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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.

Hi, I’m Zakaria Hertouch, a Cloud Automation & DevOps Engineer with over 6 years of experience streamlining software deployment and cloud operations. I help teams migrate applications to the cloud, implement CI/CD pipelines, and design highly available, fault-tolerant architectures. Skills & Tools: Cloud: AWS, Azure, GCP Automation & CI/CD: Ansible, Jenkins, GitLab CI/CD, GitHub Actions IaC: Terraform Containers: Docker, Kubernetes Monitoring: Prometheus, Grafana, ELK, Splunk Selected Achievements: Migrated multiple on-prem applications to the cloud, improving performance and reducing costs. Built CI/CD pipelines that accelerated release cycles and minimized errors. Review and analyze existing cloud architectures to optimize infrastructure performance, security and reduce costs Let’s collaborate to streamline your cloud operations and DevOps processes!

— Seasoned SOC (Security Operations Center) Level 1 Analyst adept in malware analysis, reverse engineering, and pentesting. — RedTeamer Operator & Pentester — Certified Red Team Professional (CRTP) by Altered Security. — Certified Junior Pentester (EJPT) by INE, demonstrating proficiency in ethical hacking methodologies. — Ranked ProHacker on HackTheBox. — Extensive background in Linux system administration, ensuring robust security measures and system integrity.

🔒 Experienced Cybersecurity Specialist and Proficient Developer Hello! I am an experienced and certified Penetration Tester with a Master's Degree in Cybersecurity and a Bachelor's Degree in Computer Engineering. Additionally, I bring 2 years of experience as a proficient Flutter developer and e-commerce website creation in Shopify and WooCommerce. 🎯 Cybersecurity Expertise: ✅ Vulnerability Assessment: Thorough detection and evaluation of security vulnerabilities in networks and applications. ✅ Security Gap Analysis: Proactive identification of current and potential security threats. ✅ Penetration Testing: Comprehensive security evaluations to expose vulnerabilities. ✅ Firewall Management: Configuration and management of firewall technologies. ✅ Malware Analysis: Expert detection and mitigation of malware threats. ✅ IDS/IPS: Deployment and management of intrusion detection and prevention systems. ✅ Encryption: Mastery over encryption protocols and algorithms. ✅ Security Platforms: Proficiency with BitDefender Gravity Zone and Splunk security solutions. ✅ Cloud Security: Expert management of AWS and Azure security measures. ✅ Security Standards: Deep understanding of PCI-DSS, ISO 27001, NIST, and OWASP. 📱 Mobile Application Development: ✅ Flutter & Dart: Skilled in building cross-platform apps with a focus on performance and aesthetics. ✅ Material Design: Expertise in creating visually appealing and intuitive user interfaces. ✅ Firebase Integration: Comprehensive backend solutions using Firebase. ✅ Complex Algorithms: Ability to implement complex functionalities with optimized algorithms. ✅ State Management: Proficient in managing app states using BLoC, Provider, and other Flutter packages. ✅ Platform Specifics: Development for both Android and iOS, ensuring top performance and system integration. 🌐 E-Commerce Solutions: ✅ Shopify, WooCommerce & WordPress: Expertise in creating and customizing e-commerce stores and websites, ensuring seamless user experiences. ✅ AI Solutions: Training and deploying AI models to enhance business processes. ✅ Web Development: Crafting responsive, user-friendly websites tailored to client needs. 🔗 My Commitment: My goal is to deliver projects that exceed client expectations, ensuring an outstanding user experience while maintaining schedule and budget integrity. If you're seeking a reliable professional to secure your systems, develop cutting-edge mobile applications, create e-commerce platforms, or harness the power of AI and web development, please don't hesitate to contact me. I am eager to discuss how we can collaborate to achieve your technical and security goals.

✅ JAVA ✅ Spring ✅ Thymeleaf ✅ Rest API I am a solutions provider, share with me your requirements and I will give you a complete solution, front-end to back-end. I'll take care of the whole building process. You just sit, drink a beer and enjoy your app I have experience working as a developer, team leader, and project manager. As a developer I make modular, clean, object-oriented and well-commented code, always aiming quality and intelligence in the solutions. My solutions are complete, front-end to back-end. I have experience with: java, swing, J2EE mobile development (android - java native) spring boot, spring MVC, spring roo,spring-security, spring data, thymeleaf ... HTML, CSS,javascript,angular SQL databases like MySQL, PGSQL, SQL server and ORACLE NoSQL databases like MongoDB, Cassandra JPA, hibernate elasticsearch, kibana, Redis maven, Gradle, GIT, Jira, Jenkins, docker, kubernetes 🌟 WHY CHOOSE ME OVER OTHER FREELANCERS? 🌟 ✅ Client Reviews: I focus on providing VALUE to all of my Clients and Earning their TRUST. The Client Reviews and Feedback on my Profile are immensely important to me and the value that I provide. ✅ Over-Delivering: This is core to my work as a Freelancer. My focus is on GIVING more than what I expect to RECEIVE. I take pride in leaving all of my Clients saying "WOW" ✅ Responsiveness: Being extremely responsive and keeping all lines of communication readily open with my Clients. ✅ Resilience: Reach out to any of my Current of Former Clients and ask them about my Resilience. Any issue that my Clients face, I attack them and find a SOLUTION. ✅ Kindness: One of the biggest aspects of my life that I implement in every facet of my life. Treating everyone with respect, understanding all situations, and genuinely wanting to IMPROVE my Client's situations. I am eager to work with you, to provide reliable, consistent, and High-Level solutions to design/development challenges. Please contact me, so we can discuss how we can work together to FULLY meet your Business Needs!

Senior Software Engineer & Architect | 12+ Years | Top 1% Upwork | Expert Vetted 12+ years building backend systems and full-stack products for startups and enterprises. Top 1% Upwork freelancer, Expert Vetted. I solve complex technical challenges: $18M/year saved for Time Doctor, 8M+ users scaled at Zenius, 40+ provider integrations for Wego. I focus on scalable architecture, modern stack, and on-time delivery. What I bring to your project • Modern backend: Node.js/TypeScript, Nest.js, Go/Gin, Java/Spring Boot — microservice architecture, event-driven design, serverless (AWS Lambda, GCP), gRPC, message queues (NATS, Kafka, Redis Pub/Sub), parallel/concurrent processing. • Scalable data: PostgreSQL, MongoDB, Elasticsearch, Redis; ETL, time-series, analytics; database tuning, sharding, caching, parallel queries. • Cloud & DevOps: AWS, GCP, Digital Ocean; Docker, Kubernetes, Terraform; CI/CD; monitoring (Datadog, Sentry). • AI & automation: LLM integrations (OpenRouter), AI-assisted tooling (Cursor, CodeRabbit), custom AI agents and RAGs, workflow automation (n8n), ML/TensorFlow, voice-driven systems (Google AI Services). • Frontend: React, Angular, Vue; TypeScript, Redux, real-time (WebSockets, SocketIO, SSE); responsive and PWA-ready UIs. • Payments & integrations: Payment gateways (Stripe, Paddle, MangoPay, Upvest), third-party APIs, webhooks, and secure auth (OAuth2, JWT). • Multi-tenant & complex B2B systems: Tenant isolation, row-level security, RBAC, and strict data segregation per tenant; designed and delivered multi-tenant platforms (e.g. ticketing, fleet/ops, SaaS) with role-based access, real-time sync, and per-tenant visibility, so different orgs or depots get the right data and permissions. • Enterprise & compliance: GDPR, HIPAA, SOC 2, ISO 27001; enterprise security, encryption, audit trails, multi-region deployments. • Leadership & project management: Leading teams, converting business to technical requirements, architecture decisions, code reviews, agile methodologies, technical documentation. Proven outcomes • Time Doctor (USA): Legacy payment migration to Paddle; Nest.js microservices, GCP, Pub/Sub; $18M/year saved, 9-month delivery, 24/7 monitoring. • Zenius (Indonesia): LMS and infra for 8M+ users; Kafka, GraphQL, Neo4j, sharding and caching; new revenue stream (Zencore). • Wego (Dubai/Malaysia): Hotel metasearch; 40+ providers, ETL, WebSockets, gRPC, NATS; real-time pricing and search. • Exporo (Germany): Fiat + crypto payment; FSM (XState), RxJS, AWS serverless. • BRTC (Bangladesh): Multi-tenant ticketing; Nest.js, React admin, Android POS, real-time sync. • Accordium (Malaysia/Denmark): First SaaS version; React, Java/Spring Boot, CQRS; helped secure Series B funding. • Movingwalls (Malaysia): First DOOH booking platform; IoT data pipeline, real-time analytics, D3.js. • BigWIFI (Canada): Customer engagement platform; Nest.js, real-time diagnostics, live IT support marketplace. • Suprema/Biostar 2 (South Korea): Performance optimization; 1TB+ time-series data migration, Node.js refactoring, Karate test automation. • CapitakDK (Malaysia): Voice-driven AI system for Oil & Gas; Google AI Services, ML, GraphQL. I focus on clean architecture, event-driven and microservice patterns, and production-grade observability. I’ve led and mentored engineers, written technical docs, and delivered for clients in the USA, Europe, and Asia. Delivering on time and leaving a maintainable codebase is how I work. Why clients choose me • Results-driven: I focus on outcomes, not just code. Every project delivers measurable business impact. • On-time delivery: I've never missed a deadline. I communicate clearly, set expectations, and deliver what I promise. • Clean code: I write maintainable, well-documented code following best practices. Your team can take over seamlessly. • Scalable architecture: I design systems that grow with your business. Microservices, event-driven patterns, proper database design. • Full ownership: I handle backend, integrations, infrastructure, and documentation. I mentor teams and write technical docs. • Global experience: Worked with clients across USA, Europe, and Asia. Comfortable with remote collaboration and different time zones. Tech snapshot Languages: TypeScript/JavaScript, Go, Java, Python, PHP | Backend: Nest.js, Express, Spring Boot, Gin | GraphQL, REST, gRPC Data: PostgreSQL, MongoDB, Elasticsearch, Redis, Neo4j, DynamoDB | Cloud: AWS, GCP, Digital Ocean DevOps: Docker, Kubernetes, Terraform, CI/CD, Datadog | Real-time: WebSockets, SocketIO, SSE, MQTT AI/ML: OpenRouter, Cursor, CodeRabbit, custom AI agents, RAGs, n8n, TensorFlow | Architecture: DrawIO, Lucidchart, PlantUML, Mermaid, C4 Model Project Management: Jira, Trello, Asana, Linear, Notion | Other: Kong, OAuth2, JWT, IoT, blockchain, React Native Let’s build something that scales and ships.