Robert R. - Further development of an internal application

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Szczecin, Poland

Experience

Feb 2025 - Present

9 months

Further development of an internal application

Fima Maschinenbau GmbH

Adjusted existing functionalities, fixed bugs, and developed new features.
Multithreading, technical calculations in fluid dynamics, graphics, data import/export, reading measurement device data in separate threads.
Technologies: Delphi 12, FireDAC, parallel programming, multithreading, communication over IP and serial bus.
My contribution: development, bug fixing, testing, documentation.

Jul 2024 - Apr 2025

10 months

Development of a data transmission system for ARM architecture

Maenken Systems

Developed a data transmission system for ARM architecture using Lazarus and client software with Delphi.
Technologies: Delphi, Lazarus, ARM, cross-compiling, multithreading, REST, HTTP, Git, GitLab.
My contribution: architecture, analysis, development, testing, documentation.

Jan 2024 - Dec 2025

2 years

Instructor

German Navy Shipyard

Led several courses on Delphi/Firebird (intro, advanced, complex topics) for employees of the German Navy Shipyard.
Designed the training, delivered it, and advised on database and software architecture.
Technologies: Delphi 12, FireDAC, Firebird.
My contribution: training, consulting, idea generation.

Sep 2023 - May 2024

9 months

Development of a software system to optimize energy distribution in heating systems

MyWarm

Technologies: PHP, MySQL, Bitrix, Git, GitLab.
My contribution: architecture, analysis, development, testing, documentation.

Jun 2023 - Feb 2024

9 months

Vienna, Austria

Consulting

Federal Ministry for Climate Protection, Environment, Energy, Mobility, Innovation and Technology

Advised on architecture, performance, deployment, and interfaces in Section V: Environment and Circular Economy.
Technologies: Java, Spring, OpenAPI, Python, Jira, Confluence, Camunda, GitHub, ITIL.
My contribution: architecture, analysis, requirements gathering, new designs, consulting, UX testing, documentation.

Feb 2022 - Nov 2022

10 months

Development of new features in Dispotafel

Immobilien Service Deutschland

Development of new features in Dispotafel, a tool for planning cleaning and service assignments. Documentation.
Design and redesign of the user interface.
Designing and implementing the SOAP client for the remuneration and commission calculator.
Defining the WSDL file.
Database interface.
Data migration.
Technologies: Delphi 10, 11, Informix, Firebird, Java, Maven, SOAP, DevExpress, JCL, TMS, Github.
Own contribution: development, testing, documentation.

Nov 2021 - Mar 2022

5 months

Lead Developer

Bayer CropScience

Further development of a mobile application and its backends for farmers. The app calculates amounts and application cycles of fertilizers and fungicides based on crop types and regions.
Analysis of the existing solution and backlog.
In the backend: replacing a monolith, implementing microservices.
In the frontend: adjusting the user interface according to the product owner's requirements.
Implementation of a Kafka client.
Expanding unit tests.
Bug fixing.
Handover of the project to a development team, supporting the team and documentation.
Technologies: Java, PHP, Spring/Spring Boot, Hibernate, Kafka, Microservices, Liquibase, Maven, AWS, GraphQL, cloud, REST, JSON, XML, Git, Gitlab, DevOps, CI/CD, Docker, JavaDoc, React Native, Agile, JavaScript.
Own contribution: architecture, analysis, requirements analysis, testing, documentation, supporting the team in taking over development, leading, coaching.

Jun 2021 - Dec 2021

7 months

Lead Developer

ostermann.de

Project and implementation of an interface (microservice architecture) between the existing ERP system and a new version of the ERP system. The interface should compare imported data and generate a report for migration.
Analysis of the data formats provided by the existing ERP system as a database table.
Design of the ORM models.
Designing and implementing a converter that imports data and exports it to the new ERP system.
Design and implementation of a backend application.
Expanding unit tests.
Technologies: PHP7, Laravel, MySQL, Eloquent, PHPStorm, Java, Spring/Spring Boot, Spring Batch, Spring Cloud Stream, Kafka, Maven, microservices, REST, jQuery, JSON, XML, SCRUM, Agile, Git, Github, CI/CD, PHPDoc.
Own contribution: architecture, analysis, requirements analysis, testing, performance and load testing, middleware implementation, documentation.

Jan 2021 - May 2023

2 years 5 months

Vienna, Austria

Configuration, customization and testing of the web servers, load balancers and CraftCMS environment

Stadtamt Wien

Creating documentation, advising on architecture and performance.
Technologies: PHP7, Laravel, Nginx, RedHat Linux, CraftCMS, Docker, Kubernetes, Terraform, Jira, Confluence, Github, ITIL.
Own contribution: architecture, analysis, configuration, consulting, testing, documentation.

Feb 2020 - Present

5 years 9 months

Internal/private project, smart home with Arduino and Raspberry Pi

Development of a central server and multiple clients for the smart home system.
As a sandbox for new technologies: architecture, development, deployment and testing of clients, servers and frontends in a heterogeneous environment with event-driven architecture.
Database architecture, optimizing database queries.
Technologies: Java, Spring/Spring Boot, Spring Cloud Stream, Symfony 7, Yii2, Delphi Berlin, Angular, TypeScript, jQuery, Groovy, microservices, Maven, MySQL, Firebird/Interbase, FireDAC, Kotlin, UML, REST, JSON, XML, Twig, PHPDoc, Arduino C, Arduino FreeRTOS, Lumen, Hibernate, Kafka, MongoDB, MQTT, Symfony Workflow, Symfony Messenger, IBM MQ, AWS, Grafana, Camunda, CI/CD, design patterns.
Own contribution: architecture, requirements analysis, development, testing, TDD, BDD, deployment, maintenance, DevOps, Terraform, Docker, Kubernetes, preparing and maintaining pipelines for testing and roll-out.

Feb 2020 - Sep 2022

2 years 8 months

Hanover, Germany

Lead Developer

Central Police Directorate Lower Saxony

Upgrading a legacy system (managing internal resources, applications, events, data transfer and backup, reports) from PHP 5 to PHP 7.
Static analysis of the codebase. Identifying parts of the code that need refactoring.
Refactoring.
Implementing a new database interface, adjusting external interfaces.
Design and implementation of objects that replace the existing logic.
Removing global variables.
Unit tests, integration tests, and bug fixing.
Security identification management via a REST API.
Documentation.
Technologies: PHP5+7, internal MVC framework based on Laravel, MySQL, Security Identification Manager, Eloquent, PHPStorm, Jenkins, REST, JSON, XML, SCRUM, Agile, Git, Gitlab, SVN, SVN Hook Scripts, PHPDoc, DevOps, Docker, Kubernetes.
Own contributions: architecture, analysis, requirements analysis, upgrading a legacy system from PHP 5 to PHP 7, refactoring, testing, TDD (test driven development), middleware implementation, migration, documentation.

Dec 2019 - Jan 2020

2 months

Backend development of a retail platform

aboutyou.com

Analysis of vulnerabilities in the transaction system, design of countermeasures.
Development of a module to calculate delivery time based on data about orders, shipping addresses, and carriers.
Development of a module for Google Analytics.
Expansion of unit tests.
Technologies: PHP5+7, internal MVC framework based on Symfony, microservices, OAuth2, MySQL, PHPStorm, AWS, cloud, REST, Python, Docker, Kubernetes, Symfony Workflow, JSON, XML, SCRUM, Agile, Git, Gitlab, Grafana, PHPDoc.
Own contributions: analysis, refactoring, development, debugging, testing, unit tests, performance and load testing.

Jan 2019 - Nov 2019

11 months

Hamburg, Germany

Development of a platform for service management

Stulz

Development of an import tool for the customer database.
Development of new features for the deployment calendar.
Development of a REST client.
Implementation of a tracking module and unit tests.
Technologies: PHP7, Laravel, MySQL, Eloquent, microservices, PHPStorm, Bootstrap, REST, JSON, Angular, Typescript, jQuery, Docker, XML, SCRUM, Agile, Git, Github, PHPDoc, design patterns.
Own contributions: analysis, refactoring, development, middleware implementation, scrum coaching.

Sep 2018 - Dec 2018

4 months

Development of a platform for rewards management in retail

skon.de

Development of a price and rewards calculator that is accessed as a REST server.
Implementation of unit tests.
Technologies: PHP7 (PHP7.2), MySQL, JavaScript, Angular, Typescript, Bootstrap, PHPStorm, REST, JSON, XML, OAuth2, SCRUM, Git, Bitbucket, Docker, Kubernetes, internal framework developed based on Symfony 4, Twig, PHPDoc.
Own contributions: analysis, refactoring, development.

Sep 2018 - Nov 2018

3 months

Lead Developer

agrora.market

Development of a platform for agricultural trade. A prototype of the platform had to be developed into a live version in a short time. Users of the platform publish their buy/sell offers for agricultural products (grains, oilseeds, among others). Customers negotiate conditions online and finalize contracts.
Architecture and development of the platform, both frontend and backend.
Development of a REST client for exchange server APIs.
Implementation of unit tests.
Technologies: PHP7 (PHP7.2), MySQL, microservices, JavaScript, Angular, Typescript, jQuery, Bootstrap, PHPStorm, Python, UML, REST, JSON, XML, SCRUM, Git, Github, Docker, Kubernetes, Symfony 3+4, Twig, PHPDoc, DevOps, Selenium, architecture patterns, design patterns.
Own contributions: architecture, requirements analysis, refactoring, development, testing, unit tests, UX tests, setting up CI/CD pipelines, scrum coaching.

Sep 2018 - Oct 2018

2 months

Co-development, refactoring and bug fixing of the existing backend system for shop billing

mobilcom-debitel

Migration of the code base from Delphi 5 to Delphi Berlin.
Development of modules for price calculation, stock level calculation and data/database interface synchronization between the central server and the individual shops.
Technologies: Delphi Berlin, Delphi 5, Firebird, IB Expert, UniDAC, FastReport, C#, .NET, XML, SOAP, Github, JIRA, SCRUM.
Own contribution: analysis, refactoring, development.

Jun 2018 - Aug 2018

3 months

Co-development and refactoring of the existing backend system for health insurance billing

optica.de

Development of modules that deliver data on provided services as XML files to a server.
Refactoring a monolith towards microservices.
Implementation of unit tests.
Technologies: PHP5, Zend, MySQL, JavaScript, Angular, Typescript, Redmine, SVN, SVN hook scripts, PHPStorm, REST, JSON, Docker, Kubernetes, refactoring (from monolith to microservices), XML, SCRUM.
Own contribution: analysis, refactoring, development, legacy code development.

Apr 2018 - Jun 2018

3 months

Development and refactoring of the existing backend system for credit consulting

finanzcheck.de

Development of a price and interest comparison platform for banking products.
Technologies: PHP5, Symfony3, MySQL, Propel, MongoDB, Grafana, JavaScript, Jira, Git, Bitbucket, PHPStorm, REST, JSON, XML, SCRUM, Docker, Kubernetes, PHPDoc.
Own contribution: analysis, refactoring, development.

Mar 2018 - May 2018

3 months

Lead developer

yas.life

Design and architecture of a multi-tenant environment in the backend for a fitness app.
Design and architecture of a multi-tenant environment.
Implementation of guidelines for the development team.
Database adaptation.
Support for the development team.
Technologies: Java, Spring, Spring Boot, UML Swing, microservices, Hibernate, MongoDB, Grafana, OAuth2, Jenkins, CI/CD, Jira, Git, GitHub, Docker, AWS, cloud, Kubernetes, REST, JSON, SCRUM, Maven, JavaDoc, architecture patterns.
Own contribution: architecture, requirements analysis, refactoring, TDD (test driven development).

Sep 2017 - Mar 2018

7 months

Team member

DBConnect

Development, refactoring and bug fixing in a booking/tracking system for car sharing and city bikes.
Implementation of a price calculator (as a SOAP server).
Technologies: PHP4, PHP5, MySQL, Jira, SVN, Git, PHPStorm, JavaScript, Typescript, REST, XML, JSON, Docker, Smarty, SCRUM.
Own contribution: development, code reviews, analysis, refactoring (from monolith to microservices), legacy code development, tests, unit tests, UX tests, debugging.

Oct 2016 - Aug 2017

11 months

Backend Developer

AirBerlin

Member of a backend developer team. Developed, refactored, and optimized a new version of the booking/tracking system for airports (shopping, booking, payment).
Intensive use of SCRUM/SAFe.
Developed interfaces to external systems: Amadeus, Comarch, Sixt.
Server-side programming of interfaces for the frontend.
Imported/exported/recalculated frequent flyer cards using batch programming and cron jobs.
Security Identification Management via a REST API.
Technologies: Java, Spring/Spring Boot, Spring Batch, Swing, Hibernate, Kafka, Elasticsearch, microservices, Jira, Jenkins, Git, PHP, PHPStorm, Perl, cron, UML, REST, XML, JSON, SOAP, RIAK, Redis, OAuth2, Security Identification Manager, Angular, TypeScript, JavaScript, Splunk, Google Analytics, SCRUM, SAFe, JavaDoc, Maven, Docker, Kubernetes, design patterns.
Own contribution: architecture, development, code reviews, analysis, refactoring, legacy code migration, tests, unit tests, performance and load tests, Selenium, debugging, 3rd level support.

Apr 2015 - Sep 2016

1 year 6 months

Lead Developer

rieber.de

Developed an intelligent food-flow system based on HACCP rules.
Backend services of the system are accessible via a browser cockpit (for desktop clients) and iOS/Android apps (for mobile clients).
The current version of the cockpit is being refactored with AngularJS as part of a responsive design approach.
Another group of services handles asynchronous calls from various sensors that report temperatures from thermoport containers (insulated containers used to transport meals).
A Symfony controller provides a REST interface.
Data is transferred in XML or JSON format.
Frontend includes adjustments and new features with HTML, CSS, JavaScript.
Prepared pipelines for roll-out.
Technologies: PHP (PHP5), Symfony2 (2.5, 2.6), MySQL, microservices, Jira, Jenkins, Docker, Kubernetes, CI/CD, Git, PHPStorm, UML, Smarty, REST, XML, JSON, AngularJS, JavaScript, Ajax, HTML, CSS, OAuth2, PHPDoc, DevOps, Azure, cloud, responsive design, design patterns, architecture patterns.
Own contribution: architecture, creating project plans, code reviews, analysis, refactoring, legacy code migration from monolith to microservices, tests, debugging, preparing, testing and maintaining CI/CD and Docker pipelines, Scrum Master, Scrum coaching.

Jan 2015 - Apr 2015

4 months

Developer

modix.de

Various development tasks in the client's system.
Technologies: PHP, Zend, MySQL, Jira, SVN, Zend Studio, Docker, Smarty.
Own contribution: development, code reviews, analysis, refactoring, legacy code migration, tests, debugging.

Oct 2014 - Dec 2014

3 months

Developer

clickbus.de

Part of an international team (Germany, Brazil, Poland, Turkey) in developing a price comparison platform and a booking portal for long-distance bus travel.
Extracted price lists from various bus companies and operators through their REST and SOAP interfaces.
Developed new features, debugging, code reviews.
Technologies: PHP, Symfony2, MySQL, OAuth2, LDAP, Twig, PHPUnit, PHP Code Sniffer, jQuery, SOAP, REST, microservices, Docker, Kubernetes, Jira, SCRUM, PHPDoc.
Own contribution: development, refactoring, debugging.

Jun 2014 - Sep 2014

4 months

Migration of a trading tool

modix.de

Migrated a trading tool (around 26,000 PHP scripts) for new and used cars from ISO to UTF-8.
Adjusted relevant functions in the code and interfaces to external systems.
Technologies: PHP4+5, Zend, MySQL, Jira, LDAP, REST, SVN, Zend Studio, Smarty, Docker.
Own contribution: code reviews, analysis, refactoring, legacy code migration, tests.

Jan 2014 - May 2014

5 months

Karlsruhe, Germany

Backend Developer

Flagbit.de

A billing system for energy supply, the electricity and gas market (quantum.de + municipal utilities).
Input of factors relevant for price lists and reading out price series (prices were determined in 15-minute steps for certain periods – like months) via a REST interface.
Interface documentation was created with swagger.io.
Technologies: PHP, Symfony2, Doctrine, YAML, Twig, REST, Swagger.io, Angular, Typescript, Jenkins, git, Jira, plan.io, Docker, PHPStorm, PHPDoc, sphinx, confluence.
My contribution: development, testing.

Dec 2012 - Nov 2013

1 year

Developing an iOS App for a naturopathic clinic

First encounters with the mobile world.
Designing and implementing an app to schedule patient visits (calendar).
Technologies: Objective-C, iOS, OOD/OOP, SCRUM, Xcode.
My contribution: SCRUM member, implementation.

Nov 2012 - Nov 2013

1 year 1 month

Wolfsburg, Germany

Report Generator for a Module Database

Volkswagen AG

Designed and architected the solution.
Defined reports with YAML scripts, engine in PHP5; graphical representation of the structure of modules, module families and kits, and process flows.
Implemented a PDF generator.
Implemented a REST client to transfer generated files to a DMS server (Document Management System).
Managed an archive of module images.
Technologies: OOD/OOP, PHP, MySQL, YAML, UML, REST, regular expressions, Wiki, OTRS, SVN, SVN hook scripts, archive (internal VW DMS).
My contribution: architecture, implementation, testing.

Nov 2011 - Oct 2012

1 year

SCRUM Member

fabrykagier.pl (game factory)

Universal interface between the frontend (Flash, Unity3d or other frontend technologies) and social platforms (Facebook, Google+).
Defined game assets (items, virals, quests, tutorials).
Measured backend load.
Automated starting of cloud servers.
Modules for game monetization.
All interface services were accessed via REST.
Architected and developed a very lightweight MVC framework for performance.
The framework's central controller was the entry point for REST calls.
Greenfield project.
Technologies: OOD/OOP, UML, PHP5, Apache, nginx, REST, MVC, JSON, MySQL, MongoDB, Memcached, Jenkins, SVN, GitHub, TDD (test driven development), unit tests, Facebook API, HTML, CSS, SCRUM, Eclipse, NetBeans.
My contribution: design, architecture, implementation.

Mar 2010 - Mar 2011

1 year 1 month

Backend Developer

vivio.pl

Backend developer on a Facebook game project.
Architected and built the backend with PHP and Zend, designed a sharded database in Amazon cloud.
Implemented communication between the frontend (Flash) and backend using AMF.
Technologies: OOD/OOP, PHP, Zend, Apache, SQL, REST, AWS, EC2, sharding, AMF, UML, Basecamp, SVN, SCRUM, Eclipse.
My contribution: SCRUM member, backend architecture and implementation, testing.

Feb 2009 - Mar 2010

1 year 2 months

Laboratory workflow system project

Laboratory workflow system project for a lab conducting tests for the construction industry.
Technologies: OOD, UML.
My role: architecture.

Mar 2007 - Mar 2010

3 years 1 month

Szczecin, Poland

Project management

espol.pl

Collaboration in a team on the project, implementation and maintenance of a web-based billing system for triple-play billing (approx. 20,000 customers).
Creating quotes, contracts, invoices (internet, IPTV, VOD, VoIP), importing bank statements, creating configuration files for access servers and access points; a report generator; access and traffic shaping via RADIUS; topology mapping.
Technologies: OOD/OOP, PHP4+5, MySQL, HTML, CSS, JavaScript, Wiki, Redmine, UML, design patterns, Smarty, SVN, MVC, RADIUS, REST, SOAP, XML, Eclipse.
My role: concept, architecture, implementation, testing, maintenance, project management.

Jan 2006 - Dec 2007

2 years

Consultant

Institute of Paleobiology

Consulting on setting up a database of animal species.
Integrating existing archives and building a new one.
The key was to design an architecture that guarantees the data stays readable and usable over several decades.
This included a continuous migration feature to move files and databases to new formats.
Technologies: DMS, various file system archives, MediaWiki, migration scripts.
My role: design, architecture, consulting.

Jan 2006 - Dec 2006

1 year

Development of a framework for content management based on IIS/ISAPI

Technologies: Delphi, Pascal, IIS.
My role: development, testing.

Jan 2006 - Dec 2006

1 year

Szczecin, Poland

Porting the general practitioners' system to PHP5

Porting the general practitioners' system to PHP5: patient database, calendar backend, digital patient record, report generator.
As part of a reorganization of GP practices in Poland, private clinics were created. They were previously managed by local governments.
In my city (Szczecin, population ~400,000) I took the archived patient data from a mainframe, converted it, split it, and stored it in each new clinic's database.
Then came the data cleaning process, partly automated, partly manual.
Technologies: PHP, MySQL, HTML, JavaScript, mainframe, file system, refactoring.
My role: implementation, migration.

Jan 2005 - Dec 2005

1 year

Development of a 3-layer application for an optics workshop

Project includes: data modeling, implementation of stored procedures in an SQL database, user interface development, application server development, development of the communication protocol.
Technologies: OOD/OOP, Delphi, Pascal, Firebird, SQL, HTTP, TCP/IP, 3-layer.
Own contribution: implementation.

Jan 2005 - Dec 2005

1 year

Development of an email tool for an existing web framework under IIS

The tool stores emails coming from the framework in its own database (Interbase), sends them in email campaigns, logs events, generates reports on campaigns (successfully completed, aborted), and searches for duplicate emails.
Afterwards, developed an admin panel in PHP4 (gained first experience with web scripting languages like PHP).
Technologies: OOD/OOP, Delphi, Pascal, Interbase, SQL, HTTP, PHP.
Own contribution: implementation.

Jan 2005 - Dec 2005

1 year

Development of a module in a database application for a city courier company

Managing customer orders, placing orders – connecting with available couriers.
Technologies: Delphi, Pascal, TCP/IP.
Own contribution: implementation.

Jan 2005 - Dec 2005

1 year

Software package for TCP/IP transmission

A software package for TCP/IP transmission (as Delphi components) consisting of a multithreaded server and a client.
The server provides the following services: receiving binary data streams, storing data, logging events (client login/logout, data sent, data received, etc.).
Technologies: Delphi, Pascal, TCP/IP, multithreaded architecture, 3-layer.
Own contribution: architecture, implementation.

Jan 1998 - Dec 2008

11 years

Complex system for general practitioners

Scheduling visits, managing the patient database, digital patient files, diagnoses, medications, creating all necessary documents, reports for health insurance companies.
Developed an innovative editor for the digital patient file based on the WONCA ICPC principle.
The system was developed during this period and installed, deployed, and maintained in several medical practices.
Technologies: OOD/OOP, Delphi, Interbase/Firebird, Pascal, SQL.
Own contribution: design, architecture, implementation, testing, maintenance, sales.

Jan 1997 - Dec 2004

8 years

Object-oriented database for managing graphical and multimedia data in hospitals

Interfaces to all common image and video formats (JPG, DICOM, others) and medical devices.
Parser for HL7 files (version 2.x).
Modeling of workflows.
Search engine.
Dynamic generation of input forms using a custom scripting language.
Report generator.
Technologies: OOD/OOP, Delphi, Interbase, Pascal, SQL, HL7, DICOM.
Own contribution: architecture, implementation, tests.

Jan 1997 - Dec 1998

2 years

Backend for an online shop

Management of all processes from receiving customer orders, through full inventory management, supplier orders, FIFO concept, and document generation (stock lists, invoices, shipping labels, delivery notes, etc.).
Technologies: Delphi, Interbase, Pascal, SQL, stored procedures, triggers.
Own contribution: implementation.

Jan 1996 - Dec 1996

1 year

Szczecin, Poland

IT Manager

Tandem GmbH

Responsible for the introduction and maintenance of a complex solution for the leasing services sector.
Technologies: BackOffice Server, Interbase, Crystal Reports, LEO.
Own contribution: rollout, training, maintenance, configuration.

Jan 1995 - Dec 1997

3 years

Szczecin, Poland

Responsible for IT

Car dealership

Organized an inventory management system (introduced an external product) and a system for managing new car sales (own project).
Technologies: Delphi, Pascal, SQL, Windows, MS Access.
Own contribution: project management, implementation.

Jan 1992 - Dec 1995

4 years

Dortmund, Germany

Developer

Quantum

Created tool modules (programmed in C) for inventory management systems.
Mainly a report generator with an interpretable BASIC-like language to produce report sheets in the existing inventory management system, and a management information system.
Technologies: C, C++, lex/yacc, regular expressions, SQL, Unix.
Own contribution: implementation, tests.

Jan 1990 - Dec 1992

3 years

Berlin, Germany

Software Developer

Mikrodata

Responsible for developing transfer software for the Intel 80286 processor and frontend software for building management systems.
Technologies: Assembler, Pascal.
Own contribution: implementation.

Jan 1988 - Dec 1990

3 years