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I am a passionate Full Stack Developer with over 10 years of experience in creation of robust software to solve real-world problems. Drop me a message and let’s schedule a call to discuss your project 🚀 𝗪𝗵𝗮𝘁 𝘀𝗲𝘁𝘀 𝗺𝗲 𝗮𝗽𝗮𝗿𝘁 ▪ Optimized workflow for speed and efficiency: Over the years, I've honed my workflow to maximize productivity. I use Neovim, the fastest code editor, and thoroughly test critical components to prevent future issues. This enables me to produce a high volume of quality code swiftly. ▪ I communicate well to make sure all possible scenarios and use cases are clarified. ▪ Problem-solving mindset: I can translate real, complex problems into technical specifications and derive clear implementation steps from them. ▪ I design maintainable and scalable environments, architectures, frameworks, and APIs that other developers enjoy working with. ▪ I’ve seen a lot: I’ve spent days trying to figure out why my triangle isn’t rendering in Vulkan, why the neural networks I’ve implemented aren’t getting smarter, or why my TLS certificates aren’t being recognized. Every time, I come to a solution and learn from it. Thanks to my diverse experiences, I excel at debugging. ▪ Entrepreneurial thinking: Development alone is undoubtedly enjoyable. However, it’s an incomparable feeling when I use it to solve real people’s problems. 𝗪𝗵𝗮𝘁 𝗜 𝗰𝗿𝗲𝗮𝘁𝗲 ▪ Performant and efficient backends & Rest APIs ▪ Astonishing frontends ▪ Infrastructures ▪ SaaS 𝗠𝘆 𝘁𝗲𝗰𝗵 𝘀𝘁𝗮𝗰𝗸 Golang, Rust, Node.js, PHP, GraphQL | PostgreSQL, MySQL | React, TypeScript, JavaScript, Tailwind | Terraform, Docker, Kubernetes | Google Cloud Platform, Azure | WordPress 𝗪𝗵𝗮𝘁 𝗺𝘆 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝘀𝗮𝘆 ⭐⭐⭐⭐⭐ "Eugen delivered exceptional results in conversion of my prototype into a production-ready version and eventually launching." ⭐⭐⭐⭐⭐ "Eugen demonstrated not only exceptional technical skills but also a deep understanding of my requirements and a commitment to delivering a product that exceeded my expectations." ⭐⭐⭐⭐⭐ "Eugen has been an exceptional professional to work with. His expertise, dedication, and attention to detail have significantly contributed to the success of our project. He consistently delivered high-quality work on time and communicated effectively throughout the entire process." Drop me a message and let’s schedule a call to discuss your project 🚀

Full Stack Developer and AI Engineer - CEO and Co-Founder of Invirial, 𝐚 𝐬𝐞𝐧𝐢𝐨𝐫 𝐭𝐞𝐚𝐦 𝐨𝐟 𝟗+ shipping B2B SaaS and Fintech products. Track record: Member since 𝟐𝟎𝟏𝟐 · 𝟏𝟎𝟎% JSS · $𝟔𝟎𝟎𝐊+ earned on this profile · $𝟒𝐌+ earned across our agency. To be clear upfront: I don’t write the code myself on every project. As Co-Founder, I scope, architect, and oversee delivery — my Full Stack Developers and AI Engineers ship. That’s why clients hire us instead of a solo freelancer: real capacity, senior oversight, and no single point of failure. 𝐖𝐡𝐚𝐭 𝐰𝐞 𝐛𝐮𝐢𝐥𝐝 Most clients come to us with one of two problems: they need a product built properly from scratch — an MVP that ships in weeks, not quarters — or they have an existing system that needs a senior Full Stack Developer or AI Engineer team to take ownership and move it forward without hand-holding. We’re a Full Stack Developer and AI Engineer team in one shop. That matters in 2026 because the line between the two has collapsed: modern SaaS products need React and Next.js on the frontend, Node and Python on the backend, and LangChain, RAG pipelines, and OpenAI or Claude integration as core features — not as a bolt-on. We own the whole stack end-to-end so you don’t have to coordinate three vendors. Our Full Stack Developers ship in: React, Next.js, Node.js, TypeScript, JavaScript, Python, Django, FastAPI, MongoDB, PostgreSQL, Supabase, Tailwind CSS, shadcn/ui, Stripe, AWS, Docker, REST APIs, third-party API integration. MERN stack and Next.js + Supabase + Stripe are our two default builds for SaaS MVPs. Our AI Engineers ship in: Python, LangChain, LangGraph, OpenAI API (GPT-4o, GPT-5), Claude / Anthropic API, RAG pipelines, vector databases (Pinecone, Chroma, FAISS, Weaviate), LlamaIndex, FastAPI, Hugging Face, fine-tuning (LoRA/QLoRA), n8n, Make. com, AWS Bedrock, Azure OpenAI, prompt engineering, AI agent development, chatbot development, and voice stack (Vapi, ElevenLabs, Twilio). We don’t do prompt-only ChatGPT wrappers. Our AI Engineers ship real agentic workflows — multi-step reasoning, tool calling, memory, guardrails, and production deployment. 𝐖𝐡𝐚𝐭 𝐰𝐞 𝐝𝐞𝐥𝐢𝐯𝐞𝐫 Whether you need a React developer for a SaaS dashboard, a MERN stack developer for a full product build, an AI agent developer for a multi-agent system, a generative AI engineer for a RAG chatbot, or a Next.js developer to migrate from WordPress or Bubble — we have the right senior on the team for it. Common deliverables: B2B SaaS MVPs from scratch, Fintech platforms with Stripe and compliance-aware architecture, RAG chatbots and knowledge-base assistants, AI automation with n8n + Claude, AI voice agents, admin dashboards with auth and RBAC, no-code-to-code migrations (Bubble/Lovable/Framer → coded stack), and ongoing engineering for products in growth. Recent Full Stack Developer and AI Engineer projects A snapshot of the project archetypes our team ships most often: 🔘 Fintech SaaS platforms — Next.js + Supabase + Stripe builds with subscription billing, KYC flows, role-based access, and compliance-aware architecture. Senior Full Stack Developer–led. 🔘 RAG chatbots and knowledge-base assistants — production-grade retrieval pipelines built by our AI Engineers using LangChain, Pinecone, and OpenAI or Claude, with guardrails, source citations, and LangSmith evaluation in place from day one. 🔘 AI agent and agentic workflow systems — multi-agent architectures using LangGraph, OpenAI Agents SDK, or n8n + Claude for lead generation, CRM enrichment, and internal operations automation. Built by AI Engineers who’ve shipped agents in production, not just demos. 🔘 B2B SaaS MVPs from scratch — full-cycle Full Stack Developer builds covering product architecture, React/Next.js frontend, Node or FastAPI backend, payment integration, and AWS or Vercel deployment. Designed for clients who need to launch fast and scale without a rebuild. 🔘 AI-augmented Full Stack rebuilds — taking an existing B2B SaaS or Fintech product and adding LLM-powered features (chat with your data, AI copilots, smart automation) through our combined Full Stack Developer + AI Engineer workflow. The hybrid build is what we do best. Why clients pick our Full Stack Developer and AI Engineer team over a solo freelancer A senior team of 9+ means we ship faster than a solo Full Stack Developer or AI Engineer and survive bus factor. CEO and Co-Founder oversight on every project means architecture decisions get made by someone with 14+ years of shipped products behind them — not by whoever happens to be assigned to your account. And because we work as a single agency rather than a marketplace of strangers, the engineer reviewing your code on Friday is the same one fixing the bug on Monday. If you’re building a B2B SaaS or Fintech platform and need a senior team that ships, let’s talk.

Software Architect and Full-Stack Engineer. I design and implement full-stack systems from scratch, with a focus on React for web and Flutter/React Native for cross-platform mobile environments. I work at the intersection of frontend state management and backend data modeling. My focus is entirely on performance, system boundaries, and predictable data flow. I do not work on content sites, marketing pages, or low-code platforms. If you have a complex system to map out, an existing codebase with broken state replication, or need a clean architecture established before your team starts writing code, send over an invite with a brief overview of your technical stack.

Mobile App Developer specializing in React Native & Flutter. I help startups build cross-platform iOS & Android apps – from validated MVP to App Store launch. Backed by a 330+ engineer full-cycle team with 20+ years of experience, I deliver mobile applications that go beyond clean UI – covering backend API, cloud infrastructure, QA, and AI integration in a single engagement. Whether you're a founder validating your first mobile idea or a product team scaling an existing app, I focus on one goal: shipping a product that users download, use, and come back to. 💡 Case Studies 🧠 BibleLytics (Wellness & AI, Startup) – Built a full AI-powered mobile MVP from discovery phase to App Store launch. The app guides users to Bible verses based on emotional state using vector search across 400+ mapped emotions and OpenAI GPT-powered prayer generation. Delivered cross-platform iOS + Android from a single Flutter codebase, plus a web admin dashboard and landing page. Stack: Flutter · GCP · OpenAI GPT · Vector Search · JavaScript Result: Budget-efficient cross-platform delivery · validated concept before development investment · scalable architecture ready for multi-version expansion. ⚖️ Legal Beagle (LegalTech SaaS, USA) – Developed a white-label legal services platform with a 12-person team. The Android app enables real-time attorney-client collaboration: video consultations, secure messaging, e-signing, and full case management on mobile. Integrated CRM and legal document tools (Clio, DocuSign) with seamless cross-platform delivery across Android, iOS, and web. Stack: Kotlin · Android SDK · Swift · React Native · TypeScript · PHP 8 (Symfony) · AWS ECS Fargate · Firebase · Docker · CircleCI Result: Scalable white-label LegalTech SaaS · enterprise-grade security & data protection · consistent UX across all platforms and device types. 📡 Boarding Path (Smart Navigation, iOS) – Led the discovery phase for a native iOS indoor navigation platform. Conducted technical feasibility analysis, vendor evaluation (IndoorAtlas, beacons), UX design for complex indoor environments, and full documentation to launch development with zero guesswork. Stack: Swift · Native iOS · Python · Django · IndoorAtlas · AWS · PostgreSQL Result: Concept validated before a dollar was spent on development · technical risks eliminated upfront · market-ready iOS roadmap with full vendor alignment. 🏅 North Jersey Vipers (Sports, USA) – Built a cross-platform mobile app for a US sports club – enabling content sharing, team updates, and secure media storage for players, coaches, and parents. Delivered iOS + Android from a single React Native codebase within a tight budget and timeline. Stack: React Native · JavaScript · Nest.js · Node.js · AWS Result: Cost-optimized cross-platform delivery · secure content storage · minimized long-term maintenance overhead. 📱 Platforms & Frameworks React Native · Flutter · Expo Native iOS: Swift · SwiftUI · Objective-C Native Android: Kotlin · Java Progressive Web Apps (PWA) 🌐 Backend & APIs Node.js · Nest.js · PHP · Symfony · Python · Django REST APIs · GraphQL · WebSockets · Firebase Realtime Database ☁️ Cloud & Infrastructure AWS (ECS Fargate, Lambda, S3, RDS, CloudFront) GCP · Azure · Docker · Kubernetes CI/CD: Bitrise · CircleCI · GitHub Actions 🤖 AI Integration OpenAI GPT · Vector Search · AI-powered mobile features LLM-based content personalization · Intelligent recommendations AI chatbot integration for mobile apps 🔗 Mobile Integrations Stripe · Clio · DocuSign · IndoorAtlas Firebase Push Notifications · WebRTC (video consultations) App Store & Google Play – full submission and launch support 🔐 Security & Compliance HIPAA-aware mobile development · GDPR-compliant data handling Secure messaging · E-signing · Enterprise-grade authentication Biometric auth · End-to-end encryption Why teams choose us: ✅ Full platform coverage – React Native, Flutter, Native iOS (Swift) & Native Android (Kotlin) from one team, no handoffs ✅ 330+ engineers – backend, DevOps, QA, and UI/UX always available alongside mobile development, so you never hit a skills gap ✅ 2,250+ delivered projects across HealthTech, LegalTech, FoodTech, Sports, Wellness, and B2B SaaS ✅ Full-cycle delivery – from discovery and UX design to backend API, cloud infrastructure, and App Store submission ✅ AI-ready from day one – we integrate OpenAI, vector search, and intelligent features into mobile apps without slowing the timeline Send me a message – tell me about your app idea, and I'll respond within a few hours with a clear plan and honest timeline estimate.

I help founders and non-technical companies turn software ideas into real products, technical teams, and scalable engineering foundations. That means more than writing code. I can help define what should be built, how it should be built, who should build it, and what process is needed to get the first real product out. I’m a Senior Full-Stack Developer, Software Architect, and hands-on technical leader from Germany with 15+ years of experience building SaaS platforms, custom CMS solutions, internal tools, dashboards, onboarding flows, integrations, and complete product foundations. Core stack: TypeScript, React, Next.js, Node.js, PostgreSQL/MySQL, GraphQL, AWS, Vercel, Supabase, Docker, CI/CD, and modern AI-assisted development tools. Most software projects do not fail because nobody can write code. They fail because the wrong foundation is built: unclear product direction, fragile architecture, bad hiring, weak processes, messy business logic, poor UX, underestimated integrations, or AI-generated code nobody can maintain. When to Involve Me I am most valuable before major product, team, and technical decisions are locked in. For non-technical founders or companies, one common mistake is hiring a project manager, designer, or developer before understanding what the product actually needs. A PM, designer, or developer can all be useful — but only when the technical foundation, product scope, architecture, and collaboration model are clear. I help you decide: - what should be built first - what can wait - what architecture makes sense - what team roles are actually needed - whether AI-assisted design is enough for the first phase - how to organize development without unnecessary overhead - where AI can save time without creating technical debt What I Can Help With - Building a technical/product department from scratch - Hiring and screening developers, designers, and technical roles - Setting up development processes, code quality standards, CI/CD, and project workflows - SaaS MVPs and production-ready web applications - Custom CMS platforms and content management workflows - Admin panels, dashboards, and internal business tools - Multi-step onboarding forms and complex user flows - CRM, payment, email, analytics, monitoring, and third-party API integrations - Business process automation and workflow software - Next.js/Vercel apps, Supabase-backed MVPs, serverless APIs, and startup infrastructure - AI-assisted product features and AI workflow integration - Technical rescue of unstable or hard-to-maintain applications What You Get - Product and technical leadership, not just ticket execution - Stable architecture that can grow with your product - Clean TypeScript, React, Next.js, and Node.js code future developers can maintain - UX-focused implementation that feels intuitive, reliable, calm, and effortless to use - Complex business logic translated into clear workflows, data models, and maintainable systems - DevOps, CI/CD, deployments, monitoring, analytics, SEO basics, and code-quality automation where needed - AI-assisted visual support for logo concepts, website design direction, UI ideas, copy, SEO, and polished product presentation when useful How I Work With AI I use AI heavily, but as a professional engineering tool — not as a replacement for engineering judgment. AI helps me move faster, explore options, generate boilerplate, improve UI concepts, write tests, and reduce repetitive work. But architecture, UX decisions, code quality, and final implementation stay under my control. I use custom workflows, coding standards, architecture rules, review processes, and multiple refinement passes so the final result stays maintainable and feels like software I would have written myself. Highlights - Built and led the entire tech/product department for a social impact platform in Germany, including hiring, product direction, processes, architecture, infrastructure, and core implementation - Built a complete SMS marketing platform as co-founder and lead engineer, including a custom ORM and automated pipeline from database schema to frontend SDK - Built custom rich text editors and CMS-like systems used by thousands of users - Delivered projects across travel, e-commerce, healthcare, government, social impact, workflow automation, and startup SaaS - Led developers, mentored teams, screened candidates, and introduced better engineering processes Who I Work Best With - You are a founder or non-technical company that needs technical/product leadership - You need help turning a business idea into a real product and technical foundation - You care about quality, UX, maintainability, and long-term scalability - You have workflows, integrations, dashboards, onboarding flows, or business logic that need thoughtful planning - You want AI-assisted speed, but not AI-generated technical debt If you need a hands-on technical partner who can help plan, build, hire, organize, and launch. Thats me.

I build web products that ship on time, scale cleanly, and keep working after launch. 11+ years in IT, 8+ in web development, most of it as a senior engineer and tech lead owning architecture, code, and features end-to-end. What that has looked like: • Co-founded and led engineering on an excursion discovery platform, scaling it past 2,000 monthly active users • Built a B2B operations platform from zero to 20+ active companies on a microservice architecture • Architected and delivered an AI-powered event management app, including the CI/CD and cloud infrastructure behind it • Led cross-functional teams and mentored engineers, raising delivery speed without sacrificing quality Core stack: TypeScript, Node, NestJS, Express, React, Next.js, Vue, PostgreSQL, MongoDB, GraphQL, Microservices, Docker, System design, TDD. How I work: I dig into the actual problem before writing code, tell you plainly when a simpler path exists, and keep you informed without needing to be chased. I pick up unfamiliar tools and domains fast, which means you don't pay for a long ramp-up. Whether you need a greenfield build, a rescue on a stalled codebase, or a senior hand on an existing team, I move the project forward from week one. Tell me what you're building.