Se Yong Oh, Developer in Melbourne, Victoria, Australia
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Se Yong Oh

Verified Expert  in Engineering

Software Developer

Melbourne, Victoria, Australia
Toptal Member Since
November 21, 2022

Se Yong is a security architect with extensive experience in application development and IT operations. His expertise ranges from strategic leadership and project management to solution architecture and technical leadership. In addition, Se Yong has in-depth knowledge and experience with the Azure cloud and various Microsoft technologies. With his diverse skillset in IT and security, Se Yong would be a valuable addition to any engineering team.


Application Security, Security Architecture, Security Operations Centers (SOC)...
Victorian Electoral Commission
IT Governance, Management, Projects, IT Strategy, IT Services...
Victorian Electoral Commission
DevOps, Azure, Security Operations Centers (SOC), Incident Response...




Preferred Environment

.NET, Azure, Octopus Deploy, Python, Scrum Master, Security Architecture, Microsoft Power BI, IT Project Management, Software Development, IT Operations

The most amazing... I've built is a brand new security team, for which I devised and executed strategic and tactical plans.

Work Experience

Principal Security Engineer

2022 - PRESENT
  • Provided leadership in security for the financial services vertical, partnering with delivery and engineering managers to manage, control, and improve security controls around people, processes, and technology.
  • Set up a governance framework to oversee security risks and optimize resource utilization.
  • Developed a security metric to track security initiatives' progress.
  • Led workshops on threat modeling, security architecture, and secure software design and provided security reviews of solution designs.
  • Refreshed and reviewed the organization's information and cyber security strategy.
  • Established a minimum set of security requirements and a security scorecard to measure the risk of non-compliance.
Technologies: Application Security, Security Architecture, Security Operations Centers (SOC), Incident Response

Head of Technology

2021 - 2022
Victorian Electoral Commission
  • Provided technical leadership and guidance for development, operation, testing, and security teams to continuously improve the efficiency of the software development lifecycle.
  • Planned and managed capacity, growth, upskilling, and performance of development, operation, testing, and security teams.
  • Assisted departments in using technology to achieve their business goals.
  • Held the position of deputy CISO and chair of the security steering committee.
  • Developed the organization's cyber security strategy and oversaw implementation in collaboration with project managers, department heads, and third-party vendors.
  • Managed the organization's information and security risk profile.
  • Ensured compliance with Australian government security regulations, including the Victorian Protective Data Security Framework, Victorian Protective Data Security Standards, and Protective Security Policy Framework.
  • Provided guidance and advice to the project team as a member of the enterprise architecture board.
  • Oversaw the change and configuration management of ICT systems in collaboration with the change advisory board as an accountable technology approver.
Technologies: IT Governance, Management, Projects, IT Strategy, IT Services, IT Service Management (ITSM)

IT Security and DevOps Manager

2018 - 2021
Victorian Electoral Commission
  • Achieved operational and security stability of the infrastructure, platform, and services during the elections in 2018 and 2020.
  • Spearheaded a project to upgrade the standard operating environment to Windows 10, Microsoft 365, SharePoint Online, and Dynamics 365 to modernize the workspace.
  • Led a project to migrate the company's core business systems from the on-premises data center to the Azure cloud to enhance stability, scalability, and security.
  • Partnered with Telstra and led a project to enhance the corporate network and regional offices' remote networks across Victoria.
  • Ensured continuous compliance with regulations, including Victorian Protective Data Security Standards, Protective Security Policy Framework, and Victorian Protective Data Security Framework.
  • Represented the organization during successive internal and external security audits and managed and mitigated risk through projects.
Technologies: DevOps, Azure, Security Operations Centers (SOC), Incident Response, IT Operations, Security Management

Technical Lead

2017 - 2018
Victorian Electoral Commission
  • Managed software development teams and vendors to implement numerous software projects for the election.
  • Designed microservices architecture and converted monolithic applications into the new architecture to automate CI/CD and improve manageability.
  • Led the IT Operations team in implementing an infrastructure-as-a-code Docker hosting platform in Azure cloud.
  • Implemented DevOps practices and adopted cloud platforms to host the Victorian Electoral Commission's public-facing website for the first time.
  • Delivered the complete disaster-recovery solution leveraging Azure Site Recovery in collaboration with the business and a third-party vendor.
Technologies: React, .NET, C#, Windows Presentation Foundation (WPF), TFS, Azure DevOps, CI/CD Pipelines, Software Architecture

Senior Consultant

2015 - 2017
Telstra Purple
  • Consulted customers on better software development practices and helped the development team manage their code and packages as part of the software development lifecycle.
  • Implemented an automated build and deployment process for various software projects.
  • Developed platforms on the Azure cloud and trained customers in infrastructure-as-code management.
  • Provided training sessions and workshops with customers and fellow consultants, educating them on DevOps principles and its technologies to achieve high performance in software project delivery.
Technologies: DevOps, .NET, Azure, Front-end, Back-end, Architecture, Solution Design

Lead Developer

2012 - 2015
  • Led a team to develop and maintain software used to manage a large number of conference rooms and theatres with high-quality video communication.
  • Participated in R&D activities at Telstra Labs to develop new business solutions that integrate modern software-based video conferencing systems with traditional hardware-based systems like Cisco TelePresence and Polycom's RealPresence.
  • Developed multiple business cases with proof of concepts in software applications to help customers by collaborating with business development managers and assisting with pre-sales activities.
Technologies: .NET, C#, ASP.NET, TFS

Cyber Security Uplift

Managed internal and external security audits and led teams to remediate security vulnerabilities against known threats. The program met all the Australian state government's regulatory and legislative security requirements. My leadership over the two years resulted in the Victorian Electoral Commission lowering its security risk to an acceptable level.

Cloud Migration

Contributed to a cloud migration project by providing program management and technical leadership skills. The project was for a government organization that upgraded and migrated all legacy infrastructure to the Azure cloud. My work provided reliable and high-performance IT platforms during the state election in Victoria, Australia.


C#.NET, Python, C#


.NET, Windows Presentation Foundation (WPF), ASP.NET


Microsoft Power BI, TFS


Azure, Azure PaaS


Scrum Master, Application Security, Security Architecture, IT Project Management, Software Development, Containers, Octopus Deploy, IT Operations, Programming, Networking, Architecture, Software Design, Certified Information Systems Security Professional, Information Security, CISSP, CISM, Risk, IT Governance, Access Control, Identity, Security Testing, Security Management, Cloud Architecture, Cloud Security, Security Operations Centers (SOC), Incident Response, Projects, IT Strategy, IT Services, IT Service Management (ITSM), CI/CD Pipelines, Software Architecture, Front-end, Back-end, Solution Design, IT Projects, Resource Management, Security Policies & Procedures, Strategy




Agile, Scrum, DevOps, Azure DevOps, Management

2000 - 2003

Bachelor's Degree in Computer Science

UNSW Sydney - Sydney, Australia


Certified Information Security Manager (CISM)



Certified Information Systems Security Professional (CISSP)



Microsoft Certified: Azure Developer Associate



Microsoft Certified: Azure Security Engineer Associate



Microsoft Certified: DevOps Engineer Expert



Microsoft Certified: Azure Solutions Architect Expert



Professional Scrum Master I (PSM I)