7+ years of UX/UI design experience across SaaS platforms, B2B & B2C products, enterprise admin dashboards, and mobile apps, including big clients such as Trimble, Nestle, and Mondelez. 💎 Top 1% Rated Designer on Upwork ✅ 140+ projects across SaaS, e-commerce, fintech, healthcare and enterprise products ⏳ 2,232 hours delivered – consistent quality, clear communication, and reliable results 𝗪𝗛𝗬 𝗠𝗘? I design products that are not just visually sharp but strategically built to convert, retain, and scale. 🌍 Location: Barcelona, Spain (Local time: GMT +2) 𝗪𝗛𝗘𝗥𝗘 𝗠𝗢𝗦𝗧 𝗗𝗘𝗦𝗜𝗚𝗡𝗘𝗥𝗦 𝗦𝗧𝗢𝗣, 𝗜 𝗞𝗘𝗘𝗣 𝗚𝗢𝗜𝗡𝗚 Most designers hand you a Figma file and wish you luck. I don't stop there. I own the full loop — research, IA, high-fidelity UI, and what happens after ship — because my focus isn't "does it look good," it's "did it move the business forward." And I build, not just design. Need a website live? I design it and launch it myself — Webflow, Framer, WordPress, Shopify, Squarespace, or Wix — no handoff to a separate developer, no gap where things get lost in translation. Need a working prototype fast, not just clickable screens? I use Cursor and Claude Code to turn designs straight into functioning code. One person, one process, no bottlenecks between design and something real in your hands. 𝗖𝗢𝗥𝗘 𝗙𝗢𝗖𝗨𝗦 The clients I work best with are product teams and founders who need a UX/UI designer operating at both strategic and execution levels. I am equally comfortable running a UX audit, building a design system from scratch in Figma, or owning the full web design process from brief to handoff. My creative direction background means I think about brand, narrative, and conversion alongside usability. 𝗠𝗬 𝗦𝗘𝗥𝗩𝗜𝗖𝗘𝗦 𝗜𝗡𝗖𝗟𝗨𝗗𝗘 🔍 UX research & flow mapping 🖥️ SaaS & B2B admin dashboards — filters, data tables, permission flows 📱 Mobile app UX/UI (iOS & Android) 🌐 Website design & full builds (Webflow, Framer, WordPress, Shopify, Squarespace, Wix) 🧩 Design systems — Figma variables + dev handoff docs 📋 UX audits — prioritized, written reports 𝗧𝗢𝗢𝗟𝗦 𝗧𝗛𝗔𝗧 𝗜 𝗨𝗦𝗘 🎨 Design & No-Code: Figma (expert) · Adobe XD · Illustrator · Photoshop · Miro · InVision · Zeplin · Axure · Webflow · Framer · WordPress · Shopify · Squarespace · Wix 🤖 AI: Figma Make · ChatGPT · Claude · Midjourney · Cursor · Claude Code 💬 Communication & Workflow: Slack · Notion · Loom · Zoom · Google Meet · Jira Based in Barcelona, working in English, Spanish, Russian and Ukrainian — easy overlap with EU and US hours. Tell me about your project — I'll reply shortly!

• 20 years in development • 50+ shipped products – from startups to Fortune 500 • MVPs built from scratch to App Store • 300K+ active users in the 1ˢᵗ year, $16M Series B • Full-cycle development • Transparency, reliability, ownership.  I help businesses carry their projects from idea to the App Store and beyond; craft MVPs that attract investors; build full app infrastructures; and win users through thoughtful design, usability, visual aesthetics, and performance. With a strong IT foundation grounded in higher mathematics, 20+ years of software engineering experience, and broad expertise across technologies, frameworks, and app types, I identify potential pitfalls early, offer strategic recommendations, and handle the full cycle of research, development, and long-term support — ensuring your app not only works, but works deeply well. Fair play, clear communication, solid responsibility, and high-quality output are included. 🔬 𝗙𝗢𝗖𝗨𝗦 𝗔𝗥𝗘𝗔𝗦 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯     • Mobile business applications     • Location-based services and systems (LBS)     • AI-enabled solutions, AI agents & workflows     • Extended & augmented reality (XR & AR)     • Startups; rapid MVP development. 🎾 𝗦𝗘𝗥𝗩𝗜𝗖𝗘𝗦 & 𝗘𝗫𝗣𝗘𝗥𝗧𝗜𝗦𝗘 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯     • Product discovery & scoping (requirements, research, cost/time estimation)     • Technical due diligence & audits     • System, data & mobile architecture     • Geospatial features & location intelligence (geofencing, routing, map UX)     • AI/LLM & agentic flows (on-device; GPT APIs integration, LangChain/LlamaIndex)     • Data modeling, database design & integration     • APIs, backend & cloud/PaaS integration (AWS, GCP, Firebase, Supabase, Cloudflare)     • Identity & access management (native/federated; Cognito/Firebase/Supabase Auth)     • End-to-end iOS development (apps, widgets, extensions)     • Monetization (in-app purchases, subscriptions, ads)     • Hardware integrations (Bluetooth, camera, sensors, location)     • UX design & usability optimization     • Localization & internationalization (incl. RTL)     • CI/CD & release engineering     • Performance, reliability & observability     • Documentation, handover & post-launch support. 🗂️ 𝗕𝗔𝗖𝗞𝗚𝗥𝗢𝗨𝗡𝗗 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯     • Systems analyst at Accenture, Intesa Sanpaolo & Renaissance Capital in the past     • Ex-PL/SQL, C/C++ full-time developer (fintech & state property security)     • MS in Applied Mathematics & Computer Science. 🧰 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 & 𝗧𝗢𝗢𝗟𝗦 (𝗞𝗘𝗬𝗪𝗢𝗥𝗗𝗦) ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯     • Swift, Objective-C; SwiftUI, UIKit; Combine, modern concurrency, async/await, actors, GCD, OperationQueue;     • AI, large language models (LLM), machine learning (ML) integration; OpenAI, LangChain, LlamaIndex, Zapier integration; AI agents; geospatial services, location-based services (LBS);     • SQLite, SQLite, PostgreSQL, PostGIS, CoreData, SwiftData; SQL, PL/pgSQL; Keychain, Secure Enclave;     • CoreLocation, CoreBluetooth, AVKit, MapKit, ARKit, RealityKit, CoreML, StoreKit, SpriteKit, Speech, WeatherKit; RevenueCat, MapBox, Bloomreach;     • MVVM, MVP, MV*, TCA, Clean Architecture, dependency injection (DI);     • background tasks, push notifications (APNs, FCM, SNS), widgets, app extensions; Swift Package Manager (SwiftPM), CocoaPods (pods);     • Firebase (Auth, Remote Config, Analytics, Crashlytics, FCM, App Check, Distribution), AWS (Cognito, S3, SNS, Lambda, API Gateway, RDS), Supabase (Auth, Database, Edge Functions, Storage); Cloudflare R2 Storage; Mapbox; RevenueCat;     • REST API, WebSockets; JSON, GraphQL; OpenAPI/Swagger; JSON Web Tokens (JWT); XMPP;     • Swift Testing, XCTest, Appium, OCMock;     • Xcode Instruments, VSCode, Antigravity, Docker, profiling, optimization, CI/CD (GitHub Actions, CircleCI; Fastlane); App Store Connect, TestFlight; Git (GitHub, GitLab, Bitbucket), SVN; Figma, Pixelmator; Notion, Jira, Linear; ngrok; Postman; pgModeler, pgAdmin, DataGrip, DBeaver; VS Code; Sentry, Zabbix; Mixpanel.

I possess a strong dedication to my work, backed by over 15 years of valuable experience in mobile and web application development. My expertise extends across multiple programming languages, notably Objective-C and Swift, where I have demonstrated proficiency. Additionally, I have acquired 6+ years of experience in Android development using Java and Android Studio, 2 years in React-Native, and over 15 years in web and PHP development, encompassing backend server implementation, MySQL database management, and utilization of Firebase. My skill set encompasses not only the ability to architect scalable code and construct robust software logic but also includes adeptness in debugging and testing within diverse environments. I adhere to the belief that quality aligns with value, which compels me to go the extra mile for the projects and clients I collaborate with. I eagerly anticipate engaging with both new clients and my existing and past clients on future ventures, continuing to deliver exceptional outcomes.

I have been a mobile application developer for 11+ years across Android, iOS, Unity, and React. My mobile application development skills are spread across a broad range of fields. I have developed applications for universities, public health authorities, county governments, FDA-regulated companies and many other disciplines. My skills are mainly in React, Unity (C#), Java, Kotlin (Android), Objective-C and Swift (iOS). I also have experience with Firebase, Oracle SQL, Python, and JavaScript applications.

If you need secure AI solutions, PKI infrastructure, digital signature systems, IAM integration, or cryptography-based applications, you’re in the right place. I am an AI Security Engineer and PKI Specialist with 15+ years of experience building secure enterprise systems for organizations that require strong identity, data protection, compliance, and digital trust. I specialize in combining modern AI technologies with enterprise security practices, including PKI, Digital Signatures, Identity & Access Management, Cryptography, HSM integrations, and secure application development. I help businesses design, build, and improve security-focused solutions that protect sensitive data, secure digital transactions, and support compliance requirements. 𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐁𝐮𝐢𝐥𝐝 𝐅𝐨𝐫 𝐘𝐨𝐮 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐒𝐞𝐜𝐮𝐫𝐞 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 I develop secure AI-powered applications using modern architectures designed for enterprise use cases and sensitive data handling. This includes AI chatbot systems, Retrieval Augmented Generation (RAG) solutions, secure AI assistants, and private knowledge-base AI systems. I also integrate AI into enterprise platforms through secure API-based workflows and backend systems. 𝐏𝐊𝐈 & 𝐃𝐢𝐠𝐢𝐭𝐚𝐥 𝐒𝐢𝐠𝐧𝐚𝐭𝐮𝐫𝐞 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 I design and implement complete PKI-based systems for secure digital trust and identity verification. This includes Certificate Authorities (CA), Registration Authorities (RA), certificate lifecycle management, certificate issuance and validation, OCSP, TSA integration, and enterprise digital signature platforms. 𝐂𝐫𝐲𝐩𝐭𝐨𝐠𝐫𝐚𝐩𝐡𝐲 & 𝐇𝐒𝐌 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 I build secure cryptographic systems focused on encryption, decryption, and enterprise key management. This includes Hardware Security Modules (HSM), cloud HSM integrations, secure signing operations, and hardware-backed security systems for sensitive environments. 𝐈𝐝𝐞𝐧𝐭𝐢𝐭𝐲 & 𝐀𝐜𝐜𝐞𝐬𝐬 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 (𝐈𝐀𝐌) My expertise includes cryptography, HSM integration, and identity & access management systems using tools like Keycloak, Auth0, Okta, and Azure AD. I design secure authentication systems using SAML, OAuth2, and SSO for enterprise environments. I develop backend systems using Python for AI-driven applications, secure APIs, and enterprise-grade solutions, along with .NET where required for secure enterprise integrations and legacy systems. 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞 Clients choose me for my deep experience in security-focused engineering and ability to deliver systems that are both scalable and compliant. I focus on building long-term, production-ready solutions rather than short-term implementations. I bring experience across AI systems, PKI infrastructure, cryptographic security, and enterprise application development, ensuring all solutions are secure, reliable, and maintainable. If you are looking for an AI Security Engineer, PKI Specialist, Cryptography Engineer, or Digital Signature Developer who can build secure enterprise solutions, feel free to send me a message or invite me to your project.

Most developers will tell you they have worked with AI APIs. I built a computer vision model, deployed it to SageMaker, and wired a continuous retraining loop so it gets smarter from every user interaction. That same production discipline runs across all my work: three live Supabase and Next.js apps, federal data pipelines for CBP and FEMA, and a personalization engine that hit 87% adoption in three months at a company with millions in revenue at stake. I have been shipping production software for 9 years. Not prototypes. Not client demos that get handed off and forgotten. Systems with real users, real uptime requirements, and real consequences when something breaks. These are systems I architect, build, deploy, and maintain myself. What that means for you: I make decisions with production in mind from day one. Schema design that holds up at scale. RLS policies that actually protect your data. CI/CD configured before the first feature ships. Architecture you can build on after I hand it off. My current stack centers on Supabase, Next.js, TypeScript, and Python/FastAPI, the same tools I use in my own products every day. I also work extensively with React Native for cross-platform mobile, AWS for infrastructure and ML workloads, PostgreSQL for complex data models, and Redis for caching and real-time systems. Recent work includes: Building and operating three live SaaS products on Supabase and Next.js generating $4k+ per month in real revenue. Designing and deploying a PyTorch image classification model on AWS SageMaker with an automated weekly retraining pipeline driven by live user feedback, achieving 88% accuracy. Building automated federal data pipelines for CBP, ICE, and FEMA that reduced manual processing from two days to 15 minutes. Leading a personalization engine at DealerOn that went from 0% to 87% dealer adoption in three months and became a new paid revenue stream. Supporting HIPAA and SOC2 compliant systems at Vault Health processing millions of clinical tests weekly. I work best on projects where the technical decisions actually matter -- where a naive implementation will cost you later and you want someone who has already made the mistakes and learned from them on their own products rather than yours. I hold a B.S. in Computer Science from UT Austin and am AWS Solutions Architect and Azure Developer certified. If you are building something real, let's talk about it.

Highly skilled and goal-driven software engineer with over 20 years of expertise in building secure applications. Extensive experience in developing mobile and web applications for MVP and enterprise projects. Demonstrates excellent skills in clean design and coding practices. Actively seeking a challenge with an innovative company dedicated to creating a safe, interoperable, immersive, and optimized experience. Care deeply about interoperability for the personal data. * Technical Experience: - LLM x RAG pipeline development and CI/CD. - DICOM, FHIR Health Care System integration and supporting interoperability - Wallet Impelentation and SDK development working with Google and Samsung. - iOS/Android Development( Native / React Native ) - Embedded Software Development ( Driver, HAL development ) - Web Application Development ( Medical Service Interface, CMS, AR / VR support for the web ) *Certifications: - HL7 FHIR Certified - CCNA Certified - Sun Java Certfieid

👋 Hello! Product-focused engineer with 10+ years of experience building and scaling real-world products. I bring a get-it-done mindset and a passion for making technology and processes smarter, faster, and more efficient, whether through AI-driven innovation or proven engineering methods. 👉 You can expect quick turnaround, timely updates about your project with full transparency ✅ I'm quite flexible with how we can work together 👉 You can hire me as solo freelancer. 👉 If you have an existing team in-house or a team of freelancers I have no problem jumping in quickly learning the ropes and becoming a part of a team. 👉 Also I am able to assemble a team fast to expedite the project according to your specific needs. Software Engineer | AI First Engineering | Agentic Workflows | Product Focused, Business Minded | Engineering Lead and Fractional CTO 👉 I’ve spent the last decade building software and leading teams, and I’ve gotten pretty good at both. I’m hands-on by nature, whether that means jumping into code, sorting out a tricky planning problem, or handling whatever else needs doing. I don’t sit back and delegate everything. When something needs to get done, I’m always there to lend a hand. Led teams of 20+ people across front-end, back-end, QA, and design. I know how to get different groups working together without the usual friction, and I’ve learned how to spot problems before they become real problems. I’m comfortable being the one who talks directly to clients or stakeholders, turning vague “we need something that does X” into clear requirements we can build. I’ve done this enough times to know what questions to ask and when to push back. 👉 Ran projects from kickoff to delivery: scoping, planning, coordinating between teams, and keeping things on track and on budget. I’ve used Agile, I’ve used Waterfall, and I’ve used whatever made sense for the project. Process matters, but only when it actually helps. Good at building trust with the people I work with, both my team and the stakeholders expecting results. I know how to have difficult conversations when they’re needed, and I know how to keep people motivated when things get tough. At the end of the day, my job is to make sure the work gets done well and that people actually want to keep working together 👉 Lately focused on AI and automation adoption, integrating LLMs, AI-powered features, and workflow optimization to drive measurable results. Experienced with OpenAI (GPT, Codex) and Anthropic (Claude, Claude Code), delivering intelligent automation and data-driven systems that enhance productivity and decision-making. Hands-on with AI agents, prompt engineering, and automation workflows, building AI-powered features that scale and improve team velocity, development or otherwise

Looking for a backend expert who can build robust web and desktop applications with scalable architecture? I’m a Backend Developer specializing in .NET, C#, Go, and cloud platforms, with 15+ years of experience delivering high-performance solutions. I combine deep technical expertise with practical architecture design, ensuring your projects are reliable, maintainable, and future-ready. - 15+ years of experience in Software Engineering - 4+ years average project duration - I’ve worked across various industries, including Retail, Healthcare, Fintech, and Sports - Created ERP, CRM, POS systems, complex web platforms, and desktop applications. - My experience also covers system architecture, requirements analysis, and deployment pipelines, helping businesses optimize workflows and scale efficiently. - Specialize in full lifecycle development (SDLC) and high-performance solutions with .NET, Go, and React - Design and implement distributed systems, AI-driven applications, cloud-native platforms, - Ensure secure, efficient, and resilient systems, including web portals, APIs, mobile apps, and IoT integrations Core Technologies & Skills: - Languages: C#, TypeScript, Go, C++ - Frameworks: .NET Core, ASP.NET MVC, Tauri, Gin, Avalonia, Blazor - Architecture & Design skills: Solution Architecture Principles, Design Patterns, DevOps and CI/CD Pipelines, Security and Compliance, Integration Architectures, Performance & Scalability Design, Data and Storage Architectures - Databases: Microsoft SQL, PostgreSQL, CosmosDB, Redis, Azure SQL - Front end: React, Next.js, Tailwind - Cloud Services: Azure, AWS, Vercel, Netlify, Supabase - Other: Rust, Docker, PlatformIO, Unity3D, Swift, Augmented Reality, TUI, IoT If you need someone who can turn complex backend requirements into scalable, high-performance applications, I’ll help bring your project to life. Explore my portfolio of projects delivered with my team at MobiDev, helping businesses across North America and Europe achieve their software goals.

React and Ruby On Rails expert designing full stack web applications using AWS and Firebase, as well as many other modern technologies. Experienced in building scalable systems serving 1,000,000+ users. Passionate about writing high quality code that is easily understood and scalable. The best line of code is one that can be removed. The best library is one that can be replaced with a native API.