POSTED AT 05/08/2025 15:34:43
Network Security
Department
Security Dept
Location
Hanoi
Employment type
Full-time
Work experience
Experienced
End date
Application until 31/12/2026
Security
Overview
Viettel Cyber Security One Member Limited Liability Company (VCS) focuses on the implementation, research, and in-depth development of information security products and solutions, while also providing cybersecurity (CS) products and services to large domestic and international organizations and enterprises.
Some Notable Achievements Of VCS
- The Champion of Pwn2Own 2023 & 2024. Previously, VCS consistently ranked in the Top Five positions at Pwn2Own Tokyo 2020, Vancouver 2021, and Toronto 2022.
- In addition to Pwn2Own, VCS has consistently made its mark and topped numerous prestigious cybersecurity attack rankings and competitions worldwide, including those held by Microsoft, Bugcrowd, Google, Oracle, and others.
- VCS has exploited over 400 Zero-day security vulnerabilities on major platforms and systems of Microsoft, Oracle, Jenkins, and others.
- Received 11 awards at the Cybersecurity Excellence Awards 2023, surpassing more than 800 nominations from leading global cybersecurity solution providers.
- Global InfoSec Awards 2023 (Cyber Defense Magazine)
- IT World Awards 2023: https://globeeawards.com/technology/winners/
- Viettel Cyber Security excelled in achieving the Gold award in the Best Cyber Security Company in Asia category for 2023.
- 07 Gold awards for products: Network Security Monitoring Solution (VCS-CyM), Abnormal Behavior Analysis Solution (VCS-KIAN), Network Security Orchestration, Automation and Response Solution (VCS-CyCir), Endpoint Anomaly Detection Solution (VCS-aJiant), Secure Remote Working Solution for Enterprises (VCS M-Suite); Cyber Threat Intelligence Solution (VCS-Threat Intelligence); Network Security Vulnerability Management and Control Solution (VCS-V2S).
- 03 Gold award for services: Managed Security Services (MSS), Penetration Testing Service (Pentest), IoT Security Assessment Service.
Responsibilities
– Operate and monitor infrastructure for Information Security (IS) solutions provided to MASS/SME clients (e.g., WAF, Anti-DDoS). This includes ensuring service stability and security, and handling a full range of infrastructure-related incidents from basic to advanced.
– Optimize and upgrade the architectural design of IS solution infrastructure (WAF, Anti-DDoS, etc.) to ensure stability and scalability, meeting the business needs of MASS/SME clients.
– Handle DDoS and web attacks, ensuring compliance with client SLAs. This involves analyzing logs and utilizing Anti-DDoS and WAF solutions to defend against attacks.
– Participate in IS incident response drills for clients, specifically those related to web and DDoS attacks.
– Tune and update rules for IS solutions serving MASS/SME clients (e.g., WAF and Anti-DDoS).
– Research technologies and the latest optimization/defense techniques to improve and update solutions.
– Continuously update knowledge on new network security and web attack techniques, then develop defense strategies and optimize solutions accordingly.
Qualifications
– Bachelor's degree or higher in
Computer Science, Information Technology, Mathematics-Informatics, or related fields
– English proficiency equivalent to TOEIC 650 or higher
- Requirements/Competencies:
– 3+ years of experience in network or network security.
– Knowledge of
Linux servers, web servers, and virtualization systems like
VMware ESXi, vCenter, or similar.
– Knowledge of monitoring tools such as
Grafana, TICK, Prometheus, or equivalent.
– Basic understanding of
Cloud Computing, Docker, and Containers.
– Fundamental understanding of common web security risks based on the
OWASP Top 10.
– In-depth knowledge of DDoS attack types, from Layer 3, Layer 4 to Layer 7. You should regularly research and update new attack techniques to propose solutions that ensure client service availability.
– Understand the concepts and methods for
analyzing and monitoring network-level alerts and threats.
– Strong
teamwork skills and ability to work well under pressure.
– Good information-gathering skills.
– Excellent troubleshooting skills for network and network security issues, including the ability to analyze and handle vulnerabilities in a company's network system.
Benefits & perks
- Competitive annual total income package
- Opportunity to work with diverse domestic and international clients
- Annual salary review in March
- MIC health and personal accident insurance (coverage up to 600 million VND/year)
- Annual health check-up
- Awards recognizing performance and timely outstanding contributions
- 100% sponsorship for in-depth international professional certification based on position (in case of unsuccessful attempt, don't worry, VCS will support 50% of the exam fee), special bonuses for employees achieving international professional certifications
- Continuous investment in the latest and most up-to-date learning materials in the field of Information Security from leading global vendors and institutes
- 100% of employees are provided with an Udemy eLearning account – learn anytime, anywhere
- Free participation in professional knowledge sharing programs and seminars from leading domestic and international speakers
- Working in a Grade A office – Landmark 72 building with a green space complex and a private area for gym and entertainment (billiards, PES, café, reading, Pingpong)
- 30-minute relaxation daily with Happy hours (4:00 PM – 4:30 PM)
- Sports activities: Football, Billiards, Poker, PES clubs, etc
- 12 days of annual leave according to Labor Law and 3 days of company vacation, traditional holiday on 22/12
- Personal birthday celebrations: Gifts and birthday cake from the Company
- Participation in company events: Quarterly team building activities, monthly birthday celebrations, Year End Party, vacations, International Women's Day (March 8th), Vietnamese Women's Day (October 20th) (female employees recieve ½ day off), Viettel Group birthday on June 1st, etc
APPLICATION FORM
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In accordance with the provisions of the Law on Protection of Personal Data No. 91/2025/QH15 dated June 26, 2025, by checking the boxes below, the Candidate confirms that they have read, understood, and agree to allow Viettel Cyber Security One Member Limited Liability Company (VCS) to process their personal data for each specific purpose stated below. If the Candidate does not agree, we regret that we cannot process the application. The Candidate may withdraw their consent at any time through Customer Service channels, including the hotline +84 382 360 360 or email [Confidential Information].
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