The agentic AI development conference by Callstack: two days in Warsaw on vibe coding, multi-agent systems and the shift from human-driven to autonomous code.
Agent Conf is a two-day conference focused on agentic AI development, held in Warsaw and organised by Callstack, the Warsaw software house behind React Native EU and its successor React Universe Conf. The event addresses the shift from conventional human-written code to AI-assisted and autonomous development workflows. Four tracks cover vibe coding, agentic engineering fundamentals, orchestration and multi-agent systems, and enterprise adoption with case studies. The 2026 edition takes place at Crowne Plaza Warsaw The HUB on 17 and 18 September and sits within the Developer AI circuit tracked by Events Index.
The four tracks are structured to serve both practitioners beginning to adopt agentic development and engineers already building production multi-agent systems:
The call for speakers ran on Sessionize and closed on 20 June 2026, prioritising original talks from practitioners actively building agent systems. Submission categories included agent design and architecture patterns, advanced prompting, multi-agent orchestration, tools and infrastructure, and production case studies. Talks are structured as 20-minute sessions.
The 2026 lineup as published on the official site mixes AI-tooling founders, framework maintainers and platform engineers from companies running agents in production. Confirmed speakers include:
The official site notes more speakers are still to be announced. The presence of engineers from Meta, Booking.com, eBay, Grafana Labs and Allegro alongside AI-tooling founders reflects the event's intended split between frontier tooling and production-tested practice.
Callstack is a Warsaw-based software consultancy known for its work on React Native and its organisation of React Native EU, first held in 2017, which later ran as React Universe Conf. Agent Conf is a new vertical from the same team, moving the community-conference model from the React and mobile audience to the agentic development space and relocating it to Warsaw's business district. The organiser cites more than 20,000 attendees across its events to date, a figure that spans its full conference history rather than Agent Conf alone.
The continuity matters for what the event is likely to be in practice: Callstack runs developer conferences built around hands-on engineering rather than vendor keynotes, and Agent Conf inherits that format. For attendees weighing where agentic engineering sits on the wider calendar, it runs alongside events such as Agentic Engineering Days Zurich and the broader AI Engineer Europe programme within the Developer AI circuit.
The 2026 edition is held at Crowne Plaza Warsaw The HUB, at 2 rondo Ignacego Daszyńskiego in Warsaw's central business district. The location places the conference among the office towers of the Wola district, a short metro ride from the old town and roughly 20 minutes by rail from Warsaw Chopin Airport (WAW). A single-venue, single-city setup keeps the event compact rather than spread across multiple sites, consistent with its stated framing as a focused, hands-on conference for around 500 engineers.
Agent Conf is a first-edition developer conference rather than an established fixture, so independent editorial coverage is limited at this stage. What exists is concentrated in the React and JavaScript community channels that overlap with Callstack's audience:
No independent press reviews, attendance audits or accreditation figures have been published as of this verification, which is expected for an inaugural edition. Any attendance or scale claims here are organiser figures, labelled as such, not third-party counts.
The event targets software developers, AI engineers and engineering leaders who are actively building with or evaluating agentic AI systems. The programme spans beginner-to-production topics across the four tracks, from AI-assisted coding workflows through to multi-agent orchestration in production.
Vibe coding refers to AI-assisted development workflows where developers describe intent to an AI system and iterate on generated code rather than writing every line manually. The term gained traction across 2025 and 2026 as language model coding assistants became standard tools. It is the entry-level track at Agent Conf, positioned before the harder engineering topics.
It is run by the same team at Callstack. React Native EU launched in 2017 and later ran as React Universe Conf; Agent Conf applies the same hands-on, community-conference format to agentic development and moves the event to Warsaw. Attendees familiar with Callstack's React events should expect a similar engineering-first structure rather than a vendor showcase.
No. The CFP ran on Sessionize and closed on 20 June 2026. The published lineup continues to expand, with the official site noting that more speakers are to be announced ahead of the September dates.
Agent Conf is the agentic development conference by Callstack, the React Native EU team, positioning Warsaw as the European venue for the shift from human-driven code to autonomous systems. The four-track structure is well-calibrated to the current state of the field: most practitioners are somewhere between first experiments with AI coding assistants and the harder engineering problems of production multi-agent orchestration. The speaker mix, AI-tooling founders alongside platform engineers from Meta, Booking.com, eBay and Grafana Labs, signals an event trying to bridge frontier tools and production reality rather than pick one. Warsaw gives Central European developers a proximate option for a topic that has, until now, concentrated at US conferences, and slots into the Developer AI circuit next to Agentic Engineering Days Zurich and React Advanced 2026.
Registration is handled through the official site and a linked Eventbrite listing. As of this verification the organiser does not publish a static price table on a public page; tiers and current prices are shown at checkout via agent.sh and the Eventbrite listing. A 10% discount code was circulated through the This Week In React newsletter placement. Early-bird deadlines, group rates and any student pricing are not publicly disclosed as of verification. Prospective attendees should confirm the live price at checkout before booking, and can cross-reference the wider Developer AI circuit and the upcoming EMEA events calendar when planning travel.
Warsaw Chopin Airport (WAW) has direct connections from most major European cities, with Warsaw Modlin (WMI) as a secondary low-cost option. The Crowne Plaza Warsaw The HUB venue sits in the central Wola business district, roughly 20 minutes from Chopin Airport by rail and a short metro ride from the city centre.
No online or hybrid attendance option was announced as of verification. Agent Conf is presented as an in-person, single-venue event. Check agent.sh for any change to that ahead of the dates.
No. The call for speakers closed on 20 June 2026 via Sessionize. The lineup is still being finalised, but new submissions are no longer accepted for the 2026 edition.
The official site agent.sh carries the speaker roster, venue and track structure, and the linked Eventbrite listing handles ticketing. Callstack's event page mirrors the core details. Events Index tracks the event within the Developer AI circuit and the upcoming EMEA events calendar.
| Official website | https://www.agent.sh/ |
| Tickets | https://www.agent.sh/tickets |
| Organiser event page | https://www.callstack.com/events/agent-conf |
| CFP (Sessionize, closed) | https://sessionize.com/agent-conf-2026 |
| Developer AI circuit (Events Index) | /developer-ai.html |
| Upcoming EMEA events (Events Index) | /upcoming.html |