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Location

Poland

Rate

$33  / per hour

Years of experience

13+

About

With over 13 years of commercial experience as a software engineer, I specialize in programming in Java and JVM-based languages. I have been actively involved in Big Data projects for over three years, covering all stages of the software development lifecycle, from designing architecture to deploying on production servers. My expertise includes developing highly scalable data pipelines using Kafka, Spark, Scala, and Cassandra, as well as enhancing scalability and cost savings by migrating data processing applications to the AWS Cloud. I have a proven ability to effectively solve complex problems, including those related to legacy applications, and adapt flexibly to diverse business environments. In my most recent role as a Software Engineer at Eniro, I developed scalable data pipelines and backend applications, streamlined authentication processes, and enhanced system reliability using technologies such as Java, Spring Boot, and AWS. Previously, at Unlockd/Isobar, I maintained an advertising and rewarding system and developed versatile backend applications to support global clients. My work at the Polish Security Printing Works involved developing secure applications for digital signature verification and cryptographic card management. I hold a Master’s and Bachelor’s degree in Computer Science from the Warsaw University of Technology and possess certifications in ITIL, PRINCE2, and Oracle Java programming. My technical skills include expertise in Apache Spark, SQL, Cassandra, PostgreSQL, Kubernetes, Spring Boot, and AWS, among others.

Tech Stack

Scala, API, AWS, Database Management System (DBMS), Git, Java, JUnit Testing Framework, MongoDB, REST, Spark, SQL

Experience

  • Developing Scalable Data Pipelines: Developed highly scalable data pipelines using Kafka, Spark, Scala, and Cassandra, processing over 200GB of data monthly at Eniro.
  • Cloud Migration and Optimization: Enhanced scalability and cost savings by moving data processing applications to AWS Cloud (Kubernetes) from on-premises (OpenShift) at Eniro.
  • Backend Development: Utilized Java, Spring Boot, and relational databases to create backend parts of customer portals and other applications, ensuring robust performance and reliability.
  • Authentication and Security: Streamlined authentication processes using Oauth2, Spring Boot, and Spring Cloud, reducing security vulnerabilities and improving system reliability at Eniro.
  • Digital Signature Solutions: Developed secure standalone applications for digital signature verification, encryption, and decryption of documents using cryptographic smart cards at Polish Security Printing Works.
  • Big Data Processing and Analysis: Utilized AWS Kinesis and Play Framework to develop and maintain an advertising and rewarding system, generating reports from mobile application data at Unlockd/Isobar.
  • Cross-Functional Collaboration: Worked cross-functionally with engineers, data scientists, and business analysts to develop and optimize algorithmic trading applications and other complex systems at ITMAGINATION.

Employment history

SOFTWARE ENGINEER, ENIRO, SWEDEN (REMOTE) June 2016 – December 2023

▪ Developed highly scalable data pipelines using Kafka, Spark, Scala, Cassandra and OpenShift, processing over 200GB of data mon thlythly.
▪ Enhanced scalability/cost savings by moving data processing applications to AWS Cloud(Kubernetes) from on on-prem(OpenShift).
▪ Utilized Java, Spring Boot & relational databases to create a backend part of a customer portal with statistics on traffic from internal and 3rd party systems.
▪ Streamlined authentication process using Oauth2, Spring Boot, and Spring Cloud, reducing security vulnerabilities and improving system reliability.
▪ Developed a robust backend for POI POI-like system, resulting in improved customer satisfaction and retention.

Key Technologies: JAVA, Scala, Spring Boot/Cloud, Hibernate, Feign, Liquibase, QueryDSL, PostgreSQL, MongoDB, Cassandra, Junit, Mockito, AWS, OpenShift, Git , Jenkins , Zeppelin

SOFTWARE ENGINEER, UNLOCKD, ISOBARSOBAR, AUSTRALIA (REMOTE) May 2015 – August 2016

▪ Developed and maintained advertising and rewarding system, generating reports for data from mobile applications, using AWS Kinesis and Play Framework.
▪ Streamlined multiple tenant support for global clients through development of a versatile, backend application with technologies like Java, Play Framework and PostgreSQL.

Key Technologies : JAVA, Play Framework, Spring, Hibernate, Liquibase, Swagger, QueryDSL, PostgreSQL, REST, AWS Kinesis, AWS, JUnit.

SOFTWARE ENGINEER, POLISH SECURITY PRINTING WORKSORKS, POLAND February 2014 – May 2016

▪ Developed secure standalone application for digital signature Qualified Certification Authority, digital signature verification, encryption and decryption documents using cryptographic smart cards, ensuring interoperability with standards for digital
signaturesignature.
▪ Maintained system for management of cryptographic cards: certificate requests, create and write certificates on smart cards, revoke certificates certificates.
▪ Developed GUI and webservice components for digital sign certification requests using cryptographic cards and java applets applets.
▪ Developed functions for the business processes, GUI elements development, unit testing, code refactoring and maintaining the processing of system documents documents.

Key Technologies: JAVA 7/8, EJB, Hibernate, GWT, JavaFX, Java Applets, Wildfly 9/JBoss 7, PostgreSQL, IBM DB2, Maven, Bonita, Orbeon, eID DSS, IAIK

JUNIOR SOFTWARE ENGINEER, DIGITAL VIRGO S.A. April 2023 – January 2014

▪ Assisted in the development and maintenance of software applications, writing clean, efficient, and well-documented code using Java and other relevant technologies.
▪ Conducted unit testing and participated in system testing to ensure the quality and functionality of software applications, identifying and fixing bugs to maintain high performance and reliability.
▪ Collaborated with senior developers to implement new features and enhancements, following project specifications and contributing to the continuous improvement of the software products.

JUNIOR SOFTWARE ENGINEER, QUALITY BUSINESS SOFTWARE August 2011 – December 2011

▪ Assisted in the development and maintenance of software applications, ensuring code quality and adherence to project requirements using Java and related technologies.
▪ Identified and resolved software defects and issues reported by users or discovered during testing, contributing to the overall stability and performance of the applications.
▪ Worked closely with senior developers and other team members to implement new features and improvements, participating in code reviews and collaborative problem-solving sessions.

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