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𝐈 𝐚𝐦 𝐚 𝐒𝐞𝐧𝐢𝐨𝐫 𝐀𝐈 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭 𝐚𝐧𝐝 .𝐍𝐄𝐓 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 𝐰𝐢𝐭𝐡 𝟐𝟎+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 building production software across 𝐠𝐨𝐯𝐞𝐫𝐧𝐦𝐞𝐧𝐭, 𝐡𝐞𝐚𝐥𝐭𝐡𝐜𝐚𝐫𝐞, 𝐭𝐫𝐚𝐧𝐬𝐩𝐨𝐫𝐭, 𝐞𝐧𝐭𝐞𝐫𝐩𝐫𝐢𝐬𝐞, 𝐚𝐧𝐝 𝐒𝐚𝐚𝐒 𝐞𝐧𝐯𝐢𝐫𝐨𝐧𝐦𝐞𝐧𝐭𝐬. My core strength is designing reliable systems that combine mature enterprise engineering with modern AI. I work across architecture, backend development, legacy modernization, agentic AI, private LLM deployment, and self-hosted inference infrastructure. Recent work includes: • Architecting a role-specialized multi-agent platform with an approximately 30,000-line Python runtime • Building and operating a 6-node, 10-GPU local inference environment with approximately 496 GB VRAM • Deploying large language models using vLLM, SGLang, tensor parallelism, FP8, and NVFP4 quantization • Pruning and publishing a Qwen3.5-397B-A17B model that reached more than 1,000 Hugging Face downloads • Building multimodal AI assistants with web search, image generation, vision, and video understanding • Maintaining a .NET 9 and Next.js multi-tenant workshop platform evolving into a commercial SaaS product Before moving deeply into AI, I spent two decades delivering business-critical .NET systems, including Estonian government registries, court systems, hospital software, transport platforms, and national X-Road and eID integrations. 𝗜 𝗰𝗮𝗻 𝗵𝗲𝗹𝗽 𝘄𝗶𝘁𝗵: • 𝗔𝗜 𝘀𝘆𝘀𝘁𝗲𝗺 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 𝗮𝗻𝗱 𝗺𝘂𝗹𝘁𝗶-𝗮𝗴𝗲𝗻𝘁 𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀 • 𝗣𝗿𝗶𝘃𝗮𝘁𝗲 𝗮𝗻𝗱 𝗹𝗼𝗰𝗮𝗹 𝗟𝗟𝗠 𝗱𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁𝘀 • 𝗥𝗔𝗚, 𝗺𝘂𝗹𝘁𝗶𝗺𝗼𝗱𝗮𝗹 𝗔𝗜, 𝗮𝗻𝗱 𝗶𝗻𝘁𝗲𝗹𝗹𝗶𝗴𝗲𝗻𝘁 𝗮𝘀𝘀𝗶𝘀𝘁𝗮𝗻𝘁𝘀 • 𝗖#, .𝗡𝗘𝗧, 𝗔𝗦𝗣.𝗡𝗘𝗧 𝗖𝗼𝗿𝗲, 𝗪𝗲𝗯 𝗔𝗣𝗜𝘀, 𝗮𝗻𝗱 𝗣𝘆𝘁𝗵𝗼𝗻 • 𝗟𝗲𝗴𝗮𝗰𝘆 .𝗡𝗘𝗧 𝗺𝗼𝗱𝗲𝗿𝗻𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝗰𝗼𝗺𝗽𝗹𝗲𝘅 𝗱𝗲𝗳𝗲𝗰𝘁 𝗿𝗲𝘀𝗼𝗹𝘂𝘁𝗶𝗼𝗻 • 𝗗𝗼𝗺𝗮𝗶𝗻-𝗱𝗿𝗶𝘃𝗲𝗻 𝗱𝗲𝘀𝗶𝗴𝗻, 𝗰𝗹𝗲𝗮𝗻 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲, 𝗮𝗻𝗱 𝘁𝗲𝘀𝘁-𝗱𝗿𝗶𝘃𝗲𝗻 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝗦𝗤𝗟, 𝗦𝗤𝗟 𝗦𝗲𝗿𝘃𝗲𝗿, 𝗗𝗼𝗰𝗸𝗲𝗿, 𝗟𝗶𝗻𝘂𝘅, 𝗮𝗻𝗱 𝘀𝗲𝗹𝗳-𝗵𝗼𝘀𝘁𝗲𝗱 𝗶𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 I am best suited to technically demanding projects where reliability, maintainability, security, and clear architectural thinking matter. Send me your current architecture, challenge, or product idea, and I will give you an honest technical assessment of the best path forward. :)

Making my way in IT world (so far webstores, automation, robotics), bringing extensive experience in finance, investing and aviation with me.

As a React Developer and Full Stack Developer I build custom Web Application products for B2B clients, from interface to backend. Most of my work is Full Stack Developer React Node delivery, where a React frontend and a Node.js backend support one business workflow end to end. As a Node.js Developer I own the REST API logic, authentication, roles and permissions, and the data layer behind each product. My focus is practical Web Application Development that ships, scales, and stays maintainable, with clean API Integration at the core. Across 14+ years and 130+ completed projects I have built 60+ SaaS, CRM and dashboard products, 40+ admin panels and client portals, and 200+ REST API integrations. As a React Developer and Full Stack Developer with experience leading development teams of up to 6, I have shipped for 50+ EU and US B2B clients across SaaS platforms, CRM systems, marketplaces, booking websites and API Integration projects. As a React Developer I build Web Application interfaces with React.js, Next.js, TypeScript and Responsive UI , wired to live data through API Integration . As a React Frontend Developer and Frontend Developer I deliver usable, fast interfaces — data tables, filters, admin panels and client portals. On the backend side, as a Node.js Developer and Backend Developer I build the REST API layer, ExpressJS services, authentication, roles and permissions, payment flows and CRM integrations. Many clients come to me as a Node.js Developer when a frontend already exists but the API, the data model and the business logic need to be done right. As a Backend Developer I keep the Node.js layer predictable and documented, and as a Node.js Developer I handle the API Integration between third-party services, the database and the frontend. A typical Full Stack Developer React Node project for me looks like this: a SaaS platform or internal business tool with a React frontend, a Node.js backend, a structured database and an admin workflow for the team behind it. On every Full Stack Developer React Node build I design the database structure, the REST API , the dashboards and the permissions model so the product holds up as it grows. This Full Stack Developer React Node approach keeps frontend and backend in one system. Hiring one Full Stack Developer React Node engineer also keeps the React Developer and Node.js Developer decisions consistent across the whole build. I also work as a Directus Developer and Headless CMS Developer . On 20+ content-driven and data-heavy products I use Directus CMS or Strapi as a headless backend, which gives clients a clean admin panel and an API-ready foundation. As a Directus Developer I model the data, set roles and permissions, and connect a React frontend through REST API ; as a Strapi Developer I do the same on Strapi. Headless CMS work with Directus CMS pairs naturally with my React Developer and Node.js Developer delivery. Stack I use daily: React, React.js, Next.js, Node.js, TypeScript and JavaScript on the application side; ExpressJS, REST API and API Integration on the service side; SQL, MySQL, MongoDB, Firebase and Supabase for data; Directus CMS and Strapi for headless content. Authentication, roles and permissions, payment flows, dashboards, data tables, filters and admin workflows are standard parts of how I deliver Web Application Development . How I work on a Full Stack Developer React Node project: discovery and scope first, then architecture and backlog, design where needed, development in sprints, QA on staging, production release, and support after launch. As a Web Developer with 14+ years behind me, my main promise is delivery predictability — clear scope and no surprises. As a JavaScript Developer I write code the next developer can actually read and extend. Typical projects clients hire me for: SaaS platform development, CRM systems, admin panels, marketplaces, booking websites, lead generation websites, dashboards, client portals, internal business tools, e-commerce platforms and API-based Web Application work with workflow automation and business automation. Clients also find me under related searches that match my real stack. On the React side: React Native Developer , React Native App Developer , React Next.js Developer , React Developer Firebase , and Full Stack Developer Supabase React . On the full stack side: Python Full Stack Developer , Full Stack Developer AI , Full Stack Developer Shopify , Full Stack React , Full Stack Node.js React and Node.js React . On the backend: Node.js Backend Developer and Back End Developer Node.js . I also fit Front-End Developer Full-Stack , Python Developer , WordPress Developer , Mobile App Developer and Senior Full Stack Developer . If you need a React Developer , a Full Stack Developer React Node engineer, or a Node.js Developer for a serious product, I can take it from architecture through release and support. Let's talk about your product and what it needs to do.

Over the past 18 years in IT, and 12 of those running my own practice, I've worked as an AWS Engineer and an AWS Solution Architect on the same projects more often than not, holding both AWS certifications (Professional and Associate) plus the AWS Security Specialty. Clients started calling me an AWS Solution Architect because I was the one sketching the diagram before anyone touched a resource, and they kept calling me an AWS Engineer because I was also the one who ended up building it. Across 50-plus projects for 20-plus clients, that mix is still what people hire me for: someone who can be the AWS Solution Architect and the AWS Engineer on the same engagement instead of two separate people who barely talk. - Core AWS: Lambda, API Gateway, DynamoDB, S3, CloudFront, MediaConvert, Glue - Infrastructure as code: CloudFormation, Terraform - Security and identity: IAM, Cognito, GuardDuty, Security Hub - Data and analytics: EMR, Kinesis, SageMaker, Athena None of that architecture means much if it can't ship reliably, which is the part DevOps covers. I build the CI/CD pipeline alongside the infrastructure on almost every project, because splitting DevOps from architecture usually just means both suffer. I bring the same DevOps habits to every engagement: automate anything repeatable, monitor anything fragile, and make deployments boring instead of a weekly gamble. Teams usually reach out for DevOps help specifically once releases start feeling risky, or once nobody's quite sure why the pipeline breaks every third deploy. The DevOps side of things doesn't really change between serverless and containerized stacks, only the tools do. - CI/CD: CodePipeline, CodeBuild, CodeDeploy - Containers: Docker, Kubernetes, Helm - IaC for deployment consistency: CloudFormation, Terraform Identity tends to be the part teams get wrong quietly, for years, which is why I also work as a Keycloak professional alongside everything above. As a Keycloak professional, I've replaced tools like Okta with custom setups that cost a fraction as much and actually fit the rest of the AWS architecture instead of bolting on next to it. Companies usually bring in a Keycloak professional once logins have gotten messy across several applications that grew up independently, and untangling that is a problem I genuinely like solving. Every Keycloak professional engagement I take starts the same way, with an audit of what's already there before I touch a single realm. - Cut identity management costs by 90% moving a client off a proprietary identity provider - Delivered 41% in cloud cost savings for a finance company - Built a full video platform in under 600 hours - Launched an AI assistant in 3 months at a fraction of typical cost - Migrated a production environment to a new AWS region with zero downtime If your team needs an AWS Engineer who can also own the architecture decisions, or an AWS Solution Architect who sticks around past the diagram and into the build, that's usually the role I end up playing. I've been brought on as the AWS Engineer on projects that already had an architect, and I've been brought on as the AWS Solution Architect on projects that just needed direction before anyone touched AWS at all; either way, the same person ends up doing both by the second week. The same goes for DevOps and identity: I'd rather set up a deployment pipeline once, correctly, than keep firefighting the same release every week, and if Keycloak or single sign-on is anywhere in the picture, having a Keycloak professional involved early saves a lot of rework later. Most engagements that start with me as an AWS Engineer or an AWS Solution Architect end up needing DevOps support too, plus a Keycloak professional layered in wherever identity is part of the scope. That's the actual range on any given week: AWS Engineer work, AWS Solution Architect work, DevOps work, and Keycloak professional work, whichever the project needs most at that stage.

𝐈 𝐞𝐦𝐩𝐨𝐰𝐞𝐫 𝐭𝐞𝐚𝐦𝐬 𝐭𝐨 𝐬𝐡𝐢𝐩 𝐟𝐚𝐬𝐭𝐞𝐫 𝐭𝐡𝐫𝐨𝐮𝐠𝐡 𝐩𝐫𝐨𝐯𝐞𝐧 𝐀𝐈-𝐀𝐮𝐠𝐦𝐞𝐧𝐭𝐞𝐝 𝐐𝐀 & 𝐚𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 𝐲𝐨𝐮 𝐜𝐚𝐧 𝐭𝐫𝐮𝐬𝐭. 𝐓𝐨𝐨𝐥𝐬: Playwright | Selenium | Cypress | Appium | NightwatchJS | ACCELQ | Mabl | Testim 𝐖𝐨𝐫𝐤𝐅𝐥𝐨𝐰: BrowserStack | GitHub Actions | Jenkins | GitLab | Dockers | CI/CD | Framework design 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬: AWS | ISTQB-CTFL | CSM | CSPO 🧪𝐌𝐚𝐧𝐮𝐚𝐥 𝐐𝐀: Requirment Analysis | Test Cases Design | Test Execution | Cross-Browser Testing | Bug-Reporting / Follow-up 🤖 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐞𝐝 𝐓𝐞𝐬𝐭𝐢𝐧𝐠 𝐓𝐨𝐨𝐥𝐬: Playwright | Selenium | Cypress | Appium | NightwatchJS | Ranorex | JMeter | k6 🧰 𝐎𝐭𝐡𝐞𝐫 𝐓𝐨𝐨𝐥𝐬 & 𝐃𝐞𝐯𝐎𝐩𝐬: TestRail | TestMo | XRay | JIRA | BugZilla | Jenkins | TeamCity | GitHub Actions 🏅𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬: - 𝐈𝐒𝐓𝐐𝐁-𝐂𝐓𝐅𝐋 - 𝐀𝐖𝐒 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝 𝐂𝐥𝐨𝐮𝐝 𝐏𝐫𝐚𝐜𝐭𝐢𝐭𝐢𝐨𝐧𝐞𝐫 - 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝 𝐒𝐜𝐫𝐮𝐦 𝐌𝐚𝐬𝐭𝐞𝐫 - 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝 𝐒𝐜𝐫𝐮𝐦 𝐏𝐫𝐨𝐝𝐮𝐜𝐭 𝐎𝐰𝐧𝐞𝐫 🚀 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: - 𝐓𝐞𝐬𝐭 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬: Build robust, scalable testing architectures using Modern tools - 𝐂𝐨𝐦𝐩𝐥𝐞𝐱 𝐏𝐫𝐨𝐜𝐞𝐬𝐬 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧: Streamline intricate testing workflows with all possible integrations - 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐀𝐬𝐬𝐮𝐫𝐚𝐧𝐜𝐞 𝐋𝐞𝐚𝐝𝐞𝐫𝐬𝐡𝐢𝐩: Ensure exceptional user experiences across all platforms 🎯 𝐖𝐡𝐚𝐭 𝐈 𝐎𝐟𝐟𝐞𝐫: - 𝐅𝐮𝐥𝐥-𝐂𝐲𝐜𝐥𝐞 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐀𝐬𝐬𝐮𝐫𝐚𝐧𝐜𝐞 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬: Complete E2E QA coverage from planning to post-release. - 𝐂𝐮𝐬𝐭𝐨𝐦𝐢𝐳𝐞𝐝 𝐓𝐞𝐬𝐭 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬: Tailored automation frameworks for your tools and workflows - 𝐂𝐨𝐦𝐩𝐫𝐞𝐡𝐞𝐧𝐬𝐢𝐯𝐞 𝐀𝐏𝐈 𝐚𝐧𝐝 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐓𝐞𝐬𝐭𝐢𝐧𝐠: Thorough validation of APIs, logic, and data integration. - 𝐂𝐈/𝐂𝐃 𝐖𝐨𝐫𝐤𝐟𝐥𝐨𝐰 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧: Embed QA in CI/CD for faster, safer releases. - 𝐂𝐫𝐨𝐬𝐬-𝐅𝐮𝐧𝐜𝐭𝐢𝐨𝐧𝐚𝐥 𝐂𝐨𝐥𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐢𝐨𝐧: Work closely with teams to ensure continuous quality. If you are looking for a QA expert who delivers high-quality, scalable testing solutions that boost development efficiency and ensure product reliability, let’s connect! I look forward to collaborating. 𝐒𝐚𝐫𝐟𝐫𝐚𝐳 𝐇𝐮𝐬𝐬𝐚𝐢𝐧

I'm a Full Stack Developer React Node, SaaS Developer, and Node.js Developer with 15 years of experience, covering Full-Stack development, SaaS development, Mobile App Development, and AI Automation. A few facts about me: 🏆 100% Job Success score 🏆 125+ projects delivered from MVP to enterprise projects 🏆 10,000+ active users across delivered projects 🏆 Senior Full stack developer with expertise in react and node js What I can develop: ✔️ B2B, B2C, AI-powered, Multi-tenant SaaS platforms as a SaaS developer with experience in 50+ SaaS Platform development ✔️ AI Automation, AI workflows, AI Chatbot and AI Agent Development that reduces manual operations by up to 70% ✔️ Prototype and proof of concept development saving 40% of budget as a Full Stack node.js react developer ✔️ Custom CRM and ERP systems, Internal tools and other management solution cutting admin costs by 40% as a Full Stack Developer React Node ✔️ Booking systems and booking platforms that boosting daily bookings by 30% ✔️ Marketplaces, E-commerce and fintech platforms that boosting sales conversions by 25% ✔️ Admin panel, admin dashboard, and analytics dashboard with charts that cutting reporting time by 60% ✔️ Custom scalable Web Application, website and other Web Development projects driving 40% more organic traffic as a Full Stack Web Developer ✔️ Mobile applications from design to iOS and Android App Development, covered by React Native developer and Mobile App developer ✔️ Code audit, Software Architecture & Design, production delivery, debugging, and production bug fixing, reducing errors by 40%. ✔️ role-based access, payment flows, billing and subscription logic, cutting failed payments by 30% ✔️ User Authentication, user management systems, system administrator, and business operations workflows for 10,000+ users Why clients choose me as a Technical partner: ✔️ SaaS MVP development in 4–6 weeks ✔️ AI-first approach using Cursor, Claude Code, Codex, and Lovable for up to 30% faster development as a Full Stack Developer React Node ✔️ AI Development and AI App Development experience across 35+ AI-powered projects ✔️ Improving page load speed by 55% as a Front End developer React ✔️ Increased database/API response speed by 5x as a Node.js backend developer and Node.js Developer ✔️ Built 120+ API endpoints, microservices, and serverless functions as a MERN Stack developer and javascript developer ✔️ Managed 500K+ records with Database Architecture, Database Design, Prisma, and RLS ✔️ Supported 99.9% uptime with cloud deployment and production deployment ✔️ Reduced deployment failures by 30–40% through CI/CD and release automation ✔️ Improved user experience, engagement, and visibility through dashboards used by 10K+ users As a Senior Full Stack Developer React Node and SaaS Developer, I have 15+ years of experience with: ⚙️ JavaScript, TypeScript, Python ⚙️ React, Next.js, App Router, Vite, Vue.js, Angular, Redux, jQuery, HTML, HTML5, CSS, CSS 3, Canvas ⚙️ Node.js, NestJS, ExpressJS ⚙️ Tailwind CSS, Material UI, Bootstrap, Shadcn/ui ⚙️ SQL, PostgreSQL, MySQL, MongoDB, Supabase, Firebase, Firestore, Redis, Prisma, RLS, Auth ⚙️ Amazon Web Services, AWS S3, AWS Lambda, Google Cloud Platform, Microsoft Azure, Vercel, Railway, DigitalOcean, Cloudflare, Docker, Kubernetes ⚙️ Testing (Jest, Playwright), Monitoring (Sentry), Logging ⚙️ Git (GitHub, GitLab, Bitbucket) ⚙️ LLM, LangChain, RAG, Artificial Intelligence ⚙️ Zapier, n8n, Make, GoHighLevel, GHL ⚙️ HIPAA, GDPR, SOC 2 ⚙️ Figma, Adobe XD, Sketch As a Senior Full Stack Developer React Node and Node.js Developer I have deep experience in API integration: RESTful API, third-party REST API, webhooks, OpenAI API, Stripe API, Twilio API, Anthropic Claude API, ElevenLabs API, ChatGPT API, GraphQL API, WhatsApp business API, Google OAuth, and various Google APIs. As Full Stack Developer React Node and SaaS developer I experience in projects for: Hospitality, Travel, Healthcare, Fitness, Ecommerce, FinTech, Logistics, Finance, Education, E-learning, Retail, HR, Business Services, Media & Entertainment, AI, SaaS marketing, Real Estate platform, etc. 💪 As CTO of Malevich Studio, I can provide: ✔️ UX & UI / Web Design: UI UX Designer support with Figma, Responsive Design, Adaptive Web Design, Software Design, Graphic Design and Adobe Photoshop for 25–40% conversion improvement ✔️ Shopify, PHP or WordPress developer and cms developer for mobile friendly website support ✔️ Python developer and Full Stack developer Laravel Vue Other skills: Application Improvement, Software Development, Software Debugging, Software Consultation, Agile Software Development, Desktop Application, Software Testing, Standalone Application, CodeIgniter, Apache Hive, Jakarta Server Faces, Hybris, Cloud Computing, Java, Ruby on rails, Back-End Development Framework, Front-End Development Framework 🚀 Click “Invite” if you need a Full Stack Developer React Node, Full Stack AI SaaS Developer, or Node.js Developer.