📢 Call for Papers deadline: October 31, 2026
Last verified: October 30, 2026 · how we verify
Information aggregated automatically. Verify all dates, locations, and pricing on the official conference website before making arrangements.
Java Day Istanbul is a community-driven developer conference centred on the Java ecosystem, with a broad programme that also reaches into cloud, AI and software architecture. It is aimed at backend and JVM developers, architects, technology companies and startups in Turkey and beyond who want to follow where the platform and its surrounding practices are heading. The 2027 edition is a one-day, in-person event on 17 April at the Elite World Grand Istanbul Küçükyalı hotel in the Maltepe district of Istanbul. Talks are organised into tracks including Java language and platform, development practices, cloud native, data and infrastructure, agentic engineering and tooling, architecture and modernisation, security and compliance, and people and careers, alongside a lighter "Mind the Geek" track. The day also hosts the Tech Excellence & AI Awards. Attendees can follow updates on the language and frameworks such as Spring, learn how teams are modernising legacy systems and adopting AI-assisted engineering, and connect with the local open source community. With editions held each year, this Java conference in Istanbul has become a regular meeting point for the city's backend developers and an accessible entry into the wider European JVM scene.
Java Day Istanbul 2027 takes place April 17, 2027 in Istanbul, Turkey.
Java Day Istanbul 2027 is an in-person event.
The Call for Papers is open — submissions close on October 31, 2026.
Travel questions? See Good to know in the travel guide below.
Java Day Istanbul falls in mid-April, which locals will tell you is the single best week to be in the city: the Bosphorus tulip plantings are at full colour, the weather is warm without humidity, and the summer crowds have not yet arrived. Istanbul spans two continents, and a one-day conference leaves just enough margin to cross between them by ferry. The Java community here is large and long-established.
Two airports serve the city on opposite sides. Istanbul Airport (IST) is on the European side, linked to the centre by the M11 metro and Havaist coaches, taking around an hour. Sabiha Gokcen (SAW) sits on the Asian side, roughly 90 minutes from the European centre. Within the city, the Istanbulkart covers metro, tram, funicular, bus and the Bosphorus ferries on one card.
Skip the taxi queue — pre-book a fixed-price airport transfer with Welcome Pickups. Exploring beyond the city? compare rental cars on Localrent.
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Wi-Fi is widespread in cafes and hotels. Turkish regulations can restrict foreign handsets on local networks after a period of use, which makes an eSIM bought before travel the cleanest way to get reliable data for a short stay. Set up an eSIM with Airalo before you board and you're online the moment you land.
Hagia Sophia. Built as a sixth-century cathedral, converted to a mosque, run as a museum, and now a mosque again, with Byzantine mosaics surviving above the Islamic calligraphy. Visitor entry is ticketed and separated from prayer areas. Around an hour, and going early avoids both queues and the midday tour groups. Tickets on Tiqets →
Basilica Cistern. An underground Byzantine water reservoir beneath Sultanahmet, its brick vaults carried on 336 columns including two reused Medusa heads. The lighting and standing water make it unexpectedly atmospheric, and it is cool on a warm April afternoon. Forty-five minutes; timed tickets are advisable. Tickets on Tiqets →
Emirgan Park. The Bosphorus-side park that anchors the city's April tulip displays, planted in vast beds across the slopes with views over the strait. This is a genuinely seasonal attraction and mid-April is the peak. Two hours including the trip north; combine it with a ferry back down the Bosphorus.
Bosphorus ferry crossing. Public ferries between Eminonu, Karakoy and the Asian side at Kadikoy or Uskudar cost a normal transit fare and give the classic skyline view from the water. It is transport rather than a tour, which is exactly why it works. Twenty minutes each way, and Kadikoy is the better dinner destination.
Which airport should I fly into?
Istanbul Airport (IST) on the European side is closer to the historic centre and connected by the M11 metro. Sabiha Gokcen (SAW) is on the Asian side and adds substantial transfer time.
How do I pay for public transport?
Buy an Istanbulkart at any station kiosk and top it up. It works across metro, tram, funicular, buses and the public Bosphorus ferries.
What is the weather like in mid-April?
Warm and comfortable, typically in the high teens to low twenties Celsius, with occasional rain. It is one of the most pleasant months of the year here.
Travel notes written for Java Day Istanbul attendees. Links marked above are affiliate links — we may earn a commission at no cost to you. Verify schedules and opening hours on official websites before you travel.
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