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I will do web app penetration testing, owasp audit, and fix xss, sql injection
Sentinel O.
About this gig
I will do web app penetration testing, OWASP audit, and fix xss, sql injection
Your website is only as strong as its weakest security gap.
Even a small vulnerability can let attackers:
- Steal user or customer data
- Inject malicious scripts into your pages
- Deface your website
- Compromise your database
I'm a CEH & CompTIA Security+ certified developer offering penetration testing, OWASP Top 10 vulnerability assessment, and hands-on fixes so your site works AND holds up under attack.
Whether your site was recently hacked or you just want to catch issues before an attacker does, I find the real problem and fix it at the root.
WHAT I FIX:
- XSS (Cross-Site Scripting)
- CSRF attacks
- SQL Injection vulnerabilities
- Broken authentication & session issues
- Insecure APIs
- Missing security headers
- Exposed sensitive data
- General bugs & broken functionality
WHAT YOU GET:
- Full penetration testing & OWASP-based vulnerability assessment of your application
- Detailed report with severity ratings
- Issues fixed directly in your codebase
- Secure authentication improvements
- Best-practice recommendations to prevent future issues
Message me with your issue before ordering so I can scope it accurately.
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Get to know Sentinel O.
Sentinel O.
Full Stack Developer and Security Engineer
- FromNigeria
- Member sinceJun 2026
- Avg. response time1 hour
- Last delivery1 month
Languages
English, French, Spanish, Dutch, German
I am a Full Stack Web Developer with strong expertise in Cybersecurity, helping businesses, startups, and individuals create modern web applications that are not only beautiful but also protected against real-world threats.
-------- OFFERS ------------
-- Responsive and modern website
-- Landing pages, portfolio, E-commerce websites
-- API integration & development
-- Performance optimization
-- React, Nextjs, Vuejs, Framer Motion, Threejs
--- CYBERSECURITY SERVICES
-- Website security audit
-- Fixing security issues (XSS, CSRF, SQLI, OWASP )
-- API security
-- Code review for security.
My Portfolio
FAQ
Can you guarantee my website will be 100% secure?
Security is never “100% guaranteed” because new vulnerabilities can appear over time. However, I will remove known vulnerabilities, harden your system, and significantly reduce attack risks using industry best practices.
Do you remove malware or hacked files?
Yes — in the Premium package, I can clean infected files, remove malicious scripts, and restore your website integrity.
Will you improve my website performance too?
Yes, in addition to security fixes, I may also: Optimize backend performance Improve API response security Clean unnecessary vulnerable code
Will I get a report after the work?
Yes. You will receive a summary report of vulnerabilities found and fixed, plus recommendations for future protection.
What security issues can you fix?
I can fix: XSS (Cross-Site Scripting) SQL Injection CSRF attacks Broken authentication Insecure APIs Exposed sensitive data Weak security configurations
