Toolbox

Introduction

My primary language is Java (SE 8 through 21), with production experience across Spring Boot, Spring Framework, and a range of JEE applications. I have delivered 20+ Spring applications and two large-scale JEE platforms.

I work on the full backend stack: REST APIs, data persistence, cloud infrastructure, and CI/CD pipelines. Available for architecture reviews, greenfield projects, and hands-on engineering.

See the Curriculum Vitae for employment history, education, and certifications.

Specific knowledge in following domains

Affiliate networks
- affilinet, big European provider
- Awin, previously known as Zanox
Digital Signage - software solutions for installations with a few thousand devices
E-commerce - development of custom software solutions
Insurance companies - development of custom software solutions
Payment providers / APIs
- PayPal Integration
- Fidor Integration - German bank with REST API

General

RESTful web services
HTML - Basic
CSS - Basic
JavaScript - Basic
XML
JSON
SQL
Web services

Java Standards

Java SE 8/9
Java EE 6 with EJB 3
JSF 2.2 with Primefaces
JPA 2.1
JAX-RS - RESTful web services
JAX-WS - SOAP web services
and most likely a few others we use unknowingly

Spring

Spring Framework
Spring Boot
Spring Data JPA
Spring Security
Spring Social
Spring Social Facebook
Spring MVC
Spring + Thymeleaf

Testing

JUnit 4/5 – JUnit is a simple framework to write repeatable tests
TestNG - Also a testing framework for unit-, functional-, end-to-end-, integration-testing aso.
Mockito – Mocking framework for unit tests in Java
AssertJ – Fluent assertions for Java
REST-assured – A framework for testing REST APIs and validate their responses

Build tools

Gradle - enables building of applications of multiples types and languages
Maven - managed by the Apache Foundation

Databases

PostgreSQL – A open source object-relational database system. (My preferred DB)
MySQL - Also an open source database which is easy to use
mongoDB - NoSQL database for data where not all aspects of ACID are needed

Servers

Nginx - used for delivery of static content and as a reverse proxy for Java applications
Tomcat - for deployment of Java applications, also as embedded servlet container
Undertow - as embedded servlet container, faster than Tomcat and with lower footprint
JBoss - used for Java EE applications

Cloud

MongoDB Atlas - Automation of clusters/users/databases/security setup and VPC peering with AWS infrastructure by API
Automatic setup of AWS infrastructure with CloudFormation and tools like autostacker24 (Infrastructure As Code)
Planning and setup of the following AWS infrastructure
AWS Elastic Load Balancer (ELB)
AWS Elastic Compute 2 (EC2)
AWS Relational Database Service (RDS)
AWS Simple Storage Service (S3)
AWS Elastic Beanstalk (EB)
AWS Route 53

Portal software

Liferay 7 GA1/GA2/GA3, Web-Services with OSGI, Manipulation

Kamil Wozniak