Olaf Taesch - BI Architect for Oracle Data Warehouses

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Jessen (Elster), Germany

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Experience

May 2024 - Present

2 years 5 months

Hamburg, Germany

BI Architect in Kanban Team

Gulp / Randstad for HHLA

Creation of automated tests.
Extension of the functionality of the enterprise BI data warehouse.
Design and development in SQL and PL/SQL.
Data modeling as well as performance measurement and tuning.
Creation of and contribution to user stories and concepts.
Technical environment: Windows, Linux.
Database: Oracle 19c incl. DWH, CDB, PDB.
Tools: Confluence, CVS, Eclipse, Git, GitLab, Jira, N4, PL/SQL, SQL Developer, utPLSQL.

Jun 2022 - Mar 2024

1 year 10 months

Hamburg, Germany

Consultant (Architect and Implementation) in Kanban Team TRail

IPSWays for EGIM

Creation of automated tests.
Extension of the functionality of the TRail container rail logistics solution.
Design and development in Java, SQL and PL/SQL.
Implementation of EDI interfaces (AC03, EDIFACT, IFTMIN, JSON, XML, etc.).
Data modeling as well as performance measurement and tuning.
Creation of and contribution to user stories and concepts.
Technical environment: Windows, Linux.
Database: Oracle 19c.
Tools: Bitbucket, Confluence, Docker, Git, IntelliJ, Java, Jenkins, Jira, Maven, PL/SQL, PL/SQL Developer, SQL*Plus, utPLSQL.

Jun 2021 - May 2022

1 year

Hamburg, Germany

Consultant in Kanban Team Invoicing

IPSWays for EUROGATE

Refactoring and consolidation of different database systems in the invoicing environment for container ship transport.
Creation of automated tests.
Extension of the business and technical functionality.
Design and development in Java, SQL and PL/SQL.
Implementation of interfaces to SAP.
Data modeling as well as performance measurement and tuning.
Creation of and contribution to user stories and concepts.
Technical environment: Windows, Linux.
Database: Oracle 19c.
Tools: Bitbucket, Confluence, Docker, Eclipse, Git, Java, Jenkins, Jira, JSON, Maven, PL/SQL, PL/SQL Developer, SQL*Plus, utPLSQL, XML.

Jan 2018 - Dec 2020

3 years

Hamburg, Germany

Consultant in Scrum / Kanban Team Tax & Accounting

SMF for Berenberg

Design and development of tax and accounting solutions in Java, SQL and PL/SQL.
Data modeling as well as performance measurement and tuning.
Implementation and support of interfaces to BZSt, CRS/FATCA, DWH, Elster, IRS, TaxBox, WM.
Extension of regulatory reporting and certification processes.
Test automation using various test frameworks.
Creation of and contribution to user stories and concepts.
Technical environment: Windows, Linux, Oracle Solaris.
Database: Oracle 12c, 18c, 19c incl. DWH, DV2, VPD.
Tools: Angular, APEX, Bamboo, Bitbucket, Camunda, Confluence, Docker, ERwin, Git, IntelliJ, Java, Jenkins, Jira, Jon, JSON, LeanIX, Marathon, Maven, PL/SQL, PL/SQL Developer, Postman, Python, REST, SAFe, SonarQube, Splunk, SQL*Plus, Spring, SVN, utPLSQL, Visual Studio Code, XML.

Jul 2017 - Dec 2017

6 months

Kiel, Germany

Consultant in Scrum Team DWH

CAS for HSH Nordbank

Creation of requirements specifications for the Data Warehouse project "zDP" using Data Vault 2.
Design and data modeling with customer-specific DSL.
Support for regulatory reporting.
Technical environment: Windows, Linux.
Database: Oracle 12c incl. DWH, DV2.
Tools: Confluence, DataVault2, Eclipse, Jira, PL/SQL, SQL Developer, SQL*Plus, SVN, Universal Datamodel Generator (UDG), XText.

Aug 2016 - Jun 2017

11 months

Hamburg, Germany

Consultant in the Scrum Team DWH

SMF for Berenberg

Design and implementation of test automation for the enterprise BI data warehouse using Data Vault 2.
Creation of the concept, prototype, and implementation for automated tests.
Data modeling and performance measurement.
Implementation of XML and XBRL interfaces to BAIS (regulatory reporting).
Test management for the DWH.
Technical environment: Windows, Linux, Oracle Solaris.
Database: Oracle 12c including DWH, DV2, VPD.
Tools: APEX, Bamboo, Bitbucket, Confluence, DataVault2, DevOp, ERwin, Git, Jira, JSON, Pentaho, PL/SQL, PL/SQL Developer, Python, QlikView, SonarQube, SourceTree, SQL*Plus, TestRail, XBRL, XML.

Jul 2015 - Jul 2016

1 year 1 month

Frankfurt, Germany

Consultant (concept and implementation)

Huxley for Commerzbank

Conversion of a BI service from MySQL to Oracle.
Implementation of calculations using statistical methods for Independent Price Verification (I-PV).
Extension and optimization of ETL processes.
Code and performance analysis as well as tuning.
Technical environment: Windows, Linux, Oracle Solaris.
Database: Oracle 12c, MySQL 5.
Tools: Ajax, Apache, APEX, Aqua Data Studio, bash, Confluence, Eclipse, HTML, JavaScript, jQuery including DataTables, JSON, Perl, PL/SQL, REST, SQL*Plus, SQL Developer, SVN, XML.

Jun 2013 - Mar 2014

10 months

Erfurt, Germany

Consultant

IBYKUS Erfurt for Hessische Landesbank

Software development with the company's own development platform in the Agrarumweltprogramm HIAP project.
Further development of customer-specific requirements.
Troubleshooting and technical support.
Technical environment: Windows.
Database: Oracle 11.
Tools: CVS, IBYKUS AP, Remote Desktop, Oracle SQL Developer, PL/SQL.

Jul 2010 - Jun 2015

5 years

Berlin, Germany

Consultant (architect and implementation)

T-Systems for Deutsche Telekom

Long-term further development and maintenance of the BL-T application for preorder research.
Responsibility for architecture, data modeling, and database architecture.
Optimization of SOA- and SOAP-based services.
Conducting code reviews and static code analyses.
Creation of technical concepts and further development of the J2EE application.
Performance measurement and tuning of Oracle RDBMS and Java applications.
Planning and implementation of several migration projects.
Technical environment: Windows, Sun Solaris, AIX.
Database: Oracle 10, 11, PostgreSQL.
Tools: APEX, Apache, Eclipse, EJB, Enterprise Architect, ERwin, ETL, Hibernate, HTML, Java, Jenkins, JMS, JSP, JPA, J2EE, Mercury Quality Center, OCI, PL/SQL Developer, Rational Software Architect for WebSphere, REST, Ruby, Sonar/SonarQube, SQL*Plus, Subversion, Struts, SVN, UML, Visual Source Safe/Azure DevOps Server, WebSphere Application Server, WebSphere MQ, XML, XMLBeans.

Aug 2008 - May 2009

10 months

Berlin, Germany

Consultant (architect and implementation)

T-Systems for Deutsche Telekom

Continued development and optimization of the line research and preorder application BL-T.
Maintenance and expansion of the service-oriented architecture.
Data modeling, database architecture, and performance optimization.
Code review and static code analysis of offshore deliveries.
Implementation of migration projects.
Technical environment: Windows, Sun Solaris, AIX.
Database: Oracle 10, 11, PostgreSQL.
Tools: APEX, Apache, Eclipse, EJB, Enterprise Architect, ERwin, ETL, Hibernate, HTML, Java, Jenkins, JMS, JSP, JPA, J2EE, Mercury Quality Center, OCI, PL/SQL Developer, Rational Software Architect for WebSphere, REST, Ruby, Sonar/SonarQube, SQL*Plus, Subversion, Struts, SVN, UML, Visual Source Safe/Azure DevOps Server, WebSphere Application Server, WebSphere MQ, XML, XMLBeans.

Nov 2007 - Mar 2008

5 months

Berlin, Germany

Consultant (Architecture and Implementation)

T-Systems for Deutsche Telekom

Design and implementation of a line search and preorder system in the BL-T project.
Design and implementation of a service-oriented architecture.
Data modeling and database architecture.
Optimization of existing services (SOA, SOAP).
Code review and static code analysis of offshore projects.
Creation of technical implementation concepts and further development of the BL-T J2EE application.
Performance measurement and tuning in the areas of Oracle RDBMS and Java.
Design and implementation of several migration projects.
Technical environment: Windows, Sun Solaris, AIX.
Database: Oracle 10, 11, PostgreSQL.
Tools: APEX, Apache, Eclipse, EJB, Enterprise Architect, ERwin, ETL, Hibernate, HTML, Java, Jenkins, JMS, JSP, JPA, J2EE, Mercury Quality Center, OCI, PL/SQL Developer, Rational Software Architect for WebSphere, REST, Ruby, Sonar/SonarQube, SQL*Plus, Subversion, Struts, SVN, UML, Visual Source Safe/Azure DevOps Server, WebSphere Application Server, WebSphere MQ, XML, XMLBeans.

Oct 2007 - Dec 2012

5 years 3 months

Wiesbaden, Germany

Consulting / Test Management

T-Systems and CSC for a government agency in Wiesbaden

Design of automated tests for an application with a dynamic data model.
Creation of prototypes and implementation of automated tests.
Design and development of test drivers.
Support in the development of a dedicated test client.
Extension of XML interfaces.
Creation of migration and adaptation scripts.
Test management and coaching of project team members.
Technical environment: HP-UX, Linux, Windows.
Database: Oracle 9, 10, 11 including VPD.
Tools: Castor, CodeBeamer, HTML, HP Quick Test Professional (QTP), Java, JAXB, Maven, Mercury Quality Center, Oracle SQL Developer, WebLogic Server WLS, Perl, PL/SQL Developer, SQL*Plus, SVN, Telelogic Change Management Synergy CMS, Toad, xalan, xerces, XMLSpy, XML, XSL, XSLT.

May 2007 - Jul 2007

3 months

Hanover, Germany

Consultant (Architecture Consulting and Design)

Heise Verlag

Design and support in the development of a prototype for a decentralized news ticker (newsticker, channel, forum, newsletter) based on a content management system.
Consulting on architecture and technical implementation.
Technical environment: Linux.
Database: MySQL.
Tools: Apache Web Server, Perl.

Jan 2005 - Dec 2008

4 years

Augsburg, Germany

Consultant (Design and Implementation)

Klinikum Augsburg

Data modeling for a planning tool and urology documentation.
Design and implementation of the migration strategy.
Design and development of a planning tool.
Development of urology documentation including statistics and automatic generation of form letters.
Technical environment: UNIX, Windows.
Database: Oracle 9i.
Tools: Eclipse, HTML, OCI, Perl, PHP, PL/SQL Developer.

Oct 2004 - May 2007

2 years 8 months

Berlin, Germany

Consultant / Deputy Project Manager

T-Systems for Deutsche Telekom

System analysis as well as web server and database programming for a telecommunications provider.
Design and implementation of a high-availability system.
Data modeling and performance tuning.
Co-development of several J2EE applications.
Design and implementation of a service-oriented architecture via HTTP and JMS.
Creation of business analyses, functional concepts, and technical implementation concepts.
Organization and execution of an offshore project.
Technical environment: HP-UX, Sun Solaris, Windows.
Database: Oracle.
Tools: Apache Web Server, ClearCase, Eclipse, EJB, Enterprise Architect, HTML, IBM WebSphere Application Developer (WSAD), IBM WebSphere Application Server Toolkit (ASTK), Java, JMS, JSP, J2EE, Mercury Quality Center, OCI, Perl, PL/SQL Developer, Rational Application Developer, Samba, SQL*Plus, Subversion, Struts, Toad, Tomcat, UML, WebSphere Application Server, WebSphere MQ, XML, XMLBeans.

Oct 2003 - Dec 2004

1 year 3 months

Berlin, Germany

Consultant

T-Systems for Deutsche Telekom

Continued work on DSL infrastructure management.
System analysis, web server and database programming.
Further performance tuning and data modeling.
Implementation of migration and architecture projects, as well as maintenance of the automated email delivery system.
Technical environment: HP-UX, Linux, Sun Solaris, Windows.
Database: Oracle.
Tools: Apache Web Server, APEX, ASP, Eclipse, CGI, HTML, IIS, Java, OCI, Perl, PHP, PL/SQL Developer, Remedy Action Request System, Samba, SQL*Plus, SQL Server, TestDirector, Toad.

Aug 2001 - Dec 2002

1 year 5 months

Berlin, Germany

Consultant

T-Systems for Deutsche Telekom

System analysis as well as web server and database programming for the DSL infrastructure management of a telecommunications provider.
Data modeling and performance tuning.
Study and prototype for converting ASP to PHP.
Creation of an automated email delivery system.
Execution of various migration projects and architecture analyses.
Technical environment: HP-UX, Linux, Sun Solaris, Windows.
Database: Oracle.
Tools: Apache Web Server, APEX, ASP, Eclipse, CGI, HTML, IIS, Java, OCI, Perl, PHP, PL/SQL Developer, Remedy Action Request System, Samba, SQL*Plus, SQL Server, TestDirector, Toad.

Jan 1999 - Present

27 years 9 months

Consultant / Project Manager

ammoSYS

Concept and implementation of a securities trading system.
Implementation of chart analysis functions.
Development of an automatic price update system via the Internet.
Implementation of an automatic order placement option.
Technical environment: Linux.
Databases: MySQL, MariaDB.
Tools: Apache Web Server, Flask, Matplotlib, NumPy, Pandas, Perl, PHP, Python.

Jul 1998 - Jun 2001

3 years

Frankfurt, Germany

Consultant

Dresdner Bank

Contributed to the "WEB Publishing" study and carried out tool evaluations.
Introduction of the NPS content management system.
System analysis, design and implementation to replace a mainframe solution.
Creation of a portal for business information.
System integration of web application, search engine and publishing system.
Technical environment: Sun Solaris, Windows.
Databases: MySQL, Oracle.
Tools: Apache Web Server, CGI, HTML, HTML-Transit, Infopark NPS, Netscape Enterprise Server, Perl, PHP, Samba, SQL*Plus, TCL, Verity Information Server.

Jun 1995 - Jun 1998

3 years 1 month

Stuttgart, Germany

Consultant / Technical Project Manager

State Office for Land Consolidation Baden-Württemberg

Design and creation of an attribute data management system for a graphical geographic information system.
Development of interfaces to SAP R/3.
Creation of a system class library.
Technical environment: Windows.
Databases: Gupta SQL, Oracle.
Tools: SQL-Windows, Centura Team Developer, C++, Java, Team Windows, ERwin, SQL-Base, Team Object Manager, Oracle Procedure Builder, Oracle Web Server, PL/SQL.

Dec 1994 - May 1995

6 months

Consultant

Systema

Development of a cost allocation calculation for a debt collection system.
SQL-Windows and database programming.
Technical environment: Novell, RS/6000, Windows.
Databases: Oracle, SQL-Base.
Tools: SQL-Windows.

Oct 1994 - Nov 1994

2 months

Munich, Germany

Consultant

AIC für TÜV Bayern

Design and setup of database replication for an assessment project.
Technical environment: Windows.
Databases: Oracle, Gupta SQL-Base.
Tools: SQL-Windows.

Jan 1994 - Present

32 years 9 months

Jessen, Germany

Consultant

Self-employed

Self-employed Consultant since 1994 as an Oracle Senior Consultant.
Focus areas: Data Warehouse, Data Vault 2, database architecture, data modeling, database programming, performance measurement and tuning.
Work in project management, technical project leadership and requirements engineering across various industries (banking, public authorities, industrial, medical technology, media, telecommunications, software).

Jan 1994 - Sep 1994

9 months

Berlin, Germany

Consultant

AIC and IBM for Landesamt zur Regelung offener Vermögensfragen Berlin

Design and co-development of a workflow system (Managementflow).
Text data integration and data modeling.
Setup of a text data management system with centrally managed text modules.
Technical environment: IBM, Unix, Windows.
Database: Informix.
Tools: Q+E, SQL-Windows, Visual Basic.

Jun 1993 - Dec 1993

7 months

Berlin, Germany

Consultant

Microdata

Development of a PPS/ERP solution for a production planning and control system.
Technical environment: HP-UX, Sinix.
Database: DB++.
Tools: C, C++, XVT.

Sep 1988 - May 1993

4 years 9 months

Jessen, Germany

Head of Organization and Data Processing / CIO

GMJ Jessen

Application programming and systems programming.
Introduction of a PPS/ERP solution in mechanical engineering.
Responsibility for organization and data processing.
Technical environment: DOS, HP-UX, RSX.
Database: Eloquence.
Tools: dBase, DECnet, Turbo Pascal, Turbo Vision.

Industry experience

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

Experienced in Information Technology, Professional Services, Banking and Finance, Telecommunication, Government and Administration, and Manufacturing.

Information Technology

Professional Services

Banking and Finance

Telecommunication

Government and Administration

Manufacturing

Business area experience

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

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

Information Technology

Business Intelligence

Project Management

Product Development

Quality Assurance

Operations

Skills

Core Competencies

Oracle Senior Consultant
Data Warehouse, Data Vault 2, Cdvp2
Database Architect, Data Modeling
Database Programming, Ocp
Performance Measurement And Tuning
Project Management And Technical Project Management
Requirements Engineering

Industries

Banking: Web Publishing And Content Management, Securities Trading System, Bi Service, Dwh, Taxation, Data Modeling, Regulatory Reporting, Tax
Public Authority: Process Management, Geo-Information System, Test Automation
Industry: Cio, Erp, Invoicing, Transport, Logistics
Medical Technology: Urology, Controlling
Media: News Ticker
Software: Pps / Erp, Debt Collection System
Telecommunications: Several Projects In The Dsl And Ordering Areas

It Detailed Expertise

Operating Systems: Unix (Aix, Hp-Ux, Sun Solaris, Oracle Solaris), Linux (Debian, Mint, Oracle Linux, Red Hat, Suse, Ubuntu), Windows (Xp / 7 / 8 / 10 / 11), Windows Server (2003 / 2008 / 2012 / 2016)
Architectures: Docker, Eai, Ejb, J(2)Ee, Rest, Soa, Soap, Webservice
Methodologies: Kanban, Scrum, Safe, Waterfall
Databases: Gupta, Informix, Mariadb, Mysql, Oracle (8, 9i, 10g, 11g, 12c, 18c, 19c, 21c), Postgresql, Ms Sql-Server
Modeling Languages: Bpmn, Er, Pap, Uml
Programming Languages: C, C++, Java, Lua, Perl, Pl/Pgsql, Pl/Sql, Python, Ruby, T-Sql, Shell (Bash, Cmd, Ksh, Powershell, Sh), Sql, Sql-Windows, Tcl, Visual Basic, Xslt
Web Technologies: Ac03, Ajax, Angular, Asp, Bootstrap, Cgi, Css, Dtd, Flask, Iftmin, Html, Javascript, Jquery, Jsp, Json, Php, Rest, Struts, Soa, Soap, Spring, Svg, Wsdl, Xampp (Lamp, Wamp…), Xbrl, Xsd, Xsl, Xml
Middleware: Bea, Java Ee (J2ee/Jee), Jboss, Jms, Mq, Rpc, Tomcat, Ibm Websphere Application Server, Oracle Application Server (Oas), Oracle Weblogic Server (Wls)
Tools / Frameworks: Ant, Apache Web Server, Aqua Data Studio, Axon, Azure Devops Server, Bamboo, Bea Weblogic Server (Wls), Bitbucket, Camunda, Castor, Centura Team Developer, Chart Director, Clearcase, Cm Synergy, Confluence, Codebeamer, Cvs, Datavault2, Devop, Dwh, Eclipse, Ejb, Enterprise Architect, Ibm Websphere Application Server Toolkit (Astk), Erwin, Etl, Git, Hibernate, Hp Quick Test Professional (Qtp), Ibykus Ap, Infopark Nps, Intellij, Jaxb, Jboss, Jbuilder, Jdbc, Jenkins, Jira, Jon, Joomla, Jpa, Junit, Keycloak, Leanix, Maven, Mercury Quality Center, Ms Internet Information Server, Netscape Enterprise Server, Nginx, Numpy, Odbc, Oracle Apex, Oracle Call Interface (Oci), Oracle Data Modeler, Oracle Designer, Oracle Procedure Builder, Oracle Sql Developer, Office (Libre, Ms, Open), Owncloud, Pentaho, Phpeclipse, Phpnuke, Pl/Sql Developer, Postman, Ppi Udg, Qlikview, Rational Application Developer (Rad), Rational Software Architect (Rsa), Remedy Action Request System, Samba, Selenium, Sonar / Sonarqube, Sourcetree, Sql*Plus, Splunk, Spring, Subversion (Svn), Swing, Team Object Manager, Testdirector, Testrail, Toad, Tora, Universal Datamodel Generator (Udg), Utplsql, Verity Information Server, Visual Source Safe, Visual Studio Code, Vmware, Websphere Studio Application Developer (Wsad), Websphere Mq, Xalan, Xerces, Xmlbeans, Xmlspy, Xtext

Specialized Expertise

Data Warehouse, Data Vault 2
Database Architect
Relational Databases, Oracle
Test Automation
Requirements Management
Process Analysis

Languages

German

Native

English

Advanced

Russian

Elementary

Education

Oct 1983 - Jun 1988

Diplom Wirtschaftsinformatiker · Business Information Systems

Certifications & licenses

Certified Data Vault 2.0 Practitioner (CDVP2)

Oracle Certified Professional – Advanced Pl/SQL Developer (OCP)

Oracle Pl/SQL Developer Certified Associate (OCA)

Statistics

Experience

Total positions 26

Experience in Information Technology 32.5 y

Avg length 4 y

Longest experience 32 y 8 m

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles BI Architect in Kanban Team, Consultant (Architect and Implementation) in Kanban Team TRail, Consultant in Kanban Team Invoicing

Main industries Information Technology, Professional Services, Banking and Finance

Main business areas Information Technology, Business Intelligence, Project Management

Qualifications

Certifications earned 3

Profile

Member since

January 2026

Last update

September 2026

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Frequently asked questions

Have questions? Find more information here.

Olaf is based in Jessen (Elster), Germany and can operate in on-site, hybrid, and remote work models.

Olaf speaks the following languages: German (Native), English (Advanced), Russian (Elementary).

Olaf has at least 38 years of experience. During this time, Olaf has worked in at least 17 different roles and for 20 different companies. The average length of individual experience is 2 years and 6 months. Note that Olaf may not have shared all experience and actually has more experience.

Based on recent experience, Olaf would be well-suited for roles such as: BI Architect in Kanban Team, Consultant (Architect and Implementation) in Kanban Team TRail, Consultant in Kanban Team Invoicing.

Olaf's most recent position is BI Architect in Kanban Team at Gulp / Randstad for HHLA.

In recent years, Olaf has worked for Gulp / Randstad for HHLA, IPSWays for EGIM, IPSWays for EUROGATE, ammoSYS, and Self-employed.

Olaf is most experienced in industries like Information Technology, Professional Services, and Banking and Finance. Olaf also has some experience in Telecommunication, Government and Administration, and Manufacturing.

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

Olaf has recently worked in industries like Information Technology, Professional Services, and Banking and Finance.

Olaf has recently worked in business areas like Business Intelligence, Information Technology, and Project Management.

Olaf attended education in Business Information Systems.

Olaf has 3 certificates. These include: Certified Data Vault 2.0 Practitioner (CDVP2), Oracle Certified Professional – Advanced Pl/SQL Developer (OCP), and Oracle Pl/SQL Developer Certified Associate (OCA).

Olaf is immediately available full-time for suitable projects.

Daily rate distribution

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Average rates for similar positions

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Daily rate avg. 890 €

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500

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Median rate 840 €

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