architecture - Sergii Demianchuk Blog

Part 1: Defending Against Botnets: Why IP Rate Limiting Fails and How to Implement JA4 Fingerprinting on AWS

3 Min Read

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If you have ever tried to stop a sophisticated scraper or a DDoS attack using standard AWS WAF rate limits, you likely ran into the wall with bigboard: IP rotation. Traditionally, rate-based rules are simple. The WAF counts requests from a specific key (usually an IP address) in a rolling 5-minute window. If that IP crosses a threshold, the WAF blocks it. This works great for sloppy scripts. But...

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Cyber Security of Web Applications in one pill

By sergii-demianchuk

In Cyber Security, Popular

1 Min Read

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Hi, everybody That is a general wrapper topic, rather then article by itself, where I am going to aggregate different posts related with cyber security for web applications. Below you may different links (I will new articles gradually) that, which I hope, would be useful. Cyber security Articles Application and AWS CloudWatch as security monitoring tools Database encryption at PHP Symfony Web App...

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OpenSearch ML reranking with AWS Personalize Service

By sergii-demianchuk

In DevOps, ElasticSearch, ML

7 Min Read

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Hi, Recently I had an opportunity to make a practical research around AWS Personalize Service. My main goal was to test Personalized-Ranking recipe and to verify how it works in pair with rather fresh AWS feature – OpenSearch Personalize ranking plugin. I had to verify if is possible to bring our existing search system at new level with ML personalizing features. The main thing that I was...

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ElasticSearch as you have never known it before – EXCLUSIVE CONTENT

By sergii-demianchuk

In ElasticSearch

3 Min Read

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Udemy Coupons: ELASTICSALES11 – active 02.11.2025-02.12.2025; in case coupons are already expired, please check that page regularly – new one will appear soon; Here I want to present an introduction to my on-line course: “Elasticsearch as you have never known it before”. At that course I am sharing my production experience with using ElasticSearch for building advanced search systems...

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AWS devops: ElasticSearch at AWS with terraform and ansible

By sergii-demianchuk

In Autoscaling, DevOps, ElasticSearch, Terraform

4 Min Read

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Udemy Coupon: DEVOPSSALES11 – active 02.11.2025-02.12.2025 in case coupons are already expired, please check that page regularly – new one will appear soon; ENROLL AT AWS devops course Are you interested in docker orchestration? Would you like to uncover deep insights and pitfalls of AWS? Do you want to see the real power of Terraform and Ansible at real commercial examples? Or maybe you...

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Java ElasticSearch

By sergii-demianchuk

In ElasticSearch, Java, Java Spring Boot ElasticSearch tutorial

4 Min Read

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Hi, Current article is the introduction to the practice series of articles devoted to theme “How to work with ElasticSearch using Java and Spring Boot Framework”. You may treat it as Spring Boot ElasticSearch tutorial though you will get also additional deep knowledge at how to build search microservice from scratch, how to use programming patterns at real examples. So, lets start...

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ElasticSearch Python Flask

By sergii-demianchuk

In ElasticSearch, Python, Python Flask ElasticSearch tutorial

4 Min Read

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Hi, Current article is the introduction to the practice series of articles devoted to theme “How to work with ElasticSearch using Python and Flask framework”. You may treat it as Python ElasticSearch tutorial though you will get also additional deep knowledge at how to build search microservice from scratch, how to use programming patterns at real examples. So, lets start from task...

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Symfony ElasticSearch

By sergii-demianchuk

In ElasticSearch, PHP, Symfony PHP ElasticSearch tutorial

4 Min Read

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Hi, Current article is the introduction to the practice series of articles devoted to theme “How to work with ElasticSearch using Symfony PHP framework”. You may treat it as Symfony ElasticSearch tutorial though you will get also additional deep knowledge at how to build search microservice from scratch, how to use programming patterns at real examples. So, lets start from task...

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Elasticsearch basics

By sergii-demianchuk

In ElasticSearch

2 Min Read

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Hi, that is a higher level post that will include different articles around Elasticsearch basics theme. Here I will try to discuss next aspects: elasticsearch data layer architecture; elasticsearch document oriented nature; how to work with elasticsearch using REST API and such tools as: curl package, elasticsearch head plugin, postman; how to validate and format JSON objects; base CRUD...

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