Libor Kramoliš

Customer loans application

Client, advisor, and back-office application for customer loans.

• Configure DB migration scripts using Flyway DB
• Spring-based REST Error handling + Swagger documentation.

Spring Boot · Swagger · Hibernate · MSSQL · Flyway DB · Kotlin · Camunda BPM

Fintech chatbot prototype

Chatbot prototype based on Datlowe technologies with a focus on finance domain.

• Create individual microservice to merge successive user requests and chatbot answers into an overall dialog.
• Integrate NEWTON NanoGrid WebSockets API to provide a voice to text functionality.

Spring Boot · Reactor framework · PostgreSQL · NEWTON NanoGrid WebSockets · Korektor spellchecker · Docker · Mesosphere DC/OS · Spek framework · Kotlin

AppDynamics Platform

Modularization and performance optimization of AppDynamics Controller Java EE application

• Replace Message-driven EJBs by custom lightweight beans.
• Modularization of selected parts of the Controller.
• Custom executor service registry implementation.
• Performance optimization with a focus on memory consumption.

Glassfish · MySql · Gradle · YourKit · jOOQ

Project Helidon - Configuration API

Modern and extensible Java API for reading application configuration. Support different sources and formats.

• Design and development of library modules with a focus on API and core functionality, e.g. changes support based on Java 9 Flow.
• Company-wide presentations of API design and usability.
• Lead development of the library.

Java 9 · Yaml · Hocon · Etcd · JGit · Kubernetes ConfigMap

Performance, Stress and Reliability testing platform

Extensible platform for testing cloud services in a distributed environment with a focus on performance testing.

• Design and development of the platform with a focus on testing agent functionality.
• Developer guide documentation including training video.

Etcd · Kafka · Redis · Logstash · Kibana · Grafana · Docker

Microservices platform

Polyglot microservices platform with a focus on cloud deployment. Java framework to develop standalone microservices.

• Design and development CLI of platform SDK.
• Design and development of a standalone Java framework with a focus on Config API.

Mesos / Marathon · JLine 2 · Docker · Maven plugin

JAX-RS RI (Jersey) development

Jersey is a reference implementation of JAX-RS - RESTful Web services API.

• Design and development of Jersey framework, e.g. tracing support.
• Open source community communication, including blog posting.

JAX-RS 2 · Jersey 2 · Glassfish 4 · Git/Gerrit · Kryo

WebLogic / JRF JAX-RS integration

WebLogic Server is Java EE.

• Integration JAX-RS / Jersey into WebLogic Server (WLS).
• Design and development JAX-RS and OAuth support prototype.
• Bug-fixing of core WLS functionality.

WLS 12.x · Perforce · OAuth

Java microservices platform prototype

Microservices platform prototype with focus on developer productivity.

• Architect whole platform.
• Design and development of core functionality: configuration, runtime modes, automatic class reloading, Gradle plugin.
• Team lead of 4 Java developers.

Java 8 · Spring Loaded · Hocon · Gradle · JLine 2 · Swagger · WLST

Feasibility study of using NoSQL DB to store application logs

• analysis requirements, create prototype

WAS 8 · MongoDB · Work Manager

Migrate obsolete J2EE framework to Java EE 6 platform

The goal is to migrate a subset of an old corporate J2EE framework to IBM WebSphere Application Server (WAS) v8 (Java EE 6).

• design and development of new Java EE 6 framework
• migration an existing service from JAX-RPC to JAXB/JAX-WS

WAS 8 · CDI · JAXB · JAX-WS · JBoss Arquillian

KB J2EE development framework

Custom IoC container. IBM WebSphere Application Server specific code generation. Other: logging, configuration, cache, etc.

• design and development framework features
• technical documentation, presentations

WAS 6.1 · AspectJ · APT · JMX

Electronic forms Web Service (based on Adobe PDF Lifecycle)

• design of caching frequently used PDF templates

WAS 6.1 · Distributed Map

Mobile bank loan calculator

• design REST API of existing loan calculator SOAP Web Service

WAS 6.1 · Jersey

Shared service to process batches of payment requests

PL/SQL API with hundreds of thousands of payment requests a day. Integrates to other 3 services.

• design and development of service
• performance optimizations; parallel processing
• team lead of 4 Java/DB developers

WAS 6.1 · OracleDB · Mainframe · SFTP RA · JDBC · Distributed Map · Cluster Scheduler

REST API for JMX beans

General extension to a corporate J2EE framework. Used to monitor service runtime via HTTP.

• design and development of general extension

WAS 6.1 · Jersey 1.x

Shared service to compute fees

SOAP Web Service that used rule engine (Drools) to select appropriate fee configurations.

• design and development of service
• performance optimizations; parallel processing
• team lead of 4 Java/DB developers

WAS 6.1 · OracleDB · Hibernate · JBoss Drools · JProfiler

Deployment model and application configuration system

Web application (flash) to manage production and test deployment environment and any application configuration too. One application to manage them all.

• whole solution architecture
• development of Java part (JMS, JMX, RA, …)

Flex · OracleDB · JMS · JMX · J2EE RA

Maven build structure pattern

Maven build refactoring and simplification. Shared Maven POM - common KB environment settings.

• analysis of requirements
• development of POM (maven site ready) and plugin to support it

Maven plugins

Web application to manually manage daughter company records

The first KB SOA application, 5 integrated Web Services.

• development of back-end (KB J2EE framework)
• development of front end (JSF, Acegi), including AJAX calls

WAS 6.1 · OracleDB · Hibernate · JSF · AJAX · Acegi Security

The municipality of Prague

Internet / intranet Sun JES Portal server instances with custom portal applications. Integration of various applications/services to the portal.

• Integration of external applications to portal desktop („mini-browser“)
• Internationalization and localization of portal server and AM server.
• Design customization of portal server and AM server.
• Portal desktop configuration.
• Design and implementation of Web Services.
• XML-Signature, feasibility study.

Sun JES Portal · Servlet · XML Signature

Ministry of Industry and Trade

• Design of Web Service interface.
• Implementation of Web Service test client.
• Validation of XML instance against w3c XML Schema definition.

WSDL · XSD · JAXB

VZP (General Health Insurance Company)

Internet portal for clients, partners, and employees of VZP. On-line applications for portal users. Integration with back-end systems in VZP.

• Optimization and refactoring of server-side code.

Servlet · JProfiler

Internal framework team

• Development, optimization, and refactoring of a corporate framework (called XQW) based on Java Servlet & XML. Implementation of tools to support development with XQW framework.
• Implementation of core reusable components.
• Internal Java training and mentoring.

Tomcat · Servlet · XML · Luntbuild · Maven

Czech Statistics Organization (CzSO)

Framework for implementation of CzSO processes.

• Hibernate and JSF, feasibility study

Hibernate · JSF

Development of Java IDE and application platform

• Design and development of NetBeans IDE modules: XML (Model XML, DTD, XML Schema, XSLT, Entity Catalog, etc.), Find in Files, PDF, Open File, etc.
• Module web pages generated from XML by XSLT transformation.
• Technical documentation, communication with Open Source community.
• Design and implementation of GUI components.

NetBeans · XML/XSLT · Swing