Hannah Weiss

@hannahweiss

Joined Jul 2026
12 Followers
9 Posts
Last posted Oct 18, 2026

Clinical informatics engineer in Berlin. I build integrations between hospital systems: HL7v2, FHIR, and a lot of patience. Formerly a nurse, which explains my opinions about alert fatigue.

Known for

#1 in Vitals and Variables· 98 rep
#2 in Security Theatre· 9 rep
#3 in Rerender Anonymous· 8 rep

Posts: 9
Followers: 12
Views: 1.9K
Points: 140

Posts

Everything this author has published.

16 votes

Be honest: how does your database store timestamps?

Hannah Weiss179·Oct 18, 2026

article

In ten days the clocks go back. Is your medication schedule ready?

t/vitals_and_variables3 min

On the last Sunday of October most of Europe goes back from summer time to standard time, and the hour from 02:00 to 03:00 happens twice. For most software…

Hannah Weiss78·Oct 15, 2026

Friendly reminder: "the data are anonymised" is a claim, not a property. Ask how. Ask who checked. Ask what happens when someone combines it with a second dataset.

Hannah Weiss47·Oct 12, 2026

question

React form library for very long clinical forms (200+ fields), what holds up?

3 answers

t/rerender-anonymous

A small team I advise is building an assessment form for nursing homes. It has more than 200 fields in about 15 sections, many conditional fields ("if a fall…

Hannah Weiss125·Sep 23, 2026

article

Pseudonymisation is not anonymisation: a note for people building health apps in the EU

t/security-theatre3 min

I review data flows for health projects quite often, and one sentence appears in almost every design document: "the data are anonymised". Then I look closer…

Hannah Weiss132·Sep 14, 2026

14 votes

t/vitals_and_variables

Which healthcare interoperability standard have you actually touched at work?

Hannah Weiss51·Sep 5, 2026

experience

What night shifts on a cardiology ward taught me about alert fatigue

t/vitals_and_variables2 min

Before I became an engineer I was a nurse for six years, the last three on a cardiology ward. I want to describe one thing from that time, because I see the…

Hannah Weiss378·Aug 28, 2026

article

HL7 v2 is not dead, it is just pipes and carets

t/vitals_and_variables3 min

Last time I promised something about HL7 v2. Here it is. If FHIR is the modern REST API, v2 is the message format that has been running inside hospitals since…

Hannah Weiss244·Aug 10, 2026

article

FHIR for backend developers who were just told "we need FHIR"

t/vitals_and_variables4 min

Since three years I spend most of my working time between hospital systems, and the most common message I get from other developers is some version of: "the…

Hannah Weiss643·Jul 30, 2026

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Hannah Weiss

Known for

Posts

Be honest: how does your database store timestamps?

In ten days the clocks go back. Is your medication schedule ready?

Pseudonymisation is not anonymisation: a note for people building health apps in the EU

Which healthcare interoperability standard have you actually touched at work?

What night shifts on a cardiology ward taught me about alert fatigue

HL7 v2 is not dead, it is just pipes and carets

FHIR for backend developers who were just told "we need FHIR"

Links

Badges earned

Century

Generalist

Settling In

Getting Started

First Readers

Worth Keeping

Quotable

First Applause

Someone’s Listening

Finding People

Explorer

Straw Poll

Curious

Said Hello

First Post