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.