Attila Fejér, Developer in Budapest, Hungary
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Attila Fejér

Verified Expert  in Engineering

Architectural Design Developer

Location
Budapest, Hungary
Toptal Member Since
October 16, 2019

Attila is a seasoned software engineer with several years of experience under his belt. He has expertise in the Spring Framework and the Java ecosystem and robust skills regarding front-end technologies, DevOps, architectural design, and object-oriented programming. Attila has led development teams ranging from 4 to 10 members, is dedicated to continuous growth, and has created and taught several development courses.

JavaHibernateJava EEJava 8SpringSpring BootJavaScriptSQLMySQLJUnitGitAssertJREST APIsTypeScriptApache MavenORMGoogle Compute Engine (GCE)JPAHazelcastLiquibase

Portfolio

IBM
Java, JavaScript, TypeScript, Spring, Docker, Angular, Architecture, Coaching...
CyClick Kft.
Liquibase, Bootstrap, JavaScript, Java EE, Java, MySQL, REST APIs, Java 8, SQL...
Apertus Nonprofit Kft.
NGINX, Hazelcast, Jenkins, MySQL, Spring, Java, REST APIs, JavaScript...

Experience

Java - 14 yearsJava EE - 12 yearsDesign Patterns - 9 yearsArchitectural Design - 8 yearsJPA 2 - 8 yearsSpring - 8 yearsAngular - 3 yearsDocker - 2 years

Availability

Full-time

Preferred Environment

Git, Visual Studio Code (VS Code), IntelliJ IDEA, Java, Spring Boot, JavaScript, Linux, Containers, REST APIs

The most amazing...

...performance improvement I've reached was decreasing a REST API's under-load response time from 90 seconds to 30 milliseconds using sophisticated caching.

Work Experience

Software Engineer

2020 - 2024
IBM
  • Designed and implemented highly scalable software products in a cloud environment.
  • Mentored, trained, and coached people and teams in applying software development best practices and adopting new internal tooling.
  • Led training programs that impacted 10,000+ developers.
Technologies: Java, JavaScript, TypeScript, Spring, Docker, Angular, Architecture, Coaching, Team Mentoring

Full-stack Developer

2019 - 2019
CyClick Kft.
  • Created an event organizing administrative module to an existing ERP system.
  • Ported various features from a Java Swing application to a web application.
  • Contributed to every part of the project, from requirements gathering to application deployment.
  • Introduced database change management using Liquibase.
  • Optimized the Jakarta EE server code performance on WildFly.
Technologies: Liquibase, Bootstrap, JavaScript, Java EE, Java, MySQL, REST APIs, Java 8, SQL, JUnit, Git, AssertJ, TypeScript, Linux

Lead Software Developer

2017 - 2019
Apertus Nonprofit Kft.
  • Wrote Spring Boot code using IntelliJ IDEA.
  • Unified Jenkins build and deploy pipelines.
  • Strengthened development methodologies by introducing unit testing and TDD.
  • Assessed under-performing software and identified ways that it could be improved.
  • Collaborated on all stages of system development lifecycles, from requirements gathering to production releases.
  • Designed the system architecture and integration points between loosely coupled back-end applications.
Technologies: NGINX, Hazelcast, Jenkins, MySQL, Spring, Java, REST APIs, JavaScript, Hibernate, Java 8, Spring Boot, SQL, JUnit, Git, AssertJ, TypeScript, Linux, JBoss

Trainer

2014 - 2017
Freelance Work
  • Taught an assortment of programming courses concerning Java-related technologies and programming theory.
  • Consulted with the clients about the course curriculum.
  • Created course materials with real-world examples.
  • Assessed client workflows and methodologies to customize training material.
  • Prepared and executed exams to measure the students' performance.
Technologies: Apache Maven, GWT, JPA, Spring, Android, Java EE, Java, REST APIs, JavaScript, Spring Boot, SQL, JUnit, Git, AssertJ, TypeScript

Co-founder | CEO | Software Engineer

2012 - 2015
Just Another Company Kft.
  • Delivered projects while meeting the predetermined budget, time parameters, and quality standards.
  • Applied strong leadership talents and problem-solving skills to maintain team efficiency and organize workflows to meet any daily demand.
  • Worked closely with clients to establish problem specifications and system design.
  • Evaluated project requirements and specifications.
  • Developed applications that surpassed client expectations.
  • Wrote Java, Java EE, GWT, and C# code.
Technologies: MySQL, C#, GWT, Java EE, Java, JavaScript, Spring Boot, SQL, JUnit, Git, AssertJ, Linux, JBoss

Ride Balaton

It's an online off-track bicycle tour planner platform with manual and automatic route planning. The related Android application has navigation capabilities.

ERP System

It's a multipurpose ERP system with modules like stock management, calendar, document management, billing, ticketing, reporting, todo management, project planning, and POS.

Author at Baeldung.com

https://www.baeldung.com/author/attila-fejer/
I frequently publish articles about Java-based technologies.

Languages

Java 8, Java, JavaScript, TypeScript, SQL, C#

Frameworks

Spring, Spring Boot, Hibernate, JUnit, Mockito, GWT, Bootstrap, JPA, Angular

Libraries/APIs

JPA 2, Lombok, AssertJ, REST APIs, Liquibase

Platforms

Java EE, Eclipse, Visual Studio Code (VS Code), Android, Linux, Amazon Web Services (AWS), Docker, JBoss

Other

OOP Designs, Architectural Design, Containers, Architecture, Coaching, Team Mentoring

Tools

MapStruct, Eclipse IDE, IntelliJ IDEA, Apache Maven, Gradle, Git, NGINX, WildFly, Google Compute Engine (GCE), Jenkins, GitLab, GitLab CI/CD, GitHub

Paradigms

AOP, Object-relational Mapping (ORM), Design Patterns, Unit Testing, Functional Programming, Test-driven Development (TDD)

Storage

MySQL, MongoDB, Hazelcast

2012 - 2015

Master of Science Degree in Electrical Engineering

Budapest University of Technology and Economics - Budapest, Hungary

2008 - 2012

Bachelor of Science Degree in Computer Engineering

Budapest University of Technology and Economics - Budapest, Hungary

MAY 2019 - PRESENT

Oracle Certified Professional Java 8 Developer

Oracle

MAY 2017 - MAY 2020

Google Certified Associate Android Developer

Google

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