I build SaaS platforms that scale - from zero to enterprise-ready, with a proven track record. Architecture, payments, real-time features, AI integrations, security audits - I own the full stack without hand-holding. I've taken products through the full lifecycle: architecting the MVP, scaling for rapid growth, and passing security audits including CASA Tier 3 - Google's highest-tier cloud application security assessment, reserved for applications handling sensitive user data. CORE STACK & AREAS OF EXPERTISE • FRONTEND: Expert-level React / Next.js (TypeScript). Deep experience building accessible (ADA/WCAG compliant) and high-performance UIs. • BACKEND: Scalable APIs, real-time services (websockets/streaming) and distributed job queues using Node.js (TypeScript) / Bun / Deno. I also leverage Rust and Go for performance critical services. • AI & AGENTIC FEATURES: Integrating LLM-powered features and building agentic workflows into applications. Recent experience adding agentic capabilities to a SaaS product. • DATABASES: Strong preference for PostgreSQL (self & cloud-managed, Supabase & PlanetScale) for its extensibility (PostGIS, pgvector for AI/RAG, timescale, etc.). Type-safe data modeling (Prisma, Drizzle or Kysely). Redis for caching, distributed locking, Pub/Sub, rate limiting. • PAYMENTS & BILLING: I've built reliable revenue pipelines using Stripe (Subscriptions, Connect, Webhooks & other features in the Stripe ecosystem) • DEVOPS & CLOUD: I build automated CI/CD pipelines (GitHub Actions) for testing & deploying to AWS, GCP, Azure, Vercel and other PaaS. • DESKTOP: I use Tauri for lightweight, cross-platform desktop applications (and Electron for broader compatibility). • TESTING & QA: E2E testing using Playwright, Appium for mobile (iOS/Android), and Vitest/Jest for unit/integration tests. React Testing Library and Storybook for further testing / component-driven development. ================================== TEAMWORK / COMMUNICATION • FOUNDER MINDSET: In my experience, being able to explain the 'why' behind technical choices so leadership can make informed decisions is crucial. This has naturally made me very comfortable communicating with stakeholders. • AGILE & SDLC: Familiar with Agile/Scrum events and using development tools to manage sprints and documentation. • ASYNC COMMUNICATION: I understand and value the importance of proactive communication, thorough PR reviews and documentation. ================================== APPLICATION SECURITY & COMPLIANCE • CASA TIER 3: Proven track record of meeting the highest security standards for SaaS applications, including passing Google’s Cloud Application Security Assessment Tier 3. • APPLICATION SECURITY: I follow OWASP best practices to protect against vulnerabilities. Securely handling of OAuth2/OpenID Connect flows for social login (Google/Microsoft/etc. OAuth), for stateless and stateful authentication. • COMPLIANCE: I build with ADA/WCAG and security frameworks in mind, ensuring that your application is ready for enterprise-level audits from day one. • DATA PROTECTION: Proper handling of application secrets (Vault, AWS Secret Manager, Infisical, etc.), built role-based access control (RBAC) systems. I also ensure data is encrypted at rest & in transit, and use of advanced cryptography for storing highly sensitive data. ================================== INFRASTRUCTURE & NETWORKING • Linux Server Administration (AWS EC2, GCP, Azure & other VPS providers), IaC, virtualization (Proxmox, ESXi), containerization (Docker/LXC) - using compose and swarm for deployments. • DNS / DOMAIN MANAGEMENT: Deep experience understanding of how DNS/HTTP(s) works, including subdomain routing, SSL certificates, and global traffic distribution (Cloudflare, Route53). • EMAIL INFRASTRUCTURE & DELIVERABILITY: Expert at configuring SPF, DKIM, and DMARC records to ensure 100% email deliverability. I’ve managed migrations and setups for Google Workspace, Microsoft 365, and providers (SendGrid, Resend, Amazon SES and more). ================================== If you need a developer and/or partner who understands the "why" behind the "how" - let’s talk! ------ A little more about me: Working in tech is my dream job. I genuinely enjoy what I do, and I love learning and keeping up with new tech. What all started as a small "home lab" in my room, has turned into building mind blowingly complex software and I'm extremely grateful for this journey. When I’m not at my desk, you’ll find me on long-distance cycling trips - sometimes I wish there were more hours in the day!

⚡ “Jarmo was an absolute unit.” That’s what one of my long-term clients said about me — and I wear that badge with pride: “He took immense initiative, added great touches, delivered a bug-free product, and made handover a breeze. We’ll 100% work with him again.” – Vaibhav Namburi, Founder of Smartwriter.ai, Smartlead.ai, five2one I don’t do free test tasks or week-long hiring funnels. With over 8 years of experience in full-stack and AI engineering, I specialize in helping ambitious startups and scaling teams build clean, production-ready solutions — from MVP to scaling infrastructure — with speed, precision, and reliability. ✅ What I bring to the table: - AI-first Development: Experience implementing RAG (Retrieval-Augmented Generation) pipelines for AI agents and knowledge assistants using Embeddings, Vector Stores (Pinecone, Weaviate, Supabase), and LLMs (OpenAI, Claude, Mistral, Gemini). - Hands-on with fine-tuning LLMs (OpenAI function calling, LoRA adapters, quantization) and prompt-engineering for real-world applications (support agents, content automation, internal tools). - Used LangChain, LlamaIndex, Haystack, and OpenRouter to ship AI-native apps fast. - Integrated LLM caching layers, observability (Langfuse), and streaming outputs with full frontend/backend support. Frontend Expertise: - SvelteKit / Vue / Nuxt for fast, lightweight UI - TailwindCSS, SCSS, PWA setup - Experience in headless CMS setups with Strapi, Contentful, Medusa – ideal for marketing sites or eCommerce Backend + APIs: - Golang, Node.js (Nest.js & Express.js), Deno, - PostgreSQL, Redis, MongoDB - Firebase/Supabase for serverless use cases - Built and maintained robust REST/GraphQL APIs Integrated with 3rd party APIs: Stripe, Twilio, Gmail, Search Console, OpenAI, Facebook, IPInfo, Mapbox Cloud & DevOps: - GCP (Google Cloud), DigitalOcean (agency partner), Cloudflare - CI/CD with GitHub Actions, Vercel, Netlify, Heroku - Dockerized setups and container orchestration on Ubuntu/Linux Leadership & Collaboration: - Led teams of 8+ engineers across timezone-diverse teams in the EU, US, and Australia - Strong async communication using Loom, Linear, Slack, and Notion - Collaborative with product managers and designers; happy to hop on calls, or build in silence — whatever works best 🧠 Bonus Skills: - LLM/RAG Playground Dev: Built internal tooling for iterating on prompts and retrievers for RAG pipelines. - Vector Search: Setup Supabase & Weaviate-backed vector databases from scratch, used with cosine similarity, hybrid ranking, metadata filtering, and chunking strategies. - AI Infra: Familiar with huggingface transformers, ONNX conversion, quantized models, and deploying optimized endpoints. - Realtime systems: Websockets, server-sent events (SSE), background workers using Golang or Node. If you're looking to work with a developer who can do more than just "code features" — someone who can: - Architect your AI stack, - Set up your infra and deploy your app, - Build a scalable, maintainable product from scratch, - Or take your MVP to v1 with confidence — 👉 Let’s talk. I build fast, communicate clearly, and aim for long-term collaboration.

As a senior-level full-stack developer, I bring a comprehensive expertise that encompasses end-to-end website development, robust database architecture, cutting-edge API development, and advanced server-side programming. I'm passionate about delivering high-quality solutions that meet clients' needs and exceed their expectations. With a strong background in both Front-end and Back-end Development, I am well-equipped to handle end-to-end project requirements. My Tech stack: ▪️Back-End: Node.js, Typescript and Nest.js ▪️Front-End: Angular / React (Redux, Saga, NGRX) / HTML5/CSS3 + Twitter Bootstrap 3/4, Next.js ▪️Data visualization (Highcharts, Chart.js, D3.js etc.) ▪️DB: Neo4J / QuestDB / MySQL / PostgreSQL / MongoDB programming ▪️REST API development/integrations: Stripe, Google, Facebook, Salesforce etc. ▪️Amazon Web Services: EC2, S3, RDS, CloudSearch etc. If you are in search of an individual Full Stack developer with a knack for seamless integration into your existing team dynamics and contributing high-quality, scalable solutions, I invite you to get in touch.

As an ex-FAANG software engineer with ~15 years of industry experience, I've honed my skills across a diverse range of projects, including marketing websites, applications for digital agencies, internal and external tools at Facebook, civic technology initiatives, and SaaS products. I'm passionate about open source, developer experience, clean code, and maintainable software. My expertise includes technologies such as ES6, TypeScript, PHP, HackLang, Python, HTML5, CSS3, GraphQL, REST, Redux, React, and React Native. I have a proven track record of delivering high-quality, scalable, and secure solutions that meet and exceed client expectations. I am also an active contributor to the open-source community and have experience speaking at events like TEDxAlbaIulia and Techsoup webinars. As a freelancer on Upwork, my goal is to apply my extensive knowledge and skills to help you achieve your project goals and ensure your complete satisfaction. Let's discuss how I can bring value to your project and create a successful partnership together!

Leading the team that created the fastest .NET decompiler - JustDecompile, the ReactNative competitor - NativeScript, and the world famous debugging proxy Fiddler Everywhere. We have built dozens of cloud native, distributed apps in AWS and Azure. Our work is used by millions worldwide on daily basis. We never leave a job unfinished and e always deliver more than expected.

I help businesses design, launch and scale high-performance web applications including AI-powered SaaS platforms and real-time dashboards using Next.js, TypeScript, Node.js, Supabase and modern AI APIs such as OpenAI and Claude. My work focuses on production-ready architecture, scalability and long-term maintainability ensuring applications remain reliable as products grow and user demand increases. 🤖 AI Engineering Experience - Integration of OpenAI and Claude APIs into production SaaS platforms - AI-powered workflows, assistants and automation systems - Streaming AI responses and real-time user interfaces - Context-aware applications using vector databases and structured data - Token optimisation and scalable AI architecture design 🛠️ Core Expertise Frontend: Next.js (App Router, Server Components), React, Vue 2 & Vue 3 (Options API, Composition API), Tailwind CSS, TypeScript Backend: Node.js (Fastify/Express), Ruby on Rails, Python (Django, FastAPI), Deno (edge-ready), Laravel Databases: Supabase, PostgreSQL, MongoDB, Redis, Firebase AI/LLM Integration: OpenAI, LangChain, Claude, Vercel AI SDK API Development: REST, tRPC, GraphQL, WebSockets, Stripe DevOps & Infrastructure: Vercel, AWS (Lambda, S3), Cloudflare Workers, Docker, GitHub Actions ⚙️ Solutions I Deliver - AI-enabled SaaS platforms and intelligent automation systems - Real-time applications using WebSockets and streaming architectures - Scalable backend services and API ecosystems - Serverless and edge deployments focused on performance and cost efficiency - Dashboard and internal tooling development for operational workflows ✅ Why Clients Choose Me - Clean, modular and scalable engineering practices - Clear communication and reliable delivery - Proactive problem-solving with ownership mindset - Product-focused approach aligned with business goals - Experience working across both new builds and existing codebases I focus on building reliable, scalable products designed for long-term growth and sustainable development.

Most businesses are sitting on dozens of repetitive tasks that quietly drain time every single day. The emails that need manual replies. The content that has to be written, approved, and posted by hand. The messages that need cleaning before they go out. These are not strategic problems. They are workflow problems. And workflow problems have workflow solutions. I build automation systems in n8n that handle these tasks end to end, without human intervention, unless you specifically want it. Here is what that looks like in practice: I built an n8n workflow that connects to Perplexity for live topic research, injects the findings into an AI model, generates a LinkedIn post from that output, routes it through a human approval step, and then publishes it directly to the LinkedIn profile once approved. The content team went from spending hours per post to reviewing a draft in under two minutes. I built an automated email responder for a sales inbox that reads the incoming message, pulls the full conversation history, checks the company knowledge base, and generates a context-aware reply. No templates. No guesswork. Responses that actually reflect the business. I built a Slack-integrated workflow where team members send a rough message and receive a professionally rewritten version back in seconds, adjusted for the tone they specify. Spelling cleaned. Grammar fixed. Personalization intact. If you are looking for someone to drag nodes around and call it automation, I am not the right fit. If you want a workflow that runs reliably in production, handles edge cases, and connects your real tools to real outcomes, let's talk. What I work with: n8n, OpenAI API, Claude API, Perplexity API, Slack, Gmail, LinkedIn API, Airtable, Google Sheets, REST APIs, Webhooks, Make (Zapier alternative experience), JavaScript, Python (for custom nodes) Who I work with: Startups and founders who want to stop doing things manually. Mid-size teams who need their tools to actually talk to each other. Agencies who want to white-label automation delivery for their clients. Engagement types: Fixed-scope builds. Long-term retainers for workflow maintenance and expansion. Staff augmentation for teams that need a dedicated automation engineer.

🚀 Skilled full stack web developer with expertise to transform concepts into digital realities. with a comprehensive skill set, adept problem-solving abilities, and a proven track record of delivering exceptional web solutions, I am the expert you can rely on Why Choose Me: I have a wide range of experience working with various technologies, including the MEVN stack, MERN stack, ReactJS, Vue.js, Node.js, and more. I also have experience working with cloud infrastructures such as AWS, and have deployed scalable applications using tools like Docker. In addition to my technical skills, I am a problem-solver at heart and enjoy finding creative solutions to complex challenges. I am self-motivated and driven to continually improve both as a developer and as a member of the development community. My main areas of expertise include: - Front-end: HTML, CSS/SCSS, JavaScript, TypeScript, React.js, Vue.js, Next.js, Nuxt.js, Svelte, SvelteKit, GSAP Animation -CSS Frameworks: Tailwind CSS, Vuetify, Shadcn, NextUi, Vuestic, Bootstrap - Back-end: Node.js, Go (Golang), Express, Fiber - Backend-as-a-Service (BaaS): Firebase, Supabase, Appwrite, PocketBase, - Serverless Computing: AWS Lambda, Cloudflare Worker, Deno Edge Function - Cloud Services: Amazon Web Services (AWS) I am particularly interested in mobile development and machine learning, and am always seeking out new opportunities to learn and grow as a developer. Thank you for considering me for your project. I look forward to the opportunity to work with you and bring your vision to life. I am constantly learning and staying up-to-date with the latest technologies and best practices in web development. I am excited to bring my skills and expertise to a new project and contribute to the success of the team. 💪 Ultimately, my goal is to become a trusted and valued member of any team I work with, and to make a positive impact on the projects and organizations I am a part of.

🏆 Top Rated · Top 10% · 100% Job Success Score 🌐 Forbes Technology Council Member 🌍 Dubai & Singapore · Serving US, UK & Gulf clients I build products that ship, scale, and make money. 10+ years across AI, blockchain, full-stack development, and product design. I've taken projects from whiteboard to production across healthcare, real estate, fintech, Web3, and hospitality. Live products with real users. What I've shipped: 🤖 Confirmlyai - AI voice and chat booking platform, 33 clinics across UAE, no-shows down 21% last month 🏠 Hutfin - real estate marketplace, YCombinator selected, $5M pre-seed raised 🎮 VAF Gaming - NFT marketplace, $1.3M revenue in 72 hours 🍜 iMakan - multi location SaaS, 12 facilities Singapore, expanding Dubai 📈 GMX IO - autonomous AI trading platform, $350B total volume and 460k+ active traders 🏥 Carepatron alike Definia healthcare platform, 60 US facilities, HIPAA and SOC2 compliant What I build for clients: → AI agents and automation; n8n, Make, Claude API, OpenAI, voice agents, RAG pipelines → Full stack SaaS; React, Next.js, Node.js, PostgreSQL, Supabase → Blockchain and Web3; smart contracts, NFT marketplaces, tokenomics, DeFi, liquidity strategy, TGE → Product design; conversion funnels, landing pages, SaaS UI, mobile apps I work as a fractional CTO, lead developer, and product partner. Share your goal and deadline. I'll come back with the fastest honest path to results. Skills: Full-Stack Development, React, Next.js, Node.js, Python, PostgreSQL, Supabase, AI Integration, Claude Code, Claude Design, Anthropic APIs, OpenAI, n8n, Make, LangChain, RAG, Voice AI (Retell, Synthflow, Elevenlabs, WAPI), Blockchain, Smart Contracts, Solidity, NFT, Web3, Flutter, Mobile App Development, SaaS, API Integration, UI/UX Design, Figma

Need a senior architect who can build it, scale it, and make it beautiful, with AI woven through the whole thing instead of bolted on the side? That's what I do. I'm a principal full-stack architect and polyglot engineer, 15+ years taking products from idea to production across fintech, health-tech, cybersecurity, blockchain, defense, and AI. $500K+ earned, 6,000+ hours, 5.0 rating. I run Claude Code as my daily execution layer, which is how I ship in weeks what used to take quarters, without the quality dropping. 💡 Work clients know me for: - A $500M real-time fintech trading platform (web + mobile) - A $100M real estate CRM built from scratch; the firm was acquired by Cushman & Wakefield - Solana indexing infrastructure handling $1–3T in daily transaction volume - A live algorithmic quant trading platform running real money on a tier-1 broker - Federated-learning threat detection for an AI cybersecurity platform - Solo-replaced a 10-developer offshore team on a national assistive-communication app 🤖 AI / LLM, where much of my recent work lives: - Production LLM systems with structured outputs, guardrails, and audit logging in regulated fintech - Multi-model pipelines (Claude, Whisper, Gemini, OpenAI, ElevenLabs) chosen deliberately for cost, latency, and accuracy - MCP and agentic tooling, with official Anthropic certifications behind it - A production AI agent and grounded voice-and-chat assistant on frontier models (Gemini, Claude, GPT), with real tool-calling into live equipment data, RAG over the actual manuals, a scorer, and an adversarial grounding eval harness that gates every deploy so it cannot hallucinate to users - Architecting specialized-model training on proprietary field data: fine-tuning small open models (Llama/Qwen) for domain tasks like fault diagnosis and failure prediction, with labeled eval sets and an eval-gated deploy pipeline - The discipline that keeps AI output reliable and affordable in production, not just impressive in a demo 🛠 Stack: - Full-stack: TypeScript/React/Next.js, Node/Deno, Python, Go, Rust, Ruby/Rails, PHP/Laravel - Mobile: Flutter, React Native, Swift, Kotlin - APIs & data: GraphQL, REST, PostgreSQL, MySQL, MongoDB, Redis - Cloud & infra: AWS, GCP, Supabase, Docker/K8s, CI/CD - AI: Claude, Gemini, GPT, MCP, multi-model orchestration - Security: PCI DSS remediation, federated learning, RLS/RBAC, signed webhooks 🎯 Clients hire me when: - They're launching something ambitious and want it architected right the first time - Their legacy codebase is a mess and they need someone who can inherit it and stabilize it fast - They want AI built into the product correctly, by someone who's shipped it in production - They want someone who thinks like an engineer, a strategist, and a founder I also direct and design large-scale sculptures and immersive environments. Fluent in product vision, UX/UI, and creative direction, with experience in Rhino3D, Unity, CAD, TouchDesigner, and Adobe. Request my design portfolio directly if you're curious. 📩 Message me and tell me what you're building. I'll tell you how I'd make it better.