Technical Leader

Senior Software Engineer (Backend + Network)

Ho Chi Minh - Viet Nam

Product

• Backend
• Network

Continuously monitor and analyze new VPN providers, proxy services, and anonymization tools. Conduct investigations on IP allocation patterns, hosting provider behaviors, and network infrastructure changes. Develop and maintain comprehensive databases of known VPN/proxy IP ranges and behavioral signatures. Research emerging threats such as residential proxies, mobile proxies, and distributed proxy networks. Monitor darkweb marketplaces and security forums for emerging proxy/VPN trends. Perform deep packet analysis and network traffic pattern recognition. Develop and maintain the system using PHP, Python, and/or Go. Optimize VPN/Proxy detection algorithms. Design scalable infrastructure to handle millions of IP lookups per day. Implement monitoring and alerting systems for detection accuracy and system performance. Analyze production incidents related to false positives/negatives in threat detection. Collaborate with DevOps team on deployment of detection rule updates and model improvements. Investigate customer-reported bypass attempts and develop rapid response solutions. Provide technical expertise during customer security consultations. Support sales engineering team with technical demonstrations and proof-of-concepts. Document threat analysis findings and detection methodologies for internal and customer use. Maintain relationships with cybersecurity vendors, threat intelligence providers, and ISPs. Monitor industry threat reports, security advisories, and academic research. Participate in cybersecurity conferences and forums to stay current with the threat landscape. Contribute to open-source security tools and research when appropriate.

Negotiation

Team Lead Engineering (Crew team)

Ho Chi Minh - Viet Nam

Product - Booking Platform

• .NET
• ReactJS
• Azure

Negotiation

Full-stack Engineer

Ho Chi Minh - Viet Nam

Outsourcing

• .NET
• ReactJS

Develop scalable, maintainable full-stack solutions using C#/.NET on the backend and ReactJS (JavaScript/TypeScript) on the frontend Design, build, and integrate RESTful APIs and ensure smooth communication with client-side applications Implement responsive, user-friendly UIs using modern libraries (Tailwind, MUI, Ant Design, etc.) and effective state management (Jotai or similar) Ensure secure communication, authentication, and authorization across services following industry standards Write and maintain unit tests and integration tests to ensure reliability across the frontend and backend Collaborate closely with QA, frontend/backend engineers, and BA/POs through code reviews, pair programming, and knowledge-sharing Continuously improve code quality, performance, and scalability across the stack Maintain and update technical documentation for clarity and team alignment Stay up to date with emerging full-stack technologies to drive innovation and efficiency

Negotiation