Ljubomir Obrenovic - Senior Test Automation Engineer

Q: Where is Ljubomir based?

Ljubomir is based in Munich, Germany and can operate in on-site , hybrid , and remote work models.

Q: What languages does Ljubomir speak?

Ljubomir speaks the following languages: Serbian (Native), German (Advanced), English (Advanced) .

Q: How many years of experience does Ljubomir have?

Ljubomir has at least 37 years of experience. During this time, Ljubomir has worked in at least 6 different roles and for 6 different companies . The average length of individual experience is 5 years and 7 months . Note that Ljubomir may not have shared all experience and actually has more experience.

Q: What is Ljubomir's latest experience?

Ljubomir's most recent position is Senior Software Test Engineer at Keil KTM GmbH .

Q: What companies has Ljubomir worked for in recent years?

In recent years, Ljubomir has worked for Keil KTM GmbH .

Q: Which industries is Ljubomir most experienced in?

Ljubomir is most experienced in industries like Automotive , Manufacturing , and Information Technology . Ljubomir also has some experience in Telecommunication , Healthcare , and Pharmaceutical .

Q: Which business areas is Ljubomir most experienced in?

Ljubomir is most experienced in business areas like Information Technology , Quality Assurance , and Product Development .

Q: Which industries has Ljubomir worked in recently?

Ljubomir has recently worked in industries like Automotive and Information Technology .

Q: Which business areas has Ljubomir worked in recently?

Ljubomir has recently worked in business areas like Information Technology , Quality Assurance , and Product Development .

Recommended expert

Munich, Germany

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Experience

Feb 2023 - Mar 2025

2 years 2 months

Munich, Germany

Senior Software Test Engineer

Keil KTM GmbH

Temporary employment

System black-box integration tests (BBIT, IVVQ): Execution of regression, release, acceptance, and compliance tests for safety-critical brake control units in the rail industry
Software test application & integration: Runtime configuration of software components and libraries, validation of interfaces, configuration dependencies, and component interactions
Test automation (FEAT framework): Co-development and further development of an automated test framework for test execution, reporting, and result analysis
Functional safety (SiL4, FuSi): Ensuring compliance with safety requirements, traceability and coverage, as well as standards compliance according to EN50126/28/29
Test automation for communication components: Configuration and validation of fieldbus (CAN) and Ethernet-based TCMS data communication interfaces (TRDP and CIP)
Requirements analysis & shift-left (PTC Windchill ALM): Analysis of software and system artifacts to identify gaps, ambiguities, and redundancies early in the SDLC
Test design & test case development: Derivation of test conditions, coverage strategies, and implementation of data-driven test cases (DDT), including reusable test data fixtures
CI/CD & automation (Python, PowerShell, Jenkins, SVN): Automation of build, test, and HIL deployment processes as well as integration into CI/CD pipelines
Test data & configuration management (XML): Maintenance and adaptation of XML test vectors and system configurations with automated integration into test environments
Non-functional testing: Execution of performance and load tests to assess stability and system behavior
Agile development & defect management (JIRA, Confluence): Participation in Scrum teams, test coordination, review of test artifacts, as well as defect tracking and root-cause analysis
Error analysis & debugging (CANoe, CANalyzer): Analysis of errors and message flows across multiple system layers (application to bus)
Model-based analysis (UML, Enterprise Architect): Specification of SUT/SOW and support for systematic test control
Process & test documentation: Creation of integration and test documentation according to internal quality and certification requirements

Jan 2022 - Present

4 years 7 months

Munich, Germany

Senior Test Automation Engineer

Generic & scalable Python-based test automation: (PyTest, asyncio, pytest-xdist, pytest-hooks, OOP DI, design patterns) for parallel and orchestrated test execution including quality gates and metric collection (execution, coverage, stability)
CI/CD-integrated build and test pipelines: GitLab/GitHub Actions and Jenkins (master/agent, JCasC), automated build validation, regression tests, and release management
Integration of quality gates: Security and code quality (SonarQube, Snyk), requirements coverage, and traceability in the automated test process
Containerized test execution: Docker for reproducible test environments in local, CI, and cloud test landscapes
Automated API, backend, and interface tests: Robot Framework, PyTest, REST (FastAPI), Postman, SQLAlchemy ORM, MQTT, and WebSockets
UI test automation: Robot Framework, Playwright, and Selenium WebDriver
Development of modular RIDE Python components: Robot Framework keywords and libraries to standardize and extend test automation
Generation and analysis of network communication: Scapy, PyShark, and Wireshark/TShark, packet analysis, protocol validation, and error diagnosis
Development of automated communication tests: Ethernet, IPv4, TCP, UDP, and MQTT (OSI layers 2, 3, 4, and 7)
Development of automated network validation: Communication paths, connection setup, timeout, load, and packet loss error scenarios
Detailed team analysis: Close collaboration with software development on the analysis of communication errors and troubleshooting
Test and defect management: Atlassian Xray, traceability of test results with Jira including structured test documentation
Building observability and quality metrics: Prometheus and Grafana for analyzing performance, stability, latency, and test coverage
Test reporting: JSON logs, Allure Reports, and JUnit XML for auditability, coverage analysis, and flakiness analysis
Secrets management: HashiCorp Vault in CI pipelines with zero-trust-based distribution of credentials
GitOps/ArgoCD: Collaboration with deployment environments to validate deployment stages in the test process

Jul 2008 - Jan 2023

14 years 7 months

Munich, Germany

Senior Software Test Engineer

Keil KTM GmbH

Freelance

Jan 2003 - Jul 2008

5 years 7 months

Ulm, Germany

Senior Software Test Engineer

Hays AG, TOPjects AG

Freelance

Python & Perl automation: Development and automation of white-box integration tests (WBIT) to improve the efficiency of protocol verification
3GPP compliance & protocol validation: Testing of NodeB base stations (UMTS/W-CDMA, LTE, Rel99 to HSDPA/HSUPA) through simulation of control and user data traffic
MATLAB & XML test vectors: Creation of structured test vectors for DSP tests and validation of outputs using Python automation
LTE component tests (UML/Eclipse/TTCN-3): Definition of scope of work (SOW), creation and execution of L2/L3 component tests, collection of coverage metrics for traceability
Data-driven testing (DDT): Management of datasets through preparation, validation, feeding, and recording for full test coverage
Test management (BaTMan): Performing error analyses, defect tracking, and problem solving to maintain product reliability
Version control (IBM Rational ClearCase): Management of testware versioning and configuration for a consistent workflow

Mar 2001 - Jul 2002

1 year 5 months

Munich, Germany

Software Configuration Management Engineer

Siemens AG

Perl, Csh, Bash (Solaris): Development of ClearCase trigger scripts for repository control and secure builds
CMake, GMake: Build configuration, dependency management, and software integration for embedded C/C++ systems; support for automated build verification and release processes
Rational ClearCase (MultiSite): Management of configuration and distributed version control
C++ / UML (OOA/D): Code and model reviews to ensure architecture and design compliance
FlexeLint: Use of static code analysis to enforce coding standards and code quality
Doxygen: Automation of documentation generation for maintainable technical references
Tornado IDE / VxWorks: Creation and deployment of embedded software on real-time systems

Nov 1997 - Mar 2001

3 years 5 months

Mississauga, Canada

Senior Software Development Engineer

BCE Emergis Inc.

POS/OLTP systems (HP Tandem NSK): Optimization of client/server architectures in terms of performance, efficiency, and reliability
Requirements engineering: Definition and documentation of software requirements in line with customer needs
C++, NonStop SQL, Rational Rose: Development of a Communication Interface Manager for OLTP processing and use case modeling
C, TAL, Embedded SQL/C (Sybase): Development of frontend/backend interfaces for host system integration
TCP/IP, X.25, SNA LU 6.2: Integration of communication protocols for reliable enterprise connectivity
NonStop SQL & IPC: Ensuring transaction integrity through optimized database and IPC processing
OLTP (Healthcare/Pharma): Optimization of interfaces for faster and more reliable billing processing

Nov 1996 - Nov 1997

1 year 1 month

Guelph, Canada

Software Test Engineer

Ositech Communications Inc.

Ethernet (10BaseT/100BaseT, MAC/LLC): Implementation of data-link layer protocols for stable communication
C / Assembler, PCI-PCMCIA, UART 16550: Development of low-level drivers for embedded systems and test applications
SoftICE Kernel Debugger: Analysis and fixing of kernel-level errors using root-cause analysis
PCMCIA Test Bed: Development of diagnostic tools for OEM validation of Ethernet devices
MS Visual C++ / WinSock: Development and testing of an echo server for performance and throughput validation
MS Visual SourceSafe: Management of version control and configuration for reliable releases

Jan 1988 - Jun 1995

7 years 6 months

Belgrade, Serbia

Senior Software Test / Development Engineer

Lola R&D Institute

C++, Quick Basic (HP 3000/GPIB): Development of test and measurement automation software to reduce manual effort
GPIB / HPIB programming: Control of digital test devices for automated, repeatable tests
HP & Tektronix instruments: Automation of logic analyzers, oscilloscopes, and pattern generators for validation and fault analysis
C++ / SCADA (HP 3000): Development of a SCADA application with integration of Modbus/RTU and HDLC/PLC protocols for industrial monitoring

Industry Experience

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

Experienced in Automotive, Manufacturing, Information Technology, Telecommunication, Healthcare, and Pharmaceutical.

Automotive

Manufacturing

Information Technology

Telecommunication

Healthcare

Pharmaceutical

Business Area Experience

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

Experienced in Information Technology, Quality Assurance, and Product Development.

Information Technology

Quality Assurance

Product Development

Summary

Technical core competencies

Test automation & test frameworks: Development, extension, and maintenance of scalable Python test frameworks with PyTest, pytest-xdist, pytest-hooks, asyncio, and OOP architecture (design patterns), scalable and parallel test execution
UI/API & backend test automation: Robot Framework (keyword-driven testing, development of reusable keywords and Python libraries), REST/FastAPI, Playwright, Selenium WebDriver, MQTT, WebSockets, Postman, SQL(Alchemy ORM) data consistency and interface validation
Communication & network testing: Automated validation of Ethernet-based communication systems from MAC to MQTT, industrial TCMS communication protocols (CIP & TRDP over TCP/IP)
Network analysis & protocol validation: Generation, analysis, and evaluation of network traffic with Scapy, tcpdump, PyShark, and Wireshark/TShark, packet analysis, error diagnosis, and protocol validation
CI/CD & continuous testing: Jenkins (master/agent setup, JCasC), GitHub Actions, GitLab CI, automated test integration, quality gates, requirements, test, execution, coverage, and stability metrics
Test stability & quality: Deterministic test methods, test isolation, timing control, flakiness reduction, reproducible test environments
Containerized test environments: Docker, Kubernetes, reproducible and scalable test infrastructures, zero-trust secrets management
Version control & DevOps: Git, GitHub, GitLab, Jenkins
Build, software integration, and component validation: Build validation in CI/CD pipelines (CMake/GMake), runtime configuration (MQTT), and validation of reusable software components and libraries
Agile software development & ALM: Scrum, Jira, Confluence, FEAT Framework, PTC Windchill ALM, Enterprise Architect (UML)
SiL/HiL tests & simulation: Model-based test design, fault injection, concurrency and system simulation in an embedded real-time context (mobile communications, ESRA)
Safety-critical software validation: Development and verification processes according to DO-178C comparable standards EN50126/28/29, requirements traceability, statement, branch, and MC/DC coverage
Performance & observability: Prometheus, Grafana, latency, throughput, and performance analysis, bottleneck detection
Logging & test reporting: JSON, Promtail, Loki, Allure Reports, JUnit XML, and Atlassian Xray Test Management
PLC/SCADA & automation: Process control in Python & CODESYS SoftPLC via OPC-UA & Modbus, EtherCAT simulation
Operating systems: Linux (Ubuntu, RHEL), Windows, Solaris (SunOS), HP-UX

Skills

Databases: Mysql, Postgresql; Sybase Sql; Hp Nonstop / Transact Sql
Programming Languages: Python, C/C++, Java, Perl
Protocols & Networks: Tcp/Ip, Ftp, Udp; Http; Rs-485, Modbus; Ethercat, Can; Trdp, Cip, Mvb; Lte / Wcdma / Umts; Ieee 488 Gpib

Languages

Serbian

Native

German

Advanced

English

Advanced

Education

University of Belgrade, Faculty of Electrical Engineering

Dipl.-Ing. (Diploma Engineer) · Electrical Engineering · Belgrade, Serbia

Certifications & licenses

Cyber Security IEC 62443 CLC/TS 50701 regulatory standards

Secura (Bureau Veritas company)

Advanced Python OOP

HP Tandem Guardian 90 NonStop kernel operating system

ISTQB CTFL

Standards EN 50126, EN 50128 and EN 50129 for functional safety in software and system development in the railway sector including RAMS strategies

TUEV Rheinland

UML concepts

Statistics

Experience

Total positions 8

Experience in Automotive 14.5 y

Avg length 5 y

Longest experience 14 y 6 m

Global Experience

Countries worked in 3 (Germany, Canada, Serbia)

Primary country Germany

Expertise

Recent roles Senior Software Test Engineer, Senior Test Automation Engineer, Software Configuration Management Engineer

Main industries Automotive, Manufacturing, Information Technology

Main business areas Information Technology, Quality Assurance, Product Development

Qualifications

Highest degree Master

Certifications earned 6

Profile

Created

July 2026

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Frequently asked questions

Have questions? Find more information here.

Where is Ljubomir based?

Ljubomir is based in Munich, Germany and can operate in on-site, hybrid, and remote work models.

What languages does Ljubomir speak?

Ljubomir speaks the following languages: Serbian (Native), German (Advanced), English (Advanced).

How many years of experience does Ljubomir have?

Ljubomir has at least 37 years of experience. During this time, Ljubomir has worked in at least 6 different roles and for 6 different companies. The average length of individual experience is 5 years and 7 months. Note that Ljubomir may not have shared all experience and actually has more experience.

What roles would Ljubomir be best suited for?

Based on recent experience, Ljubomir would be well-suited for roles such as: Senior Software Test Engineer, Senior Test Automation Engineer, Software Configuration Management Engineer.

What is Ljubomir's latest experience?

Ljubomir's most recent position is Senior Software Test Engineer at Keil KTM GmbH.

What companies has Ljubomir worked for in recent years?

In recent years, Ljubomir has worked for Keil KTM GmbH.

Which industries is Ljubomir most experienced in?

Ljubomir is most experienced in industries like Automotive, Manufacturing, and Information Technology. Ljubomir also has some experience in Telecommunication, Healthcare, and Pharmaceutical.

Which business areas is Ljubomir most experienced in?

Ljubomir is most experienced in business areas like Information Technology, Quality Assurance, and Product Development.

Which industries has Ljubomir worked in recently?

Ljubomir has recently worked in industries like Automotive and Information Technology.

Which business areas has Ljubomir worked in recently?

Ljubomir has recently worked in business areas like Information Technology, Quality Assurance, and Product Development.

What is Ljubomir's education?

Ljubomir holds a Master in Electrical Engineering from University of Belgrade, Faculty of Electrical Engineering.

Does Ljubomir have any certificates?

Ljubomir has 6 certificates. Among them, these include: Cyber Security IEC 62443 CLC/TS 50701 regulatory standards, Advanced Python OOP, and HP Tandem Guardian 90 NonStop kernel operating system.

What is the availability of Ljubomir?

Ljubomir is immediately available full-time for suitable projects.

What is the rate of Ljubomir?

Ljubomir's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.