Jacek Psiuk

Software Engineering Expert at Codewise
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Contact Information
us****@****om
(386) 825-5501
Location
PL
Languages
  • Polish Native or bilingual proficiency
  • English Full professional proficiency
  • Spanish Elementary proficiency

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Credentials

  • Scrum Master Certified (SMC)
    Scrum Alliance
    Jan, 2017
    - Oct, 2024
  • Oracle Certified Professional, Java SE 6 Programmer
    Oracle
    Jan, 2011
    - Oct, 2024

Experience

  • Codewise
    • Poland
    • IT Services and IT Consulting
    • 1 - 100 Employee
    • Software Engineering Expert
      • Jul 2016 - Present

      Development of voluum.com backend - highly available and scalable low-latency system hosted in the AWS cloud in several regions: handling and ingesting 21.5k rq/s of Internet traffic, aggregation reporting serving 60 rq/s with 35 mb/s of data, supporting thousands of subscribed users with up to 20 signins/s, deployed as ~30 microservices written in Java (90%) and Kotlin. Complete responsibility for the development team for technical design and implementation of the working solution. Constant evaluation and maintenance of clean architecture while controlling the technical debt. Identifying common logic and extracting it as shared libraries that aid distributed computation; some with potential for open-sourcing. Analysis and implementation of highly-performant multi-threaded code. Profiling and optimizing code for efficiency and cost-saving. Embedding observability into created solutions utilizing Loggly and Datadog. Building business intelligence over an event processing mechanism. Setting up a CI/CD pipeline based on Jenkins and in-house deploy tools with daily production deployments. Sparingly leveraging IaC using Terraform. Fostering knowledge sharing in the form of presentations. Recruiting and mentoring joining members of the team. Show less

  • Luxoft
    • Switzerland
    • IT Services and IT Consulting
    • 700 & Above Employee
    • Senior Software Engineer, Tech Lead
      • Mar 2014 - Jun 2016

      Handling a fusion of two major batch systems processing financial data of large scale (Java, data distribution over NIO, FitNesse, PL/SQL, Oracle). After six months promoted to a lead position. Leading a Scrum team of 6 people. Mentoring and representing in front of overseas clients in the UK and US. Handling a fusion of two major batch systems processing financial data of large scale (Java, data distribution over NIO, FitNesse, PL/SQL, Oracle). After six months promoted to a lead position. Leading a Scrum team of 6 people. Mentoring and representing in front of overseas clients in the UK and US.

  • Sabre Corporation
    • United States
    • IT Services and IT Consulting
    • 700 & Above Employee
    • Software Developer Contributor
      • Jan 2013 - Feb 2014

      Analysis and development of a Java enterprise system targetting the travel industry. My work was aimed at both business and technical goals. The product was a Web Services platform built using Apache CXF, Spring, Hibernate, jBPM, Tomcat. Analysis and development of a Java enterprise system targetting the travel industry. My work was aimed at both business and technical goals. The product was a Web Services platform built using Apache CXF, Spring, Hibernate, jBPM, Tomcat.

  • AGH University of Science and Technology
    • Poland
    • Higher Education
    • 300 - 400 Employee
    • Researcher
      • Oct 2011 - Dec 2012

      Research and development in two academic projects in the area of adaptive SOA systems (Java, OSGi, JBoss Drools, Eclipse plugin development, Android). Research and development in two academic projects in the area of adaptive SOA systems (Java, OSGi, JBoss Drools, Eclipse plugin development, Android).

  • DreamLab
    • Poland
    • Information Technology & Services
    • 1 - 100 Employee
    • Software Developer Intern
      • Jul 2009 - Dec 2010

      Development of authorization system (Python, PL/SQL, Oracle). Design and implementation of a highly efficient cache (C++, Open-Source, multithreading) which won first prize in a competition among interns. Development of authorization system (Python, PL/SQL, Oracle). Design and implementation of a highly efficient cache (C++, Open-Source, multithreading) which won first prize in a competition among interns.

Education

  • AGH University of Science and Technology
    Computer Science
    2011 - 2014
  • AGH University of Science and Technology
    Master of Science - MS, Computer Science
    2006 - 2011
  • Universitat Politècnica de Catalunya
    Master of Science - MS, Computer Science
    2011 - 2011

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