Robert Malec - Backend Developer for Payment Systems

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Darmstadt, Germany

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Experience

Mar 2025 - Present

1 year 7 months

Backend Developer

Payment Backend

Integration of partner systems in the payment and credit card environment.
Development, deployment, and monitoring in a large system landscape.
Use of a wide range of customer-specific frameworks and tools.

Jan 2024 - Dec 2025

2 years

Architect, Backend Developer

Cashback App

Technical design and implementation of an MVP: app for cashback payments for relevant activities on Instagram.
Monitoring of activities, billing with companies and influencers depending on reach.

Jan 2022 - Dec 2025

4 years

PO, Architect, Developer

Algotrading Engine

Concept and implementation of a platform for algo trading based on futures.
Connection to several crypto exchanges for execution and to TradingView for chart analysis.
Active automatic money management.

Sep 2018 - Sep 2019

1 year 1 month

Business Analyst, Coach

Advertising Token

Concept of a business model combined with the launch of our own cryptocurrency.
Design of a migration strategy based on PayPal to a hybrid of utility and security token.
Help with creating tokenomics and the whitepaper.

May 2018 - Sep 2023

5 years 5 months

CTO, Architect, Team Lead, Business Analyst, Developer

Tokenisation Platform

Concept, architecture, and technical leadership for several portals for tokenizing assets using blockchain technology.
Implementation of legal rules as rule stacks in a rule engine.
Design of BPMN workflows and operation on the Camunda workflow engine.
Definition of use cases and creation as BPMN processes, as well as the related test coverage.
Integration of external services such as custodian service, KYC, and AML.
Porting to a white-label solution and interface coverage with REST.

Jun 2015 - Mar 2019

3 years 10 months

Developer, Architect, Team Lead

Lending Platform

Further development of a portal for loan application, review, approval, and loan and risk monitoring.
Go-live on the US market.
Design and implementation of a framework for dynamically generating the GUI based on metadata (interpreter).
Leading an international team responsible for front-end development and third-level support.

Mar 2015 - Jun 2015

4 months

Developer

SLA Monitoring

Further development of a portal for visualizing analysis data from monitored application and server infrastructures.
GWT GUI for displaying flash-based charts and user management.

Aug 2013 - May 2014

10 months

Designer, Developer

Invoice-EDI

Modernization and refactoring of the EDI platform for invoice data, including the proprietary RuleEngine.
Adaptation of the solution for use by new customers and countries, including go-live.
Introduction of test coverage.

Apr 2013 - Jul 2013

4 months

Developer

Bausparrechner

Migration of a home savings calculator developed on a Struts basis to plain GWT.
Integration of MVP and editor framework as well as mailings and PDF generation.

Sep 2012 - Feb 2013

6 months

Developer

Energy Volume Management

Further implementation of a portal for managing energy volumes.
GUI for splitting into supply components, aggregation and determining tranches, as well as commissioning suppliers.
BPMN workflows to implement business processes.

Jan 2011 - Jul 2012

1 year 7 months

Architect, Designer, Developer, Coach

NOTAM/Briefing-Office

Reimplementation of a portal for managing TAM messages (NOTAM, SNOWTAM, ASHTAM).
GUI-based creation and sending of NOTAMs via AFTN and EAD interfaces, as well as mapping to AIXM data.
Development of the Briefing Office for generating and managing PIBs.
Development of the test framework.

May 2009 - Jan 2011

1 year 9 months

Developer

SLA-Monitoring

Reimplementation of a portal for visualizing evaluation data from monitored application and server infrastructures.
GWT GUI for displaying flash-based charts and user management.
Implementation of a caching mechanism using an embedded database and scheduling.
Setup and maintenance of the development and deployment infrastructure.

Feb 2008 - Mar 2009

1 year 2 months

Architect, Designer, Developer, Coach

Auditverwaltung

Expansion of a system for capturing and managing audits.
Concept, implementation, and coaching of team members.
Maintenance of operations and migration.

Aug 2007 - Feb 2008

7 months

Designer, Developer

Kreditkartenbestellsystem

Expansion of a credit card management system for the market launch of a new product (prepaid credit card).
Workflow and backend development plus integration with partner systems.

May 2007 - Jul 2007

3 months

Designer, Developer

OSS-Provisionierungssystems

Concept (redesign) and implementation of an OSS provisioning system.
Frontend development and backend update.

Nov 2006 - May 2007

7 months

Designer, Developer

Business component of a mail repository

Conceptual design and implementation of the business layer of a mail repository for an internet communications provider as a Java API.
Conceptual design and implementation of a frontend library and the IO connection to ICE servers.

Sep 2005 - Oct 2006

1 year 2 months

Architect, Designer, Developer

Claims processing system for a claims adjuster

Conceptual design of the orchestration and implementation of a claims settlement system.
Feasibility study as a BPM project based on an SOA.

May 2004 - Jul 2005

1 year 3 months

Architect, Designer, Developer

Management tool for editorial documents

Conceptual design and implementation of a tool for the automated processing and management of video recordings and editorial documents.
Implementation of the DOM structure and GUI design.

May 2003 - Oct 2003

6 months

Designer, Developer

Data viewer for market research results

Conceptual design and implementation of a web-based data viewer for market research results.
Design and implementation of the middleware and the web frontend.

Dec 2002 - Apr 2003

5 months

Developer

Supplier evaluation system for the automotive industry

Implementation of database import processes, thread handling for complex server processes, and the client GUI.
Implementation based on frameworks already developed.

May 2002 - Sep 2002

5 months

Designer, Developer

Survey and Analysis System for Market Data in the Electrical Industry

Concept and implementation of a web-based survey and analysis system.
Design and implementation of the EJB architecture.

Jun 2000 - Jul 2001

1 year 2 months

Designer, Developer

Claims Processing System for the Insurance Industry

Concept and implementation of a web-based claims processing system.
Development of our own persistence, business, and servlet layers on Apache/Tomcat.
Integration and connection to various partner systems.

Jan 2000 - Apr 2000

4 months

Coach, Project Manager

Delivery System for Market Research Results

Concept and implementation of a web-based delivery system for market research results in the pharmaceutical industry.
Training of the development team.

Jan 1999 - Jun 1999

6 months

Project Manager, Designer, Developer

Extension of an Editorial Environment

Implementation of a web-based editorial environment with consistency checks.
Integration into already developed document management systems and web servers with our own servlet engine.

Jun 1998 - Dec 1998

7 months

Designer, Developer

Recording and Management System for Deployment Data

Implementation of a client-server system for recording and maintaining employees' deployment data.

Feb 1998 - Jun 1998

5 months

Project Lead, Designer, Developer

Document Capture and Delivery System

Design and implementation of a web-based ordering interface for delivering administrative documents.
Management of data for data centers and participant facilities.
Development of a server.

Oct 1997 - Dec 1997

3 months

Developer

Online Shop

Implementation of an order system for products of the metal industry.

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Banking and Finance, Information Technology, Insurance, Aerospace and Defense, Professional Services, and Advertising.

Banking and Finance

Information Technology

Insurance

Aerospace and Defense

Professional Services

Advertising

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Finance, Quality Assurance, Operations, and Project Management.

Information Technology

Product Development

Finance

Quality Assurance

Operations

Project Management

Skills

Industry Experience

Finance/Banking
Air Traffic Control
Automotive
Internet/Isp
Telecommunications
Retail
Energy Industry

Programming Languages

Java
Python
Bpmn
Sql
Pl/Sql, Solidity, Javascript, Typescript, C, C#, C++ …

Application Areas

Data Maintenance Systems, Editorial Systems, Ordering Systems, Srm, Audit Management, Lending, Edi, Communication Systems, Tokenization Platform, Escrow Solutions, Asset Management, Blockchain Integration, Smart Contracts, Trading Engines

Tools

Figma, Miro, Confluence, Jira, Trello, Asana
Ci/Cd: Github, Gitlab, Visual Source Safe (Microsoft), Cvs, Svn, Clearcase, Continuus, Maven, Aws, Jenkins, Docker, Docker Compose
Development Environment: Eclipse, Remix, Visual Studio Code, Oracle Bpel Designer, Wsad, Activiti, Camunda Modeler, Together/J, Rational Rose, Enterprise Architect, Magic Draw
Databases: Informix, Oracle, Mysql, Mariadb, Sybase, Postgresql, Db2, H2
Tomcat, Bea Weblogic, Websphere, Jboss, Springboot, Flask
Frameworks: Axis, Cxf, Struts, Jsp, Jsf, Log4j, Cocoon, Ant, Maven, Junit, Selenium, Common.Controls, Gwt, Gxt, Hibernate, Spring, Springboot, Kafka, Mybatis
Drools, Camunda Bpm
Toad, Oracle Bpel Designer, Oracle Developer, Tora, Pgadmin, Openlayers, Squirrel, Dbeaver

Languages

German

Advanced

English

Advanced

Polish

Advanced

Russian

Advanced

Education

Oct 1988 - Jun 1997

Karlsruhe Institute of Technology (KIT)

Diploma in Computer Science · Computer Science · Karlsruhe, Germany

High School Diploma · Germany

Statistics

Experience

Total positions 27

Experience in Banking and Finance 12 y

Avg length 1 y 2 m

Longest experience 5 y 4 m

Expertise

Recent roles Backend Developer, Architect, Backend Developer, PO, Architect, Developer

Main industries Banking and Finance, Information Technology, Insurance

Main business areas Information Technology, Product Development, Finance

Qualifications

Profile

Member since

September 2025

Last update

September 2026

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Frequently asked questions

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Robert is based in Darmstadt, Germany.

Robert speaks the following languages: German (Advanced), English (Advanced), Polish (Advanced), Russian (Advanced).

Robert has at least 25 years of experience. During this time, Robert has worked in at least 13 different roles and for 27 different companies. The average length of individual experience is 1 year and 11 months. Note that Robert may not have shared all experience and actually has more experience.

Based on recent experience, Robert would be well-suited for roles such as: Backend Developer, Architect, Backend Developer, PO, Architect, Developer.

Robert's most recent position is Backend Developer at Payment Backend.

In recent years, Robert has worked for Payment Backend, Cashback App, Algotrading Engine, and Tokenisation Platform.

Robert is most experienced in industries like Banking and Finance, Information Technology, and Insurance. Robert also has some experience in Aerospace and Defense, Professional Services, and Media and Entertainment.

Robert is most experienced in business areas like Information Technology, Product Development, and Finance. Robert also has some experience in Quality Assurance, Project Management, and Operations.

Robert has recently worked in industries like Banking and Finance and Information Technology.

Robert has recently worked in business areas like Information Technology, Product Development, and Operations.

Robert attended Karlsruhe Institute of Technology (KIT) for Computer Science.

The availability of Robert needs to be confirmed.

Daily rate distribution

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<€640 €720-800 €800-880 €960+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

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Daily rate avg. 764 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

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Median rate 776 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.