T-SQL Expert in Cologne
to shape reliable data systems with vetted, available freelancersHire experts who design SQL Server databases, tune complex queries and build dependable reporting workflows with T-SQL, SSIS and Power BI. Get fast, precise matching with vetted and available freelancers for remote or on-site work.
Meet FRATCH Experts in Cologne, who have recently used T-SQL
Henning U.
Last position:
Senior Expert Data Governance, Master Data Quality and Data Migration at E.ON
- Planning and implementation of a migration strategy for master and transaction data for the continuous loading of a cloud-independent database
- Creation and pilot implementation of a company-wide Business Data Model for customers, suppliers, contracts, products, prices, consumption, invoices, and dunning
- Concept and consulting for a Data Governance Framework incl. definition of committees, roles, processes, and metadata model
- Operationalization of the Data Governance Framework with definition of data standards
- Sub-project management in two pilot projects (PoCs) for Data Governance systems (ErwinDIS and Atlan)
- Training and coaching the data team in migration, data quality, and data modeling
Yaroslav S.
Last position:
Senior Low-Code Consultant at Freelancer
Structured analysis and evaluation of business processes
Gathering, documenting, and prioritizing requirements
Creating business-friendly and technically executable process models
Use of Camunda tools
Deriving requirements and interfaces from BPMN diagrams
Coordination with stakeholders and business units
Translating business requirements into technical solution designs
Implementing efficient and tailored applications
Systematic collection, analysis, and documentation of requirements
Prioritizing and validating requirements in close collaboration with stakeholders
Alignment between business and development to ensure shared objectives
Creating use cases, user stories, and acceptance criteria
Continuous requirements and change management throughout the project lifecycle
Define project goals and create project plans
Delegate tasks and monitor project progress
Monitor budgets and inform stakeholders
Mendix: Architecture, development, and maintenance of custom applications (Microflows, Domain Model, Security, XPath)
Modeling Mendix workflows for process optimization
Develop scalable apps with Mendix including REST/SOAP integration with SAP, SQL, Azure & SharePoint
UI design for Mendix using Atlas UI, Fluent UI, HTML, CSS, JavaScript
Develop web & mobile apps with Mendix using agile methods (Scrum, Kanban)
Implement business logic with Mendix Microflows and Nanoflows
Performance optimization and architecture improvements for Mendix applications
Conduct Mendix training
Create technical documentation and best practices for Mendix
Coaching and mentoring for low-code development with Mendix
Thomas R.
Last position:
BI Consultant and Power BI Developer at Plusnet GmbH
- In-depth forensics of old and new data sources
- Enhancing existing reports and creating new data analyses
- Data preparation from source systems and semantic models
- Azure DevOps integration
- Tools/Skills: MS-PowerBI, DAX, MS-Office 365, PowerQuery, M, PowerAutomate, Redmine, SharePoint, SQL (T-SQL, Oracle), MS Fabric
Vladimir M.
Last position:
Developer at Financial services provider
- Support and further development of a framework for developing applications in a banking association: DynS/OSPE
- Migration of the framework to Java 11 and Java 17
- Java8, Java11 and Java17, Spring, Spring-Batch, Spring WebServices, Spring-Security, Spring-Data, JPA, Hibernate, OpenSource libraries etc.
- XML, JAXB, JSON, REST and SOAP services, DB2, Oracle, WebSphere or Liberty AS, FreeMaker, Junit, mock libraries, JaCoCo, Maven, IntelliJ, Eclipse, GitHub, SVN, Jira
Peter B.
Last position:
Data Warehouse Consultant (Development and Analysis) at Atruvia AG
- Developed and enhanced ETL loading jobs with IBM DataStage and optimized SQL in an IBM DB2 environment as part of the Agree21 data migration
- Analyzed data quality and developed test procedures
- Created PowerShell scripts and documented GIT deployment processes
- Technologies: RedHat Linux, IBM DB2 with DBVisualizer, IBM InfoSphere DataStage 11.7, JIRA, TortoiseGIT, TortoiseSVN, PowerShell scripts
Robert M.
Last position:
Air traffic tax German Customs Administration SOAP Webservices Client Requests at Team GmbH
In the citizens' and business customer portal of the Customs Administration, airlines submit applications for departures and landings every month
These applications are forwarded to the caseworkers via SOAP web service and, after review and processing, any queries or notifications are returned via SOAP web service
PL/SQL programming of SOAP webservices client requests for HTTP/XML message exchange between the BuG portal and the caseworkers
New creation and change requests for Forms and Reports 12 modules
Forms applications start and read SOAP webservice requests via PL/SQL packages, process them and send Reports 12 documents to the airlines
Ronny H.
Last position:
Förderbank Deutschland
- Extraction and transformation of relevant data from the SAP system developed for the bank and consolidation into the existing reporting environment
- Integration of the data into the existing BI model (extending the star schema to a galaxy schema) for generating the funding committee report and the business development report
- Ensuring data quality
- Knowledge transfer to department staff (SAP, SQL database, Power Pivot, DAX)
René P.
Last position:
CIO at clics GmbH
- Software development
- Team management
- Project management
Discover over 15,000 top freelancers
Statistics of experts using T-SQL
Aggregated from the professional profiles of matched freelancers.
Experience
23 years
Position duration
3.8 years (Germany: 3 years)
Positions per freelancer
14 (Germany: 16)
Top business areas
Information Technology, Product Development, Business Intelligence
Top industries
Information Technology, Banking and Finance, Transportation
Certification focus areas
Project Management, Product Development, Information Technology
Bachelor's degree or higher
67% (Germany: 84%)
Master's degree or higher
17% (Germany: 52%)
Doctorate
17% (Germany: 9%)
Certifications per freelancer
3
Most common languages
German, English, Russian
Speak two or more languages
88% (Germany: 95%)
Based on our profile pool as of 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Cologne are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Cologne using T-SQL
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
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 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
T-SQL experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (88%)
- Banking and Finance (63%)
- Transportation (63%)
- Professional Services (50%)
- Telecommunication (50%)
- Insurance (38%)
- Manufacturing (38%)
- Automotive (25%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
T-SQL fundamentals
T-SQL, or Transact-SQL, is Microsoft's procedural extension of SQL for Microsoft SQL Server and Azure SQL. It combines relational data access with variables, control flow, transactions, error handling and stored procedures. Companies use it to implement reliable database logic close to their data.
Where it fits
T-SQL supports transactional systems, analytical workloads and operational reporting across sectors such as manufacturing, logistics, retail, finance and public services. In Cologne, specialists may work with local teams on enterprise databases or collaborate remotely across Germany. The language is especially valuable where SQL Server is already central to business operations.
Typical deliverables
- Relational schemas, tables, views and indexes
- Stored procedures, functions and triggers
- Data migration and cleansing scripts
- Query tuning and execution-plan improvements
- Reporting datasets for SSRS or Power BI
These deliverables connect application workflows with consistent, governed data. Strong work also documents dependencies and protects production systems during releases.
Ecosystem and skills
T-SQL specialists commonly work with SQL Server Management Studio, Azure Data Studio, SQL Server Agent, SSIS, SSRS and Azure SQL Database. They understand backups, restore strategies, permissions, locking, isolation levels and high availability. Useful adjacent skills include database design, ETL, PowerShell, Git-based deployment and Power BI data modelling.
When to bring in expertise
- Slow queries are affecting customer or internal applications
- A legacy SQL Server database needs refactoring or migration
- Reports rely on inconsistent or duplicated business logic
- Data must move safely between systems
- A release needs controlled database changes
Freelance expertise is useful when a team needs focused capacity without adding permanent database ownership. A specialist can diagnose bottlenecks, establish standards and leave maintainable scripts behind.
What strong specialists deliver
Strong professionals translate business rules into clear, testable T-SQL and explain trade-offs in plain language. They inspect execution plans rather than guessing, measure changes safely and consider concurrency, data quality and rollback paths. They also distinguish a quick query fix from a durable improvement to schema, indexing or application design.
Frequently asked questions
What clients ask us most about T-SQL — answered in short.
T-SQL is used to query and modify data in Microsoft SQL Server and Azure SQL. Companies also use it for stored procedures, transactional workflows, data validation, reporting logic and database administration tasks.
T-SQL includes standard SQL capabilities but adds Microsoft's procedural features, such as variables, branching, error handling and transaction control. It is designed for the SQL Server ecosystem, while standard SQL is intended to be more portable across database products.
A strong T-SQL specialist often understands SQL Server internals, database modelling, indexing and execution plans. Experience with SSIS, SSRS, Power BI, Azure SQL, scripting and version-controlled database deployment can also be important.
The required depth depends on the work. A simple report may need solid query and data-modelling skills, while a migration, performance investigation or high-volume transactional system calls for proven T-SQL work with execution plans, locking, recovery and deployment risks.
T-SQL projects are often suitable for remote collaboration because specialists can work through secure access, repositories and documented deployment processes. On-site sessions in Cologne can still help with workshops, legacy-system discovery or close coordination with data and application teams.
T-SQL is a natural choice when an organisation already relies on SQL Server, Azure services, Microsoft identity or tools such as SSIS and Power BI. PostgreSQL or Oracle SQL may be preferable for different licensing, portability, operating-system or platform requirements, so the existing environment matters.
Review whether the T-SQL is readable, parameterised, testable and safe under concurrent use. Ask for evidence of execution-plan analysis, indexing decisions, transaction handling, rollback planning and monitoring rather than judging quality from query length alone.
A T-SQL freelancer should clarify the SQL Server or Azure SQL version, workload type, data volume, deployment process, access restrictions and success criteria. They should also understand whether the assignment focuses on new database logic, performance, migration, reporting or support for a legacy system.
The average hourly rate of freelancers in Cologne, Germany who have used T-SQL in their recent projects is 97 €, which corresponds to a daily rate of about 779 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used T-SQL in their recent projects, 67% hold at least a Bachelor's degree, 17% hold at least a Master's degree, and 17% hold a doctorate.
On average, freelancers in Cologne, Germany who have used T-SQL in their recent projects have 23 years of professional experience, with a single engagement typically lasting around 3.8 years.
The most common languages among freelancers in Cologne, Germany who have used T-SQL in their recent projects are German (100%), English (88%), and Russian (25%).
The most common industries among freelancers in Cologne, Germany who have used T-SQL in their recent projects are Information Technology (88%), Banking and Finance (63%), and Transportation (63%).
The most common business areas among freelancers in Cologne, Germany who have used T-SQL in their recent projects are Information Technology (100%), Product Development (88%), and Business Intelligence (75%).
Main locations of FRATCH Experts, who have recently used T-SQL
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Berlin Hamburg Munich 
Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg 
Munich 
Frankfurt 
Dusseldorf Countries:
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