Freelancer profile translated to English.

Description

My focus is on software design and development in C++, network programming, client-server applications, multithreading, high availability, high-performance/low-latency systems, library development, refactoring, and modernization of complex software.

I am also happy to take on training/coaching tasks in the area of Modern C++ as part of projects and generally try to provide impulses for modernization/improvement at all levels. Occasionally, I also gave seminars and workshops on Git, Git Migration, and Git Workflows.

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Frankfurt am Main (up to 50km), Frankfurt am Main (up to 30km)

Panthera Investment GmbH / CMT Capital Markets Trading
Architecture / Software Development C++
May 2024 - February 2026 (1 year and 9 months)
Frankfurt am Main, Germany
Tasks:
As part of supporting the development team of an investment firm, I was responsible for the modernization and further development of several central desktop and backend applications used by traders (C++/Qt):
Design and implementation of a new backend for outsourcing all SQL accesses from the inventory software (gRPC-based communication).
→ Significantly improved performance by bundling database accesses and backend proximity to the DB.
Fundamental revision of the central internal data structures
Harmonization and migration of local configuration files to a centralized Configuration Service, including fallback and migration mechanisms
→ Simplified deployment and reduced maintenance effort.
Replacement of proprietary logging solutions with spdlog
→ Uniform, performant, and maintainable logging.
Performance and stability improvements through increased use of asynchronicity, multithreading, and pre-loading.
Integration of web views for displaying web-based charts and visualizations within the desktop applications.
Implementation of new features and usability improvements in close coordination with the users (traders).
Sustainable code modernization:
- Switch to C++20
- Modularization / development of reusable libraries
- Runtime to Compile-time checks (e.g., dedicated types instead of primitive data types).
- Improvement of testability and maintainability
- Reduction of macros
- Increase of compiler warning levels
Increased use of Cursor Agents (particularly effective for extensive refactorings).

Technologies / technical focus:
C++20, Qt 6.5, boost, boost::asio, Multithreading, TMP, gRPC, Protobuf, spdlog, googletest, CMake, OAuth2, SQL, Kubernetes, Ansible, Podman, Docker, Conan,
Cursor, AI Agents, ChatGPT, Linux, Windows, WSL, git, GitLab, Slack, Jira, Architecture, Protocol Design, Refactoring, Backend Programming, GUI Programming
C++ Qt Multithreading Refactoring AI Agents
SKS-Kinkel GmbH
Architecture / Software Development C++
June 2023 - March 2024 (9 months)
Tasks:
My main task was the design and implementation of the software for the parcel locker "COMFORTbox" in C++. The entire backend application, large parts of the frontend application, and the protocol definition for their communication were entirely my responsibility. Furthermore, I developed (further) several library components (DB components, MQTT client, helper classes for easy implementation of task queues, subscribe-notify helpers, conversion functions, ...), and updated and further developed the integration test environment created by me for SKS in 2020/21: integration of new applications, addition of an interactive test mode, generalization of test case "expectations" (conceptually similar to googletest matchers), massive acceleration of test execution, numerous new test cases.

Technologies / technical focus:
C++17, boost, Multithreading, CMake, MQTT, paho.mqtt.cpp, spdlog, soci, LVGL (Light and Versatile Graphics Library ), googletest, googlemock, python, shell-scripting, mosquitto, MariaDB, SQL, Wireshark, Linux, git, Docker, GitLab Enterprise, Architecture, Refactoring, Coaching, Test Automation
C++ Docker Test Automation MQTT C++17
DSA Daten- und Systemtechnik GmbH
Architecture / Software Development C++
AUTOMOBILE
September 2022 - February 2023 (5 months)
Tasks:
In the PRODIS.Server team, I was responsible for the design and implementation of several REST/HTTP services in the context of flash data management in the vehicle production of major German automakers.
Furthermore, I supported the migration to a newer C++ language standard and trained the team in unit testing with googletest/googlemock.

Technologies / technical focus:
C++17, Visual Studio Code, Linux (SLES, RHEL), XML, XSD, JSON, SQL, Postgres, Oracle, REST, HTTP, googletest, googlemock, boost, rapidjson, jsoncpp, Cmake, Insomnia, git, Visual Studio Code, Training/Coaching, Polarion, Scrum, Interface Development, Database Design
C++ REST Coaching Back-End development Linux

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Computer Science Diploma (Final Grade "Very Good")
Johann Wolfgang Goethe University, Frankfurt
2006

OMG Certified UML Professional Foundation Level
OOSE, Hamburg
2010
Certified ScrumMaster
SIGS Datacom
2011

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Holger Biehl

Senior C++ Developer

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