Software Development, Machine Learning and other stuff.https://liashchynskyi.net/en-ushttps://liashchynskyi.net/posts/nas-grid-random-genetic/https://liashchynskyi.net/posts/nas-grid-random-genetic/In 2019 we ran three ordinary search algorithms against the problem of designing a convolutional network and timed them. It turned into by far the most cited thing I've written — which says something about what people actually need from a paper.Wed, 12 Aug 2026 10:00:00 GMTmachine-learningneural-networksnasgenetic-algorithmoptimisationhttps://liashchynskyi.net/posts/engineer-vs-ai/https://liashchynskyi.net/posts/engineer-vs-ai/I resisted Cursor when my team adopted it, because I liked writing code by hand. Then I understood what had actually changed — and it wasn't the tooling.Wed, 12 Aug 2026 09:00:00 GMTaiengineering-practicecareercursorhttps://liashchynskyi.net/posts/mlops-for-clinical-machine-learning/https://liashchynskyi.net/posts/mlops-for-clinical-machine-learning/Most MLOps advice assumes you can ship fast, roll back, and A/B test in production. None of that holds when the model's output informs a cancer diagnosis. Notes from several years of research on biomedical image pipelines.Tue, 11 Aug 2026 09:19:18 GMTmlopsmachine-learningneural-networksdockerci-cdhttps://liashchynskyi.net/posts/from-gatsby-to-astro/https://liashchynskyi.net/posts/from-gatsby-to-astro/I rewrote this blog from Gatsby v2 to Astro 7 — keeping every URL, dropping 1676 dependencies, and shipping one bug straight to production. Here are the parts the migration guides don't mention.Tue, 11 Aug 2026 08:40:00 GMTastrogatsbytypescriptstatic-sitemigrationhttps://liashchynskyi.net/posts/mastering-distributed-locks-redlock-mutexes-in-multi-server-setup/https://liashchynskyi.net/posts/mastering-distributed-locks-redlock-mutexes-in-multi-server-setup/This blog post delves into the advanced implementation of Redlock mutexes in distributed systems, exploring their crucial role in ensuring data consistency and preventing race conditions in multi-server environments.Thu, 07 Dec 2023 11:44:48 GMTlockredisredlockmutexmulti-serverhttps://liashchynskyi.net/posts/nestjs-codex-auxiliaries-for-crud-using-mongoose-with-transactions-support/https://liashchynskyi.net/posts/nestjs-codex-auxiliaries-for-crud-using-mongoose-with-transactions-support/Repository provides a robust CRUD service using NestJS and Mongoose, designed to simplify the development of database interactions with built-in transaction support via Async Local Storage.Fri, 27 Oct 2023 12:44:24 GMTnestjsmongoosecrudasync-local-storagetransactionshttps://liashchynskyi.net/posts/machine-learning-intro-demystified/https://liashchynskyi.net/posts/machine-learning-intro-demystified/Overview of the basic concepts of machine learning and artificial intelligence.Fri, 21 Jul 2023 09:09:17 GMTmachine-learningneural-networkshttps://liashchynskyi.net/posts/class-method-locking-mechanisms-in-multi-server-setup/https://liashchynskyi.net/posts/class-method-locking-mechanisms-in-multi-server-setup/We’ll learn how to use synchronisation mechanisms such as mutex and lock in order to execute desired class method only once in multi-server setup.Thu, 25 May 2023 21:04:44 GMTmutexlocksemaphorerediscronoopclassesreplicashttps://liashchynskyi.net/posts/exceljs-merge-csv-or-xlsx-files-into-one/https://liashchynskyi.net/posts/exceljs-merge-csv-or-xlsx-files-into-one/This short post is about to explain how to easily merge two or more CSV or XLSX files with the same structure into one using ExcelJS.Fri, 28 Apr 2023 08:21:01 GMTexceljsnodejstypescripthttps://liashchynskyi.net/posts/nestjs-process-high-load-tasks-using-queues/https://liashchynskyi.net/posts/nestjs-process-high-load-tasks-using-queues/I'll teach you how to use Queues to process tasks that require a lot of computing time.Mon, 01 Aug 2022 21:09:05 GMTnestjshigh-loadqueuebullhttps://liashchynskyi.net/posts/nestjs-webhook-transmitter/https://liashchynskyi.net/posts/nestjs-webhook-transmitter/What if a 3rd-service accepts only one webhook URL? In that case we can transmit webhook event to any other endpoint.Tue, 28 Jun 2022 07:23:09 GMTnestjsaxioswebhookhttps://liashchynskyi.net/posts/nestjs-custom-relationship-validator/https://liashchynskyi.net/posts/nestjs-custom-relationship-validator/Build custom class-validator decorator in NestJS to ensure that provided ID in any DTO exists in Mongo database. Sun, 26 Jun 2022 16:06:23 GMTnestjstypescriptmongomongooseclass-validatorhttps://liashchynskyi.net/posts/cron-jobs-in-multi-server-setup/https://liashchynskyi.net/posts/cron-jobs-in-multi-server-setup/The article is about how to manage cron jobs in multi-server setupTue, 02 Nov 2021 13:36:49 GMTawslambdaeventbridgehttps://liashchynskyi.net/posts/syncing-postgresql-tables-with-elasticsearch/https://liashchynskyi.net/posts/syncing-postgresql-tables-with-elasticsearch/Let's talk about how to sync data between PostgreSQL and ElasticSearch easily (or not).Sat, 07 Aug 2021 18:53:04 GMTpostgresqlelasticsearchdockerredishttps://liashchynskyi.net/posts/connect-stripe-to-your-application/https://liashchynskyi.net/posts/connect-stripe-to-your-application/Today I want to share with you some of my thoughts about integrating Stripe into a web application. Thu, 17 Jun 2021 17:05:09 GMTstripepaymentsjavascripthttps://liashchynskyi.net/posts/simple-neural-network-using-javascript/https://liashchynskyi.net/posts/simple-neural-network-using-javascript/Today, I am going to tell you how to build a simple neural network with JavaScript without using any AI frameworks.Fri, 07 May 2021 08:47:44 GMTneural-networksjavascript