Tomasz Żyłka
Founder of ClassKasa
He builds ClassKasa because he thinks a class treasurer deserves fifteen minutes a week instead of three hours. By day he writes code, and in his free time he plays squash. He writes about class money: how treasurers collect it without chasing anyone, what parents need to see, and how the bank connection works.
Articles by Tomasz (12)
Switching Your Class Fund to an App Mid-Year: An Evening's Job
Yes, you can move the class fund to ClassKasa mid-year. Carry over the balance, invite families with one link and keep collecting. Step by step.
We pentested ClassKasa with Claude Code and an open-source toolkit: 8 fixes, 3 of them High
What pentest-ai-agents is, how its two tiers work, and what an authorized run against ClassKasa in May 2026 led to: 8 fixes, a full re-attack and 3 more closed.
ClassKasa on your phone: no app store, add it to your home screen
How to put ClassKasa on your Android or iPhone home screen in four taps, what the installed app does, and how we keep it working on phone-sized screens.
OWASP ZAP in plain words: what it is and 10 checks you will meet in every first scan
What OWASP ZAP is, what its baseline scan does (and does not), ten typical findings explained without jargon, and what runs on every ClassKasa change.
Class Treasurer Guide 2026: How to Run a Class Fund Online
How to be a class treasurer and collect a class fund online in 2026: what the job is, a step-by-step method, the tools compared honestly, and how to pick one.
I Said It Out Loud, Slowly, Twice
A field report from the school hall, where a sum of money was announced clearly and understood by absolutely nobody within ninety seconds.
The Payment That Arrived In August
A treasurer thought one family's contribution was gone for good, until a single notification landed mid holiday with the subject line sry.
The Best App for Class Treasurers: An Honest 2026 Roundup
An honest 2026 look at the best app for class treasurer duty: Collctiv, Collection Pot, Cheddar Up, PayPal, a plain spreadsheet and ClassKasa compared.
The Class Kitty, Without the Chaos
Every class kitty starts hopeful in September and ends in June archaeology. Three rules keep the pot sane, from a parent who actually runs one.
Collecting School Trip Money From Parents - a Guide
A class rep's guide to collecting school trip money from parents: one amount, one deadline, kind reminders and no public naming. Two templates inside.
The Beach Has Wifi, Unfortunately
A dispatch from a sun lounger in July, where "the class fund is closed for summer" turns out to mean one banking app and one still-missing dad.
The Snail Stays, The Maths Doesn't
A field report from week one of the class fund, filed at 23:40 from a spreadsheet called dues_2026_FINAL_v3_fixed(2).