Jan Siekierski

Associate Consultant

Poland11 yrs 9 mos experience

Key Highlights

10 years of experience in Java and Kotlin development
Specialized in Data Streaming and Event-Driven Microservices
Led cloud-native application development for global supply chains

Stackforce AI infers this person is a Backend-focused developer in the Cloud Computing and Supply Chain industries.

Contact

Skills

Core Skills

Data StreamingCloud-native DevelopmentBackend DevelopmentDigital BankingSoftware DevelopmentWeb Application DevelopmentSystems AnalysisFinancial Analysis

Other Skills

AJAXActiveMQAnsibleApache Camel 2.15Apache KafkaBashBusiness EnglishBusiness IntelligenceCSSDB2 databaseDDDData MigrationData ModelingDatabase DesignDocker

About

10 years of experience building efficient, maintainable systems in Java and Kotlin for large enterprises Specializing in Data Streaming and Event-Driven Microservices

Experience

Kentra

Data Streaming Consultant

Oct 2024 – Present · 1 yr 5 mos · Poland · Remote

Supporting IT Organizations in design, creation & efficient use of their Data Streaming Platforms through Advisory Consulting & Training workshops

Apache KafkaData Streaming

Wipro

Tech Lead

Sep 2023 – Sep 2024 · 1 yr · Europe · Remote

Driving the creation of a cloud-native distributed backend application at the heart of the Supply Chain for a global market leader.

Apache KafkaCloud-native development

Albert heijn

Senior Kotlin Developer

Mar 2022 – Feb 2023 · 11 mos · Remote · Remote

Development of backend microservices in Kotlin ran on Kubernetes & Azure

Apache KafkaKotlinMicrosoft AzureReactive StreamsBackend development

Gft technologies

Tech Lead

May 2021 – Mar 2022 · 10 mos · Polska

Building a digital bank on AWS with kubernetes, kotlin and terraform

Apache KafkaDigital banking

Db schenker

2 roles

Lead Developer

Promoted

Dec 2018 – May 2021 · 2 yrs 5 mos · Warszawa, woj. mazowieckie, Polska

Responsibilities
Accountability for all technical decisions in the project
Enabling smooth workflow through anticipating potential problems or blockages
Facilitating communication within the team
Technologies:
Java 10, Spring Boot 2, Spring Data, Spock
Microservices, DDD
Kubernetes, Docker, Gitlab CI/CD

Java 10Spring Boot 2Spring DataSpockMicroservicesDDD+4

Senior Java Developer

Sep 2018 – Dec 2018 · 3 mos · Warszawa, woj. mazowieckie, Polska

Technologies:
Java 10, Spring Boot 2, Spring Data, Spock
Microservices, DDD
Kubernetes, Docker, Gitlab CI/CD

Java 10Spring Boot 2Spring DataSpockMicroservicesDDD+4

Kodilla

Mentor

Aug 2017 – Mar 2018 · 7 mos

Mentoring students in online Java bootcamp:
Checking assignments
Weekly skype calls
Explaining software development theory, job market, good practices etc

Icompass

Java Developer

Aug 2016 – May 2018 · 1 yr 9 mos · Warszawa, woj. mazowieckie, Polska

Backend web app development:
Jboss AS
Java 8
Spring 4.2
Hibernate
RESTful webservices architecture
ESB Development for Jboss Fuse:
Apache Camel 2.15
ActiveMQ
extensive integration testing
project built from scratch
support in design and monitoring code quality
DevOps, CI/CD (across all projects):
GitLab
Ansible
Docker

Java 8Spring 4.2HibernateRESTful webservicesApache Camel 2.15ActiveMQ+4

Generali

Java Developer

Jun 2015 – Jun 2016 · 1 yr · Warszawa, woj. mazowieckie, Polska

Development and maintanence of internal and external web applications.
Technologies:
Oracle database, Jboss AS
Spring, Hibernate, JAXWS (SOAP Webservices)
JSP, HTML, CSS, jQuery
Git, Maven, Jenkins, Stash

Oracle databaseJboss ASSpringHibernateJAXWSJSP+8

Comarch

2 roles

Java Developer

Promoted

Mar 2014 – Jun 2015 · 1 yr 3 mos

Developer in ePUAP project.
Technologies:
DB2 database, WebSphere AS
Java EE (JPA, EJB, JSF, JMS), Spring
Git, Maven, Jenkins, Gerrit
JSP, HTML, CSS, jQuery, AJAX

DB2 databaseWebSphere ASJava EESpringGitMaven+8

Systems Analyst

Feb 2013 – Mar 2014 · 1 yr 1 mo

data modeling and using UML
data migration from various sources (from simple spreadsheets to gigabytes of flat files) using Python, Bash, PostgreSQL
supporting programming work in Python and PHP (moodle, limesurvey)
deployment of minor systems (moodle, limesurvey) to production using git
report design and creation in SSRS
day to day work with the customer on system analysis
customer training after system launch

data modelingUMLdata migrationPythonBashPostgreSQL+3

Acp pharma sa

Financial Analyst

Dec 2012 – Feb 2013 · 2 mos

creating weekly and monthly reports for Purchasing, Marketing and Financial departments
financial analysis for Purchasing Department
reporting system redesign from huge complex network of manually operated Ms Access files to a simple and automated combination of Excel files connected directly to Oracle database, refreshed by scheduled jobs using VBA and PL/SQL

ExcelOracle databaseVBAPL/SQLFinancial analysis