Advanced Cybersecurity and Cryptography Specialist Profile With over 15 years of experience at the forefront of offensive security, my expertise transcends traditional cybersecurity boundaries, delving deeply into applied cryptography, cybersecurity engineering, and advanced data science. I am a Cybersecurity Specialist, Ethical Hacker, and Data Scientist, with a proven track record in delivering high-impact security solutions for critical sectors such as banking, blockchain, mobile, and military-grade environments. Applied Cryptography: Quantum Defense and Zero-Knowledge Proofs My specialization in cryptography extends beyond classical paradigms, encompassing the emerging frontiers of Quantum Cryptography and Post-Quantum Cryptography (PQC). I possess proficiency in the analysis and implementation of quantum-resistant algorithms, such as Lattice-based Cryptography (e.g., CRYSTALS-Kyber, CRYSTALS-Dilithium), Hash-based Signatures (e.g., SPHINCS+), and Code-based Cryptography (e.g., McEliece), ensuring data and communication security in a post-quantum future. My experience includes evaluating cryptographic primitives for compliance with emerging NIST PQC standards. Furthermore, I am a specialist in Zero-Knowledge Proofs (ZKP), focusing on protocols like zk-SNARKs and zk-STARKs. I develop and audit ZKP implementations to ensure privacy and scalability in decentralized applications and authentication systems, enabling information verification without revealing underlying data. My work spans from underlying theory to optimizing arithmetic circuits and mitigating vulnerabilities in ZKP implementations. My previous experience at Kryptus, where I worked on the development of Hardware Security Modules (HSMs) and conducted advanced Side-Channel Attacks (SCA) analyses, such as Differential Power Analysis (DPA) and Electromagnetic Fault Injection (EMFI), and Fault Injection on military-grade systems, solidifies my ability to protect critical assets against the most sophisticated threats. I ensure compliance with rigorous standards such as FIPS 140-2, Common Criteria, and NIST. Cybersecurity: Code Review, Pentesting, and Vulnerability Analysis I have led Red Team operations, Secure Code Reviews, and in-depth technical pentests across a wide range of attack surfaces, including web applications, RESTful APIs, mobile apps (Android/iOS), smart contracts, and cloud infrastructures. My approach integrates white-box and hybrid testing methodologies, combining SAST (Static Application Security Testing), DAST (Dynamic Application Security Testing), and IAST (Interactive Application Security Testing) with exploit chaining, cryptographic audits, and real-time adversarial modeling. I have a proven track record in securing platforms for financial institutions like Banco Bradesco, Alelo, and major online gaming companies like Blaze. My work in smart contract auditing and blockchain security includes vulnerability analysis in Solidity-based protocols, CI/CD pipelines for dApps, and node-level attack simulations (Sybil, Eclipse, Reentrancy, Front-running). I utilize tools such as MythX, Slither, Oyente, and custom fuzzers for EVM and non-EVM environments. Digital Forensics and Incident Response In the field of Digital Forensics, I possess extensive experience in post-incident forensic analysis and malware analysis using static and dynamic tools. My ability to reconstruct events, identify the root cause of breaches, and extract Indicators of Compromise (IoCs) is fundamental for effective incident response. I am proficient in investigating system compromises, data recovery, and presenting detailed forensic reports to support litigation or regulatory compliance. Data Science and Threat Intelligence As a mathematician and data scientist, I apply Monte Carlo simulations, probabilistic modeling, and AI ecosystems to detect and classify fraudulent behaviors at scale. I have developed Machine Learning pipelines to predict attack patterns, model digital threats, and map OSINT-derived fraud campaigns in real-time. Other Key Competencies: • Mobile SDK Hardening: anti-Frida, anti-hooking, secure enclave usage. • Token Abuse Detection: JWT and OAuth2. • Browser and API Fuzzing: Burp Suite, Postman, nuclei, ffuf. • OSINT, Threat Hunting, and Social Media Abuse Investigations. • Implementation of Zero Trust Architectures, WAFs, SIEM, IAM, DLP. With a relentless focus on excellence, I deliver detailed vulnerability reports, Proofs of Concept (PoCs), and actionable remediation plans, aligned with the most rigorous industry standards, including OWASP, MITRE ATT&CK, ISO 27001, and PCI-DSS.

🚀 I'm a Top-Rated Software Engineer with 12 years of experience, specializing in high-speed, high-quality product delivery through AI-augmented engineering. Rather than being a traditional "Full-Stack" developer who is strong in one area and weak in others, I bring three equally strong, deeply practiced specializations to every project: Backend Engineering, Frontend Architecture, and DevOps/System Administration. --- 💼 HOW I WORK (THE AI ADVANTAGE) I am on the cutting edge of AI-assisted software development. I don't do "vibe coding"; I practice rigorous Human-In-The-Loop (HITL) engineering. By deeply integrating modern AI tools into my daily workflow (for code generation, complex refactoring, and code review), I achieve a massive boost in delivery speed and code quality. This allows me to build complex systems faster than a traditional developer, while maintaining strict architectural control and test coverage. --- 1. STACK AGNOSTIC & THE PRR PREFERENCE I am fundamentally a stack-agnostic engineer. I can jump into and efficiently maintain JS/TS stacks (Next.js, React, SvelteKit, etc) or PHP (Laravel) without hesitation. However, my absolute favorite backend stack—and the one I find most enjoyable to work with — is what I call the "PRR" stack: - Ruby (Ruby on Rails): My go-to for rapid product development and complex business logic. - Python (FastAPI, FastHTML, etc): For robust, high-performance APIs and data-heavy tasks. - Rust: My choice for performance-critical components and system-level tools (I am actively prioritizing projects involving Rust). 🔥 Whether you are building with my favorite PRR stack, or need an expert to scale and maintain your existing JS/TS or PHP codebase, we are going to be a great fit. --- 2. FRONTEND ARCHITECTURE While I am completely capable of working with React (it doesn't scare me), I strongly prefer and advocate for simpler, more maintainable frontend architectures: - Hypermedia / HTMX / Hotwire: My preferred way to build dynamic, responsive web applications without the overhead of heavy SPA frameworks. - Elm: For when absolute reliability and zero runtime errors are required on the frontend. - Tailwind/Vanilla modern CSS: For rapid, beautiful, and maintainable styling. --- 3. DEVOPS & SYSTEM ADMINISTRATION DevOps is my parallel specialization. I don't just write code; I know exactly how to deploy, scale, and secure it. I have 12 years of daily Linux administration experience. - Infrastructure as Code: Terraform, Ansible - Containers & Orchestration: Docker, Podman, Nomad, Consul (Hashicorp stack) - Networking & Security: Cloudflare (Zero Trust, Tunnels), Traefik, Nginx, SSL/TLS - Clouds: AWS, GCP, DigitalOcean, Hetzner, Vercel, Render --- ⌛ AVAILABILITY Available 7 days a week, up to 14 hours a day. Ready to dive into your project and deliver results.

With a decade of backend engineering experience, I build high‑performance, scalable systems that power today’s fastest apps. I specialize in Python, Rust and C/C++ - crafting robust APIs, microservices and data‑driven architectures. Whether you need a new service built from the ground up or performance bottlenecks eliminated in an existing system, I bring clarity, precision and results. I’ve delivered production‑ready systems using Flask, Django and FastAPI; managed PostgreSQL/MySQL, Redis caching layers; containerized services with Docker and orchestrated them on Kubernetes; and leveraged AWS infrastructure to deploy globally. My code is clean, tested and maintainable - version‑controlled with Git and delivered via CI/CD pipelines.

With 10+ years of experience as a Senior Engineer and Technical Team Lead, I specialize in driving large-scale enterprise applications through Agile best practices. I provide a strong ownership mentality and clear communication, having successfully led 10+ enterprise projects from initial development to production handover and client delivery. My expertise covers .NET, React, Blazor, Rust, and Python using Microservices and Clean Architecture with Postgres and MongoDB. I manage Azure and AWS cloud environments daily, integrating advanced AI via LangChain and Semantic Kernel alongside complex APIs like Salesforce, QuickBooks, Xero, and Microsoft Graph. ✔️ Industry Experience Banking | Fintech | Audit | Workflow Automation | Accounting and Tax Related App | Custom Business Solution | CRM | Lead Management | Business Web App ✔️Programming Languages C# (.NET 8/9) | Rust | Python | TypeScript | JavaScript | C++ | SQL ✔️Backend Technologies & Frameworks ASP.NET Core (Web API & Microservices) | Actix | Rocket | ExpressJS | NextJS | .NET Framework | WinForms | FastAPI | Django | CLI Tools Development ✔️Frontend Technologies & Framework React | Next.js | Blazor (WASM & Server) | Angular | jQuery | Bootstrap | Tailwind CSS | Figma to Code ✔️Cloud & Managed Servers Azure | AWS | Windows Server | Linux Server | Docker | Kubernetes (K8s) | Helm | Containerization ✔️CI/CD & DevOps Automation Azure DevOps | GitHub Actions | GitHub CI | Jenkins | Terraform (IaC) | GitOps | Infrastructure as Code | Release Management ✔️Cloud Services Azure App Service | Azure Blob Storage | Azure Bot Service | Azure Notification Service | Azure OpenAI | Azure AI Search | AWS EC2 | AWS Elastic Beanstalk | AWS S3 | AWS SES | AWS Security | Azure Managed Database ✔️Database Microsoft SQL Server | PostgreSQL | Azure Cosmos DB | MongoDB | MySQL | Oracle | Vector Databases (Pinecone | Milvus | Weaviate) ✔️Authentication & Authorization OpenIDConnect | OAuth 2.0 | Microsoft Entra / Azure AD + B2C | OpenIddict + Identity Server | Keycloak | Auth0 | Okta | IAM Security ✔️Background Services & Jobs ASP.NET Core Hosted Services | Hangfire | Quartz.NET | Celery | Rust Background Job | Windows Service Background Jobs ✔️Caching Redis (Distributed Caching) | Memcached | In-Memory Caching for Single Instance ✔️AI Development & Agentic Workflows LangChain | Semantic Kernel | LangGraph | CrewAI | AutoGen | LlamaIndex | MCP Server | RAG Pipelines | Multi-agent Orchestrator | n8n | VAPI (Voice AI) | Generative AI ✔️AI-Powered Development & Productivity (Vibe Coding) Cursor | GitHub Copilot | Claude API | Antigravity | OpenAI API | Gemini API | Mistral API | AI-Assisted Architecture ✔️Development & Project Management Tools Azure DevOps | Jira | Trello | Slack | Postman | Swagger (OpenAPI) | Git | GitHub | Bitbucket | Confluence If you find my skillset good enough for you expectation then hit invite button and discuss further more.

Senior Software Developer and Industrial ML Specialist with over 20 years of experience. In my previous role I built mission critical software, including the control systems (SCADA) used to run pipelines, LRT systems, and power plants. Since then I co-founded a startup to build the ML to augment those systems, optimizing industrial systems to reduce power cost and increase throughput, and building failure prediction and detection systems to avoid costly downtime and repairs. My industrial background gives me the experience needed to take software past "production ready" to the five-nine reliability needed when a single glitch can take down a multi-billion dollar production system, or prevent life-saving infrastructure from running in an emergency. As an ML engineer I went back to those same systems with an eye towards the hidden opportunities buried in the raw data. This involved dealing with the complexities of messy real world data such as: missing or malfunctioning instruments, unknown time offsets, unlabelled data, missing logs, and clients with a very different view of the systems. I handled the full lifecycle: data validation and cleaning, feature engineering, model development, application design, and cloud deployment. As a developer I specialize in C/C++, Python, and JavaScript, and am a skilled full-stack developer with strong Linux/Unix system administration skills. My ML specializes in time series, regression, and categorization, but I have built solutions in many other areas including Computer Vision, Reinforcement Learning, and Large Language Models. Having co-founded and led a startup I have a strong eye for evaluating business proposals and focusing on what's needed for a successful MVP. For instance, I know when a particular piece of functionally is critical to the value proposition, and thus needs to be absolutely flawless. And I know which bits of functionality just need to be done as quickly and cheaply as possible so the prototype can get out the door.

If you need a reliable engineer to turn a product idea into production software, I can help. I am a Full-Stack and AI Engineer with production experience in Rust, Go, TypeScript, React, Next.js, Node.js, PostgreSQL, MongoDB, and Redis. I build backend systems, AI-powered tools, desktop apps, dashboards, and automation workflows with clean architecture and maintainable code. What I can help with: - Full-stack web apps: Next.js/React frontends, Node.js or Go APIs, dashboards, admin panels, auth, and database-backed products - AI products: chatbots, document-aware assistants, semantic search, vector databases, retrieval workflows, and file indexing pipelines - Backend systems: API design, background jobs, Redis caching, clean architecture, scalable services, and production-ready integrations - Rust and Go systems: desktop apps, cross-platform tooling, OTA update workflows, Bluetooth integrations, and high-performance services You can expect clear communication, practical technical decisions, and code that is built for real users. Send me a message with your project details and I will help map the fastest reliable path to launch.

Leveraging a deep understanding of full-stack development and advanced machine learning, I provide a suite of specialized services: • 𝐀𝐥𝐠𝐨𝐫𝐢𝐭𝐡𝐦𝐢𝐜 𝐓𝐫𝐚𝐝𝐢𝐧𝐠 & 𝐌𝐋 𝐁𝐨𝐭𝐬: Develop custom, fully automated trading bots for various asset classes (e.g., crypto, forex, stocks), including strategy implementation, backtesting, and live execution. • 𝐅𝐮𝐥𝐥𝐒𝐭𝐚𝐜𝐤 𝐀𝐈 𝐒𝐲𝐬𝐭𝐞𝐦 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞: Design and build the complete infrastructure for automated financial systems, from reliable backend APIs and robust databases to intuitive front-end monitoring dashboards. • 𝐑𝐞𝐚𝐥-𝐓𝐢𝐦𝐞 𝐃𝐚𝐭𝐚 𝐏𝐢𝐩𝐞𝐥𝐢𝐧𝐞𝐬: Construct high-performance data pipelines for real-time market data ingestion, analysis, and signal generation, ensuring your bot acts on the freshest information. • 𝐑𝐢𝐬𝐤 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 𝐈𝐦𝐩𝐥𝐞𝐦𝐞𝐧𝐭𝐚𝐭𝐢𝐨𝐧: Embed advanced risk management features like stop-loss, take-profit, and dynamic position sizing directly into your automated systems. 𝐏𝐫𝐨𝐯𝐞𝐧 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞: 𝐓𝐡𝐞 𝐭𝐫𝐚𝐜𝐤 𝐫𝐞𝐜𝐨𝐫𝐝 In my 8+ years as a software developer, I have a track record of delivering tangible results. I have: • Successfully built and deployed an AI-driven cryptocurrency trading bot that generated a consistent 15% monthly return during a sustained period of market volatility. • Developed a custom-scraped odds engine and automated sports betting system for a client, enabling them to capitalize on over $50,000 in profitable arbitrage opportunities. • Architected and implemented the full-stack infrastructure for a prop trading firm, resulting in a 25% increase in execution speed and a 10% reduction in trading slippage. 𝐌𝐲 𝐀𝐩𝐩𝐫𝐨𝐚𝐜𝐡: 𝐓𝐡𝐞 𝐡𝐮𝐦𝐚𝐧 𝐞𝐥𝐞𝐦𝐞𝐧𝐭 While technology is my tool, my process is built on clear communication and a collaborative approach. I, 𝐀𝐫𝐭𝐲𝐨𝐦, work closely with you to understand your unique strategy and risk tolerance, ensuring the final product is not only technically sound but also perfectly aligned with your financial goals. I believe in delivering scalable, secure, and well-documented solutions that stand the test of time. 𝐂𝐚𝐥𝐥 𝐭𝐨 𝐀𝐜𝐭𝐢𝐨𝐧: 𝐓𝐡𝐞 𝐧𝐞𝐱𝐭 𝐬𝐭𝐞𝐩 Ready to turn your market strategy into a profitable, automated reality? Let's connect to discuss how my full-stack AI and algorithmic trading expertise can drive your success.

Hi I am Renzo Barcos, a Rust Specialist and Fullstack Developer dedicated to building high-performance, secure, and sovereign digital solutions. My expertise lies in the intersection of robust backend systems and decentralized architectures. As the Creator of Slice (Stellar network) and a Maintainer for multiple Open Source Web3 projects, I don't just write scripts, I architect protocols. I bring a "maintainer mindset" to every codebase: prioritizing memory safety, async performance (Tokio), and long-term maintainability. Core Expertise: * Rust Ecosystem: Expert in Rust for both systems programming and Web3. Proficient in building high-concurrency backends, CLI tools, and desktop applications (Tauri). * Blockchain and Smart Contracts: Specialist in Stellar (Soroban), Solana (Anchor), and Starknet (Cairo). Deep understanding of E2EE, cryptographic identity, and DeFi logic. * Fullstack Web3: Seamless integration between smart contracts and modern frontends using TypeScript, React, and Next.js. * Infrastructure and Security: Experienced in PostgreSQL, Docker, and AWS, with a focus on security-by-design (no hardcoded secrets, audit-ready code). Technical Stack: * Languages: Rust (Expert), TypeScript, Solidity, Cairo. * Blockchain: Stellar, Solana, Starknet, EVM. * Backend: Tokio (Async Rust), Axum/Actix, PostgreSQL, Redis, WebSockets. * Frontend and Desktop: React, Next.js, Tailwind CSS, Tauri. * DevOps: Docker, AWS, CI/CD Pipelines. What makes me different: * Active Maintainer: Over 200 contributions to global Web3/DeFi repositories. I understand the rigor required for production-grade decentralized code. * End-to-End Ownership: From architectural design and smart contract deployment to building the final user interface. * Clear Communication: I provide 48-hour progress reports and work based on well-defined milestones to ensure zero surprises. Let’s build the next generation of sovereign applications. Reach out to discuss your project’s architecture.

Why should you choose me: ✅ Top 1% talent on Upwork: I'm part of the proud Expert Vetted Talent pool with earnings 400K plus helping Enterprises and Businesses. My Company Services - sarsoftwareinc.com I am currently working as a Field CTO at Centific for Enterprise AI and also have worked in the past as a BlockChain/NFT/Web3 Engineer, Full Stack developer and Cloud Data / Solution Architect in US. Also I have developed several AI and openAI chatGPT models using custom ML and deep learning algorithms and integrated them with websites, mobile, and desktop apps. I have also recorded chatGPT prompts and conversations and used those data for conversational data analytics also forwarded the responses to API and saved them to the cloud database. Also got great experience in building cloud AI chatbots using Copliot , AWS Lex and Dialogflow. ChatGPT Portfolio: 1. bank-webapp-front-end-service.azurewebsites.net With over 20 years of experience in technology and a focus on Generative AI, Enterprise AI, and Machine Learning, I’ve had the privilege of working with global enterprises such as Genpact, Sapient, and leading retail brands like Sephora and Kohl's. My experience spans a range of innovative projects, including building custom Gen AI models, deploying large-scale Generative AI applications, and enhancing enterprise solutions with ML and DL , CV models. * Also I have extensive experience in developing AI-powered solutions across various platforms, including Google Cloud Platform (GCP), AWS, and Microsoft Azure, leveraging advanced technologies like LLMs, RAG models, and natural language processing. I’ve also designed and developed AI-driven chatbots and other AI applications, helping businesses streamline operations, improve customer interactions, and accelerate digital transformations. In addition to my AI/ML and full-stack experience, I specialize in workflow automation using tools like n8n, Power Automate, and Zapier. I’ve built custom no-code/low-code pipelines that: • Orchestrate complex business logic across CRMs (Salesforce), messaging platforms (Slack, MS Teams), and enrichment tools (Clay, Clearbit). • Automate lead vetting, enrichment, and assignment workflows for high-volume inbound pipelines. • Integrate with OpenAI and third-party APIs to create fully automated content research, generation, and delivery flows. * And I also have more than 7 plus years of experience with Gen AI , Artificial Intelligence, Machine Learning , Computer Vision, Cognitive Services using Python, AWS, MS Azure Machine Learning , Google Cloud Platform and Amazon SageMaker. Build and train custom data using openAI chatGPT models with Q & A ,summarization features. * My work history includes top clients (Google) ranging from start-ups to Fortune 500. Many of the teams are distributed across continents, so I am comfortable working both locally and in international, distributed settings. Currently, I am a member of Upwork Talent Enterprise Clouds in which my clients regularly access my services for innovation and architect new and profitable solutions. My main skills are: - AI Tools - Stable Diffusion Models , GAN , VAE , ChatGPT , Agentic RAG , OpenAI , Generative AI , LangChain , LLM, SLM, Pinecone , Vicuna , Llama2 , BARD , Vertex AI Languages: Python, Solidity , Cadence, Rust , C++ Blockchain and Web3 Development - Web3.js , Node.js , React , Truffle , Ganache , MetaMask Smart-contract integration development: DeFi platforms,, Crypto wallets, NFT Marketplaces Blockchain: Ethereum (ETH) and Binance Smart Chain (BSC), FLOW , Solana, Avalanche Tokens, smart-contract dApps and Blockchain Consulting and dApps Development NLP: NLTK, Spacy Devops : Docker , Kubernetes , Kubeflow NLP Apps : Rasa Chatbot, Amazon Lex , Kendra Cloud Platform : AWS , Azure , GCP Automation - n8n, Power Automate, Zapier , Airflow Blockchain projects: 1. sarsoftwareinc.com/blockchain 2. samedaypay.io 3. apenft.io NFT Marketplace: 1. thetadrop.com/marketplace (EVM) 2. gmdynasty.com Past Web Projects: 1. analogix.com 2. investonmainstreet.com 3. poshberry.com 4. theroomxchange.com 5. theaxleworkout.com 6. theshade.com.au Also, note that I offer more favorable hourly rates for longer-term projects and for retainer consulting. Please inquire, and I will send you a document that has all the details about my consulting rates.

With a decade of experience, I specialize in designing scalable software architectures and system designs for complex products. I help companies plan, design, and implement robust systems — from early architecture decisions to production deployment. I’ve worked across startups and high-growth environments building systems from scratch, modernizing legacy platforms, and designing architectures that scale reliably. Selected Architecture & Engineering Experience • Architect of an AI-led Anki-style flashcard LMS along with its MCP • Led the architecture and migration of a legacy monolith to a modern microservices architecture for a health & fitness startup • Served as Director of Engineering for an NFT issuance and marketplace platform, designing core platform architecture • Designed DevOps architecture, CI/CD pipelines, and cloud infrastructure • Developed allocation algorithms and lifecycle systems for Sukuk bond issuances • Built a cloud-based KYC platform • Maintained 95%+ automated test coverage using Mocha, Chai, and Supertest • Designed and implemented ETL pipelines and backend architecture for an e-commerce platform • Built geospatial systems using Google Maps and ArcGIS/Esri • Prototyped ARKit applications and experimental hardware including a 3D-printed robotic dog I began working professionally during my final year of college and achieved the Upwork Top Rated badge before graduating. Technical Skills Below is a selection of technologies and platforms I have worked with across different projects. This list is not exhaustive, so please feel free to reach out if you are looking for experience with a specific technology or stack. Languages & Frameworks Node.js, JavaScript, React.js, Next.js, React Native, Angular, Flutter, Ruby on Rails, Python, Java, PHP, .NET Core / Web API, C, C#, C++ AI & Robotics MCP Server setup, Arduino, 3D Printed Prototypes, Text to Speech, Prompt Optimisation, Servo Web3 & Blockchain Solidity, DApp Development, Metamask, Web3.js, Smart Contracts Databases PostgreSQL, MongoDB, SQLite, Oracle 10g DevOps & Infrastructure CI/CD Pipelines, Shell Scripting, Firebase, ETL Pipelines Mapping & Geospatial Google Maps, Esri / ArcGIS Tools & Collaboration GitHub, Jira, Figma, Claude Code