You will get Smart Contract Security Audit (Solidity / EVM) for Blockchain Projects
Rising Talent
Rising Talent
Project details
❗𝐁𝐄𝐅𝐎𝐑𝐄 𝐁𝐔𝐘𝐈𝐍𝐆 𝐓𝐇𝐈𝐒 𝐏𝐑𝐎𝐉𝐄𝐂𝐓, please send demands to me through Upwork Direct by visiting my Upwork profile so I can return with a positive reply! 📞
I will perform a professional security audit of your Solidity smart contracts to identify vulnerabilities before attackers exploit them. My process combines manual code review + automated tools, ensuring no hidden risks remain.
You’ll receive:
• Detailed findings with clear Proof of Concepts (PoCs)
• Risk classification (Critical/High/Medium/Low)
• Secure coding & remediation guidance
• Free re-audit after fixes
I have helped multiple DeFi, NFT, and blockchain projects prevent multimillion-dollar exploits by securing their contracts before going live.
penetration testing, web application security, vulnerability assessment, ethical hacking, API penetration testing, smart contract audit, blockchain security, cloud security audit, AWS security, mobile app penetration testing
I will perform a professional security audit of your Solidity smart contracts to identify vulnerabilities before attackers exploit them. My process combines manual code review + automated tools, ensuring no hidden risks remain.
You’ll receive:
• Detailed findings with clear Proof of Concepts (PoCs)
• Risk classification (Critical/High/Medium/Low)
• Secure coding & remediation guidance
• Free re-audit after fixes
I have helped multiple DeFi, NFT, and blockchain projects prevent multimillion-dollar exploits by securing their contracts before going live.
penetration testing, web application security, vulnerability assessment, ethical hacking, API penetration testing, smart contract audit, blockchain security, cloud security audit, AWS security, mobile app penetration testing
Programming Language
JavaScript, Solidity, TypeScriptBlockchain Platform
Hyperledger FabricWhat's included $99
These options are included with the project scope.
$99
- Delivery Time 3 days
- Number of Revisions 3
- Source Code
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GB
Graziela B.
Jun 2, 2026
Cybersecurity for V.
We loved working together; the service was very well delivered, and we look forward to the next project.
IK
Ian K.
Apr 4, 2026
Cloud Security Engineer (AWS | Terraform | Incident Response)
Oleksandr is a strong Cloud Security Engineer with solid experience in AWS security, Terraform, and incident response.
He helped improve our AWS environment using GuardDuty, Security Hub, and WAF, and worked on secure Terraform configurations, CI/CD security (GitHub Actions), and vulnerability management. He also supported compliance efforts (ISO 27001, GDPR, NIS2).
Over time, he became more independent, handled multiple tasks, and delivered consistent results.
I can recommend Oleksandr for any AWS / Cloud Security / DevSecOps role.
He helped improve our AWS environment using GuardDuty, Security Hub, and WAF, and worked on secure Terraform configurations, CI/CD security (GitHub Actions), and vulnerability management. He also supported compliance efforts (ISO 27001, GDPR, NIS2).
Over time, he became more independent, handled multiple tasks, and delivered consistent results.
I can recommend Oleksandr for any AWS / Cloud Security / DevSecOps role.
BT
Byron T.
Mar 2, 2026
Server Security Expert
Thank you for your great support! Job well done.
OC
Oleksii C.
Jan 12, 2026
Penetration Tester Needed
Oleksandr did an excellent job delivering a thorough and practical penetration test across our web application, APIs, cloud infrastructure, and smart contracts. The findings were well-prioritized, clearly explained, and came with actionable remediation advice. Communication was smooth and professional, and the final report was concise and high quality. Highly recommend Oleksandr as a skilled and reliable penetration tester.
VV
Vlad V.
Dec 1, 2025
Additional Task for Existing Project: Looking for a Cybersecurity Expert for Penetration Testing
I’ve worked with Oleksandr before, and once again he delivered everything quickly, professionally, and with great attention to detail. Strong expertise across web security, cloud environments, and smart contracts, plus clear and actionable recommendations. A reliable specialist and always a smooth collaboration. Highly recommended!
About Oleksandr
Cybersecurity Expert Penetration Tester Cloud Security Ethical Hacker
100%
Job Success
Chernivtsi, Ukraine - 12:09 am local time
𝐈’𝐦 𝐧𝐞𝐰 𝐭𝐨 𝐔𝐩𝐰𝐨𝐫𝐤 ⭐️𝐛𝐮𝐭 𝐚𝐬 𝐚 𝐂𝐲𝐛𝐞𝐫𝐬𝐞𝐜𝐮𝐫𝐢𝐭𝐲 𝐄𝐱𝐩𝐞𝐫𝐭⭐️𝐏𝐞𝐧𝐞𝐭𝐫𝐚𝐭𝐢𝐨𝐧 𝐓𝐞𝐬𝐭𝐞𝐫 𝐰𝐢𝐭𝐡 𝟏2+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐩𝐫𝐚𝐜𝐭𝐢𝐜𝐚𝐥 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞⭐️
💡 Why Me
🌍 ✔ 660+ 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
Steps for completing your project
After purchasing the project, send requirements so Oleksandr can start the project.
Delivery time starts when Oleksandr receives requirements from you.
Oleksandr works on your project following the steps below.
Revisions may occur after the delivery date.
Scope & Access
Get contracts, documentation, and project goals.
Audit & Testing
Perform manual + automated code review, vulnerability testing, and exploit attempts.