Software that has to work.
I am Jonatan Pedersen, a software consultant based in Copenhagen. For 25 years I have built production systems in healthcare, public health, and fintech, including a class IIb medical device, the booking platform for Denmark's COVID-19 vaccination programme, and accounting software used across Europe. I work with teams that need senior engineering on systems where reliability matters.
Currently available for new engagements.
How I can help
Software architecture and engineering
Architecture and hands-on development of TypeScript and Node.js systems: web applications, REST and OpenAPI services, OAuth and OIDC authentication, and standards-based frontends.
Regulated and medical software
Development and certification of software under IEC 62304 and IEC 82304, including a class IIb medical device, with the design controls, risk management, and documentation that audits require.
Fractional CTO and engineering leadership
Technical leadership for engineering teams: setting architecture and direction, hiring and structuring teams, and establishing development and release practices, based on prior roles as CTO and engineering manager.
Platform and scale
Design of systems for high load and reliability, including a queue handling 10,000 requests per second and the infrastructure for a national vaccination programme.
AI
Practical adoption of AI tooling: identifying where it delivers measurable value and where established engineering practices remain more effective.
Selected work
Hedia
Principal engineer and engineering manager on a class IIb diabetes-management medical device.
hedia.com ↗Practio
Supported the vaccination of more than 300,000 people against COVID-19; designed a booking queue handling 10,000 requests per second.
practio.dk ↗Debitoor and SumUp
CTO of an invoicing and accounting product used by small businesses across Europe.
sumup.com ↗Yahoo! and Kelkoo
Product development and search ranking for a European shopping comparison service.
yahoo.com ↗What people say
It's been a pleasure working with Jonatan - focused on solving the problem, building fast and cleaning up when we're live. Your next employer should consider itself lucky!
Søren Heupel
Jonatan has always been a strong performer. Jonatan finds solutions where others give up. He often uses evenings or weekends to find solutions for a problem! Jonatan is also a social person and a very good colleague
Bo Jensen
I've worked with Jonatan over the years on a variety of projects in Kelkoo and he is such pleasure to work with. He is reliable, honest and fast! He is clearly an expert in his field and is always quick to provide over-the-top solutions.
Asem Raza
Have a project in mind?
Send a brief description of your project and where you need support, and I will respond.