toptal.com
Contact us: +1.888.867.7001
Igor Ináš, Software Developer in Prešov, Slovakia
Igor Ináš

Software Developer in Prešov, Slovakia

Member since November 5, 2018
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.
Igor is now available for hire
Hire Igor

Portfolio

Experience

Location

Prešov, Slovakia

Availability

Part-time

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.

Employment

  • Senior Full-Stack Developer

    2020 - 2021
    Yara
    • 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, AWS, Amazon Web Services (AWS), Amazon Cognito, Amazon CloudFront CDN, Amazon S3 (AWS S3), AWS Route 53, AWS IAM, Kubernetes, JVM, Amazon Cognito User Pools, SQL, Full-stack, APIs, Microservices, Test-driven Development (TDD), RESTful APIs, RESTful Development, REST, Unit Testing, Documentation, Algorithms, JavaScript

  • Senior Full-stack Developer

    2020 - 2020
    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, RESTful APIs, RESTful Development, REST, Documentation, Algorithms, JavaScript

  • Web and Back-Office Developer

    2019 - 2020
    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, RESTful APIs, RESTful Development, REST, JavaScript

  • Kotlin Back-end Team Lead

    2019 - 2020
    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), RESTful APIs, RESTful Development, REST, Unit Testing, Documentation, Finance

  • Java Software Engineer

    2015 - 2018
    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

  • PHP Software Engineer

    2014 - 2018
    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

  • Java Software Engineer

    2010 - 2014
    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

  • Java Developer

    2007 - 2009
    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

  • Java Developer

    2004 - 2006
    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

  • PHP developer

    2004 - 2004
    TURKTICARET.NET A.Ş.
    • 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

Experience

  • QuasarGaming

    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.

  • AMS-WEB
    https://www.finamis.com/products/ams-web

    Developed software for investment banking, portfolio management.

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

  • Injury Loans
    https://brisbanecapital.com.au/

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

Skills

  • Languages

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

  • Frameworks

    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

  • Libraries/APIs

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

  • Tools

    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

  • Paradigms

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

  • Platforms

    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

  • Storage

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

  • Other

    Kubernetes Operations (Kops), RESTful APIs, 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, AWS, Springbot, DocumentDB, Integration Testing, JSON REST APIs, Project Lombok, Apollo Server, AWS Route 53, Scraping

Education

  • Master's Degree in Computer Science
    2000 - 2006
    Comenius University - Bratislava, Slovakia

Certifications

  • JSNSD: OpenJS Node.js Services Developer
    JANUARY 2021 - JANUARY 2024
    The Linux Foundation (LF-bu4q3nie69)
  • Node.js Application Developer
    DECEMBER 2020 - DECEMBER 2023
    The Linux Foundation (LF-jo4gaje0f5)
  • Certified Kubernetes Application Developer
    SEPTEMBER 2020 - SEPTEMBER 2023
    The Linux Foundation (LF-4ane2v4k8b)
  • Docker, Docker Swarm, Kubernetes Course
    DECEMBER 2019 - PRESENT
    Kodekloud (https://kodekloud.com)
  • Functional Programming Principles in Scala
    AUGUST 2016 - PRESENT
    Coursera (GSU8J25MK55B)
  • Programming Languages
    DECEMBER 2013 - PRESENT
    Coursera
  • Principles of Reactive Programming
    DECEMBER 2013 - PRESENT
    Coursera

To view more profiles

Join Toptal
Share it with others
Hire the top 3% of freelance developers TM