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I'm Daniel, a freelance full-stack developer in Helsinki. I turn ideas into polished web and mobile products, shipped end to end and built to last.

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About me

A developer who cares about the details

Daniel DunderfeltFreelance developer

I'm Daniel Dunderfelt, a freelance full-stack developer based in Helsinki. I've been building software for the web and mobile for over a decade, and for the last several years I've done it independently, taking products from an empty repo all the way to real users in production.

I'm most at home with TypeScript, React, and React Native, but I choose the right tool for the job and I'm not afraid of unfamiliar ground. Above all I care about the experience: making products that feel delightful, accessible, and genuinely intuitive to use.

I don't want to be just an extra pair of hands. Clients keep me around because I help level up the whole team: planning solutions with product owners, thinking through hard problems with senior devs, and mentoring the people I build alongside.

Read my full CV See my work

Let's build something you're proud to ship.

+12Years of experience

+15Clients

+20Products shipped

Selected work

A few projects I'm proud of

Mobile app development for HUS

React Native mobile development is one of my core strengths, and HUS is where I got to put it to work: as lead developer on Omapolku, a healthcare app used by real patients on iOS and Android.

Internal applications for Fingrid

I worked on two applications for Fingrid, both critical to maintaining the Finnish national electricity grid.

View all projects

Reviews

Kind words from people I've built with

Daniel worked with my wider engineering team as we built new apps, including the backend, from scratch. With limited experience in the team, he not only drove a large part of the development but also mentored several team members, supporting our overall upskilling. Daniel was a pleasure to work with and highly regarded, not just within the immediate team but across the wider organisation, including design and product.

Tor Tigerstedt

Product Director, Store Operations · Relex

Working with Daniel is extremely efficient and easy. He is fast, reliable and presents his comprehensive views clearly and constructively. He'd absolutely be in my dream team.

Antti Karvanen

Head of Development · A-lehdet

Daniel is a highly active and trustworthy developer, consistently delivering excellent work. His dedication and reliability makes him an invaluable asset to any team.

Samuel Thesleff

Founder · Muuvin

He communicated clearly about technical solutions and challenges, and gave me good suggestions I hadn't thought of. We met the project's goals and I would gladly work with Daniel again.

Marcin Pohjanpalo

Operational Grid Expert · Fingrid

Daniel worked in a multi-vendor environment as our main point of contact. We greatly value his professional skills and can strongly recommend him for similar tasks.

Jaakko Tepponen

Tech Lead · Mirum

We worked with Daniel for about a year. The collaboration was enjoyable. Daniel is a results-oriented, solution-focused, and self-directed developer.

Mikko Poranen

Head of Development · Fingrid

Apps

Side projects, in the works

I'm building a handful of apps of my own, small products I actually want to exist. They're not quite ready to show yet.

Take a peek

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