DevHorizon2026
The DevHorizon auditorium filling up before the first talk

16 OCT 2026 · Lisbon, Portugal

DevHorizon 2026

One room. One day. The web, looking forward.

A single-track, single-day conference about the modern web platform — practical front-end talks you can use the Monday after.

Get tickets — from €279 See the lineup
—days
—hrs
—min
—sec
8
speakers
1
track, zero clashes
480
seats
7h
of talks + hallway

What it is

A whole day, one room, no clashes.

DevHorizon is a one-day, single-track conference for people who build for the browser. No parallel tracks, no FOMO, no choosing between two talks you both wanted — everyone sees everything, together, in one room.

01

Built for builders

Eight talks, each grounded in something the speaker actually shipped. We brief every speaker to leave you with a technique you can try the next working day — not a roadmap slide.

02

One track, on purpose

A single track means a shared experience. The hallway conversations over coffee are about the same talk everyone just watched, and they are usually the best part of the day.

03

The whole platform

CSS that finally does what you wanted, less JavaScript on the wire, forms that validate, view transitions, local-first sync, and accessibility as an API. The modern web, end to end.

Who it's for

Front-end and full-stack engineers, design engineers, and tech leads who ship to the browser and want to keep their edge sharp. Whether you live in React all day or write the platform raw, you will leave with something to use.

  • FormatSingle track · 480 seats
  • WhenFriday, October 16, 2026 · doors 08:30
  • WhereLisbon Congress Centre, Lisbon, Portugal
  • LanguageEnglish · live captioned

The lineup

Eight people who shipped it.

Every talk comes from someone who built the thing they are talking about. Tap a card to read the abstract.

  • Una Castellano, Principal Engineer at Vercel Keynote Una Castellano Principal Engineer · Vercel “The Layout Engine in Your Head” Read abstract Hide abstract

    Container queries, subgrid, and :has() have quietly turned CSS into a real layout language. We will rebuild a stubborn responsive component three ways and watch the JavaScript disappear.

  • Kenji Watanabe, Staff Engineer at Shopify Kenji Watanabe Staff Engineer · Shopify “Shipping Less JavaScript” Read abstract Hide abstract

    Islands, streaming, and the edge are not buzzwords — they are a budget. A live look at trimming a real storefront from 480 KB of JS to 90 KB without losing a single interaction.

  • Amara Okonkwo, Web Platform Lead at Adobe Amara Okonkwo Web Platform Lead · Adobe “Forms Are a Platform” Read abstract Hide abstract

    Form-associated custom elements, the Constraint Validation API, and the new Popover and Anchor primitives let you build a real design-system input that validates natively. No framework required.

  • Theo Brandt, Developer Advocate at Chrome Theo Brandt Developer Advocate · Chrome “View Transitions Everywhere” Read abstract Hide abstract

    Native cross-document view transitions ship today. We will take a plain multi-page site and give it app-like page animations in about fifteen lines of CSS — then talk about when not to.

  • Priya Raman, Co-founder at Driftsync Priya Raman Co-founder · Driftsync “Local-First, Finally” Read abstract Hide abstract

    Sync engines and CRDTs have grown up. A pragmatic tour of building an app that works offline, syncs in the background, and never shows a spinner — and the three places it will bite you.

  • Marco Silva, Design Engineer at Linear Marco Silva Design Engineer · Linear “oklch in Production” Read abstract Hide abstract

    Wide-gamut color, perceptual lightness, and relative color syntax change how you build a theme. How we moved an entire product palette to oklch — and the accessibility wins we did not expect.

  • Hannah Lindqvist, Engineering Manager at Figma Hannah Lindqvist Engineering Manager · Figma “Testing the Untestable” Read abstract Hide abstract

    Playwright, the Trace Viewer, and component testing have made end-to-end tests something you actually want to write. A workflow for tests that catch real regressions and never flake.

  • Diego Fuentes, Accessibility Engineer at GitHub Keynote Diego Fuentes Accessibility Engineer · GitHub “The Accessibility Tree Is Your API” Read abstract Hide abstract

    Closing keynote. Stop bolting on ARIA at the end. When you treat the accessibility tree as the contract your UI exposes, better semantics and better tests fall out for free.

The day, hour by hour

One track. Everyone sees everything.

Friday, October 16, 2026 at Lisbon Congress Centre. Doors and coffee from 08:30; the first talk lands at 09:30 sharp.

  1. Doors, coffee & pastéis de nata

    Badge pickup opens in the foyer.

  2. Welcome & housekeeping

    Your hosts kick off the day.

  3. The Layout Engine in Your Head

    Una Castellano · Vercel

  4. Shipping Less JavaScript

    Kenji Watanabe · Shopify

  5. Coffee break

    30 minutes. Stretch, refill, find a stranger to argue with.

  6. Forms Are a Platform

    Amara Okonkwo · Adobe

  7. View Transitions Everywhere

    Theo Brandt · Chrome

  8. Lunch

    Hot buffet in the foyer. Vegan, veggie, and gluten-free clearly labelled.

  9. Local-First, Finally

    Priya Raman · Driftsync

  10. oklch in Production

    Marco Silva · Linear

  11. Coffee break

    30 minutes. The good espresso machine is by the windows.

  12. Testing the Untestable

    Hannah Lindqvist · Figma

  13. The Accessibility Tree Is Your API

    Diego Fuentes · GitHub

    Closing keynote.

  14. Closing remarks & raffle

  15. After-party on the river terrace

    Drinks, DJ, and the Tagus at sunset. Runs until 19:30.

Tickets

Pick a seat. Recordings included.

One flat price for the whole day — talks, lunch, coffee, the after-party, and the recordings. No upsells, no platinum-only hallway.

Early Bird

€219 per person

The first 150 seats. Gone now — but this is the price returning attendees still talk about.

  • Full day, all eight talks
  • Lunch, coffee & pastries
  • After-party on the terrace
  • Talk recordings within two weeks
Sold out
Most popular

Standard

€319 per person

The main ticket. Everything you need for the day, plus the recordings to revisit it.

  • Full day, all eight talks
  • Lunch, coffee & pastries
  • After-party on the terrace
  • Talk recordings within two weeks
  • Conference T-shirt & sticker pack
Get a ticket

Team

€279 per seat · 4 or more

Bring the whole front-end team. One invoice, reserved seating together, and a real discount.

  • Everything in Standard
  • 4+ seats on a single invoice
  • Reserved block of seats together
  • Swap names up to 48h before
  • Priority lunch seating
Buy team seats

Checkout is handled by our ticketing partner — VAT invoice generated automatically. Full refund up to 30 days out, free name transfers right up to the morning of the event. Need a hardship or diversity ticket? Apply here.

Venue & travel

Lisbon Congress Centre

Praça das Indústrias 1, 1300-307 Lisboa, Portugal

DevHorizon takes over Auditorium I at the Lisbon Congress Centre — a riverside venue in Alcântara with a glass façade, terrible acoustics for side conversations and excellent ones for talks, and a terrace looking straight out over the Tagus.

Open in Maps
The glass façade of the Lisbon Congress Centre at dusk, with the river behind it

Getting there

  • From the airport Humberto Delgado Airport (LIS) is about 20 minutes by taxi or 30 by metro + tram. A ride-share to the venue runs roughly €15–€20.
  • By tram & train The 15E tram and the Cascais line both stop a short walk away at Alcântara. From central Lisbon it is 15 minutes; from Cais do Sodré, ten.
  • On foot from the river If you are staying in Alcântara or LX Factory, it is a flat, pleasant 10-minute walk along the waterfront. We will have signage from the tram stop.

Where to stay

  • Pestana Palace Lisboa Splurge 7-minute drive. A grand 19th-century palace hotel. Use code DEVHORIZON for 15% off until September 18.
  • The Vintage House — Alcântara Recommended 10-minute walk. Mid-range, design-forward rooms right by LX Factory and the venue.
  • HUB Lisbon Hostel & Suites Budget 12-minute tram. Private rooms and dorms for attendees keeping it lean. Walkable to the after-party.

Sponsors

Made possible by good tools.

The companies below keep the tickets affordable and the espresso flowing. We only take sponsors our attendees actually use.

Platinum They make the day possible.
Gold They keep the coffee hot.
Community Friends of the front end.

Put your tool in front of 480 engineers who ship to the browser.

Become a sponsor

Good to know

Questions, answered.

Is it really a single track?

Yes. One room, one talk at a time, all day. You will never have to pick between two sessions, and every conversation at the break is about the thing everyone just watched.

Will the talks be recorded?

Every talk is professionally recorded. Ticket holders get the full set within two weeks, and they go public on the DevHorizon channel a month after that.

What is included with a ticket?

The full day of talks, lunch, all-day coffee and pastries, and entry to the after-party on the river terrace. Standard and Team tickets also include the conference T-shirt and sticker pack.

Can I get an invoice for my company?

Of course. Every ticket type generates a proper VAT invoice at checkout, and Team tickets settle on a single invoice. Email tickets@devhorizon.dev if your finance team needs anything specific.

Do you offer diversity or hardship tickets?

We hold back a block of free and discounted tickets every year for folks who would otherwise not be able to attend. Apply through the link in the footer — no long form, no questions about why.

What about refunds?

Full refund up to 30 days before the event, 50% up to 14 days before. After that you can transfer your ticket to someone else for free, right up to the morning of the conference.