Robert Raźniewski - Software Developer

Szczecin, Poland

Experience

Feb 2025 - Present

1 year

Software Developer

Fima Maschinenbau GmbH

Further development of an internal application.
Adapting existing functionality, bug fixing, and developing new features.
Multithreading, technical calculations in fluid dynamics, graphics, data import/export, reading data from measuring devices in separate threads.
Delphi 12, FireDAC, parallel programming, multithreading, communication over IP and serial bus.
Development, bug fixing, testing, documentation.

Jul 2024 - Apr 2025

10 months

Software Developer

Maenken Systems

Development of a data transfer system for ARM architecture using Lazarus and client software with Delphi.
Delphi, Lazarus, ARM, cross compiling, multithreading, REST, HTTP, Git, GitLab.
Architecture, analysis, development, testing, documentation.

Jan 2024 - Dec 2025

2 years

Germany

Instructor

German Navy Shipyard

As an instructor, led several courses on Delphi/Firebird (introductory, advanced, complex topics) for employees of a German Navy shipyard.
Designed the training, delivered it, advised on database and software architecture questions.
Delphi 12, FireDAC, Firebird.
Training, consulting, idea generation.

Sep 2023 - May 2024

9 months

Software Developer

MyWarm

Development of a software system for optimizing energy distribution in heating systems.
PHP, MySQL, Bitrix, Git, GitLab.
Architecture, analysis, development, testing, documentation.

Jun 2023 - Feb 2024

9 months

Vienna, Austria

Architecture Consultant

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

Consulting on architecture, performance, deployment, and interfaces in Section V: Environment and Circular Economy.
Java, Spring, OpenAPI, Python, Jira, Confluence, Camunda, GitHub, ITIL.
Architecture, analysis, requirements analysis, new concepts, consulting, UX testing, documentation.

Feb 2022 - Nov 2022

10 months

Software Developer

Immobilien Service Deutschland

Developed new features in Dispotafel, a tool for planning cleaning and service assignments.
Designed and redesigned the user interface.
Conceptualized and implemented the SOAP client for the pay and commission calculator.
Defined the WSDL file, database interface, and data migration.
Delphi 10, 11, Informix, Firebird, Java, Maven, SOAP, DevExpress, JCL, TMS, GitHub.
Development, testing, documentation.

Nov 2021 - Mar 2022

5 months

Lead Developer / Coach

Bayer CropScience

Further development of a mobile application and its backends for farmers to calculate fertilizer and fungicide quantities.
Analyzed the existing solution and backlog.
On the backend: replaced a monolith, implemented microservices.
On the frontend: adjusted the user interface based on product owner requirements.
Implemented a Kafka client and expanded unit tests.
Handed over the project to a developer team, supported the team, and documented the process.
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.
Architecture, analysis, requirements analysis, lead developer, testing, documentation, team support during takeover of 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 WWS.
Analyzed data formats and designed the ORM models.
Conceptualized and implemented a converter for data import and export.
Designed and implemented a backend application and expanded unit tests.
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.
Architecture, lead developer, analysis, requirements analysis, testing, performance and load testing, middleware implementation, documentation.

Jan 2021 - May 2023

2 years 5 months

Vienna, Austria

System Administrator / Consultant

Stadtamt Wien

Configured, customized, and tested web servers, load balancers, and the CraftCMS environment.
Wrote documentation, provided advice on architecture and performance.
PHP7, Laravel, Nginx, RedHat Linux, CraftCMS, Docker, Kubernetes, Terraform, Jira, Confluence, GitHub, ITIL.
Architecture, analysis, configuration, consulting, testing, documentation.

Feb 2020 - Present

6 years

Software Developer

Privatprojekt

Smart Home project with Arduino and Raspberry Pi, developed a central server and multiple clients for the smart home system.
Acted as a sandbox for new technologies: architecture, development, deployment, and testing of clients, servers, and frontends in a heterogeneous environment with event-driven architecture.
Designed database architecture and optimized database queries.
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.
Architecture, requirements analysis, development, testing, TDD, BDD, deployment, maintenance, DevOps, Terraform, Docker, Kubernetes, preparing and maintaining pipelines for testing and rollout.

Feb 2020 - Sep 2022

2 years 8 months

Hanover, Germany

Lead Developer

Central Police Directorate of Lower Saxony

Upgraded a legacy system (managing internal resources, applications, events, data transfer and backup, reports) from PHP 5 to PHP 7.
Performed static analysis of the codebase and identified parts of the code that needed refactoring.
Implemented a new database interface and adapted external interfaces.
Designed and implemented objects to replace the existing logic.
Removed global variables, wrote unit tests and integration tests, and fixed bugs.
Managed security identification via a REST API.
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.
Architecture, analysis, requirements analysis, upgrade of a legacy system from PHP5 to PHP7, lead developer, refactoring, testing, TDD, middleware implementation, migration, documentation.

Dec 2019 - Jan 2020

2 months

Backend Developer

Aboutyou.com

Backend development of a retail platform.
Analyzed weaknesses in the transaction system and designed countermeasures.
Developed a module to calculate delivery times based on order data, delivery addresses, and carriers.
Developed a Google Analytics module and expanded unit tests.
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.
Analysis, refactoring, development, debugging, testing, unit tests, performance and load testing.

Jan 2019 - Nov 2019

11 months

Hamburg, Germany

Software Developer / Scrum Coach

Stulz

Developed a service management platform.
Developed an import tool for customer master data and new features for the deployment calendar.
Developed a REST client, implemented a tracking module and unit tests.
PHP7, Laravel, MySQL, Eloquent, Microservices, PHPStorm, Bootstrap, REST, JSON, Angular, Typescript, jQuery, Docker, XML, SCRUM, Agile, Git, GitHub, PHPDoc, Design Patterns.
Analysis, refactoring, development, middleware implementation, Scrum coaching.

Sep 2018 - Dec 2018

4 months

Software Developer

Skon.de

Developed a platform for rewards management in retail.
Developed a price and rewards calculator that serves as a REST server.
Implemented unit tests.
PHP7 (PHP7.2), MySQL, JavaScript, Angular, Typescript, Bootstrap, PHPStorm, REST, JSON, XML, OAuth2, SCRUM, Git, Bitbucket, Docker, Kubernetes, internal framework based on Symfony 4, Twig, PHPDoc.
Analysis, refactoring, development.

Sep 2018 - Nov 2018

3 months

Lead Developer / Architect

Agrora.market

Developed a prototype of an agriculture trading platform up to the live version.
Architected and developed the platform in both frontend and backend.
Developed a REST client for the exchange servers' APIs.
Implemented unit tests.
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.
Architecture, requirements analysis, refactoring, development, testing, unit tests, UX tests, setting up CI/CD pipelines, Scrum coaching, lead developer.

Sep 2018 - Oct 2018

2 months

Software Developer

Mobilcom-debitel

Co-development, Refactoring and Bugfixing of the existing backend system for shop billing.
Migration of the codebase from Delphi 5 to Delphi Berlin.
Development of modules for price calculation, inventory calculation and data synchronization between the central server and shops.
Delphi Berlin, Delphi 5, Firebird, IB Expert, UniDAC, FastReport, C#, .NET, XML, SOAP, GitHub, JIRA, SCRUM.
Analysis, Refactoring, Development.

Jun 2018 - Aug 2018

3 months

Software Developer

Optica.de

Co-development and Refactoring of the existing backend system for health insurance billing.
Development of modules for delivering data on provided services as XML files.
Refactoring a Monolith towards Microservices and Implementation of Unit Tests.
PHP5, Zend, MySQL, JavaScript, Angular, Typescript, Redmine, SVN, SVN Hook Scripts, PHPStorm, REST, JSON, Docker, Kubernetes, Refactoring, XML, SCRUM.
Analysis, Refactoring, Development, Legacy Code Enhancement.

Apr 2018 - Jun 2018

3 months

Software Developer

Finanzcheck.de

Development and Refactoring of the existing backend system for loan consulting.
Development of a price and interest comparison platform for banking products.
PHP5, Symfony3, MySQL, Propel, MongoDB, Grafana, JavaScript, Jira, Git, Bitbucket, PHPStorm, REST, JSON, XML, SCRUM, Docker, Kubernetes, PHPDoc.
Analysis, Refactoring, Development.

Mar 2018 - May 2018

3 months

Lead Developer / Architect

Yas.life

Design and Architecture of a multi-tenant backend environment for a fitness app.
Implementing guidelines for the development team and adjusting the database.
Supporting the development team.
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.
Architecture, Requirements Analysis, Refactoring, TDD, Lead Developer.

Sep 2017 - Mar 2018

7 months

Software Developer

DBConnect

Development, Refactoring and Bugfixing in a booking/tracking system for Car Sharing and City Bikes.
Implementation of a price calculator as a SOAP server.
PHP4, PHP5, MySQL, Jira, SVN, Git, PHPStorm, JavaScript, Typescript, REST, XML, JSON, Docker, Smarty, SCRUM.
Development, Code Reviews, Analysis, Refactoring (from Monolith to Microservices), Legacy Code Enhancement, Tests, Unit Tests, UX Tests, Debugging.

Oct 2016 - Aug 2017

11 months

Backend Developer / Architect

AirBerlin

Development, refactoring, and optimization of a new version of the booking/tracking system for airports (shopping, booking, payment).
Intensive use of SCRUM/SAFe.
Development of interfaces to external systems (Amadeus, Comarch, Sixt) and server-side programming for the frontend.
Import/export of loyalty program cards using batch programming and cron jobs.
Security identification management via a REST API.
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, Scrum SAFe, JavaDoc, Maven, Docker, Kubernetes, Design Patterns.
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 / Architect / Scrum Master

Rieber.de

Development of an intelligent food-flow system according to HACCP rules.
Backend services accessible through a cockpit and mobile apps.
Refactoring of the cockpit using AngularJS in a responsive design paradigm.
Implementation of asynchronous calls for various sensors to report temperatures.
Symfony controller with a REST interface for XML/JSON data transfer.
Frontend adjustments using HTML, CSS, JavaScript, and preparing pipelines for rollout.
PHP (PHP5), Symfony2, 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.
Architecture, lead developer, creating project plans, code reviews, analysis, refactoring, legacy code migration from monolith to microservices, tests, debugging, setting up and maintaining CI/CD and Docker pipelines, Scrum master, Scrum coaching.

Jan 2015 - Apr 2015

4 months

Software Developer

Modix.de

Various development tasks within the client's system.
PHP, Zend, MySQL, Jira, SVN, Zend Studio, Docker, Smarty.
Development, code reviews, analysis, refactoring, legacy code migration, tests, debugging.

Oct 2014 - Dec 2014

3 months

Software Developer

Clickbus.de

Co-development of a price comparison platform and a booking portal for long-distance bus travel.
Fetching price lists through REST and SOAP interfaces.
Development of new features, debugging, code reviews.
PHP, Symfony2, MySQL, OAuth2, LDAP, Twig, PHPUnit, PHP Code Sniffer, jQuery, SOAP, REST, Microservices, Docker, Kubernetes, Jira, SCRUM, PHPDoc.
Development, refactoring, debugging.

Jun 2014 - Sep 2014

4 months

Software Developer

Modix.de

Migration of a trading tool for new and used cars from ISO to UTF-8.
Adjusting relevant functions in the code and interfaces to external systems.
PHP4+5, Zend, MySQL, Jira, LDAP, REST, SVN, Zend Studio, Smarty, Docker.
Code reviews, analysis, refactoring, legacy code migration, tests.

Jan 2014 - May 2014

5 months

Karlsruhe, Germany

Backend Developer

Flagbit.de

Backend development for a billing system for energy supply.
Input and reading of price lists via a REST API.
Documenting the interface with Swagger.io.
PHP, Symfony2, Doctrine, YAML, Twig, REST, Swagger.io, Angular, Typescript, Jenkins, Git, Jira, Plan.io, Docker, PHPStorm, PHPDoc, Sphinx, Confluence.
Development, testing.

Dec 2012 - Nov 2013

1 year

App Developer

Naturheilpraxis

Development of an iOS app for scheduling patient visits (calendar).
Objective-C, iOS, OOD/OOP, SCRUM, Xcode.
Scrum member, implementation.

Nov 2012 - Nov 2013

1 year 1 month

Wolfsburg, Germany

Software Architect / Developer

Volkswagen AG

Design and architecture of a report generator for a module database.
Defining reports with YAML scripts, engine in PHP5.
Graphical mapping of module structures and process flows.
Implementation of a PDF generator and a REST client for data transfer to a DMS server.
Maintaining an archive of module images.
OOD/OOP, PHP, MySQL, YAML, UML, REST, Regular Expressions, Wiki, OTRS, SVN, SVN hook scripts, archive (internal VW DMS).
Architecture, implementation, testing.

Nov 2011 - Oct 2012

1 year

Software Architect / Developer

Fabrykagier.pl

Development of a universal interface between the frontend and social portals (Facebook, Google+).
Defining game assets and measuring the backend load.
Automatic launching of cloud servers and modules for monetization.
Architecture and development of a lightweight MVC framework for performance.
OOD/OOP, UML, PHP5, Apache, Nginx, REST, MVC, JSON, MySQL, MongoDB, Memcached, Jenkins, SVN, GitHub, TDD, Unit Tests, Facebook API, HTML, CSS, SCRUM, Eclipse, NetBeans.
Scrum member, concept, architecture, implementation.

Mar 2010 - Mar 2011

1 year 1 month

Backend Developer

Vivio.pl

Architecture and implementation of the backend for a Facebook game.
Design of a sharded database in the Amazon Cloud.
Implementation of communication between the frontend (Flash) and backend using AMF.
OOD/OOP, PHP, Zend, Apache, SQL, REST, AWS, EC2, Sharding, AMF, UML, Basecamp, SVN, SCRUM, Eclipse.
Scrum member, architecture, implementation, testing.

Feb 2009 - Mar 2010

1 year 2 months

Software Architect

Baulabor

Workflow system project for a construction testing lab.
OOD, UML.
Architecture.

Mar 2007 - Mar 2010

3 years 1 month

Szczecin, Poland

Project Manager / Software Architect

Espol.pl

Project, implementation, and maintenance of a web-based billing system for triple-play billing.
Generating quotes, contracts, invoices, and importing bank statements.
Generating configuration files for Access Servers and Access Points.
Access and shape control via RADIUS and mapping the topology.
OOD/OOP, PHP4+5, MySQL, HTML, CSS, JavaScript, Wiki, Redmine, UML, Design Patterns, Smarty, SVN, MVC, RADIUS, REST, SOAP, XML, Eclipse.
Concept, architecture, implementation, tests, maintenance, project management.

Jan 2006 - Dec 2007

2 years

Consultant / Software Architect

Institut für Paläobiologie

Consulting on building a database of animal species and integrating existing archives.
Creating an architecture for long-term use of the knowledge base through continuous migration.
DMS, various File System Archives, MediaWiki, Migration Scripts.
Design, architecture, consulting.

Jan 2006 - Dec 2006

1 year

Szczecin, Poland

Software Developer

Hausärzte

Porting a system for general practitioners to PHP5 (patient database, calendar, digital patient record, report generator).
Taking over, converting, and cleaning patient data from a mainframe for new private clinics.
PHP, MySQL, HTML, JavaScript, Mainframe, File System, Refactoring.
Implementation, migration.

Jan 2006 - Dec 2006

1 year

Software Developer

IIS/ISAPI

Development of a content management framework based on IIS/ISAPI.
Delphi, Pascal, IIS.
Development, testing.

Jan 2005 - Dec 2005

1 year

Software Developer

City Courier Company

Developed a module in a database application to manage orders and courier dispatch.
Delphi, Pascal, TCP/IP.
Implementation.

Jan 2005 - Dec 2005

1 year

Software Developer

IIS

Developed a mail tool to store and send emails from a web framework.
Logged events and created reports.
Developed an admin panel in PHP4.
OOD/OOP, Delphi, Pascal, Interbase, SQL, HTTP, PHP.
Implementation.

Jan 2005 - Dec 2005

1 year

Software Developer

Optics Workshop

Developed a 3-layer application for an optics workshop.
Data modeling, implementation of stored procedures, user interface and application server.
Developed the transmission protocol.
OOD/OOP, Delphi, Pascal, Firebird, SQL, HTTP, TCP/IP, 3-Layer.
Implementation.

Jan 2005 - Dec 2005

1 year

Software Architect / Developer

TCP/IP Transmission

Developed a software package for TCP/IP transmission as Delphi components.
Multithreaded server for binary data streams with event logging.
Delphi, Pascal, TCP/IP, Multithreaded Architecture, 3-Layer.
Architecture, implementation.

Jan 1998 - Dec 2008

11 years

Software Architect / Developer

General Practitioner System

Developed a complex system for general practitioners (visit management, patient records, medications, reports).
Innovative editor for digital patient records based on the WONCA ICPC principle.
OOD/OOP, Delphi, Interbase/Firebird, Pascal, SQL.
Concept, architecture, implementation, testing, maintenance, sales.

Jan 1997 - Dec 2004

8 years

Software Architect / Developer

Hospitals

Object-oriented database for managing graphical and multimedia data.
Interfaces to image formats (DICOM, JPG) and medical devices.
Parser for HL7 files, search engine, and dynamic input forms.
OOD/OOP, Delphi, Interbase, Pascal, SQL, HL7, DICOM.
Architecture, implementation, testing.

Jan 1997 - Dec 1998

2 years

Software Developer

Online Shop

Backend development for an online shop to manage inventory, ordering, and document generation.
Delphi, Interbase, Pascal, SQL, Stored Procedures, Triggers.
Implementation.

Jan 1996 - Dec 1996

1 year

Szczecin, Poland

IT Manager

Tandem GmbH

Introduced and maintained a complex solution for the leasing division.
BackOffice Server, Interbase, Crystal Reports, LEO.
Deployment, training, maintenance, configuration.

Jan 1995 - Dec 1997

3 years

Szczecin, Poland

IT Manager

Car Dealership

Organized an inventory management system and developed a system for new car sales.
Delphi, Pascal, SQL, Windows, MS-Access.
Project management, implementation.

Jan 1992 - Dec 1995

4 years

Dortmund, Germany