Mobile app development with React Native. Single code base, cross-platform.

What We Do

App Development

We build apps for Android and iOS using React Native. Single codebase, native user experience. Best of both worlds.

Cross-stack Products

Your user’s journey spans across web and mobile. So do our engineers. We build cohesive platforms that let you focus on your product.

Bootstrapping Teams

Your team can build better products faster with React Native, but finding the right path can be difficult. Our expert engineers help you get there.

Talk to us : Meet Jani Eväkallio

An early adopter and advocate of React Native, Jani knows the platform inside out. As the VP of Mobile Engineering at Formidable, he leads teams discovering the best practices of mobile development in the React era. Whether building UIs for mobile, web, or the cockpit of your car, his work has a singular purpose: to build software people love to use.

Contact Jani
Jani Eväkallio
Our Philosophy

At Formidable, quality is paramount. Thoughtful decisions about software improve every aspect of development, from developer speed to user experience, ultimately impacting the bottom line. We thrive when expert advice and problem solving is needed, and create sensible solutions without breaking your current dev processes. Working alongside your team, we not only build maintainable infrastructure but also educate in best practices.

Case Study

Walmart React Native Pharmacy

Building native applications with JavaScript and React - Just what the Doctor ordered

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Case Study

React Native App Stack, March 2017

This week, we started writing a new React Native app, an opportunity to right all past mistakes, and a chance to make a thousand new ones.

View the blog post

How We Work


Our clients choose Formidable when they have challenging software issues that need solid, scalable solutions. We assess current state and recommend the right technological solution to support our client's business goals.


After assessment, we dive into the code side by side with our client's engineering teams. Working as an embedded team, we implement the solution in an agile, iterative way.


Formidable delivers more than application development. With the long-term maintainability of the systems in mind, we level up our client's team so they're comfortable taking on future maintenance.

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Work with us