1. Executive summary
Arbitrum Warsaw Builder Program with ETHWarsaw
ETHWarsaw is a community of builders in Poland, focused on growing the local Ethereum ecosystem through events, education, and collaboration.
Through the Arbitrum DAO grant, we achieved strong builder activation around Arbitrum, starting with a Twitter Space, followed by a blog post, then a presence at the ETHWarsaw conference, and finally a dedicated meetup.
Together, these activities gave Arbitrum three months of continuous presence in Warsaw, building awareness and engagement across both online and offline channels.
Website & Socials:
https://www.linkedin.com/company/ethwarsaw/
Grant deliverables
Twitter Space
We started our Arbitrum activations with a Twitter Space a week before the main ETHWarsaw Conference & Hackathon. It featured Arbitrum ecosystem voices (Mod: Marta Adamczyk, ETHWarsaw; kaerste.eth, L2Beat; Fabriziogiani7, Urbe.eth; gabeweb3_, Bleap; funwithgui, Bleap).
Substack Blogpost (sent as newsletter)
Before the main event, we also sent out a newsletter highlighting Arbitrum’s presence at the conference and sharing details about Arbitrum Stylus, which proved helpful for hackers preparing for the hackathon.
ETHWarsaw Conference & Hackathon
During the main event Arbitrum got 3 speaking opportunities:
- Mateusz Rzeszowski: “ArbitrumDAO - a System for Resilient Decision Making” (presentation)
- Tekr0x: “Mini Apps Are The New Playground (Also, Build on Arbitrum)” (presentation)
- Fabriziogiani7: "Introduction to Arbitrum Stylus: Writing High-Performance Smart Contracts with Rust and Cursor AI” (workshop)
- bonus: An Arbitrum DAO delegate, Krzysiek Urbański (kaereste.eth) took part in the discussion panel Are we there yet? State of onchain infrastructure and tooling”
The conference featured an Arbitrum DAO branded Chill Room
We also had a hot press for making customizable merch.
W had 6 projects submitting for the Arbitrum bounty for the best Arbitrum Stylus usage:
More photos from the conference:
Meetup
To reconnect with the Arbitrum builders after the conference, we organized a meetup, during which we gave hackathon participants an opportunity to share their stories of building on Arbitrum.
Video recording from th meetup: https://youtu.be/m2nEk24Y2ng
2. Performance Against KPIs
| Milestone | KPI / Activity | Target | Achieved | Notes / Links |
|---|---|---|---|---|
| 1. Online Activation | Twitter Space attendees | 30 | 106 | Strong engagement from Polish and regional Ethereum community |
| Blog post views | 700 | 955 | Published on ETHWarsaw blog and shared across socials | |
| Combined impressions (social + web + newsletter) | 2,500 | 4,758+ | Cumulative reach across ETHWarsaw channels | |
| 2. ETHWarsaw Conference Presence | Presentation delivered | 1 (100 expected attendees) |  Delivered |
— |
| Panel discussion delivered | 1 (100 expected attendees) | Delivered |
— | |
| Developer workshop conducted | 1 (25 expected developers) | Conducted |
— | |
| Arbitrum bounty integrated into hackathon | 1 | Integrated |
Hackathon categories | |
| Projects submitted using Arbitrum | 5–10 | 6 | All projects on Taikai | |
| Developers reached across talks, workshops & hackathon | 200+ | 205 hackers | Conference hosted 750 total attendees | |
| Arbitrum-branded Chill Room visibility | 1,000 attendees | ~750 attendees | Visible throughout the 4-day conference | |
| 3. Community Meetup | Luma signups | — | 83 | Final event in the activation series |
| Meetup attendance | 60 | ~60 | Local builder and community engagement |
3. Qualitative Impact & Community Feedback
Testimonials:
https://x.com/Yerbearserker/status/1963573506458960066
https://x.com/tekr0x/status/1966422245317763303
Grant announcement:
https://x.com/ETHWarsaw/status/1960741265244610604
User-generated content
https://x.com/queen_oddspades/status/1964228246502851016
https://x.com/ParrySondhi/status/1963587130271080626
4. Financial Summary
20% - Meetup (including venue, pizza, beverages, recording, photo, and team costs)
5% - Twitter Space
3% - Blogpost
Conference & Hackathon:
5% - Recording
10% - Visual branding
10% - Marketing
32% - Conference & Hackathon venue
10% - Hackathon bounties
5% - Other (licences, subscriptions, etc.)
There were no significant differences compared to the original budget.
5. Future Plans & Continued Ecosystem Alignment
We see strong potential to continue building on this collaboration and maintain Arbitrum’s presence in Warsaw, ideally through Kolektyw3, our year-round community and coworking space for builders. The space has proven effective for hosting technical events and connecting local teams with global ecosystems, and it could naturally evolve into a recurring home for Arbitrum-focused gatherings.
If further support becomes available, we would like to:
-
Organize regular meetups, workshops, and co-learning sessions for builders interested in Arbitrum tools and development.
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Include Arbitrum tracks in future bootcamps and hackathons coordinated by the ETHWarsaw team.
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Facilitate cross-regional collaboration with other European Arbitrum communities.
Our goal is to sustain the momentum created by this program and turn it into consistent, year-round engagement connecting Polish developers to the Arbitrum ecosystem in meaningful ways.