Hans Fjällemark

From idea
to shipped

I build full products across web, mobile, and AI. Turning concepts into production software, ready for real customers.

Let's talk
Hans FjällemarkHans Fjällemark

My Philosophy

Good products start with understanding the problem, not jumping to code. I focus on getting the fundamentals right: clear architecture, honest communication, and building only what matters. I stick around as long as you need me, but the goal is always to leave you independent. Every codebase I ship is built to work well with coding agents, so your team can maintain and iterate on it, even without deep technical expertise.

My Stack

The best stack is the one that gets out of the way. I lean heavily on battle-tested tools that handle the boring parts, so you can go from zero to a usable prototype in hours, not weeks. These are also the tools that coding agents know best, which means faster iteration. Push a change and see results in seconds. With an AI-native codebase, even non-technical users can make changes through simple prompts.

Frontend

React and Next.js for web, React Native and Expo for mobile. One language across every platform, with a huge ecosystem and the best tooling around.

Data

Postgres on managed platforms like Neon or Supabase. Relational guarantees without the ops burden, plus built-in vector search for AI workloads.

Infrastructure

Vercel for web and agentic apps. Great DX with minimal operational overhead. For compute-heavy workloads, Hetzner bare metal is hard to beat on price.

AI

AI SDK fits naturally into the React stack. Same language, same patterns. Pair it with Vercel AI Gateway to route between model providers without changing code.

My Experience

2026

Independent

Agentic Engineer

Shipping end-to-end across web, mobile, and agentic apps. Partnering with non-technical founders on greenfield projects, getting involved early when the right decisions have the biggest impact.

2020

Signal Insights

Co-Founder & CTO

Co-founded a competitive intelligence platform and ran engineering. Built large-scale data collection infrastructure, ML-powered analytics, and customer-facing products. Grew the team from zero to acquisition by Similarweb.

2014

Cignium Technologies

VP Product Engineering

Led product engineering for sales enablement tools used by 700+ agents daily. Real-time lead distribution, performance tracking, and workflow automation. Built and managed distributed engineering teams across multiple time zones.

1999

Independent

Developer & Consultant

Built products through every major web era, from Classic ASP and Flash to modern React. Architecture consulting, hands-on development, and technical leadership for startups and enterprises. A track record of adapting to whatever the job requires.

Let's build
something great

hans@fjallemark.com