⭐️⭐⭐️⭐️⭐️Most penetration testers give you 𝐚𝐮𝐭𝐨𝐦𝐚𝐭𝐞𝐝 𝐬𝐜𝐚𝐧𝐧𝐞𝐫 𝐫𝐞𝐩𝐨𝐫𝐭𝐬 𝐟𝐢𝐥𝐥𝐞𝐝 𝐰𝐢𝐭𝐡 𝐧𝐨𝐢𝐬𝐞. I deliver 𝐫𝐞𝐚𝐥, 𝐞𝐱𝐩𝐥𝐨𝐢𝐭𝐚𝐛𝐥𝐞 𝐯𝐮𝐥𝐧𝐞𝐫𝐚𝐛𝐢𝐥𝐢𝐭𝐢𝐞𝐬 with 𝐜𝐫𝐲𝐬𝐭𝐚𝐥-𝐜𝐥𝐞𝐚𝐫 𝐏𝐫𝐨𝐨𝐟 𝐨𝐟 𝐂𝐨𝐧𝐜𝐞𝐩𝐭𝐬 and 𝐬𝐭𝐞𝐩-𝐛𝐲-𝐬𝐭𝐞𝐩 𝐫𝐞𝐦𝐞𝐝𝐢𝐚𝐭𝐢𝐨𝐧 𝐠𝐮𝐢𝐝𝐚𝐧𝐜𝐞 - the exact flaws attackers would use to break your system.
𝐈’𝐦 𝐧𝐞𝐰 𝐭𝐨 𝐔𝐩𝐰𝐨𝐫𝐤 ⭐️𝐛𝐮𝐭 𝐚𝐬 𝐚 𝐂𝐲𝐛𝐞𝐫𝐬𝐞𝐜𝐮𝐫𝐢𝐭𝐲 𝐄𝐱𝐩𝐞𝐫𝐭⭐️𝐏𝐞𝐧𝐞𝐭𝐫𝐚𝐭𝐢𝐨𝐧 𝐓𝐞𝐬𝐭𝐞𝐫 𝐰𝐢𝐭𝐡 𝟏2+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐩𝐫𝐚𝐜𝐭𝐢𝐜𝐚𝐥 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞⭐️
💡 Why Me
🌍 ✔ 663+ clients in 36 countries, 12+ years experience
🛡️ ✔ Findings that prevent breaches & support compliance
👨💻 ✔ Developer-friendly remediation & free retesting
🔄 ✔ ~80% repeat clients
I am a Senior Penetration Tester & Security Consultant with more than 12 years of practical cybersecurity experience. Over this time, I have successfully delivered 660+ projects in 36 countries and built long-term partnerships with companies of all sizes - from early-stage startups to enterprise-level organizations. My clients trust me because I don’t just list vulnerabilities: I make sure they are fixed, retested, and completely closed. This is why I maintain an exceptional ~80% client return rate.
I’ve helped organizations in FinTech, e-Commerce, Healthcare, SaaS, Blockchain, and Government industries protect sensitive data, meet compliance requirements, and maintain customer trust. My security assessments have directly prevented breaches, helped companies secure investments, and supported successful audit certifications such as SOC2, HIPAA, and ISO27001 readiness.
🛡️ My Core Expertise
I provide a full spectrum of offensive and defensive security services:
🔹 Web Application Penetration Testing
Manual and automated testing for vulnerabilities like SQL Injection, Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), Remote Code Execution (RCE), Insecure Direct Object Reference (IDOR), Local/Remote File Inclusion (LFI/RFI), authentication & authorization flaws, business logic vulnerabilities, and misconfigurations.
🔹 Mobile Application Security (Android & iOS)
Reverse engineering, static and dynamic analysis, testing data storage protections, API communication security, and exploitation of insecure permissions or misconfigurations.
🔹 Cloud Security Assessments (AWS, Azure, GCP)
IAM misconfigurations, insecure storage buckets, weak API protections, Kubernetes & container orchestration security, serverless architecture hardening, and compliance readiness.
🔹 Smart Contract Security Audits (Solidity / EVM)
Analysis of reentrancy issues, integer overflow/underflow, unchecked external calls, logic vulnerabilities, and economic flaws that could lead to devastating exploits.
🔹 Infrastructure & Network Penetration Testing
External and internal testing for weak services, open ports, privilege escalation, VPN & firewall bypasses, and lateral movement simulation.
🔹 Code Review (SAST/DAST + manual)
Deep review of source code to detect insecure coding practices and logic errors before they reach production.
🔹 Incident Response & Forensics
Rapid response to active breaches, malware analysis, and post-incident hardening to prevent recurrence.
✅ Results I Deliver
- When you work with me, you don’t just get a report - you get tangible outcomes:
- Actionable PoCs → Every vulnerability is proven with working exploits, screenshots, and technical detail.
- Prioritized Remediation → I rank vulnerabilities by real-world risk and business impact so your team knows what to fix first.
- Executive Summaries → Easy-to-understand reports for stakeholders, investors, or compliance auditors.
- Free Retesting → After you fix issues, I verify that vulnerabilities are fully patched.
- Reduced Risk Exposure → My clients have prevented multi-million-dollar losses by patching critical flaws I discovered.
🏆 Track Record
1. Helped a FinTech startup secure $20M funding by fixing AWS & web flaws pre-SOC2 audit.
2. Discovered and patched critical smart contract bugs before launch.
3. Enabled a healthcare SaaS to pass HIPAA by closing PHI exposures.
4. Cut remediation time by 40% with clear PoCs & prioritized fixes.
5. Prevented severe breaches for an e-commerce platform during peak sales.
⚙️ How I Work
1️⃣ Scope & NDA → goals & rules
2️⃣ Recon → OSINT, surface mapping
3️⃣ Exploitation → manual + automation
4️⃣ Reporting → PoCs + executive summary
5️⃣ Retesting → free verification
6️⃣ Guidance → long-term security
🧰 Tools & Skills
Burp Suite, Nmap, Metasploit, Wireshark, OWASP ZAP, custom scripts | OWASP, PTES, MITRE ATT&CK | OSCP, CEH, CompTIA Security+, CISSP-level expertise.
✨ Final Note
I don’t just scan - I prove, fix, and retest vulnerabilities until closure.
🚀 Let’s secure your app, cloud, or smart contract today. Send me your scope for a tailored plan within hours. 💬
Cybersecurity Expert Cybersecurity Expert Cybersecurity
Penetration Testing
Ethical Hacking
Information Security
Network Penetration Testing
Network Security
Vulnerability Assessment
Web App Penetration Testing
Database Security
Security Testing
Source Code Scanning
System Security
Web Application Firewall
Cybersecurity Management
Cybersecurity Monitoring
ISO 27001
Cloud Security
Website Security
Application Security
Mobile App Testing
API Testing
Volodymyr S.
Lviv, Ukraine
$25/hr
5.0
5 jobs
Still searching for an experienced QA Tester, QA Engineer, Security Engineer, or Penetration Tester? Let’s save your time and talk 😉
I’m a QA Tester / QA Engineer with 10+ years of experience in manual testing, QA automation, security testing, penetration testing support, and overall product quality assurance across web, mobile, SaaS, fintech, healthcare, cybersecurity, AI/ML, and enterprise platforms.
I help teams test faster, release with confidence, automate repetitive testing processes, and catch critical bugs, security risks, and performance issues before they reach real users.
My work combines a strong QA mindset with practical Automation, Playwright expertise, API testing experience, and a security-focused approach. I don’t just click through screens and report obvious issues — I analyze how the product behaves, how the system is built, where integrations may fail, and where vulnerabilities may hide.
✅ Tools and Libraries
✔ QA Automation: Playwright, Cypress, Selenium, Appium
✔ API Testing: Postman, REST Assured, Supertest
✔ Security Testing: OWASP ZAP, Burp Suite, DevTools, custom scripts
✔ Performance Testing: JMeter, LoadRunner
✔ CI/CD Integration: GitHub Actions, GitLab CI/CD, Jenkins
✔ Bug Tracking & Test Management: TestRail, Zephyr, Jira, Trello, TestomatIO
✔ Reporting: Allure, Mochawesome
✔ Accessibility Testing: axe-core, Lighthouse, manual accessibility review
✔ Version Control: Git, GitHub, GitLab, Bitbucket
✅ Certifications and Experience
📌 ISTQB Certified QA Tester — strong foundation in QA methodologies, structured test design, test planning, test execution, and quality processes.
📌 Security-Focused QA Experience — practical experience with security QA testing, penetration testing support, vulnerability validation, OWASP-based checks, and secure product delivery.
📌 Domain Experience — Fintech, Cybersecurity, Healthcare, Marketing, Construction, Telecommunications, Real Estate, AI/ML, Logistics, E-commerce, SaaS, and 20+ other industries.
📌 QA Leadership — mentoring junior testers, building QA automation workflows, improving test strategies, preparing detailed test plans, and setting up scalable QA processes for complex products.
📌 Automation Expertise — hands-on experience building automation frameworks, especially with Playwright, Cypress, Selenium, and Appium, to support fast and stable product releases.
✅ What I’ve Been Responsible For as a QA Tester / QA Engineer
• Manual QA Tester: validating product flows, business logic, UI behavior, and edge cases
• Automation Tester: building stable and maintainable automation frameworks
• Playwright Automation Engineer: creating end-to-end test suites and cross-browser automation
• API QA Tester: validating endpoints, integrations, authentication, and secure data flow
• Security Engineer: identifying risks, testing access control, and supporting safer releases
• Penetration Tester: checking web applications for common vulnerabilities and security gaps
• Cross-Browser QA Tester: ensuring smooth behavior across browsers, devices, and screen sizes
• Accessibility QA Tester: using manual checks and tools like axe-core to support compliance
• Mobile QA Tester: full-cycle mobile app test coverage for iOS and Android
• Regression QA Tester: protecting existing functionality during new releases
• Performance QA Tester: checking speed, load handling, and system stability
✅ How I Can Help Your Team
I can help you:
• Find critical bugs before your users do
• Set up QA automation from scratch
• Improve existing Playwright, Cypress, or Selenium tests
• Create regression test coverage for fast-moving products
• Validate APIs, integrations, and backend logic
• Support security testing and penetration testing efforts
• Improve release quality and reduce production issues
• Build clear QA documentation and test plans
• Integrate automated tests into CI/CD pipelines
• Make your product more stable, secure, and user-friendly
Whether you need a QA Tester, QA Engineer, Automation Tester, Playwright expert, Security Engineer, or Penetration Tester, I can step in and help your team ship with more confidence.
Let’s connect and discuss how I can help improve your product quality, QA and automation coverage, and security testing process.
Test Results & Analysis
Functional Testing
API Testing
QA Engineering
Bug Tracking & Reports
Automated Testing
Alpha Testing
Software QA
Testing
Beta Testing
Mobile App Testing
Software Testing
Test Case Design
User Acceptance Testing
Game Testing
Usability Testing
Jira
Quality Assurance
Manual Testing
Web Testing
Volodymyr Z.
Kyiv, Ukraine
$35/hr
4.9
77 jobs
I’m an eWPTX-certified Cybersecurity Consultant with a Bachelor’s degree in Cybersecurity and over 10 years of hands-on experience in application security, helping organisations identify vulnerabilities across web applications, mobile apps, APIs, cloud environments, and IoT/embedded systems.
I help companies identify real vulnerabilities in their systems and understand how they can be exploited, not just theoretically, but in practice. My focus is on manual, attacker-driven testing aligned with OWASP Top 10 and beyond, with clear, actionable outcomes for your team.
I’ve worked with SaaS platforms, multi-tenant systems, and applications handling sensitive data, including projects aligned with HIPAA and FDA requirements.
What I can help you with:
* Web and API penetration testing
* Mobile application testing (iOS, Android)
* Network penetration testing
* Cloud and backend security assessments
* IoT and embedded device penetration testing
* Embedded systems security audits
My approach:
* Manual testing, not just automated scans
* Focus on real attack paths and impact
* Clear communication throughout the process
What you get:
* Professional report with severity (CVSS), evidence, and reproduction steps
* Practical remediation guidance your developers can use
* Executive summary for non-technical stakeholders
Technologies and platforms I have experience with (including, but not limited to):
* Frontend: React, Next.js, TypeScript, Tailwind CSS
* Backend: Node.js, Express, FastAPI, Laravel (PHP)
* Databases: PostgreSQL, Supabase, Firebase, MongoDB
* Cloud & BaaS: AWS, Supabase, Firebase, Vercel, Cloudflare
* APIs: REST, GraphQL, PostgREST
* Auth & Security: JWT, OAuth, RBAC, Row Level Security (RLS)
* Payments: Stripe (Checkout, webhooks, subscriptions)
* Mobile: Android, iOS (dynamic analysis with Frida, Objection)
* Embedded & IoT: Microcontrollers, device logic analysis, firmware interaction
* DevOps & Infra: Docker, CI/CD pipelines, GitHub Actions
* AI integrations: RAG-based systems, prompt injection testing, data leakage analysis
I’m easy to work with, responsive, and focused on delivering results that actually improve your security.
Penetration Testing
Vulnerability Assessment
Web Testing
Functional Testing
Mobile App Testing
Software QA
QA Engineering
Software Testing
Automated Testing
Test Case Design
Application Security
Usability Testing
Manual Testing
Information Security Consultation
Andrii B.
Odessa, Ukraine
$50/hr
4.9
20 jobs
● Performed Security Vulnerability Assessments of Web-Applications within the
scope.
● Handled detailed write-ups for security vulnerabilities that exposed PII data.
● Performed ethical hacks to assess the vulnerabilities of test, Internet, and/or
Intranet connected systems, networks, and applications including Windows and
Linux.
● Conducted complex analytical functions by performing security assessments and
ethical hacks of high-risk sensitive applications that expose PII data, documented
and reported security findings.
● Performed penetration tests against external networks, internal networks, web
applications, mobile applications, social engineering, phishing, physical security,
wireless networks to identify exploits and vulnerabilities.
● Had daily communication with team of cybersecurity activities with different
projects.
● Creation of DevSecOps automation process.
● Cloud incident response and forensics methodology creation.
● Performed red team activities including social engineering and privilege
escalation.
● Participated and managed which lead to successful passing certification ISO
27001, SOC2, GDPR.
● Conducted deep OSINT activities.
● Performed application penetration tests of client applications; performed
reconnaissance, enumerated internet-facing client applications, identified
vulnerabilities/misconfigurations, created reports based on findings, and
delivered reports to clients.
● Performed social engineering tests; performed reconnaissance, designed
campaign pretext, created phishing emails, created spoofed logon forms, created
reports based on findings, and delivered reports to clients.
● Performed vulnerability assessments/remediation consulting; performed
vulnerability scans, generated reports for scans, and advised on how to remediate
vulnerability findings.
● Logged all activities into the incident management system.
● Ensured incidents were closed in a timely fashion with verification of customer
satisfaction.
● Performed security evaluations, managed and regulated all user access to the
company's network, and proactively participated in team meetings with IT
managers.
● Conducted penetration tests of web, mobile, infrastructure.
● Understood common security standards and regulatory compliance
requirements.
● Gave presentations for clients about the results of penetration tests.
● Executed test cases and verified bug fixes under minimum supervision.
● Experienced with analyzing the development of technical documentation,
including test plans, executive briefs, and test reports.
Responded immediately to security-related incidents and provided thorough
remedial solutions and analysis.
Penetration Testing
Cybersecurity Tool
Cybersecurity Management
Cybersecurity Monitoring
Vitalii R.
Kyiv, Ukraine
$25/hr
5.0
2 jobs
Hi! I'm a Cybersecurity Engineer with hands-on experience in vulnerability assessments, cloud security reviews, and compliance evidence gathering. My main responcibility is to make clients understand and improve their security posture.
I work across the full assessment lifecycle: scanning exposed services, reviewing configurations, validating findings, and delivering clear, actionable remediation reports that your clients can actually use.
I'm comfortable operating under NDA and have supported multiple audit during my experience in fintech sector, so I understand the discipline and documentation standards that consulting engagements demand.
What I can do:
- Conduct vulnerability assessments using Burpsuite Scanner, OpenVAS, Nmap, Acunetix from scoping through validated findings
- Review exposed services, firewall configurations, and network infrastructure for security gaps
- Perform Microsoft 365 security reviews
- Azure security posture analysis aligned with CIS benchmarks and Microsoft Secure Score
- Gather and structure technical evidence for compliance projects (PCI DSS, ISO 27001)
- Produce detailed, structured remediation reports tailored to any environments
Relevant experience:
- Conducted web penetration tests using OpenVAS, Burp Suite, OWASP ZAP, and Metasploit
- Provided technical evidence and documentation support for internal audits and certifications
- Performed risk assessments and security hardening for infrastructure and information systems
- Wrote security policies, remediation playbooks, and technical process documentation
Understanding of frameworks & certificates:
PCI DSS
ISO 27001
CIS Benchmarks
Tech stack:
OS : Linux (Red Hat, Ubuntu), Windows (desktop & server), macOS
VM : VMware, VBox
SIEM : ELK/Wazuh, ArcSight, Splunk
Cloud : Azure, Entra ID, Defender
Network : Fortinet IPS&Firewall, Check Point Firewall, F5 WAF
Anti-DDoS : Radware, Arbor
EDR : Elastic Agent, Trellix
PAM : CyberArk
NDR : Vectra
Vulnerability Detection : Nmap, Metasploit, Burp Suite + Scanner, OWASP ZAP, OpenVAS, Harvester, Sublister, Maltego
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