Len K.

I help founders, operators, and growing teams turn product ideas into full-stack web apps, MVPs, SaaS platforms, CRMs, and AI systems that fit their goals, budget, and timeline. I've scaled web apps to 300k users, built $10M/yr revenue engines, and have helped pre-revenue startups grow to over $1B valuations. Combining hands-on full-stack development with product leadership, I design, build, and ship robust platforms that drive real traction and revenue. For the past 6 years, I’ve primarily worked with Next.js, React, and Node, backed by over 10 years of prior web development experience. Today, my go to stack for MVPs is Next.js + Supabase + Vercel. 👉 Portfolio: lk-dev (dot) com 🚀 What I build • Full-stack web applications • Next.js development • MVP development from idea to launch • Custom CRM solutions • Multi-tenant SaaS architecture • API integrations and endpoints • AI agents, systems and integrations • AI automations that remove repetitive work • Product and roadmap planning 🧭 How I work My mindset focuses on a clean and scalable architecture, useful features and no unnecessary complexity. Before development begins, I help define what should be built, what can wait, and what fits the budget and timeframe. You will receive practical product input, clear scope, and a build plan. During engineering, I write clean, fully tested code built to scale. I handle complete documentation and guide you through a smooth handoff so you have full control over a polished product and infrastructure. Most importantly, you own 100% of the code and repository at all times. ⚙️ Best fit projects • You have a product idea and need a technical partner • You need a full-stack developer for a web app or SaaS platform • You want to automate repetitive business processes with AI • You need AI agents or integrations added to an existing workflow • You’re building an MVP and want to launch the right first version • You need a CRM or business application developed 🤖 AI Development I was building websites for two decades before Claude. Now, AI has equipped me with superpowers. I am part of the Claude Partner Network and am a Claude Certified Developer (CCDV-F) from Anthropic. I can build AI-powered workflows, agents, integrations, and MCP servers tailored to your business processes. I can eliminate manual bottlenecks and save your team countless hours. 🤝 What you can expect • Honest scoping • Clear communication • Practical product decisions • Reliable engineering • A focus on outcomes, not busywork 🏆 Shipped Highlights • ReferIntel .com - Multi-vendor SaaS for managing referral networks for Orthodontists and other medical specialties. • Dusted .io - Online community and social network for product marketers to prove their craft. • FollowUpOnly .com - CRM for sales agents that systematizes follow ups. • BringRx .com - Multi-tenant SaaS that enables 1-Click launch of Telehealth clinics for GLP1/Peptide treatments. If you’re building a web app, MVP, SaaS, CRM, or an AI-integrated product, send me the details, timeline, and budget. I’ll help you identify the most practical path forward.