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On October 16-18, we participated in NixCon 2020. Here's the details of our participation.

Serokell at NixCon 2020

On October 16-18, we participated in NixCon 2020. 

NixCon is an annual conference for contributors and users of [Nix](https://serokell.io/blog/what-is-nix) and NixOS. 

It’s an event we keep participating in every year, [including the previous one](https://serokell.io/blog/serokell-nixcon2019). This year, due to the COVID crisis, it was done remotely. 

One of our employees, Alexander Bantyev, participated with a talk on Nix flakes in production, a thing we have been working for some time now. 

If you’re interested, here’s the talk. You can also see all the other talks of the event on their YouTube channel. 

<iframe width="560" height="315" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" data-src="https://www.youtube.com/embed/7sQa04olUA0?start=9117"></iframe>

Serokell Ranked in Top 100 Fastest-Growing Companies in 2021 by Clutch

Serokell has recently been ranked among the top 100 fastest-growing companies in the world by absolute revenue growth on the Clutch platform.

Serokell has recently been ranked among the top 100 fastest-growing companies in the world by absolute revenue growth on the [Clutch](https://clutch.co/) platform. 

Clutch is an online aggregator that conducts research and regularly publishes lists of top B2B companies in various domains. They provide a data-driven field guide to making business decisions by doing independent research and interviewing real clients. 

For more details, read the full [press release](https://clutch.co/press-releases/special-report-recognizes-top-b2b-service-providers-sustained-fast-growth-2021).

Daniel Rogozin's Paper Released in the Journal of Logic and Computation

Recently, a paper of one of our employees was released in the Journal of Logic and Computation. Read more details about the paper in this article.

D.Rogozin's Paper Released in Journal of Logic and Computation

Last year, Daniel Rogozin participated in a conference called Logical Foundations of Computer Science (Miami, USA, 2020). The contribution was the conference paper and lecture on the computational interpretation of some intuitionistic modal logics. [For more info, check this brief report about the conference](https://serokell.io/blog/lcfs-2020).

The extended paper has been recently released in the Journal of Logic and Computation (Oxford University Press). [The previous article](https://link.springer.com/chapter/10.1007/978-3-030-36755-8_15) was about questions related to syntax. In other words, Daniel was considering the modal typed lambda calculus based on the curious system of intuitionistic modal logic where he proved such properties as confluence and strong normalization.

The extended paper covers a broader class of topics. In addition to syntax, Daniel also proposed semantic analysis of those intuitionistic modal logics. In this paper, he proved that the obtained modal lambda calculus is complete with respect to cartesian closed categories equipped with coalgebras obtained from the monoidal endofunctor. That provides essential categorical intuition for evaluation in this type theory.

Additionally, he analyzed a class of logics by means of Kripke-Joyal semantics. This kind of semantics arose from topos theory and generalisation of the underlying topological notions proposed by Grothendieck. The modalities might be interpreted as prenuclear operators used in point-free topology. This version of topology studies topological spaces as lattices of open neighbourhoods without mentioning geometric points. As Newton said: “if I have seen further, it is by standing on the shoulders of Giants”. This aphorism illustrates the paper since this part of the article develops [Robert Goldblatt's ideas](https://academic.oup.com/logcom/article-abstract/21/6/1035/945244).

The paper [is available online](https://academic.oup.com/logcom/advance-article-abstract/doi/10.1093/logcom/exaa082/6049830), and it is to appear in the special issue of the Journal of Logic and Computation prepared by Sergei Artemov (City University of New York) and Anil Nerode (Cornell University).

#SerokellChat on April 28th!

Serokell will be hosting its first-ever Twitter chat on Tuesday, 28th, at 2 PM GMT.

Serokell will be hosting its first-ever Twitter chat on 28th April at 2 PM GMT. 

Our first special guest will be Serokell CTO Kirill Elagin, answering questions about the benefits of Haskell and how to grow as a Haskeller. If you are in the beginning or middle of your Haskell journey, this is an excellent opportunity to ask questions on things you should master to become a top-tier Haskell developer (and land a job at Serokell 😉).

![Twitter chat](/files/0n/0nt6pk7a.222_(2).jpg " ")

## What is a Twitter chat? 

It’s quite simple. Join us at the [#SerokellChat](https://twitter.com/search?q=%23serokellchat) hashtag next Tuesday from 2 PM–3 PM GMT, and participate in a discussion about Haskell with other Haskell enthusiasts and Serokell employees that work on actual production grade Haskell code. 

We will post 6 questions to start off the discussion, and you are welcome to express your opinion (which we highly value!) on these topics and discuss them with our special guest. 

Book the time in your calendars, follow us on [Twitter](https://twitter.com/serokell), and see you at #SerokellChat!

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Denis Oleynikov

Pavel Golovin

Mika Logan

Constantine Ter-Matevosian

Alexey Danilevsky

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Roman Melnikov

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Ping Chen

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test1

Domagoj Cerjan

Ellina Poponnikova

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Aleksandr Pakulev

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