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✅ Professional Penetration Tester ✅ 3500+ Hours ✅ Top Rated Plus Freelancer Security Researcher and Penetration Tester recognized by the U.S. Department of Defense, AT&T, Sony, and Semrush for the responsible disclosure of 40+ vulnerabilities via HackerOne. Since 2022, an active member of the Synack Red Team - an elite tier of offensive security specialists vetted through rigorous technical and background screening. Every engagement concludes with a comprehensive technical report built to satisfy the specific penetration testing controls required for HIPAA, ISO 27001, SOC2, and PCI-DSS. I provide a high-level executive summary for stakeholders alongside deep-dive technical findings, fully reproducible Proofs-of-Concept (PoCs), and prioritized remediation steps to ensure your team can effectively close every gap before your audit. Specializing in black and gray box testing of live web applications, cloud environments, and networks, covering all common attack vectors, business logic flaws, and discovering previously undisclosed vulnerabilities (0days) to prevent high-impact data breaches. Service Description: 1) Web Application Penetration Testing (OWASP Top 10, PTES, ASVS, Business Logic Testing) 2) Mobile Application Penetration Testing (OWASP Top 10, MASVS, MASTG, PTES) 3) Network Penetration Testing (Active Directory, Entra ID, Internal & External Network) 4) API Security Testing - REST, GraphQL, SOAP, gRPC, Webhooks (OWASP API Top 10) 5) Cloud Security Testing - AWS/Azure/GCP/OCI/Alibaba/IBM/DigitalOcean/SaaS/IaaS/PaaS 6) Cloud-Native & Container Security (Kubernetes, Docker, OpenShift, EKS/AKS/GKE) 7) LLM Security Testing (OWASP LLM Top 10, Prompt Injection, Data Poisoning) Tools used in engagements: BurpSuite Professional | Custom Python scripts | BloodHound | Impacket Framework | Responder | Metasploit | Mimikatz | Nuclei | Nmap | FRIDA | Android Studio | Pacu | Prowler | Postman Identify and secure your attack surface before threat actors do ! Message me to discuss your project requirements.

Native Android apps crafted with care. With over 5 years of experience in Android development, I take pride in delivering clean, efficient, and well-tested apps. Whether you need a brand-new app built from scratch or improvements to an existing one, I aim to make the process as smooth as possible. I pay close attention to testing across multiple Android versions, screen sizes, and use cases — so that QA feels effortless. My skills include: • Android Studio • Kotlin & Java • MVVM architecture • Firebase • Retrofit • XML & Jetpack Compose • Dagger / Hilt • RxJava & Kotlin Coroutines • REST APIs • Room Database • CI/CD pipelines • Clean Architecture If you’re looking for a reliable Android developer who focuses on quality and detail — feel free to reach out!

Education: 2011 - 2016 University of Niš, Faculty of Science and Mathematics, Bachelor of computer science Experience: 2020 – present Freelancer at Upwork 2018 - 2019 Teacher at high school Bora Stanković, Niš 2016 - 2018 Astrograde lab Unity3D game developer Skills: Ability in Java, C#, C++ with good understanding of object oriented development Experience with HTML5, CSS3, JavaScript, jQuery Experience with database management system MYSQL Basic knowledge of Oracle, and MongoDB database management system Experience with Unity3D Basic knowledge of Android studio Basic knowledge of .Net framework Keen active listening and problem-solving Passion and enthusiasm for games development Motivated self-starter with the ability to learn and adapt to new technologies Languages: Serbian (native) English (intermediate)

👋 Hi, I'm a dedicated Software Developer specialized in building modern and interactive web and mobile applications for over 4 years in the industry. As a Top Rated freelancer on Upwork, I've completed and led multiple projects in the past. For more references check my account reviews and feedback to feel the level of quality I produce. Using technologies like React, React-Native, Next.js, and Node, I strive to deliver efficient and effective solutions leveraging industry best practices, creating seamless user experiences that are both visually appealing and highly functional. If You're Looking For: ✅ Full-Stack Mobile and Web App Development ✅ Cross-Platform Development ✅ SEO Friendly Websites using SSR and SSG technologies ✅ WordPress Website ✅ UI/UX Design ✅ Frontend Development ✅ Backend Development ✅ Database Integration ✅ Third-Party API Integration ✅ Deployment and Maintenance Or Have Questions? Feel Free to Reach Out! 📩 🔥 Skills🔥 ✅ Javascript / TypeScript / Node.js / Deno.js / HTML / CSS ✅ React / Next.js / Astro / Nest.js /Express.js ✅ React Native / Expo / Xcode / Android Studio ✅ Redux / Redux Toolkit / React Query / Zustand / Mobx ✅ Tailwind / MaterialUI / ChakraUI / CSS-in-js / SASS / Storybook ✅ Firebase / AWS / Strapi / MongoDB/ SQL ✅ RestAPIs / GraphQL / Prisma / tRPC / SSR / SSG ✅ Jest / Cypress / Detox ✅ CI/CD / Git / Monorepo Looking forward! Stefan.

🚀 As a seasoned Android Developer with over five years of dedicated experience, I specialize in transforming innovative ideas into high-performance, user-friendly mobile applications. My expertise lies in crafting scalable solutions with clean, maintainable code, ensuring your project not only meets but exceeds expectations. Technical Proficiencies: ⚬ Kotlin, Java, Python, C# ⚬ Jetpack Compose, Android SDK, Firebase, GraphQL, Material UI ⚬ Modern architectural patterns (MVVM, Clean Architecture), CI/CD, Gradle, GitHub ⚬ REST APIs, third-party services, real-time data handling 💬 Clear communication is essential in my workflow. I will provide regular updates and engage proactively throughout the project, creating a collaborative atmosphere where ideas thrive and solutions are tailored to your needs. 🤝 Let's collaborate to bring your vision to life with cutting-edge Android applications that stand out in today's competitive market!

I'm Ivan, an Android Developer with over 6 years of experience. I am proficient with writing code in Java and Kotlin and have an excellent understanding of OOP and SOLID principles. SQL database, MVVM and Clean architecture, GIT (GitHub, Bitbucket), Jetpack Compose, Dependency Injection, Develop applications that use RESTful APIs to connect to back-end services, Develop layouts for different screen sizes, Jira & Zeplin tools, Gradle, and Code refactoring. Publishing apps on Google Play store, Galaxy Store & App Store. Monetizing apps with AdMob ads and In-App purchases. Working with 3rd party libraries (Dagger + Hilt, Retrofit, Room, Volley, iText, Ffmpeg, OneSignal, Firebase, Picasso, Glide, Google Maps, GSON, Crashlytics, Firebase Cloud Messaging, Admob, CameraX, Coil, etc.). Basics usage of HTML5, CSS3, and JavaScript coding practices. Advanced problem-solving skills. ADDITIONAL SKILLS - Basic knowledge of iOS app development (Xcode – Swift 5 language) - Build and publish iOS applications in the App Store. Monetizing with AdMob ads - 3rd party libraries (Firebase Authentication and Realtime Database, PDFKit, Admob, etc.) - Beginner in a flutter - Adobe Photoshop & Adobe Illustrator LANGUAGE - English - Serbian