Foto de capa do perfil
Você está agora seguindo
Erro seguindo usuário.
Esse usuários não permite que o sigam.
Você já está seguindo esse usuário.
Seu plano permite apenas 0 seguidas. Aprimore-o aqui.
Deixou de seguir com sucesso
Ocorreu um erro ao deixar de seguir o usuário.
Você recomendou com sucesso
Ocorreu um erro ao recomendar o usuário.
Algo deu errado. Por favor, atualize a página e tente novamente.
E-mail verificado com sucesso
Avatar do Usuário

Duong N.

@donhuan

5,0
25
5,6
5,6
100%

Information Security, C/C++, .NET, PHP, Python

$9 USD / hora
Bandeira do(a)
Vietnam (8:07 PM)
Entrou em fevereiro 21, 2011
$9 USD / hora
Information Security, Ethical Hacker, Penetration Testing, Network Security, Computer Security, Network Design, Network Administration, Software Development, Web Development.
Verificações
No prazo
73%
No orçamento
74%
Índice de aceitação
87%
Índice de recontratação
22%

Portfólio

Portfólio

4128346
4128311
4128292
4128286
4128278
4128274
4128346
4128311
4128292
4128286
4128278
4128274
Mudanças salvas
5.0 · 25 Reviews
Avaliações
Avatar do Usuário
He is a very talented developer. He works diligently and gets his work done on time. He also has great communication skills and keeps you updated regularly throughout the project. Highly Recommended!
Jason S.
@jasoncares
Bandeira do(a)
CHICAGO, United States
há 5 anos
Compartilhar
Avatar do Usuário
He is very knowledgeable in many different technologies. I work with him on a variety of projects. Highly recommended!
Jason S.
@jasoncares
Bandeira do(a)
CHICAGO, United States
há 6 anos
Compartilhar
Avatar do Usuário
He is a talented and dedicated developer. Highly recommended! [06 March, 2019] Very talented freelancer, highly recommended
Jason S.
@jasoncares
Bandeira do(a)
CHICAGO, United States
há 6 anos
Compartilhar
Avatar do Usuário
He knows what he is doing. Solved many issues for us on this project. Will use again for phase 2 of project.
Jason S.
@jasoncares
Bandeira do(a)
CHICAGO, United States
há 6 anos
Compartilhar
G
If you read this review. Do not let Do's quiet way of chatting fool you. I have been in network for 20 years. I have hired many Engineers. I am an Engineer myself . We are extending our team and took a chance with Do. The project was harder than we both thought. I even loss faith and brought many other people to look at it. None of them! Could figure it out or do the job. Do was confident and knows what he knows. He is also personable and what we wanted most of all communication. Any good review would not give Do justice. He also helped us out with a very good client. --- I will be hiring him as much as I can .
Shneur G.
@garbcg
Bandeira do(a)
Teaneck, United States
há 6 anos
Compartilhar
Experiência
System penetration testing
dez., 2016 - Presente
8 anos, 1 mês
Tienphong
dez., 2016 - Presente
8 anos, 1 mês
I have a big responsibility in protecting the information system (computer network, Voice IP network, data). I'm a leader of a security group who have to implement solutions to protect our IT system, such as: update devices, implement security configuration, do penetration testing all IT devices in our IT system.
dez., 2016 - Presente
8 anos, 1 mês
VNPT
set., 2012 - dez., 2016
4 anos, 3 meses
Application Security
mai., 2014 - dez., 2016
2 anos, 7 meses
In this period of time, I do application penetration. The purpose of my work is to find security vulnerabilities in applications (desktop applications and web applications) and fix them.
Network Security
set., 2012 - abr., 2014
1 ano, 7 meses
I worked as a security expert who implemented solutions to protect the computer network of my organization (install Firwall, IPS, IDS, Antivirus, Security Policies, NAC System, CA System). I also do task of a network administrator.
set., 2012 - dez., 2016
4 anos, 3 meses
Network Administration
out., 2011 - ago., 2012
10 meses
NetSolution
out., 2011 - ago., 2012
10 meses
In this period of time, I worked as a network administrator. In more detail, I install Servers (AD, DC, Database Server, Web Server, File Server, Proxy Server, Mail Server), config network devices (Cisco Router, Cisco Switch, Load Balancing devices, Wifi Access Point) and monitor the status of all devices in our network.
out., 2011 - ago., 2012
10 meses
Educação
Truòng Dai hoc Bách Khoa Hànôi
2005 - 2010
5 anos
5
Bandeira do(a)
Vietnam
2005 - 2010
5 anos
Qualificações
ACM ICPC (International Collegiate Programming Contest)
2010
ACM (Association for Computing Machinery)
The ACM ICPC (International Collegiate Programming Contest) is a sport programming world championship held annually
2010
Certified Ethical Hacker (CEH)
2015
EC-Council
Certified Ethical Hacker (CEH) is a qualification obtained by assessing the security of computer systems, using penetration testing techniques.
2015
Cisco Certified Network Professional (CCNP)
2014
Cisco
Cisco Certified Network Professional (CCNP) is an intermediate-level certification in the Cisco certified professional program. This certification is aimed at full-time network or system administrators, or those who work with local and/or wide-area network (LAN/WAN)infrastructure.
2014
Certificações
Basic Numeracy - Level 1
Basic Numeracy
Convite enviado com sucesso!
Obrigado! Te enviamos um link por e-mail para que você possa reivindicar seu crédito gratuito.
Algo deu errado ao enviar seu e-mail. Por favor, tente novamente.
Usuários Registrados Total de Trabalhos Publicados
Freelancer ® is a registered Trademark of Freelancer Technology Pty Limited (ACN 142 189 759)
Copyright © 2025 Freelancer Technology Pty Limited (ACN 142 189 759)
Carregando pré-visualização
Permissão concedida para Geolocalização.
Sua sessão expirou e você foi desconectado. Por favor, faça login novamente.