- One paid conference of the year → QCon London (Mar 16-19) for senior-curated tracks [1], or GOTO Copenhagen (Sep 28-Oct 2) for a more practitioner-techie vibe at lower cost [3][25].
- Best price/value → Devoxx Belgium (Oct 5-9, Antwerp): 5 days, 200+ talks, €695 conference ticket [6].
- Free and most diverse content → FOSDEM (Jan 31-Feb 1, Brussels): ~8,000 hackers, 65 dev-rooms, €0 [18].
- For polished design / architecture content → Craft (Jun 4-5, Budapest) — small, curated, high signal [10].
- Skip: WeAreDevelopers World Congress if you want depth — it's 15,000 people and an expo floor first, technical depth second [12].
2026 calendar at a glance
| Conference | Dates | City | Audience | Scale | Price (in-person) |
|---|---|---|---|---|---|
| FOSDEM | Jan 31 - Feb 1 | Brussels | Open-source devs | ~8,000 [18] | Free [19] |
| JFokus Java/JVM | Feb 2-4 | Stockholm | Java/JVM devs | ~2,000 | SEK 3,995-8,990 [22] |
| QCon London | Mar 16-19 | London | Senior eng / Staff+ / architects | ~1,500, 75+ speakers | £ (see site, ex-VAT) [28] |
| Spring I/O Spring/Java | Apr 13-15 | Barcelona | Spring backend devs | 1,200+ [23] | € (see site) |
| DevDays Europe | May 19-22 | Vilnius | Mid-senior generalists | 700+, 35+ countries [17] | €1,150-1,510 + VAT [17] |
| NDC Copenhagen | Jun 1-4 | Copenhagen | .NET-leaning generalists | ~70 speakers, 80 talks [9] | € (see site) |
| Craft | Jun 4-5 [10] | Budapest | Architects, eng leadership | Small, curated | € (early bird available) [11] |
| DDD Europe DDD | Jun 8-12 | Antwerp | Architects, complex-systems | Specialised | € (ti.to) |
| WeAreDevelopers WC | Jul 8-10 | Berlin | Mass-market, all levels | 15,000+, 500+ speakers [12] | €490-799 [13] |
| JavaZone Java | Sep 2-3 | Oslo (Lillestrøm) | Java community | 2,000+, 100+ speakers [21] | NOK (see site) |
| NDC Oslo | Sep 14-18 | Oslo | .NET-leaning generalists | 150 speakers, 160 sessions [7] | NOK 16,490-22,490 EB [8] |
| GOTO Copenhagen | Sep 28 - Oct 2 | Copenhagen | Practitioners, team leads | ~1,200 [3] | DKK (see site, EB ends May 1) [3] |
| Devoxx Belgium | Oct 5-9 | Antwerp | Java-leaning, broad | 3,800+ [5] | €445-995 + VAT [6] |
| Code BEAM Europe Erlang/Elixir | Oct 21-22 | Haarlem (NL) | BEAM community | Specialised [24] | € (see site) |
| Øredev | Nov 4-6 [14] | Malmö | Generalists, full SDLC | 1,200+, 8 stages, 100+ sessions [15] | SEK (see site) |
| Build Stuff | Dec 2-4 | Vilnius | Generalists | Largest in Baltics [16] | €350-1,090 [16] |
Pills mark conferences narrower than “general SE” — included for date context but covered in dedicated language/domain reports.
CFP status (as of 2026-05-01)
Most general-SE flagships have already closed for 2026. Here's the residual picture for speakers:
| Conference | CFP status | Notes |
|---|---|---|
| Build Stuff Vilnius | ⚠ Not yet open for 2026 (site still shows 2025 copy)[29] | Historical pattern: Sessionize CFP opens mid-summer for a December event |
| Øredev | ✗ Closed 31 Mar 2026[30] | 20th edition; plan for 2027 (CFP typically opens Q4) |
| DevDays Europe | ✗ Closed; event 19-22 May 2026 | Plan for 2027 |
| GOTO Copenhagen | n/a — invitation/program-committee curation | Pitch via speakers page; no public deadline ever surfaces |
| QCon London | n/a — InfoQ-curated, invitation-led | Plan for QCon London 2027 (typically mid-March) |
| Devoxx UK | ✗ Closed 9 Jan 2026[31] | Event 6-7 May 2026 |
| Devoxx Belgium | ⚠ Opens 1 Jun 2026, closes 17 Jul 2026[5] | Highest-signal practitioner CFP still ahead |
| JavaZone | ✗ Closed 13 Apr 2026[32] | Plan for 2027 |
| JFokus | ✗ Closed (event already past, Feb 2-4) | JFokus 2027 CFP typically opens Sep 2026 |
| Spring I/O | ✗ Event already past (Apr 13-15) | Spring I/O 2027 CFP typically opens early autumn |
| Craft Conference | ✗ Closed 31 Jan 2026[33] | Plan for 2027 |
| WeAreDevelopers WC | n/a — separate CFA / sponsor-driven track | Submit via the official site as it opens new tracks |
| FOSDEM 2026 | ✗ Past (Jan 31 - Feb 1) | FOSDEM 2027 dev-room CFPs open mid-Sep 2026 |
The actionable summary: Devoxx Belgium (1 Jun - 17 Jul) and Build Stuff Vilnius (opens mid-summer) are the only two practitioner-tier CFPs in this list still ahead. Everything else is 2027-cycle planning.
The shortlist — what to actually pick
QCon London Tier 1
Senior-engineer-first programme: AI engineering, debugging distributed systems, modern performance, building eng teams, software security, Tech of Finance, Staff+ leadership [2]. Tracks are practitioner-curated and the CFP is invitation-led, which keeps signal high but means fewer surprise talks [25].
Pick if: you're a Staff+ engineer, architect or eng manager and need a year's worth of trend-spotting in 3 days. Pricier than peers and ⚠ leans corporate — InfoQ/C4Media is the publisher, audience skews enterprise [1].
GOTO Copenhagen Tier 1
2026 theme is “Engineering for Reality”: concurrency, distributed systems, observability, legacy modernisation, sustainability, agentic software development, “being human in the age of AI” [3]. GOTO has a more open CFP than QCon and is generally seen as the techie-practitioner counterpart at lower cost [25].
Pick if: you'd rather hear from senior engineers than from VPs. The only European GOTO event in 2026 — Aarhus and Amsterdam are dark this year [4].
Devoxx Belgium Tier 1
5 days at €995 combi (€695 conference / €445 deep-dive) is the best signal-per-euro on the European calendar [6]. Tracks: Java, GenAI & Beyond, Architecture, Security, Server-Side Java, Dev Practices, People & Culture, Build Different, Mind the Geek [5].
Pick if: you can stomach a Java-leaning program — half the talks are language-agnostic (architecture, AI, dev practices). ⚠ Tickets sell in timed batches (Aug 17 / Aug 31) and routinely sell out in minutes [6].
Craft Conference Tier 1
Two-day single-track-feel conference with a strong reputation for design / architecture / leadership talks. 2026 line-up includes Gergely Orosz and other senior practitioners [11].
Pick if: you want quality over quantity, and a more European-feeling crowd than the big-tent conferences. Often combined with a few days in Budapest as a working trip.
FOSDEM Tier 1 (free)
Europe's largest open-source developer gathering. 65 dev-rooms covering everything from Rust to compilers to package management to community/governance [18]. Free, no registration [19].
Pick if: your work touches OSS at all. ⚠ Cold, crowded, hallway-track is the real value — go in with a list of dev-rooms you want to camp in.
NDC Oslo Tier 2
Five-day mega-conference (2 workshop days + 3 conference days) [7]. .NET DNA but the program has gone broadly polyglot — architecture, AI, security, leadership tracks all show up. Pricey: NOK 22,490 all-access early bird (~€1,950) + 25% MVA [8].
Pick if: you want depth + workshops in one trip and don't mind .NET overrepresentation. NDC Copenhagen (Jun 1-4) is the smaller sibling at lower cost [9].
Øredev Tier 2
20th edition in 2026 — Scandinavia's other major generalist conference. 100+ sessions covering programming through project management, with explicit diversity focus [15].
Pick if: you want a slightly less hype-driven conference than NDC and like the Malmö/Copenhagen geography (15-min train across the Øresund).
Build Stuff Tier 2
End-of-year generalist conference, AI safety and cybersecurity featured prominently. Onsite tickets €350 (1-day) to €1,090 (VIP 3-day); online option from €380 [16].
Pick if: you missed the autumn rush or want a December trip to Vilnius. Smaller crowd, easier networking than Berlin/Antwerp.
DevDays Europe Tier 2
Workshops + 3-day conference; 52% of attendees self-report as senior, 28% mid-level [17]. Bundled with DevOps Pro and CyberWiseCon (one ticket, three events).
Pick if: you want a workshop-heavy week. ⚠ At €1,150-1,510 it sits in QCon territory without QCon's brand pull — it earns its place if you actually do the workshops.
WeAreDevelopers World Congress Tier 3
Largest pure-developer conference in Europe by headcount — 500+ speakers, 8,000+ companies, 40,000 sqm expo [12]. Tickets €490 early bird → €799 standard [13]. Industry round-ups credit it with maintaining quality despite size [27].
Pick if: you specifically value scale, a giant expo, or recruiting. ⚠ Senior-engineer signal density is lower than QCon/GOTO/Devoxx — too much marketing-adjacent content.
Adjacent / language-aware events worth knowing
These are not "general SE" but show up on every senior dev's radar and are useful for date-planning around the picks above:
- JavaZone (Sep 2-3, Oslo) — community-driven Java conference, 2,000+ attendees [21].
- Spring I/O (Apr 13-15, Barcelona) — 1,200+ Spring practitioners; Spring Boot 4 / Framework 7 / Spring AI are 2026's headline content [23].
- DDD Europe (Jun 8-12, Antwerp) — strategic design, event-driven architecture, socio-technical systems [20].
- Code BEAM Europe (Oct 21-22, Haarlem) — Erlang / Elixir / Gleam [24].
- Voxxed Days — Devoxx-affiliated single-day events across Europe (Ticino Feb 6, Zürich Mar 24, Bucharest Apr 28-29, plus Amsterdam, CERN, Romania) [26]. Cheap and local — useful filler when you can't fly to a flagship.
How to choose: three rules of thumb
- One flagship + one regional per year. Pair QCon London or GOTO Copenhagen with Craft, Øredev or a Voxxed Day near you. That's ~6-9 days off and €1.5-3k all-in.
- Optimise for hallway track over keynotes. Mid-size events (Craft, GOTO, Devoxx) have higher speaker accessibility than QCon or WeAreDevelopers [25].
- FOSDEM is always worth it — €0 + a Eurostar ticket. Even if you only catch 4 talks and a few hallway conversations, the ROI is uncatchable elsewhere [18].