Safe software for (semi-)governments
That is why we help municipalities and recently the Ministry of Health with safe open-source software for various use cases.
Projects we worked on include safeguarding privacy in the CoronaCheck app and the secure exchange of personal data of citizens with identity wallet Yivi (formerly IRMA).
Our subjects
Security
- Secure development
- Threat analysis & code audit
- Authentication using DigiD, Yivi
Privacy by Design
- GDPR and data security
- Pilots with identity wallet Yivi
- Integration with Yivi
Development & operations
- Open-source development
- Common Ground
- Secure operations
Tech we like
Yivi (formerly IRMA). A privacy-friendly digital passport that enables you to disclose only the relevant attributes of yourself.

Featured project: ID-contact
The ID Contact innovation pilot is a collaboration between the municipalities of Arnhem, Nijmegen and the Drechtsteden and knowledge partners such as the Tax Authorities and iHub (Radboud University).
Within the ID Contact team, Tweede golf provided the technology: the software that makes secure digital identification possible.
Working with Tweede golf
We have a long-term focus: we like to collaborate as long as possible and have no plans to sell our company. We hope we can continue to do this until we retire. We believe that this perspective is essential in creating an environment in which you can do your best work, together, continuously.
Whatever project you work on with us, large or small, you will always encounter a strong engineering mindset, the search for ever better software and tools, for elegant solutions and for secure and privacy-friendly software.
Yivi Innovation Lab
Want to try working with us? Then our Yivi Innovation Lab is an interesting option. A short-term project with a fixed price and deliverable: a working demo that shows what value can be achieved with Yivi in a case that is relevant to you.
More practical experience
Blogs and cases you can use to judge our experience by
Privacy by Design Foundation
Tweede golf is preferred partner of the Privacy by Design Foundation, the founder of Yivi (formerly IRMA). We continu to contribute to technical support of Yivi, to the Yivi app for the City of Amsterdam and we work on Yivi innovations together with SIDN.
The future of the BSN and Dutch identification
Ruben
Software Engineer
Clients & partners



