Hire the Best Penetration Testers

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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
  • Software Testing
  • Software QA
  • Web Testing
  • Functional Testing
  • Mobile App Testing
  • QA Engineering
  • Automated Testing
  • Test Case Design
  • Vulnerability Assessment
  • Application Security
  • Usability Testing
  • Manual Testing
  • Information Security Consultation
Steffin S.

Kozhikode, India

$30/hr
4.8
205 jobs

OSCP & CREST-certified Penetration Tester helping SaaS companies, startups, e-commerce platforms, and enterprise teams find real, exploitable security weaknesses before attackers do. I provide manual-first penetration testing for Web Applications, APIs, Mobile Apps, Networks, Active Directory environments, Infrastructure, and Thick Client/Desktop Applications. My focus is not just finding vulnerabilities, but validating real-world exploitability, explaining business impact, and giving your developers clear remediation guidance they can actually apply. 🔎 Core services I provide: • Web Application Penetration Testing • API Security Testing • Mobile Application Penetration Testing for Android and iOS • External Network Penetration Testing • Internal Network & Active Directory Security Assessment • Thick Client / Windows Desktop Application Testing • OWASP Top 10 & OWASP WSTG-Based Security Testing • Vulnerability Assessment & Manual Validation • OSINT & External Attack Surface Assessment • Security Retesting & Remediation Validation • SOC 2, ISO 27001, PCI DSS, Amazon SP-API, and compliance-oriented pentest reports 📄 What you receive: • A professional penetration testing report • Clear proof-of-concept evidence and screenshots • Technical explanation of each vulnerability • Business impact written in simple, practical language • Severity rating and CVSS scoring where applicable • Step-by-step remediation guidance for developers • Retest results after your team applies fixes • Executive summary suitable for management, compliance, vendor review, and internal audit ⚡ My testing approach: I perform Black Box and Grey Box penetration testing depending on your project requirements. I use a manual-first methodology supported by professional tools such as Burp Suite Pro, but I do not rely only on automated scanners. The goal is to identify security issues that matter in real attack scenarios, including authentication flaws, authorization bypasses, SQL Injection, IDOR, access control issues, business logic vulnerabilities, API security weaknesses, injection flaws, misconfigurations, and sensitive data exposure. 🎯 Best fit if you need: • A security test before launching a product or major feature • A web application, API, mobile app, network, or infrastructure assessment • A compliance-ready report for SOC 2, ISO 27001, PCI DSS, vendor review, or investor due diligence • Manual security testing focused on real exploitability • Clear communication with practical remediation advice • Reliable retesting after fixes are completed 🏆 Certifications and experience: • OSCP • OSEP • OSWP • CREST CPSA • Top Rated in Information Security / IT Compliance • Ranked in the Top 50 in multiple bug bounty programs • Completed 500+ penetration tests and security assessments • Available across different time zones • Open to one-time assessments and long-term security engagements ✅ Need a professional penetration test or vulnerability assessment for your web application, API, mobile app, network, or infrastructure? 📩 Send me a message, and I will help you define the right scope, testing approach, timeline, and deliverables for your security goals.

  • Penetration Testing
  • Information Security
  • Network Security
  • Security Assessment & Testing
  • Security Testing
  • Vulnerability Assessment
  • System Security
  • Application Security
  • Web App Penetration Testing
  • Website Security
  • Web Application Security
  • Black Box Testing
  • Network Penetration Testing
  • OWASP
  • Risk Assessment
Oleksandr F.

Chernivtsi, Ukraine

$35/hr
5.0
18 jobs

⭐️⭐⭐️⭐️⭐️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
  • Database Security
  • Security Testing
  • Source Code Scanning
  • System Security
  • Web Application Firewall
  • Web App Penetration Testing
  • Network Penetration Testing
  • Network Security
  • Cybersecurity Management
  • Cybersecurity Monitoring
  • Information Security
  • ISO 27001
  • Cloud Security
  • Website Security
  • Application Security
  • Vulnerability Assessment
  • Ethical Hacking
  • Mobile App Testing
  • API Testing
Michael H.

Baltimore, Maryland

$125/hr
5.0
115 jobs

Stop relying on automated scans. I find the vulnerabilities they miss. I’m a senior penetration tester and vulnerability researcher with deep experience across enterprise networks, web apps / APIs and cloud platforms. Most testers just run automated tools and hand you a generic report. I simulate how an attacker actually thinks, perform thorough testing, and deliver professional, tailored reporting suitable not just for your own remediation efforts but also for audit / compliance. Benefits of manual testing: - Chaining multiple low/medium findings to show more significant impact - Breaking multi-tenant isolation - Bypassing auth controls (JWT, OAuth, misconfigurations) - Identifying cost-amplification / abuse vectors (e.g., billing attacks in serverless environments) - ZERO false positives (and wasted time trying to remediate non-issues) - REAL severity scoring (not just CVSS or ratings with no connection to actual impact/risk for your systems and data) What I Deliver - Manual, attacker-style testing (not just scans) - Clear, prioritized findings with real business impact - Proof-of-concept exploits where it matters - Practical remediation guidance your devs can use immediately - Optional retesting to verify fixes Common Engagements - SaaS / multi-tenant application security testing - API and authentication testing (JWT, OAuth, session flaws) - Cloud security reviews (GCP, AWS, Azure, O365) - DevOps security reviews (Gitlab/hub, BitBucket, etc.) - Pre-SOC2 / investor readiness assessments - High-intensity black-box pentests Why Clients Hire Me - I go beyond the scan—I find what others miss - I understand both offense and architecture - I communicate clearly with both engineers and leadership - I’ve worked on MANY real-world, high-impact systems I also help organizations: - Investigate breaches - Contain active threats - Recover compromised systems (Note: I do not assist with social media account recovery.)

  • Penetration Testing
  • Security Analysis
  • Security Engineering
  • Web Application Security
  • Ethical Hacking
  • Certified Information Systems Security Professional
  • Security Assessment & Testing
  • OWASP
  • White Box Testing
  • Network Security
  • Security Infrastructure
  • Vulnerability Assessment
  • Web App Penetration Testing
  • Network Penetration Testing
  • Incident Management
Youssef E.

Kenitra, Morocco

$25/hr
5.0
28 jobs

I find the vulnerabilities in your web apps, APIs, and networks before attackers do, then hand your team a clear, reproducible penetration testing report they can act on. GXPN and GCIH certified. Top Rated on Upwork with 100% Job Success across web application, API, and network security engagements. No scanner dump and no jargon wall. Every finding comes with a severity rating (CVSS), working proof of concept, and a concrete fix your developers can ship. What I test: - Web application penetration testing (OWASP Top 10, PTES, NIST) - API security testing (REST, GraphQL, auth/OAuth, IDOR, broken access control) - SaaS and multi-tenant assessments (Supabase / Firebase data-isolation testing) - Network and external perimeter penetration testing - Source code / secure code review How I work: authorized testing only, on systems you own or have permission to test. Everything is documented over Upwork so you get a written record of every finding, not a verbal hand-wave. I retest after you patch to confirm the holes are actually closed. Credentials: GXPN (GIAC Advanced Penetration Tester & Exploit Researcher), GCIH (GIAC Certified Incident Handler), SANS CTF winner, and an active national/international CTF competitor (web, reverse, crypto, forensics). I also handle WordPress malware removal and incident response. See my Project Catalog for a fixed-price option.

  • Penetration Testing
  • Web Application Security
  • WordPress
  • Malware Removal
  • Website Security
  • Vulnerability Assessment
  • Network Penetration Testing
  • OWASP
  • Information Security
  • API
Md Shohel R.

Khulna, Bangladesh

$80/hr
4.6
57 jobs

✅ Top Rated Plus Expert ✅ 8,300+ Hours ✅ Certified Professional Penetration Tester Certifications : 🏅 OSCP (Offensive Security Certified Professional) 🏅 ISO 27001:2022 Lead Auditor 🏅 eCPPT (Certified Professional Penetration Tester) 🏅 eWPTX (Web Application Penetration Tester Extreme) 🏅 CEH (Certified Ethical Hacker) To whom it may concern, With over 6900+ hours of hands-on experience and more than 300+ successful Penetration Tests and Security Assessments, I bring a wealth of expertise to every project. My focus has been on Web, Network and Mobile (Android and iOS) applications, especially within the finance sector, using a variety of technologies and frameworks. My experience also extends to server security testing and hardening. I take pride in delivering detailed, professional reports that meet and exceed compliance audit requirements. These reports outline every vulnerability discovered, along with practical, actionable solutions. Sample reports can be provided upon request. Consider me an extension of your internal team dedicated to ensuring the highest standards of security for your organization. I respond promptly to your needs and work tirelessly to safeguard your systems. Core Services: ✓ Web Application Penetration Testing (OWASP TOP 10 based) ✓ Mobile (Android and iOS) Applications Penetration Testing ✓ Network Penetration Testing ✓ API Penetration Testing ✓ Cloud Security Assessment ✓ External Penetration Testing ✓ Internal Penetration Testing ✓ Security Hardening ✓ Phishing Simulations ✓ Security Risk Assessment ✓ Security Policy Assessment ✓ Security Training Methodologies and Frameworks: ✓ OWASP TOP 10 ✓ OSSTMM ✓ NIST ✓ PTES ✓ PCIDSS ✓ ISO 27001 ✓ CIS ✓ MITRE ATT&CK® Pentesting Tools: BurpSuite Professional, Nessus, Acunetix, Nmap, Metasploit, Mimikatz, MobSF, Sqlmap, John the Ripper, Kali Linux, Wireshark, Hashcat, Python Framework I’m here to help your company achieve the best in security, ensuring your applications and networks are fortified against threats.

  • Penetration Testing
  • Page Speed Optimization
  • Linux System Administration
  • WordPress Malware Removal
  • Information Security
  • Information Security Audit
  • Web Application Security
  • Web Application Firewall
  • Network Security
  • Network Penetration Testing
  • Vulnerability Assessment
  • Information Security Consultation
  • Firewall
  • Cloud Security Framework
  • Mobile App Testing

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How to Hire Top Penetration Testers

What is a penetration tester?

Penetration testing is the practice of performing a software attack on a computer system or network for the purpose of discovering weaknesses, exploits, and vulnerabilities. A penetration tester will help keep your security one step ahead of those looking for an easy way into your network.

How do you hire a penetration tester?

You can source penetration tester talent on Upwork by following these three steps:

  • Write a project description. You’ll want to determine your scope of work and the skills and requirements you are looking for in a penetration tester.
  • Post it on Upwork. Once you’ve written a project description, post it to Upwork. Simply follow the prompts to help you input the information you collected to scope out your project.
  • Shortlist and interview penetration testers. Once the proposals start coming in, create a shortlist of the professionals you want to interview. 

Of these three steps, your project description is where you will determine your scope of work and the specific type of penetration tester you need to complete your project. 

How much does it cost to hire a penetration tester?

Rates can vary due to many factors, including expertise and experience, location, and market conditions.

  • An experienced penetration tester may command higher fees but also work faster, have more-specialized areas of expertise, and deliver higher-quality work.
  • A contractor who is still in the process of building a client base may price their penetration tester services more competitively. 

Which one is right for you will depend on the specifics of your project. 

How do you write a penetration tester job post?

Your job post is your chance to describe your project scope, budget, and talent needs. Although you don’t need a full job description as you would when hiring an employee, aim to provide enough detail for a contractor to know if they’re the right fit for the project.

Job post title

Create a simple title that describes exactly what you’re looking for. The idea is to target the keywords that your ideal candidate is likely to type into a job search bar to find your project. Here are some sample penetration tester job post titles:

  • Need hackers to test our network security system
  • Penetration testers needed to help us find system vulnerabilities
  • Remote penetration testers wanted to recommend backdoor to new software

Project description

An effective penetration tester job post should include: 

  • Scope of work: From designing tests to conducting physical assessment of equipment, list all the deliverables you’ll need. 
  • Project length: Your job post should indicate whether this is a smaller or larger project. 
  • Background: If you prefer experience with certain industries, software, or environments, mention this here. 
  • Budget: Set a budget and note your preference for hourly rates vs. fixed-price contracts.

Penetration tester job responsibilities

Here are some examples of penetration tester job responsibilities:

  • Develop tests designed to break into security-protected applications and networks
  • Conduct physical assessments of entire network servers and systems 
  • Document key findings, write reports and deliver findings to executive team

Penetration testers job requirements and qualifications

Be sure to include any requirements and qualifications you’re looking for in a penetration tester. Here are some examples:

  • Masters degree in computer science or similar field required 
  • Minimum four years experience in security vulnerability testing
  • Extensive knowledge of two or more programming languages