Open build
Bring the idea you have been sitting on. Any stack, any problem, as long as you build it on the day.
- Web, mobile, tools, games
- Best for mixed teams
- Web search and research APIs from Parallel
28TH November 2026 London
deen developers presents
build circuit
one day. three tracks. build to win.
choose your track
- 01open build
- 02voice + video agents
- 03hardware
tracks
Pick one when you register. Each track is judged on its own.
Voice + video agents
Build an agent people talk to and see. It should listen, reason and act, and hold up in a live demo.
- Speech in, speech out
- Agents with a face, powered by VEED
- Agents that take real actions
Hardware
Make something you can hold. Sensors, boards and code that does something in the physical world.
- Microcontrollers and sensors
- Prototypes you can demo on the table
- Starter kits provided by Axiometa
details
- Date
- Sat 28 Nov 2026
- Time
- All day, 9am–9pmbuild, ship, demo, win?
- Location
- Shoreditch, LondonVenue upon acceptance
- Tracks
- 3Open build, voice + video agents, hardware
- Prizes
- £1,000Cash prize per track
partners
The teams backing Build Circuit and the tools you'll build with.
Pick your track. Build to win.
Got an idea? Apply now. Applications are reviewed and selected based on quality of ideas, and we'll be in touch with next steps.
Open build, with Parallel
Whatever you build in the open track, Parallel gives it the web. Their APIs let your agents research, search, extract and monitor live web data with cited answers, all through one API.
Analyze the top 3 competitors to Ramp and their GTM strategy
| Entity | Target market | GTM approach | Key messages |
|---|---|---|---|
| Brex | VC-backed startups, tech firms, and global companies that want cards, spend controls, and banking in one stack | Brand-led startup acquisition, self-serve card adoption, and enterprise expansion through global spend management | Reach, brand trust, high limits, global FX, and a finance stack that scales past the first card program |
| Airbase | Mid-market finance teams that need procure-to-pay, AP automation, card controls, and close workflows | Finance-led sales motion around guided intake, purchase orders, AP automation, and ERP integrations | Procure-pay-close consolidation, stronger finance controls, and fewer disconnected AP and card tools |
| Expensify | SMBs, employees, and finance teams that start with receipt capture, reimbursements, and expense reporting | Product-led expense adoption with employee virality, app-store discovery, and a lightweight SMB buying path | Simple receipt workflows and reimbursements, but less breadth than unified cards, AP, procurement, and vendor management |
Monitor new product releases or feature changes from Stripe
ScanDaily
Stripe Product Updates Daily updates · just now
- 2d agoStripe brings a new checkout experience to Facebook
stripe.com/newsroom/news/checkout-for-facebook - 3d agoBilling changelog adds flexible billing mode for subscriptions
docs.stripe.com/changelog/basil/2025-06-30/billing-mode - 3d agoStripe Tour launches 40+ products across stablecoins, agentic commerce, payments, tax, and hardware
stripe.com/newsroom/news/tour-newyork-2025
Fetchmodel architecturefrom
https://arxiv.org/pdf/1706.03762
Attention Is All You Need
We propose a new simple network architecture, the Transformer, based solely on attention mechanisms, dispensing with recurrence and convolutions entirely. …
Web search, extraction, deep research and monitoring for AI agents, through one API.
Start building with ParallelVoice + video agents, with VEED
Give your agent a face. On the voice + video track you'll have VEED's video APIs: turn a photo and a voice into a talking video, sync lips to any audio and add captions, so your agent can be seen as well as heard.
Image to video
Fabric 1.0
Animate any image or subject using a prompt and audio. Generate video with synced lip movement, head motion and natural body movement.
Developer-first REST APIs. Send a photo, audio or video; get video back.
Learn more about VEEDHardware starter kits provided by Axiometa
Hardware starter kits are available from Axiometa. No previous experience required: use Axiometa Studio, their custom hardware vibe coding platform, to build real solutions on the day.
FAQ
Frequently asked questions
Who can take part?
Everyone is welcome to apply, as long as you can attend in person in Shoreditch, London.
How are teams selected?
Applications are reviewed and selected based on quality of ideas, so tell us what you want to build and the problem it solves.
Once you're selected, we'll email you the venue details and timings.
Can I participate remotely?
No. Build Circuit is an in-person event only.
How big can my team be?
Teams can have up to 4 people.
Can we enter more than one track, or switch later?
No. Each team picks one track when it signs up and stays in that track. You can't switch after signing up.
How long is building time?
You build through the day. Building ends and judging begins at 6pm.
When are winners announced?
On the same day. Building, demos and judging all happen on Sat 28 November, and winners are announced that day.
What are the judging criteria?
At a minimum, your solution needs to be:
- A working MVP
- Addressing a clear pain point
- With a direction to keep growing to support more users
Can I bring something I've already started?
No. To keep it fair, everything is built from scratch on the day. Bring ideas, not code or a finished prototype.
Do I need my own hardware kit?
Bring your own kit if you have one. If you don't, starter kits are available on the day, provided by Axiometa.