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Ihor Kosandyak

Company position : Lead Software Engineer | Expertise : Java, PropTech, Marketplaces, System integrations
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Java Applications: What You Should Know About Java

One day you reach a decision to take your business to a new level. So, building a custom app may be one of your business transformation strategy bricks. Or perhaps you are hunted by an idea to launch a startup, so you start cudgeling your brains over bringing your mental creation to a functional digital […]

Ihor Kosandyak

17 Jan, 2023 · 7 min read

Spring Cloud Gateway security with JWT

There is a clear understanding that everything that is exposed to the Internet should be secured. Especially when you create software and work with sensitive user data, such as emails, phone numbers, addresses, credit cards, etc. Here we will go through securing API Gateway with Json Web Tokens(JWT). As far as you probably know Spring […]

Ihor Kosandyak

26 Feb, 2021 · 4 min read

5 Ways To Improve Application Performance

It’s not that easy to create fast, easy, and smooth applications. You need to be aware of tons of cases that will happen to your app in the future as your users’ amount grow. Especially, this is true for IoT application development, which still remains a complex, time-consuming, and challenging activity despite much progress in […]

Ihor Kosandyak

9 Aug, 2019 · 4 min read

Spring Boot REST Internationalization

Have you ever faced with challenging task of providing service to your users in their native language? If so — then you may be interested in finding a good approach of doing this. This guide will show you how to add internationalization to your Spring Boot application in just a couple of straightforward steps. And […]

Ihor Kosandyak

29 Oct, 2018 · 4 min read

Spring Boot with Hazelcast

Have you ever faced with slow performance of your application? Have you ever thought of the way to boost your Spring app? If so — then this article is definitely for you. Here we will speak about using super powerful and leading in-memory data grid that may increase your app performance! So let’s jump into […]

Ihor Kosandyak

5 Sep, 2018 · 4 min read

Spring Boot + Caching

This topic will give you understanding of usage Spring Boot with Caching to increase your app performance significantly 🚀 ! Every one of you — if you already reading this article — faces or has faced with the problem of slow service. Why does it usually happen you would ask me? Well, there are lots of reasons […]

Ihor Kosandyak

10 Aug, 2018 · 5 min read

Spring Boot + GraphQL + MongoDB

If you read this article, then you’ve probably heard about GraphQL. If not, you may find this material too tech-specific. Perhaps, hiring a dedicated software development team to build API will work out to be a better way out for you. In case Spring Boot, GraphQL, and  MongoDB don’t awaken confusion, keep on reading to […]

Ihor Kosandyak

30 Nov, 2017 · 7 min read

Spring Boot + WebSockets + Angular 5

Hello guys! Here we will speak about how to set up Spring Boot project with Websocket messaging and Angular 5. As an output of this topic you will get small chat built with Spring Boot and Angular 5. Lets’s start First of all, we will set up Java project for this. The pom.xml file will […]

Ihor Kosandyak

10 Nov, 2017 · 4 min read

Spring Boot + PayPal + Angular 2

Hi guys! Nowadays, more often and often in different projects you have to handle and deal with different payment services, like Stripe, PayPal, Authorize.net, etc, to provide users with ability to purchase in your app, or make payouts to them. Here we will speak about how to add PayPal payment system to the Spring Boot […]

Ihor Kosandyak

8 Nov, 2017 · 6 min read

Microservices with Java. Quick Start. Part 2

Hello! In this part we will speak about communication between microservices, and will add an API Gateway to our project. If you missed the first part of this topic, you may find it here. When you build an application with microservice architecture, you will definitely have couple services running separately. Of course you will need them […]

Ihor Kosandyak

5 Nov, 2017 · 5 min read

Microservices with Java. Quick Start. Part 1

Hi everyone! In this article we will create the simple Spring Cloud Project ready to start and work! Day by day, often and often you can hear about microservices architecture. Everybody wants to create services that are independent from each other. And failure of the single service doesn’t lead to the whole application failure. Of course, microservices […]

Ihor Kosandyak

5 Nov, 2017 · 7 min read

Spring Boot Quick Start!

This is a short guide about how to start your first Spring Boot Application. Intro Hi all! This guide provides a sample of creating your application with Spring Boot! Spring Boot is the Java Enterprise Framework that makes it easy to create Spring powered applications that are stand-alone, production-ready and to create it with a minimum of efforts. At […]

Ihor Kosandyak

20 Mar, 2017 · 6 min read