Team 1
Projects: fakestream, necho
- Engineering
- Engineering
- Design
- Business development
- Business development
pafin
Hackathon
OSS IT infrastructure2026 / 2nd
fakestream_
A dev tool that recreates Amazon Kinesis locally.
Released as open source (OSS).
Healthcare2026 / 2nd
Sumazou
A kiosk service that sends medical images from a hospital CD/DVD to your phone.
Crypto2024 / 1st
Crypto Tax
Simulator
Enter your salary and crypto profit
to see the estimated tax on the profit.
We've run two in-house hackathons at pafin. People from engineering, design, business and beyond team up and take an idea to a working prototype in just a few days. Here we focus on our 2026 hackathon, where every team built with AI, and the projects that grew out of it.
Amin Azmoudeh
Co-CEO, pafin Inc.
Message
Why we run a hackathon
In the age of AI, keeping up is not optional. The hackathon has three goals: to raise every employee's ability to use, master and multitask with AI tooling; to close the gap in AI proficiency across the company; and to find new projects, new businesses and new areas to take on.
We set the themes to be challenging, large in scale and interesting, whether or not they relate to pafin's existing services.
Working alongside colleagues with deeper experience, or more fluency with the tools, raises the quality of everyday work afterwards. On the first day I asked every team to put talking to and teaching each other above all else.
This second edition put the process ahead of ranking the projects.
Team
Four teams of mixed roles, each driving its own project
For the hackathon, teams were not made of engineers alone. Across the four teams we mixed in people from business development, marketing, customer success, HR and design.
What to build was left to each team.
A multinational team of 24 people from 11 countries
- Morocco
- France
- Belgium
- India
- Nepal
- China
- South Korea
- New Zealand
- Canada
- United States
- Japan
Home countries of our 24 members, including Japan (11 countries).
Team 2
Project: Emojact
- Engineering
- Engineering
- Engineering
- Customer success
Team 3
Project: Cryptrack
- Engineering
- Engineering
- Engineering
- Engineering
- HR
Team 4
Project: Sumazou
- Engineering
- Engineering
- Marketing
- Business development
Roles in each team at the second hackathon. See the pafin team ↗ (opens in a new tab)
The photo could not be loaded2026 / 2nd
Projects from the second hackathon
pafin Inc. held its second in-house hackathon, pafin Hackathon 2026, from June 22 to 26, 2026.
The final lineup was four teams, with a presentation session on June 26.
OSS IT infrastructure
fakestream
2nd hackathon (2026) / Open source
A development emulator that recreates Amazon Kinesis, AWS's data streaming service, on your own PC. It was developed to solve a challenge in our in-house development environment.
During the hackathon it replaced our in-house setup, and we later released it as open source under the MIT license.
Healthcare
Sumazou
2nd hackathon (2026) / Launched October 2026
A service that sends the medical images patients receive from a hospital on CD/DVD to their own smartphone, using a dedicated kiosk.
Insert the CD/DVD into the kiosk, scan the QR code on the kiosk screen with the Sumazou app, then enter the confirmation code shown on the phone into the kiosk.
After building a prototype at the hackathon, pafin kept developing it and launched Sumazou commercially in October 2026. Its adoption by Kanto Neurosurgical Hospital has also been announced.
Projects we are growing in-house
necho
A prototype social space where you take the form of a cat, a rock or a cloud and spend time doing nothing next to others. About 80% of the residents around you are AI, and the whole idea is that you can't tell who is a person and who is an AI.
It is not a place to chase likes. The aim is to leave a little lighter than you arrived. A demo was shared internally on presentation day.
PrototypeEmojact
Type the feeling or meaning you want to get across, and it finds the Slack custom emoji that match.
PrototypeCryptrack
A platform that gathers news and events about crypto regulation, exchanges and coins, so you can follow them in one place.
Prototype2024 / 1st
Projects from the first hackathon
The first edition, pafin Hackathon 2024, ran on May 23 and 24, 2024, with presentations on May 31.
CryptoCrypto Tax
1st hackathon (2024) / Released December 2024
Crypto Tax
Simulator
1st hackathon (2024) / Released December 2024
A free tool that estimates the tax on your crypto profit from your annual salary and that profit. The tool itself is in Japanese.
The tool came out of the first hackathon in 2024, and cryptact released it in December of the same year.
Projects we are growing in-house
recolul UI
pafin works on a full flextime system (opens in a new tab): each month has set working hours and a cap on work-from-home (WFH) hours. This in-house tool uses attendance records to work out the hours left to work and the WFH hours still available that month.
Builds for Windows, macOS and Ubuntu were shared internally in June 2024.
Shared internallypafin TV
A screen on the office TV that shows cryptact's sales and other numbers in real time. It was built so that members who rarely deal with numbers in their daily work can still get a feel for where the company stands. It is still on air in the office all day.
On air in the officebottin
A directory that puts pafin's services and links to internal tools in one place, so new members can quickly find what they need. It also folded in ideas for an internal portal and onboarding.
It is still live internally and used every day.
Live and in use internallyEVM address browser extension
A browser extension that adds context from pafin's data to EVM addresses (Ethereum-style wallet and smart contract addresses) on web pages.
PrototypeReleased
Projects that went live after the hackathons
First hackathon held
Build days on May 23 and 24, with presentations on May 31.
Crypto Tax Simulator released
cryptact released the Crypto Tax Simulator.
Read the announcement (Japanese) ↗ (opens in a new tab)Crypto Tax Simulator passes 70,000 users
More than 70,000 people have used it since its December 2024 launch. It now also covers the new tax rules and sole proprietors.
Read the announcement (Japanese) ↗ (opens in a new tab)Second hackathon held
The final lineup was four teams, with a presentation session on June 26.
fakestream released as open source
Released as a lightweight local emulator for Amazon Kinesis Data Streams.
Read the announcement ↗ (opens in a new tab)Sumazou launched
A service that sends hospital CT and MRI images on CD/DVD to patients' smartphones.
Read the announcement (Japanese) ↗ (opens in a new tab)Sumazou exhibited at a conference
Sumazou exhibited at the 24th Annual Congress of Japan Clinical Health Care and Welfare (ACJCHW 2026).
Read the announcement (Japanese) ↗ (opens in a new tab)- Next
What comes next
Alongside updates to projects already live, we will share updates here on projects still in development internally and on new initiatives as they progress.
About pafin
More about pafin
Our peopleTeam ↗A multinational team of 24 people from 11 countries. Meet them and their backgrounds. (opens in a new tab)
What we doOur products
- cryptact ↗ (opens in a new tab)automatic crypto gain and loss calculation for tax filing
- defitact ↗ (opens in a new tab)makes blockchain activity visible to manage DeFi, wallets and NFTs
- Medical AI project ↗ (opens in a new tab)with the University of Tokyo and SoftBank, collecting and sharing medical image data (Japanese)