
• Maintained top-8-of-10 performance rating consistently across 11 years, the highest sustained rating in the infrastructure team.
• Awarded Difference Maker Award three times and Star Team Award for outstanding cross-team delivery and technical leadership.
• Defined and documented implementation patterns for major infrastructure changes, with zero performance regressions recorded over 5+ years of adoption.

Programmer Analyst

Resume-aligned responsibilities:

• Developed, tested, and maintained enterprise software applications with end-to-end ownership from requirements through production release.
• Wrote Shell scripts and PL/SQL stored procedures for data processing and automation tasks supporting operations teams.
• Collaborated with architects and senior engineers to formulate application solutions from both technical and business perspectives.