Emmanuel

Data Science & AI student at Leiden University. Building Examenzaal: practice exams for Dutch certification exams.

Joined on Sep 14, 2026 https://examenzaal.nl/

Emmanuel

Nov 13

One scorer for seven question types: all-or-nothing, and the empty-key bug it is built to avoid

#typescript #testing #education #webdev

4 min read

Emmanuel

Nov 12

Stripe fulfilment from two paths: three idempotency keys and a test for a hanging email provider

#stripe #typescript #postgres #testing

4 min read

Emmanuel

Nov 11

Shipping a new exam type: 322 drafts, 18 verifier failures, and what the two checkers disagreed on

#ai #testing #typescript #education

4 min read

Emmanuel

Nov 9

Two questions that ask the same thing: how we catch near-twins before they reach a practice exam

#postgres #testing #typescript #education

4 min read

Emmanuel

Nov 5

Our deploy timed out: one static worker, 60 seconds per page

#nextjs #vercel #performance #webdev

6 min read

Emmanuel

Nov 5

Six practice exams from a thin question bank

#algorithms #typescript #testing #education

6 min read

Emmanuel

Nov 5

Our exam questions store buoys as data, and a broken spec shows text instead of a guessed picture

#svg #typescript #testing #webdev

6 min read

Emmanuel

Nov 5

Three models, no human reviewer: how we gate AI-written exam questions

#ai #llm #testing #education

4 min read

Emmanuel

Nov 5

Our 404 page answers 200, and we decided to keep it that way

#nextjs #react #webdev #seo

4 min read

Emmanuel

Nov 5

The right answer was the odd one out 67 % of the time

#ai #education #testing #llm

4 min read

DEV Community

Emmanuel

Badges

Writing Debut

One scorer for seven question types: all-or-nothing, and the empty-key bug it is built to avoid

Stripe fulfilment from two paths: three idempotency keys and a test for a hanging email provider

Shipping a new exam type: 322 drafts, 18 verifier failures, and what the two checkers disagreed on

Two questions that ask the same thing: how we catch near-twins before they reach a practice exam

Our deploy timed out: one static worker, 60 seconds per page

Six practice exams from a thin question bank

Our exam questions store buoys as data, and a broken spec shows text instead of a guessed picture

Three models, no human reviewer: how we gate AI-written exam questions

Our 404 page answers 200, and we decided to keep it that way

The right answer was the odd one out 67 % of the time