We are Cobalt Sign
Your Mobile App Development Experts
Taking a structured approach to creating successful iOS & Android apps, from idea to market. Specialized in fintech & healthcare industries.
International awards for app development & design
Reliable
Integrity is our core value
Talented
Passionate team of engineers
Transparent
Agile approach and open communication
Agile & Professional
We build mobile apps using Flutter, Swift & Kotlin or React Native for innovative companies from Europe & worldwide.
For established businesses
seeking to build a mobile app equivalent for an existing web product or a proof of concept app (POC), we act as your specialized mobile team that augments your existing web team’s work. We create mobile specs, UX & UI design to ensure best practices and requirements from Apple & Google are met and collaborate closely with your product team throughout the app development process.
For startups
and new businesses seeking to launch and scale rapidly, we help you translate your high-level ideas into digital products. We typically start by creating your MVP (minimum viable product) to launch and reach the market, followed by validating ideas and building teams to expedite product development processes.

Product Development
Gathering requirements, creating the concept, defining the roadmap. Proof of concept (POC), minimum viable product (MVP), scaling.

UX & UI Design
Rapid prototyping, research, user testing, wireframes and a beautiful design, following Apple's and Google's guidelines, to ensure a successful app with high ratings.

App Development
Native mobile, web and wearable app development using Flutter, Swift, Kotlin, React Native and ReactJS.

Product Launch
Guidance for app stores setup and optimization, QA, deliveries & updates, continuous integration.
Testimonials
Some of our work










International Awards
We always love a good challenge, enjoy taking part in competitions and, of course, receiving awards.
Samsung Gear App Challenge
We created a wearable version of our Tea Cup app designed for Samsung Gear 2. It was one of the winners in Round 1 of the Challenge.
Nokia Developer Champion
Awarded to Oana Csertus in May 2013. “Nokia Developer Champion is a recognition and reward program for top mobile app developers from around the world.”
Fast Track to the Mobile App
App design & development competition by Core77 and Microsoft in November 2011. Our app, 1tap2send was one of the notable finalists.
Imagine Cup “Rockstar”
“Windows Phone Rockstar Award” 2010. We reached the top 10 with our app, Hawkeye, a travel trails app, that organised your photos and created a map trail.



Our Style
Engineering & Passion
It is all chemistry. We enjoy building mobile apps and staying up to date with the latest news & technologies in app development. The languages of our choice are Swift, Kotlin/Java and React Native.
Our proven chemical formula for the best product = passion + attention to details + UX + tech skills + reliable team + good communication
Our Values
Teamwork & Good Times
We care a lot about team spirit and enjoying time at the office.
Contributing to the community is important for us, we organize free app development courses & we develop pro-bono apps for NGOs.


