Lambda Days
10th-anniversary edition! Let’s celebrate together this one-of-a-kind experience in the functional world.
5-6 June 2023
Kraków | Poland

For nearly a decade, Lambda Days has brought the functional programming worlds of academia and industry together. The collision of practical application and research has offered an exciting fresh approach, regardless of your level of expertise. This year, we’re celebrating our 10th anniversary and we want to make it special.

Whether you’re new to Lambda Days or you are one of the many friendly faces we see regularly at our events, we look forward to celebrating with you.

Come to beautiful, sunny Krakow for Lambda Days to find out what is possible with functional programming - explore the latest in battle-tested Scala, Erlang and Haskell, experience the energy that F# and Elixir bring to the table, connect with the innovators working with Elm, Luna and Ocaml and see what will come next!

Why is it worth attending Lambda Days? Learn by watching the video invitation from Michał Ślaski, the co-creator of Lambda Days and Keynote speaker.

Some of the highlights this year:

  • If you would like to learn a new approach to programming and delivering distributed systems, don't miss the presentation about Unison, which introduces a new perspective by combining effect systems and abilities.
  • Building a system is only the first step to its success, the next one is making sure it will stay alive. Concurrency and the actor model can help with load testing a system and making sure the SLAs are met.
  • Grasp how to make a safe and stable continuous deployment pipeline with highly distributed and stateful services - a battle story and lessons learnt talk.
  • Local-first software is getting more and more traction. Get to know more about it and see how functional programming helps with this new paradigm in a talk on ElectricSQL.
  • Functional programming can be seen in so many areas of the IT space. If you ever wondered how FP can be used with Postgres, now you can learn about TimescaleDB and how it helps build functional pipelines. 
  • Interested in Blockchain?  Watch a case study from which we will learn what helped build a successful, real-time and distributed blockchain network in Haskell that helped save millions of dollars of wasted effort.



Still a student? Get a special in-person ticket for 550PLN (+ VAT and fees) Contact us regarding discounts and volunteering options.

Also: dear Lambda Ladies - we can't get enough of you!

Ask your companies if they want to pay your fee.

For each Lambda Lady in a party, everyone gets 10%* off the regular price, adding up to even 50% off the entire order.

* Total discount cannot go over 50%, the offer applies to invoices issued for group reservations per order (the company receives a discount only for a single order, not for the potential following purchases).

Discounts only apply to full-priced tickets. Contact us directly for details.


As always we’re doing our best to make sure our conference is as diverse and awesome as the community we serve.

Thanks to the support from Standard Chartered we can distribute 5 tickets among participants from groups underrepresented in IT.

Apply to get yours!

First deadline: 28/04/2023 (recipients chosen)

Second deadline: 08/05/2023 (if recipients do not confirm, tickets are redistributed)

Become a sponsor!

We need support from the community to make Lambda Days the best event it can possibly be. In return, we offer sponsors the opportunity to showcase technology and hire new talent. Sponsorship will also align your company with cutting-edge technology, engage and raise brand awareness with over 400 functional programming professionals. Explore our sponsorship possibilities and receive our brochure by sending us an email.





Are you interested in presenting your thoughts on the subject of functional programming? Submit your presentation!

As of now we have identified the followig areas our audience would love to hear about:

  • Functional languages
  • Type Theory
  • Testing & Verification
  • Software and system design
  • Reactive Programming
  • Web programming
  • Computation in functional technologies
  • Applications and case studies

Is your presentation slightly outside that scope? Amaze and inspire us with your submission!

We’re happy to support candidates from under-represented groups in the software development community.

If you have not spoken at conferences before or need help in preparing, our programme committee members are happy to mentor and assist you with their feedback in the planning and delivery stages of your talk.

We’re also accepting talks for our Research Track - share your theoretical work with a large, diverse audience of scholars and practitioners. Additionally, you will have the opportunity to have your paper published in Computer Science (indexed in ESCI WoS and SCOPUS) journal. Just mark the correct field on the form to let us know if you are interested in having your work submitted for the journal.

The first round of reviews will take place in December. The second round in January can be cancelled if we receive enough submissions in the first round.

DEADLINES: first selection: 11/12/2022, second selection: 15/01/2023

Programme committee

John Hughes

Co-Designer Of Haskell And Quickcheck

Mary Sheeran

Professor at Chalmers

Simon Thompson

Computer science researcher @ University of Kent and ELTE

Katja Mordaunt

Tech-for-better dev & elm advocate

Łukasz Sowa

Managing Partner @ Iterators, Scala aficionado

Radek Szymczyszyn

Tech Lead @ Erlang Solutions

Mey Meisaron

Backend Developer at AppsFlyer

Michał Piotrowski

Tech Lead @ Erlang-Solutions

Mateusz Paciorek

Computer science researcher @ AGH University of Science and Technology



Krupnicza 33

31-123 Kraków



We managed to secure rooms at a special B&B rate per night for Lambda Days guests. Use the following links to get better prices at:

Grand Ascot Hotel ****
ul. Józefa Szujskiego 4 31-123 Kraków


Double room for single use: 510 PLN

Double room: 570 PLN
Breakfast is included.

To book and get an attendee discount contact and use the password "Lambda Days". 
Offer is valid till 29.05.2023

ul. Floriańska 28, 31-021 Kraków

-20% off the full price published on the hotel website

To check the attendee price and book contact using the password "Lambda Days"

ul. Św. Marka 20, 31-020 Kraków

-20% off the full price published on the hotel website

To check the attendee price and book contact using the password "Lambda Days"

ul. Ogrodowa 10, 31-155 Kraków


-20% off the full price published on the hotel website

To check the attendee price and book contact using the password "Lambda Days" or click on this link PURO Hotel Kraków Old Town


Why should you attend Lambda Days 2022? (a.k.a. "why can’t I just watch the talk videos online for free instead…?")

Firstly, not all the videos will be published right after the conference and will be kept exclusive to the attendees for a couple months.

The greatest asset of any conference is the community behind it. The Lambda Days crowd is inquisitive, open-minded, friendly and known to motivate each other to learn and innovate.

They ask the right questions, recommend the best talks, point to concepts to explore, inspire and challenge preconceptions at every turn.

Want to make the most of the content our speakers prepare? Experience it live with a crowd of people as excited about it as you are!








Want to join one of the most exciting IT conferences in Europe free of charge? Join our team as a volunteer!


To respond to your requests, we've added the minimalistic anniversary design to our e-shop with conference swag! You can now not only participate in Lambda Days 2023 but also order LD t-shirts (included in the ticket!), sweatshirts, mugs and many more items, from the comfort of your couch.

All items are ordered directly with Spreadshirt but are branded with the official Lambda Days branding. The store was created for our community but is a third-party supplier. Any issues with the items should be directed to the supplier and not Code Sync.

Code of Conduct

All attendees, speakers, sponsors and volunteers at our conference are required to agree with the following code of conduct. Organisers will enforce this code throughout the event. We are expecting cooperation from all participants to help ensuring a safe environment for everybody.

Our conference is dedicated to providing a harassment-free conference experience for everyone, regardless of gender, sexual orientation, disability, physical appearance, body size, race, or religion. We do not tolerate harassment of conference participants in any form. Sexual language and imagery is not appropriate for any conference space, including talks, workshops, parties, Twitter and other online media.

Please bring any concerns to the immediate attention of the event staff, or contact our Event Coordinator, Barbara Trojecka using our contact form. We thank our attendees for their help in keeping the event welcoming, respectful, and friendly to all participants.