Tech Events by Amsterdam Java User Group

with Simon Schrottner (Engineer, Flagsmith) · Zeljko Kozina (Engineer, Chronomill)

Two talks at Flagsmith's Plantage Kerklaan office, hosted by the Amsterdam Java User Group. Simon Schrottner of Flagsmith covers feature flags once the easy part is over: several languages to support, targeted evaluation, vendor lock-in and retiring dead flags, and how OpenFeature's vendor-agnostic SDKs handle them. Zeljko Kozina of Chronomill follows with wrapping an ageing Java service -- dozens of REST endpoints, a SOAP relic, session auth, nobody left who understands it -- as MCP tools so AI agents can call it without a rewrite. Free, 18:00 to 21:00. The listing is on waitlist. The group takes speaker proposals by email for later editions. Why go: the MCP-over-legacy-Java talk is the problem most enterprise teams are about to hit, and it is rare to hear it addressed without a rewrite pitch attached. Best for Java and platform engineers and architects carrying old services.

with Ricky van Rijn (Engineer, MetaFactory) · Makan Sepehrifar (, Productboard) · Ana-Maria Mihalceanu (Developer Advocate, Oracle)

The Amsterdam Java User Group's November meetup, hosted at MetaFactory near Westerpark, with three talks and the usual food, drinks and networking from 18:00. Ricky van Rijn (MetaFactory) on building an in-house AI agent orchestrator with Embabel, Skills and spec files, and how a visual dashboard for agents and tasks reshaped who does what on the team. Makan Sepehrifar (Productboard) on "Capability Mesh", an architecture that coordinates agents by capability rather than endpoint, carrying the service-mesh ideas of discoverability and observability into the agentic era. Ana-Maria Mihalceanu (Oracle) on readying Java cryptography for the quantum era, with a hands-on look at post-quantum hybrid key exchange in TLS 1.3. Free, register through Meetup. Why go: one of the city's longest-running and best-attended JVM communities, and this edition lands squarely on the agentic-AI problems Java teams are hitting in production. Best for backend and platform engineers working on the JVM.

The Amsterdam Java User Group's regular evening meetup, hosted this edition at Atlassian's office on Singel. 18:00 to 21:00, free to attend. The programme has not been announced; the group takes speaker proposals by email up to shortly before the date.

The Amsterdam Java User Group's autumn meetup, hosted in ING's Cedar building on Bijlmerdreef: four talks on security culture, AI on the JVM and keeping language models alive in production. Doors and food 17:30, talks from 18:00. Sarah Gruneisen on when silence becomes a security vulnerability, built around a five-layer model that starts with human safety rather than tooling; Zoran Sevarac on AI in Java for the financial industry; Hossein Kazemi on building durable AI workflows for regulated work; Iudzhin Uord on an LLM pipeline that survived two years in production. Free. Why go: four substantial talks is a long programme for a user group, and three of them are about running this in regulated production rather than prototyping it. Best for JVM engineers and platform teams in finance.

The Amsterdam Java User Group's October session, hosted in Mollie's canal-house engineering office. Two talks on JVM practice from engineers who run it at payment-scale, then pizza and drinks.

A hands-on OpenTelemetry workshop hosted at Dash0: instrument a JVM service properly, get traces and metrics flowing, and see what good observability actually costs to run. Bring a laptop.

Amsterdam JUG at Picnic's engineering HQ: JVM talks from a team running one of the country's larger Java estates, followed by food and drinks. Free, and consistently one of the better-attended developer evenings in the city.

An AGNTCon pre-day session hosted at Adyen and co-run with the Dutch Cloud Native and AI security communities: what agentic AI looks like once it is actually in production — tool calls, failure modes and securing what the agents can reach.

The Amsterdam Java User Group meets at IBM's Innovation Center, hosted jointly with Confluent. Expect JVM and streaming-platform talks with a practitioner slant and a long informal half at the end — the JUG is one of the more consistent technical communities in the city.

with David Veen (Speaker, Amsterdam JUG)

The Amsterdam Java User Group returns, hosted by BeFrank at De Entree in Zuidoost. Doors and food from 17:00, with the first talk — David Veen on why teams must take ownership of technical debt rather than treating it as someone else's backlog — followed by a second session. A long-established JVM community with a practitioner audience: platform engineers, backend developers and tech leads from the city's larger engineering organisations.