Esmail Saberi - Senior Load and Performance Tester

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Düsseldorf, Germany

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Experience

Feb 2022 - Dec 2025

3 years 11 months

Senior Load and Performance Tester

Deutsche Bahn (DB-Netz)

Design, development, and execution of load and performance tests for the PRISMA project
Use of Apache Jmeter, Gatling, Apache ActiveMQ, Jms/Tibco Ems, SikuliX, Jython, Amazon AWS, PAN-Client
Methods: load tests, test automation

Oct 2021 - Dec 2021

3 months

Senior Tester

Baader Bank

Design, development, and execution of load and performance tests
Dynamic generation of test data (FIX messages) during load testing with Jmeter
Use of Jmeter, Robot Framework, Python, Ubuntu, IBM MQ, Git
Methods: load tests, test automation, sending and receiving FIX messages to IBM MQ

Jun 2021 - Oct 2021

5 months

Senior Tester

ipoque GmbH – A Rohde & Schwarz Company

Development and execution of automated tests including load and performance tests
Review of user stories and bringing in requirements to make software testable
Use of Jmeter, Selenium, Robot Framework, Python, Jira, Confluence, Ubuntu, Git, GitLab, CI/CD, Docker, Kafka
Methods: load tests, test automation, Scrum

Mar 2020 - Mar 2021

1 year 1 month

Senior Tester

Major bank in Vienna

Analysis of project requirements for regular load and performance tests as well as unit tests
Creation of a project-specific test concept
Design and development of functional and load tests
Execution of load and performance tests with Jmeter as well as unit tests with Selenium (Python)
Test automation and final documentation
Use of Jmeter, Selenium, JavaScript, Java, Python, Jenkins
Methods: load tests, test automation, Scrum

Jul 2019 - Nov 2019

5 months

Senior Load Tester

Public sector (Hannover)

Building a digital administration for Lower Saxony
Creation of load test concepts and proof of concepts
Execution of load tests
Test automation of microservices and REST interfaces
Development of a test framework for test automation of microservices and REST interfaces
Use of Jmeter, SoapUI, JavaScript, BeanShell, Java, Selenium
Methods: load tests, test automation, Scrum

Oct 2018 - Jan 2019

4 months

Test Automation Developer

Dataport Altenholz

Testing and test automation of REST interfaces
Development of a test framework using SoapUI to automate REST interfaces
Use of SoapUI, Swagger, Git, Jenkins, Groovy
Methods: test automation, Scrum

Apr 2018 - Aug 2018

5 months

Tester

CTS EVENTIM AG

Testing of REST interfaces
Development of a test framework for automating REST APIs
Development of a test framework using Selenium for end-to-end tests and UI tests
Use of Jmeter, JavaScript, BeanShell, Java, SpecFlow, SoapUI, Selenium, Postman, TeamCity, Swagger, Magento
Methods: test automation, Scrum

Jul 2017 - Dec 2017

6 months

Senior Load Tester

Öffentlicher Dienst Bund (Nürnberg)

Creation of load test concepts and proof of concepts
Carrying out load tests on application/frontend level
Development of a test framework for test automation of microservices/REST APIs
Use of Jmeter, JavaScript, BeanShell, Java, Git
Methods: load tests, test automation, Scrum

Apr 2017 - May 2017

2 months

Test Automation Consultant

SyroCon Consulting GmbH

Design and support for the project team in developing test automation for development-related test cases, especially for newly developed microservices
Use of Selenium, Jmeter, SoapUI, JavaScript, BeanShell, Java, Git, Jenkins
Methods: test automation, Scrum

Mar 2017 - Apr 2017

2 months

Test Design and Automation

Züricher Versicherung

Creation of a comprehensive test concept including test automation for a Digital Interface
Extension of Jmeter as a new test framework to make tests fully automatic and usable for all users without Jmeter knowledge
Use of Java, JSON, XML, Excel/CSV, Smalltalk, REST API, API management
Methods: test automation

Aug 2016 - Dec 2016

5 months

Test Automation Engineer

VHV Insurance

Design and development of automated integration tests using JMeter for a microservice-based web application
Integration of the integration tests into Jenkins for continuous integration
Development of UI tests using Selenium
Design and execution of load and performance tests using JMeter
Use of Selenium, JMeter, JavaScript, BeanShell, Java, Jenkins
Methods: load and performance tests, test automation, Scrum

May 2016 - Jun 2016

2 months

Load and Performance Test Specialist

Large German bank in Frankfurt

Analysis of project requirements for regular load and performance tests and creation of a project-specific concept
Creation of synthetic test data using JSON
Creation of LPT scripts for service calls and responses
Execution of load and performance tests as well as evaluation of the results
Final documentation
Use of Selenium, JMeter, JavaScript, BeanShell, Java, JSON
Methods: load and performance tests, test automation

Feb 2016 - Mar 2016

2 months

Load and Performance Test Specialist

Large IT service provider in Dortmund / e-commerce provider in Freiburg

Design and development of a test framework for load and performance tests to reproduce and analyze the root causes of performance issues
Support in interpreting and identifying the causes of detected performance issues
Advising developers on fixing performance issues
Use of Linux, JMeter, JavaScript, BeanShell, Java
Methods: load and performance tests, system monitoring

Jul 2015 - Dec 2015

6 months

Load and Performance Test Specialist

Large insurance company in Munich

Design and execution of load and performance tests for a web-based agency system during a data migration (AIX environment)
Coordination of requirements with business, test, and migration teams
Test execution and result documentation
Support in interpreting and narrowing down performance bottlenecks (isolation test)
Advising developers on troubleshooting
Use of AIX, Selenium, JMeter, Dynatrace, JavaScript, BeanShell, Java, Jira
Methods: load and performance tests

Dec 2014 - Apr 2015

5 months

Load and Performance Test Specialist

Reinsurer in Hanover

Design and execution of load and performance tests
Setup of a test environment as a VM in an ESX environment
Isolation tests to narrow down performance bottlenecks
Advising developers on troubleshooting
Stability and functional tests as well as test automation
Use of Selenium, JMeter, JavaScript, BeanShell, VM, Tomcat, JBoss, Java, Maven, Jira, MS Windows, Ubuntu Linux
Methods: load and performance tests, functional tests, test automation

May 2014 - Nov 2014

7 months

Senior Consultant, Test Specialist

Diverse small projects

Execution of various load test projects and application monitoring
Adaptation of existing test frameworks to new application releases
GUI test automation
Extension of E2E application monitoring scripts with new requests
Use of Jmeter, AutoIt, VBScript, Java, C#, .NET, Windows, Linux
Methods: load and performance tests, test automation, E2E application monitoring, GUI automation

Sep 2013 - Apr 2014

8 months

Test Specialist for Load and Performance Tests

T-Systems International GmbH

Design and development of an in-house test framework for load and performance tests
Test automation and GUI/interface automation
Use of SilkPerformer, LoadRunner, Ranorex, HP QTP, AutoIt, VBScript, SQL, MS Windows, VMware
Methods: load and performance tests, business and functional tests, test automation, GUI/interface automation

Nov 2012 - Aug 2013

10 months

Senior Consultant / Developer, Test Specialist for Load and Performance Tests

Large bank in Utrecht

Execution of various load test projects for web applications (online banking)
Application monitoring and test automation of web interfaces (online banking)
Functional and load-performance tests
Use of Selenium (WebDriver, RC, GRID, IDE), MS Windows, Linux, Jmeter, AutoIt, VBScript, Java, C#
Methods: load and performance tests, functional tests, test automation, E2E application monitoring

Jul 2012 - Sep 2012

3 months

Senior Consultant, Project Manager, External Software Developer

Large Swiss bank in St. Gallen

Development of a test data loading system for generating bulk data under statistical requirements
Development of a 24x7 monitoring system with alarm function for a web application
Load and performance tests
Use of AutoIt, Java, XML, Excel
Methods: test automation, test data visualization

Jun 2012 - Jun 2012

1 month

External Software Developer for Test Automation

Logistics company in North Rhine-Westphalia

Development of application monitoring for two communicating software systems (ORTEC and GreenCat)
Performance analysis and statistical evaluation of logged response times
Root cause analysis and evidence for damage claims
Use of AutoIt, Java, JavaScript, Excel, SQL, XML
Methods: functional tests, test automation, E2E application monitoring

Apr 2012 - May 2012

2 months

Testing specialist for load and performance tests

Large German bank in Frankfurt

Load and performance tests after fixing, adapting, and extending existing JMeter scripts for a new software release
Error handling
Use of JMeter, Java, JUnit, JavaScript, BeanShell
Methods: load and performance tests, functional tests, test automation, capture-replay

Mar 2000 - Dec 2011

11 years 10 months

Lead Performance Analyst and Automation Specialist

European data center of an American bank

Building and leading a load and performance team in the EMA region
Load and performance tests as well as quality assurance of software products
Design and development of end-to-end monitoring solutions for critical web applications
Automation of processes in Microsoft Windows environments
Analysis and development of software solutions for complex IT issues
Development of tools for validation and remediation for the audit department to check and adjust system settings
Use of MS Windows, SilkPerformer, Excel, XML, SOA, IIS 5–7, WebLogic, UNIX, SQL, Perl, Oracle, PHP, Python, Delphi, LoadRunner, JavaScript, VBScript, .NET, C, C++, Java
Methods: load and performance tests, business and functional tests, test data automation, test automation, E2E application monitoring

Nov 1998 - Feb 2000

1 year 4 months

Senior Consultant, testing specialist for load and performance tests

American IT service provider in Neuss

Various load test projects for banks and insurance companies
Consulting for SilkPerformer in Germany
Planning of load tests, test execution, test documentation, error logging and tracking
Use of SilkPerformer, SilkTest, JavaScript, C, automation of web interfaces
Methods: load and performance tests, functional tests, test data automation, test automation

Jan 1998 - Oct 1998

10 months

External project manager / software developer

Dresdner Bank

Automation of system-level maintenance tasks using Java/Shell scripts
Problem analysis and solution design, methods consulting
Use of AIX/UNIX, Java, Shell Script
Methods: automation, programming

Apr 1997 - Dec 1997

9 months

External project manager / software developer

Automotive industry in Rüsselsheim

Process automation and interface programming
Development of a Java Beans application for online retrieval of package inserts for chemical substances and car paints
System design
Use of MS Windows, Java Beans
Methods: process automation, programming, interface programming

Apr 1996 - Mar 1997

1 year

External project test employee

IT industry in Mannheim

Load tests and comparative measurements of various IBM mainframes according to DIN 66273/ISO 9126
Automatic generation and visualization of test data
Planning load tests, carrying out tests, and documenting results
Performance analysis
Use of IBM MVS, UNIX, MS Windows, self-developed load simulator and evaluation program, C, Excel
Methods: programming, test automation, automatic generation of test data, test data visualization

Oct 1994 - Mar 1996

1 year 6 months

Load and Performance Test Specialist

Telecommunications in Hamburg

Load tests and comparative measurements of PCs from different manufacturers according to DIN 66273
Automatic generation and visualization of test data
Planning load tests, carrying out tests, and documenting results
Performance analysis
Use of MS Windows, self-developed load simulator and evaluation program, C, Excel
Methods: programming, test automation, test data visualization

Jan 1991 - Sep 1994

3 years 9 months

Research Associate / Project Manager

University of Kassel / Industry

Development of a load test system according to DIN 66273 for measuring and evaluating computer systems
Problem analysis, feasibility study, development of a load simulator and evaluation program
Comparison of the performance of Siemens BS2000, IBM MVS and UNIX
Use of BS2000, MVS, UNIX (Sun OS, AIX), SIMUS, TPNS, self-developed load simulator, statistics
Methods: programming, test automation, test data visualization

Jan 1990 - Dec 1990

1 year

Research Associate / Project Manager / Software Developer

University of Kassel / Industry

Development and programming of an interface between an Apollo workstation and a BS2000 computer for use as a graphical terminal
Use of UNIX (Sun OS), BS2000, CGI, shell scripts, C
Methods: programming, interface programming

Apr 1987 - Dec 1989

2 years 9 months

Research Associate / Project Employee / Software Developer

University of Kassel / Industry

Porting Kyoto Common Lisp (KCL) from UNIX to BS2000
Adapting the original software for BS2000, feasibility study
Use of BS2000, Common Lisp, UNIX, C, assembler
Methods: programming, interface programming

Industry experience

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

Experienced in Banking and Finance, Information Technology, Transportation, Education, Insurance, and Telecommunication.

Banking and Finance

Information Technology

Transportation

Education

Insurance

Telecommunication

Business area experience

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

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

Information Technology

Quality Assurance

Project Management

Research and Development

Product Development

Skills

Focus Areas

Software Quality Assurance
Load And Performance Testing
Analysis And Solving Complex It Problems
Automation Of It Processes, Such As Automated Checks Of Systems/Applications For Their Current Settings And Possible Deviations From The Related Guidelines, As Well As Automated Adjustment Of The Found Deviations
End-To-End Monitoring Of Critical (Web) Applications
Software Solutions In All Procedural, Functional, Logical, And Object-Oriented Programming Languages, As Well As Scripting Languages Such As Vbs, Js, Ws, And Autoit, Etc.

Operating Systems

Windows, Unix / Unix Derivatives Such As Ubuntu, Linux Mint, Macos, Bs2000, Ibm Mainframes “Z/Os”, Etc.

Software / Tools

Jmeter, Gatling, Hp Loadrunner, Silkperformer, Custom Developments (Special Load Test Tools), Hp Quality Center, Silkcentral, Autoit, Selenium-Java, Selenium-Python, Soapui, Ranorex, Ms Office, Excel, .Net, Intellij Idea, Eclipse, Pycharm, Git, Gitlab, Jenkins, Teamcity, Jira, Confluence, Amazon Aws, Pan-Client

Programming Languages

C, C++, C#, Java, Python, Groovy, Scala, Javascript, Typescript, Visual Basic, Vba, Vbscript, Autoit, Pascal, Delphi, Borland Bdl, Batch, Perl, Wsh, Vb, Xml, Html, Cobol, Fortran

Databases

Ms Sql, Oracle

Methods / Procedures

Work In Different Project Types: Waterfall Model, Agile Software Development (Scrum), Load Testing/Comparison Measurements According To Din 66273

Other

Ooa/Ood, Ci/Cd, Amazon Web Services (Aws), Ibm Cloud, Uml, Regular Expressions, Tcp/Ip, Kafka, Ibm-Mq, Apache Activemq

Languages

German

Elementary

Education

University of Kaiserslautern

Diploma in Computer Science, minor in Mathematics · Computer Science · Kaiserslautern, Germany · 1.8

Statistics

Experience

Total positions 30

Experience in Banking and Finance 16 y

Avg length 1 y 2 m

Longest experience 11 y 9 m

Expertise

Recent roles Senior Load and Performance Tester, Senior Tester, Senior Load Tester

Main industries Banking and Finance, Information Technology, Transportation

Main business areas Information Technology, Quality Assurance, Project Management

Qualifications

Highest degree Master

Profile

Member since

August 2025

Last update

August 2026

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Frequently asked questions

Have questions? Find more information here.

Esmail is based in Düsseldorf, Germany.

Esmail speaks the following languages: German (Elementary).

Esmail has at least 35 years of experience. During this time, Esmail has worked in at least 22 different roles and for 27 different companies. The average length of individual experience is 1 year and 2 months. Note that Esmail may not have shared all experience and actually has more experience.

Based on recent experience, Esmail would be well-suited for roles such as: Senior Load and Performance Tester, Senior Tester, Senior Load Tester.

Esmail's most recent position is Senior Load and Performance Tester at Deutsche Bahn (DB-Netz).

In recent years, Esmail has worked for Deutsche Bahn (DB-Netz), Baader Bank, and ipoque GmbH – A Rohde & Schwarz Company.

Esmail is most experienced in industries like Banking and Finance, Information Technology, and Transportation. Esmail also has some experience in Education, Insurance, and Telecommunication.

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

Esmail has recently worked in industries like Transportation, Information Technology, and Banking and Finance.

Esmail has recently worked in business areas like Quality Assurance and Information Technology.

Esmail holds a Master in Computer Science from University of Kaiserslautern.

The availability of Esmail needs to be confirmed.

Daily rate distribution

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Daily rate avg. 900 €

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Median rate 920 €

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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.