SQL Experts in Hanover
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Meet FRATCH Experts in Hanover, who have recently used SQL
Michael Serejenkov
Last position:
Data Scientist at CompuGroup Medical Deutschland AG, docmetric GmbH
Development of AI-based and classical models for analyzing medical and patient data, including medication analyses, diagnosis analyses, forecasts, procedure analyses, dosage analyses, comorbidity analyses, prescription analyses, patient potential analyses, and referral profile analyses. Analyses in the area of Real World Evidence.
- Gathering customer requirements
- Planning the subproject
- Designing and defining KPIs
- Designing and developing models and visualizations of the results using customer dashboards
- Developing and implementing DWH adjustments
- Deriving recommendations for action
Methods, technologies: Simulation, Artificial Intelligence, Python, R, SQL, Microsoft Power BI, Amazon Web Services, Elasticsearch, PostgreSQL, Databricks, Multivariate Statistics
Dennis Schuchardt
Last position:
Lead Full Stack at Self-employed
- Billing software for the second-highest security authority of the Federal Republic of Germany
- Passed security clearance level 2
- Frontend and backend development
- Consulting on the introduction, design, implementation, and development of technical components
- Code reviews, component testing, module testing, group module testing
- Implementation of UI/UX design
- Used technologies: HTML, CSS/SCSS, JavaScript, Node.js, Vue 3, PrimeVue, Webpack, Vuex, Momentum, Jest, NPM, Lodash, Java 17, Spring Boot, Lombok, GraphQL, JUnit, Maven, Keycloak, Python, Docker, CI/CD, Kubernetes, Oracle SQL, Postman, Storybook, Microservices, Monorepo, Jira, Confluence, Scrum, GitLab, AWS, IntelliJ, Visual Studio Code, Neovim, XLSX, responsive Webdesign, BITV 2.0 (U.S. Section 508) / WCAG 2.2
Thore Fahrtmann
Last position:
Data & AI Consultant at ContiTech GmbH
- Consultancy Databricks Lakehouse Platform Architecture
- Migration of existing manufacturing data services to Databricks. Existing services are running on various platforms & tools and are unified on target platform
- Implementation of new Data & AI use cases on Databricks platform (e.g. connecting new systems, building AI Agent prototypes, …)
Tech Stack: Databricks, Azure, PySpark, Python
Joern Thieme
Last position:
Senior Software Developer | Database Expert | Business Intelligence | 24+ years of project experience at HannoMax GmbH
Are you looking for more than just a developer, but a partner who understands business processes and develops sustainable solutions? Then I am the right person for you.
For more than 24 years, I have been helping companies develop software solutions, use data intelligently, and make business processes more efficient. I combine solid technical expertise with a deep understanding of business operations and economic relationships.
My focus is on developing custom software and database solutions as well as integrating existing systems. I have implemented numerous projects in which CRM, ERP, webshop, logistics, and other business systems were connected with each other. The result is automated processes, less manual work, and higher data quality.
I also develop business intelligence and data warehouse solutions as well as management reports that give decision-makers a reliable data basis at any time.
I get up to speed quickly in existing systems and also find practical, cost-effective solutions for complex requirements. I always keep the overall system in view - not just individual lines of code.
My services at a glance:
- Custom software development
- Database development and performance optimization
- Business Intelligence & Data Warehouse
- Management reporting and dashboards
- ERP, CRM, webshop, and logistics integration
- Interface development and process automation
- Analysis and optimization of business processes
- Technical consulting and solution architecture My clients value my structured way of working, my quick grasp of things, and my high standards of quality. I think like an entrepreneur, communicate on equal footing, and develop solutions that work well in the long run.
My goal is simple: simplify processes, make data usable, and help companies become more successful with well-thought-out software solutions.
Willi Ziegenhagel
Last position:
Data Analyst
- Analysis of process data
- Data preparation with SQL
- Development of reports & dashboards in Celonis
Martin Schaefer
Last position:
MS Fabric Certification
MS Fabric certification with creation of pipelines and notebooks in Fabric using data from Azure, Azure Repos, Azure Boards, and GitHub. Data ingestion via OneLake Explorer, direct IP connection, and API (REST) are the main topics
Jürgen Windheim
Last position:
IT Project Manager at Daimler Financial Services
- Implementation of a financing and leasing system for Market NL (Miles / Miles MMP) from supplier Sofico
Arnav Sarkar
Last position:
Scientific Assistant (HIWI) at Institute of Transport and Automation Engineering, Production Technology Center, Leibniz University Hannover
- Implemented stereo camera calibration and applied incremental Structure from Motion (SfM) algorithms to build a detailed 3D model of a forklift for an AR-enabled Smart Forklift project
- Developed OpenCV-based preprocessing that improved data accuracy by 20% and enhanced the analysis of industrial videos
Kristof Blümel
Last position:
Strategic Consulting at German Grid-Battery Storage Provider
- Consulted on IT security and process optimization, focusing on NIS2 and risk requirements
- Troubleshot and optimized plant core networks using STP, certified hardware, and open-source components such as OPNsense
- Redesigned network segmentation for VLAN rollout in a hybrid multisite multicloud setup using Tailscale VPN
- Facilitated cross-departmental discussions to align technical and social requirements
- Optimized monitoring with Grafana, Telegraf, and SNMP configurations
- Prototyped network setup for a new plant, including VLAN separation with Tailscale VPN
- Automated various scenarios using Python and Bash scripting
Martin Zander
Last position:
Consulting, Design and Development at ivv GmbH
- Design, development and maintenance of a web application as a policy management system based on a JEE backend and a Vaadin-based UI
- Design and development of interfaces
- Integration of databases
- Design and development of unit and integration tests
- Conceptual coordination with the client
- Technologies and methods: JEE, Vaadin, EJB, Innovator, Hibernate, REST, JMS, SQL, MQ, Maven, Selenium, Arquillian, Mockito, JUnit, Log4j, OOA, OOD, Scrum, Kanban, JavaScript, HTML, CSS, Jenkins, Jenkins Pipelines, Git, GitLab, Subversion, Jira, Confluence, DB2, WebLogic
Mei-Fang Chen
Last position:
Medical Consultant at Atheneum
- Provided expert consultation by analyzing clinical and market data for 20+ cases, driving data-driven pipeline decisions that optimized R&D prioritization and accelerated project timelines.
- Advised on reimbursement pathways and pricing for critical medicines, aligning clinical data with payer expectations.
Maximilian Mayerhofer
Last position:
Test Data Creation and Management at statutory accident insurance
- Provision of cross-system synthetic test data for test automation for insured persons, companies and external partners in coordination with specialist departments and stakeholders, taking requirements and test cases into account
- Synthesis of test data with regard to data protection and data security
Christian Krah
Last position:
Service Catalog Manager at Deloitte team
- Worked in the IT infrastructure of the Deloitte team.
- Planned assignment as service catalog manager at an insurance company in Hanover.
Janus Thomys
Last position:
Senior Scrum Master, Agile Coach at DMK, Bremen, Germany
- Optimizing agile work using Scrum as the chosen framework
- Coaching teams and individual members to increase collaboration efficiency, improve team effectiveness and performance, and foster a culture of continuous improvement
- Promoting and supporting the use of agile methods with Scrum, including upholding Scrum values and team self-organization
- Preboarding the internal Scrum Master
Jens Kopper
Last position:
Freelancer at IT-P GmbH
- Supported the production rollout of the KVAI-Classic master data system
- Analyzed and fixed errors in PL/SQL-based interfaces on Oracle 19
- Designed fixes and enhancements for the service provider
Discover over 15,000 top freelancers
Statistics of experts using SQL
Aggregated from the professional profiles of matched freelancers.
Experience
23 years (Germany: 19 years)
Position duration
3.9 years (Germany: 5.2 years)
Positions per freelancer
13 (Germany: 12)
Top business areas
Information Technology, Business Intelligence, Product Development
Top industries
Information Technology, Manufacturing, Professional Services
Certification focus areas
Information Technology, Business Intelligence, Operations
Bachelor's degree or higher
83% (Germany: 89%)
Master's degree or higher
56% (Germany: 59%)
Doctorate
22% (Germany: 9%)
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
90% (Germany: 97%)
Based on our profile pool as of 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Hanover 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 Hanover using 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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
SQL in practice
SQL is the standard language for working with relational data. Companies use it to query records, join tables, update transactions, and shape data for reports, dashboards, and applications. Strong SQL work keeps data consistent and easy to use.
What experts deliver
- Query design for analytics and operational systems
- Schema work for tables, keys, indexes, and constraints
- Stored procedures, views, and triggers where they fit
- Data migration, cleanup, and integration support
- Performance tuning for slow statements and heavy workloads
Common database stacks
SQL experts often work with PostgreSQL, MySQL, Microsoft SQL Server, and Oracle Database. In some teams they also touch Transact-SQL, PL/SQL, and reporting tools that sit close to the database. The best specialists know how the language behaves inside each engine.
When to bring in help
Bring in freelance expertise when queries become hard to maintain, reports no longer match the source data, or a migration must be done with care. Companies in Hanover also use outside specialists when local teams need short-term support for ERP, logistics, manufacturing, or finance systems.
What strong specialists do well
Good SQL professionals read data models quickly and spot weak joins, missing indexes, and unsafe updates. They write clear queries, explain trade-offs, and test with real data volumes. They also work well with product, analytics, and backend teams.
How to work together
SQL work can be done fully remote in most cases, because the main output is schema, queries, and review notes. On-site work can help when access rules, legacy systems, or business logic need closer coordination. Clear database access and sample data speed up the work.
Frequently asked questions
Need clarity? These are the questions we hear most often about SQL.
SQL is used to store, read, change, and analyze data in relational databases. Companies use it for application data, reporting, audits, integrations, and data cleanup. It is one of the core tools behind dashboards and operational systems.
Yes. SQL is the common abbreviation for Structured Query Language. In practice, people often say SQL when they mean the language itself, and sometimes they use engine-specific names such as T-SQL or PL/SQL when the work depends on a specific database.
SQL is usually the better choice when data has clear relationships and the team needs strong consistency, joins, and structured reporting. NoSQL fits different access patterns, but it trades away some of the relational features that SQL handles naturally. Many systems use both for different layers.
A strong SQL specialist usually understands data modeling, indexing, query planning, and the specific database engine in use. Helpful adjacent skills include ETL work, reporting tools, and basic scripting for automation. In many projects, knowledge of PostgreSQL, MySQL, SQL Server, or Oracle matters as much as the language itself.
The right level depends on the task. Simple query fixes or report support may need only focused experience, while migrations, performance work, and schema redesign need someone who has handled production data before. For critical systems, ask for examples that match your database and workload.
Most SQL work can be done remotely because the main tasks are queries, schema changes, and review. On-site time in Hanover can help when teams need access to legacy systems, business users, or sensitive internal processes. Many projects use a mix of both.
Look for clear query structure, careful handling of joins and nulls, and a strong explanation of why a solution is safe. A good SQL professional also thinks about indexes, data volume, and how the query will behave in production. Clean deliverables and solid testing matter more than buzzwords.
Often yes, at least for advanced work. SQL is shared across these systems, but each engine has its own functions, performance rules, and administrative habits. For simple queries, one specialist may cover several databases; for tuning or migration, engine-specific experience is important.
The average hourly rate of freelancers in Hanover, Germany who have used SQL in their recent projects is 94 €, which corresponds to a daily rate of about 755 € based on an 8-hour working day.
Of the freelancers in Hanover, Germany who have used SQL in their recent projects, 83% hold at least a Bachelor's degree, 56% hold at least a Master's degree, and 22% hold a doctorate.
On average, freelancers in Hanover, Germany who have used SQL in their recent projects have 23 years of professional experience, with a single engagement typically lasting around 3.9 years.
The most common languages among freelancers in Hanover, Germany who have used SQL in their recent projects are German (100%), English (90%), and French (24%).
The most common industries among freelancers in Hanover, Germany who have used SQL in their recent projects are Information Technology (95%), Manufacturing (52%), and Professional Services (52%).
The most common business areas among freelancers in Hanover, Germany who have used SQL in their recent projects are Information Technology (95%), Business Intelligence (71%), and Product Development (71%).
Main locations of FRATCH Experts, who have recently used 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 
Nuremberg Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
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We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
