Igor Ináš, Developer in Prešov, Slovakia

Igor Ináš

Software Developer

Prešov, Slovakia
Toptal Member Since
January 3, 2019

Igor has been a Java developer for over a decade. While in touch with the latest frameworks, he always puts emphasis on fundamental concepts and best practices in code writing first. He strives to write maintainable code and follows a strict separation of concerns. Duplicate or dead code is not an option. He follows a client-oriented approach, understanding that the client's success is his own success.

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Java, Spring, Springbot, MongoDB, DocumentDB, PostgreSQL, JUnit...
Heatcraft Refrigeration Products (via Toptal)
Java EE, Java, WebDAV, Microsoft Excel, Node.js, TypeScript, React, CSS...
Brisbane Capital (via Toptal)
Java EE, Java, Docker, MongoDB, Express.js, Node.js, Angular, MySQL, JSF...


Prešov, Slovakia



Preferred Environment

PHP, TypeScript, Node.js, Java, Kubernetes, Linux Mint, IntelliJ IDEA, Docker, Ubuntu, Windows

The most amazing...

...software I've created was an API performing thousands of micro financial transactions each second while being limited to only use PHP and simple MySQL.

Work Experience

2020 - 2021

Senior Full-Stack Developer

  • Built back-end REST and GraphQL APIs for the client's application that helps farmers manage farms, fields, fertilizers.
  • Created the supporting microservices, e.g., email notifications.
  • Developed Forest, Admin GUI panel, to be used by the customer support team.
  • Performed ad-hoc DevOps tasks in AWS, mainly Kubernetes and CircleCI.
  • Migrated parts of legacy SpringBoot code into multiple NestJS microservices.
Technologies: Java, Spring, Springbot, MongoDB, DocumentDB, PostgreSQL, JUnit, Integration Testing, JSON REST APIs, Mailchimp, Mandrill, Apache Kafka, Project Lombok, GraphQL, Apollo Server, TypeScript, NestJS, Flyway, Amazon Web Services (AWS), Amazon Cognito, Amazon CloudFront CDN, Amazon S3 (AWS S3), Amazon Route 53, AWS IAM, Kubernetes, JVM, Amazon Cognito User Pools, SQL, Full-stack, APIs, Microservices, Test-driven Development (TDD), REST APIs, RESTful Development, REST, Unit Testing, Documentation, Algorithms, JavaScript
2020 - 2020

Senior Full-stack Developer

Heatcraft Refrigeration Products (via Toptal)
  • Developed a new online catalog of refrigeration products.
  • Applied an initial prototype in React and integrated static HTML and CSS provided by UIX designers.
  • Implemented production version in DotCMS and Velocity, and developed a custom Java DotCMS plugin to support product catalog functionality.
  • Created custom Node.js scripts to aid the deployment of production artifacts: Velocity templates, Java plugin binaries, and product data.
  • Developed custom Node.js scripts for parsing Excel files containing product data and transforming them into production format.
Technologies: Java EE, Java, WebDAV, Microsoft Excel, Node.js, TypeScript, React, CSS, Velocify, DotCMS, Scraping, JVM, SQL, Full-stack, APIs, REST APIs, RESTful Development, REST, Documentation, Algorithms, JavaScript
2019 - 2020

Web and Back-Office Developer

Brisbane Capital (via Toptal)
  • Maintained and developed a back-office application for Injury Loans company.
  • Maintained and developed an online application portal.
  • Developed new Angular/Express website, integrated with back-office applications.
  • Delivered ad-hoc reports, customized standard reports.
  • Deployed all applications to docker containers, maintained application launch shell scripts.
Technologies: Java EE, Java, Docker, MongoDB, Express.js, Node.js, Angular, MySQL, JSF, Jakarta EE, JVM, SQL, Full-stack, APIs, REST APIs, RESTful Development, REST, JavaScript
2019 - 2020

Kotlin Back-end Team Lead

Virtual Bank at Standard Chartered Bank, Hong Kong (remote)
  • Created REST back-end endpoint to facilitate domestic payments.
  • Implemented multiple micro services, backed by Kafka asynchronous communication.
  • Ensured high unit test coverage and integration testing.
  • Served as the team lead and provided code reviews.
  • Integration with 3rd party bank and payment service APIs.
Technologies: Java EE, Java, Apache Kafka, JPA, Spring, Kotlin, JVM, SQL, APIs, Microservices, Test-driven Development (TDD), REST APIs, RESTful Development, REST, Unit Testing, Documentation, Finance
2015 - 2018

Java Software Engineer

Real Life Sciences, Inc.
  • Developed a high performance text parsing service.
  • Customized an existing desktop GUI of data anonymizer application.
  • Provided consultations related to building and integration of Java processes.
Technologies: Java EE, SWT, Apache Spark, Spring Boot, Java, JVM, SQL, Algorithms
2014 - 2018

PHP Software Engineer

V-Lottery Systems GmbH
  • Developed two online casino websites.
  • Inherited and reverse-engineered an old PHP project.
  • Performed major clean up, removed massive amount of duplicate code, introduced enterprise ready improvements.
  • Continuously deployed new features, while maintaining virtually zero downtime.
  • Developed and secured all features related to financial transactions.
  • Developed a high volume remote financial transaction API.
  • Established data retention procedures.
  • Performed code review and mentoring of junior developers.
Technologies: Akka, Scala, Docker, CentOS, Redis, jQuery, MySQL, Zend Framework, PHP, SQL, Full-stack, APIs, Documentation, Algorithms, Finance, JavaScript
2010 - 2014

Java Software Engineer

Swiss Re
  • Implemented a proprietary data store.
  • Implemented batch processing of financial data.
  • Migrated, improved, and consolidated existing COBOL solution to Java.
  • Created whole design and implemented from scratch.
  • Improved performance by continuous profiling.
  • Performed testing, release planning, and created documentation.
  • Improved end-user experience by introducing web and desktop GUI.
Technologies: Java EE, Java, IBM WebSphere, IBM Mainframe, IBM Db2, Swing, Hibernate, Enterprise Java Beans (EJB), Spring, JVM, SQL, Test-driven Development (TDD), Unit Testing, Documentation, Algorithms, Finance
2007 - 2009

Java Developer

FINAMIS s.r.o.
  • Developed private banking and financial portfolio management software.
  • Implemented business functionalities according to documentation.
  • Led development of GWT web client.
  • Maintained and improved an in-house build and deployment platform.
Technologies: Java EE, Java, IBM Rational, GWT, Swing, JSF, Hibernate, Oracle, Microsoft SQL Server, WebSphere, JBoss, Enterprise Java Beans (EJB), JVM, SQL, Full-stack, APIs, Test-driven Development (TDD), Unit Testing, Documentation, Algorithms, Finance, JavaScript
2004 - 2006

Java Developer

Siemens Enterprise Communications
  • Worked on-site at client (bank), performed analysis of internal systems.
  • Developed custom adapters for identity management solution.
  • Developed access to legacy systems, which did not expose any reasonable API.
  • Consulted and supported definitions of processes, roles and rules.
  • Created a custom billing solution for a telecommunication company.
  • Optimized performance of both new and existing solutions.
  • Developed management tools.
Technologies: Java EE, Java, Hibernate, PostgreSQL, Oracle, Swing, Berkeley DB, JMX, MQSeries, JMS, IBM Db2, JVM, SQL, Algorithms
2004 - 2004

PHP developer

  • Took an AIESEC working traineeship in a foreign software company.
  • Developed multiple web sites for small and middle sized companies.
  • Developed custom CMS for every website.
  • Provided English translations.
Technologies: XTemplate, HTML, MySQL, Apache, PHP, SQL, JavaScript



Online gambling casino website. I integrated the majority of payment methods, e.g. PayPal, Skrill, and others. I designed and implemented a high volume API for exchanging money between user's wallets and 3rd party game providers.

I refactored and reverse-engineered an old PHP solution, bringing it to higher standards, removed duplicate code, set up static code analysis.

Together with DB engineers, I tuned the performance of the database, fixed data model, established data replication and retention procedures.

I directly supported client and website operations.


Developed software for investment banking, portfolio management.

Introduced GWT to the technology stack, lead development of new web client (AMS-WEB).

Injury Loans

Web site and back-office for an injury loan provider company in Australia.



SQL, Java, PHP, Kotlin, CSS, TypeScript, HTML5, Scala, JavaScript, HTML, Ruby, Racket, ECMAScript (ES6), Groovy, GraphQL


JPA, Spring, Spring Boot, GWT, Spring JDBC, Zend Framework, Play Framework, Hibernate, Akka, Apache Spark, Ruby on Rails (RoR), Swing, JSF, Bootstrap, Grails, Spark, Express.js, Angular, NestJS, JUnit


JDBC, React, JMS, jQuery, Node.js, SWT, JMX, REST APIs, Vue


IntelliJ, Azure Kubernetes Service (AKS), Google Kubernetes Engine (GKE), Docker Compose, Jenkins, Jira, IntelliJ IDEA, IBM Rational, MQSeries, Apache, Docker Swarm, Microsoft Excel, Ansible, Amazon Cognito, Mailchimp, Flyway, Amazon CloudFront CDN, AWS IAM


Microservices, RESTful Development, REST, Unit Testing, Functional Programming, Test-driven Development (TDD), Microservices Architecture, Reactive Programming, Scrum


Jakarta EE, Docker, Java EE, Kubernetes, JVM, Apache Kafka, Linux, Windows, Heroku, Ubuntu, CentOS, IBM WebSphere, WebSphere, Oracle, DotCMS, Linux Mint, JBoss, LAMP, Amazon Web Services (AWS), Mandrill


MySQL, MongoDB, IBM Db2, Redis, Microsoft SQL Server, Berkeley DB, PostgreSQL, MSSQLCE, Oracle SQL, Amazon S3 (AWS S3)


Kubernetes Operations (Kops), APIs, Documentation, Algorithms, Message Queues, Ajax, CI/CD Pipelines, Full-stack, Finance, IBM Mainframe, XTemplate, Machine Learning, Reactive Streams, Velocify, WebDAV, Web App Security, Computer Science, Enterprise Java Beans (EJB), Amazon Cognito User Pools, Springbot, DocumentDB, Integration Testing, JSON REST APIs, Project Lombok, Apollo Server, Amazon Route 53, Scraping


2000 - 2006

Master's Degree in Computer Science

Comenius University - Bratislava, Slovakia



JSNSD: OpenJS Node.js Services Developer

The Linux Foundation (LF-bu4q3nie69)


Node.js Application Developer

The Linux Foundation (LF-jo4gaje0f5)


Certified Kubernetes Application Developer

The Linux Foundation (LF-4ane2v4k8b)


Docker, Docker Swarm, Kubernetes Course

Kodekloud (https://kodekloud.com)


Functional Programming Principles in Scala

Coursera (GSU8J25MK55B)


Programming Languages



Principles of Reactive Programming