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Karim
@mdkarim456
Level 2
QA Engineer, Penetration Tester and Website Security
Bangladesh
English, German, French, Italian, Spanish
About me
Manual QA Tester & Cybersecurity Specialist helping startups, SaaS founders, and agencies launch secure, bug-free, and user-ready products. Specialized in Manual QA Testing, Functional Testing, End-to-End Testing, Workflow Testing, SaaS Testing, Web Application Testing, AI Chatbot Testing, AI Integration Validation, VAPT, Penetration Testing, and Vulnerability Assessment. Experienced testing AI-built apps and websites developed with Lovable, Bolt, Cursor, Replit, v0, and other modern AI development tools with detailed bug reporting and security validation. Focused on real-user experience.
Skills
Karim
$14/hour
Offline •
Average response time: 1 hour
See my services
QA & Review
I will do manual QA testing for your website, web app, mobile app, saas, or software
Software Testing
I will do security testing for web applications and saas platforms
Want to work on an hourly basis?
Tell Karim what you need.
$14
/
hourPortfolio
Work experience
QA Engineer & Security Specialist
Fiverr Marketplace • Freelance
Jan 2025 - Present • 1 yr 7 mos
Providing manual QA testing, website security testing, vulnerability assessments, and malware cleanup for global clients. Delivering structured bug reports, test cases, and detailed security findings.
QA Engineer & Website Security Specialist
WebPremium Solution • Full-time
Jan 2023 - Dec 2024 • 1 yr 11 mos
Led QA processes, performed SaaS testing, mobile testing, API validation, malware removal, and WordPress security hardening. Delivered high-quality reports and ensured stable, secure product releases.
QA Engineer
Brain Station 23 • Full-time
Jan 2021 - Dec 2022 • 1 yr 11 mos
Conducted functional, regression, exploratory, and API testing for large-scale enterprise products. Improved software reliability through detailed bug reports and structured test cases integrated into Agile workflows.
49 Reviews
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
1-5 out of 49 Reviews
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Most relevant
ericmuria
Spain
Excellent QA work. Karim delivered an extremely thorough and well-structured test report — every bug included clear reproduction steps, expected vs. actual results, severity, and evidence (screenshots/videos), which made the fixing process fast and unambiguous. Great communication and responsiveness...
8 days
Duration
QA & Review
Seller's Response
Helpful?
richvara
United States
Ongoing collaboration
Karim is such an impressive app security engineer and has performed above all expectations and peers we made the decision to contract for monthly support moving forward. Excellent Service!!!
10 days
Duration
Software Testing
Seller's Response
Helpful?
pjcoorey231
Australia
Ongoing collaboration
Working with this developer has been an outstanding experience from start to finish. They have been incredibly professional, responsive, and thorough, consistently going above and beyond to understand the project properly and deliver high-quality work. What stood out most was their attention to detail,...
5 days
Duration
Software Testing
Seller's Response
Helpful?
olilou
Haiti
Ongoing collaboration
I had a great experience working with Karim. He completed both security testing and QA testing for my project and did an excellent job. He was professional, detail oriented, and very thorough in identifying issues, checking functionality, and helping improve the overall quality and security of the platform. His...
4 days
Duration
Software Testing
Seller's Response
Helpful?
brotto
United States
I got exactly what I was looking for and the service was above and beyond. I appreciated every moment of working with Karim. I would work with him again and recommend him to anyone.
13 days
Duration
Software Testing
Seller's Response
Helpful?
