SQuirreL SQL Experts in Germany
for reliable database work, matched with vetted and available freelancers in minutesHire experts who manage JDBC connections, inspect complex schemas and troubleshoot SQL across mixed database environments. Work with specialists who can support migrations, query analysis and data validation, with fast, precise matching to vetted, available freelancers.
Meet FRATCH Experts in Germany, who have recently used SQuirreL SQL
Silvia B.
Last position:
Business Consultant - Product Management Banking at Aareal Bank AG
- Focus on optimizing and further developing the internal customer EBICS application
- Functional and technical consulting for Aareal First Financial Solutions AG on EBICS standard products and applications in the areas of operations and further development, as well as project-related communication with external development partners and the product manufacturer to implement the corresponding technical optimizations
- As the functional coordinator, providing advice on content-related and regulatory requirements as well as technical prerequisites and requirements, and bringing these together at the functional level
- Consulting on the use of EBICS formats
- Reviewing the current EBICS standard for optimization and further development potential
- Analyzing the current state to identify development potential and deriving appropriate recommendations for action while considering regulatory requirements
- Conducting EBICS tests throughout the project
- Functional responsibility for requirements management and, in this context, recording and documenting requirements for such tests
- Designing a functional and sustainable test management system
- Conducting and evaluating tests
- Consulting on sustainable quality assurance and audits
- Project language: German and English
- Tools/Methods: MS Project, MS Office, MS Visio, TestRail, Confluence, Jira, Business Logics Bankkrecher, Business Logics Test Data Generator, Business Logics Banking Tool, Business Logics Test System, DBEAVER, Squirrel, Unix Virtual Machines, WinSCP, Kitty, Putty, various Aareal Bank products, Online Banking Portal, Aareal Sign, core banking system, SAP Blue Eagle, SAP RE-FX, Aareon Wodis Sigma, Haufe Real Estate Wowinex, GAP Group Immotion, UTS Karthago, SAP IS-U/Waste, SIV kVASy, various EBICS clients
William N.
Last position:
Power BI Solutions Architect/Engineer & AI Consultant at AVERDUNG GmbH
- Redesign of the company's BI infrastructure: replacement of a fragmented landscape of manually maintained Excel solutions and CSV imports with a centralized Power BI environment featuring a unified data model as the company-wide single source of truth
- Consolidation of previously isolated reporting logic into a central semantic model – eliminating redundant files, manual data transfers, and inconsistent metrics between departments
- Forecasting & planning: Design and implementation of company-wide liquidity planning in Power BI – from business logic to a fully automated, data-source-driven planning model replacing the previous manual Excel process; enables rolling forecasts and continuously up-to-date cash flow transparency for management
- Optimization of existing Power BI dashboards in terms of performance, structure, and analytical value using an AI-native approach
- Analysis and improvement of the data model, including data quality analyses, data cleansing, and consistent modeling using star schema, DAX, and Power Query
- Incident & anomaly analysis: Identification, investigation, and explanation of data anomalies, including root-cause analysis and concrete recommendations for action
- AI solution architecture: Connecting Business Central and Power BI to LangDock via MCP (Model Context Protocol) for AI-supported data usage
- Creation of a historical data layer as a basis for trend and time-series analyses
- AI-supported automation: Design and development of AI skills, agents, loops, and processes for the automated analysis and interpretation of reports
- Automated reporting workflow: Setup of scheduled, automated email distribution of AI-generated analyses and recommendations to stakeholders
- Gathering and documentation of business requirements and coordination with business departments and IT as part of requirements engineering / product owner activities
- Breaking down overall requirements into clearly defined work packages and tasks
- Definition, prioritization, and management of milestones throughout the entire project lifecycle
Tools: POWER BI, M365, Copilot Studio, MIRO, Microsoft Business Central, Microsoft Fabric, Claude AI, ChatGPT, LangDock, MS VS Code
Bernhard S.
Last position:
Agile Business Analyst and Requirements Engineer at Deutsche Post DHL
- Agile project "PEPSi annual vacation planning MVP Lite" (digitalization project).
- Definition of state transitions for the JUP Lite functionality.
- Creation of user stories for login/logout and registration.
- Quality assurance of the business-side concept.
- Preliminary analysis for the transformation from the old PersPlan to DigiPEP.
- Tools used: Signavio, MS Office (Excel, Word, PowerPoint), Jira, Confluence, Mural, Miro, Conceptboard, MS Teams, Mattermost.
Stefan M.
Last position:
Bundesrechtsanwaltskammer
- Design, planning and execution of complex acceptance tests for a document exchange platform for the German justice authorities.
- Validation of decrypted and certificate-based message exchange via web platform, mobile app, and Java API.
- Documentation of test cases, execution steps, and test results.
- Technologies: Windows 11/10, Ubuntu, iOS, Android, Bash for Windows, Java 17, IntelliJ, Git, Jira, Confluence, Citrix Server, xJustiz standard implementation, specific justice software.
Allal K.
Last position:
Java Senior Full Stack Developer at Insurance ÖRAG
- Further development of a policy administration system (contract/claims) for the legal expenses insurer ÖRAG.
- My role: Senior Software Developer.
- The team consists of 12 developers.
- Technologies used: Java 8/21, Java EE, Quarkus, WebLogic, JPA, RabbitMQ, JTA, CI, CD, Jenkins, DB2, Maven, Jenkins, GIT (bitbucket) later GitLab, Junit, Elasticsearch, Mockito, Jira, SonarQube, Scrum, React, Workflow
- Migration and modernization of legacy systems: rewrote C and C++ code in Java to improve maintainability, scalability, and performance. Refactored Python into Java, including optimization and integration into modern architectures.
- Study on the use of AI (Codex) for implementing a Java feature. The goal is to compare the time spent and productivity of AI-supported development with a classic implementation by a developer. The results should show how strongly the use of AI affects development time and efficiency.
- Development of the following tariff calculators for the years 2024/2026: private, companies, doctors, farmers, owner-occupied G + H, landlords, traffic, club, top managers, sales representatives, special criminal law, savings bank, municipal, BayGT, doctors, Dehoga
Max L.
Last position:
Test Analyst (manual testing) – Microsoft Dynamics 365 Business Central (Factoring) at ABC Finanz Bank Köln
- Planning, execution, and documentation of manual tests in the factoring module of Microsoft Dynamics 365 Business Central, supported by AI-based tools for structuring
- Working in an agile project environment with two-week sprint cycles, including sprint planning, review, and QA coordination
- Implementation of progressive and regression test scenarios to cover new and existing functionalities
- Management and tracking of test cases and defects with TestRail and Jira (BAM tickets)
- Test coverage of central factoring processes: contact management, contract card, debtors, limit processes, company groups; payment transactions incl. journal entries, rebooking logic, and comment fields; testing and parameterization of the IKV/WKV components incl. reporting; portal tests in the TAS system (login, user management, feedback functions)
- Support for special modules and interfaces: in-house tiles, factoring dashboard, risk evaluation
- Test status maintenance and retest planning (Passed / Blocked / Partially Passed) in close coordination with business departments
- Quality assurance as part of data migration, including validation, deviation analysis, and follow-up documentation
Michael M.
Last position:
IT PROJECT MANAGER (MS Exchange) at Statutory Health Insurance on behalf of Randstad Digital Germany (formerly AUSY Technologies Germany)
Migration from Exchange 2016 to Exchange 2019 and Exchange Online, as well as the introduction of a backup solution and an archiving solution. The goal was a secure, compliant, and high-performance modernization of the email and archiving infrastructure.
Responsibilities as IT PROJECT MANAGER: Overall project management and operational control / Ensuring adherence to costs and resources / Ensuring achievement of project objectives / Ensuring compliance with regulatory requirements and compliance guidelines, including ISMS, ITIL, and data protection regulations / Preparing and delivering management reports for the project sponsors and project committee / Coordinating interdisciplinary teams from Exchange, network, data protection, and IT security / Planning and executing the system migration from Exchange 2016 to Exchange 2019 / Planning and executing the system migration from Exchange 2019 to Exchange Online / Planning and implementing a backup solution for Exchange Online / Coordinating an EU-wide tender for an archiving solution including market analysis with potential vendors / Planning and implementing an archiving solution for Exchange Online / Coordinating and preparing the necessary BAS notifications in the project context / Coordinating and aligning with stakeholders (e.g. business units, external service providers, and suppliers) for requirements definition and implementation
Technical environment: MS Exchange 2016, MS Exchange 2019, MS Exchange Online, MS Office, MS Planner, MS PowerPoint, MS Project, MS Teams
Christian D.
Last position:
Requirements Engineer at Evangelisches Jugend- und Fürsorgewerk (EJF)
- Document analysis
- Preparation and visualization of results (Excel, PowerPoint)
- Consulting and recommendation for requirements analysis and management
- Presentation and handover
Andreas S.
Last position:
Project Management, Development and Test- (Defect-) Management at safarica.com
- Creation and implementation of a multilingual, relational MariaDB database to reflect the requirements of a booking system designed for safaris in Africa
- Testing the front- and backend functionality, registration of clients and suppliers, the editorial system and the payment workflow
- Defect management and documentation via BugHerd
- Implementation of an automatic internal deployment of deliveries provided by an external company via bash scripts
- Coordination of external companies in the function of a project manager (Stakeholder Management)
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
Hans L.
Last position:
Requirements Engineer at REWE Systems GmbH
- Gathering requirements from business units and stakeholders
- Organizing and running workshops
- Creating and supporting user stories (from refinement to rollout) and mapping
- Facilitating Scrum ceremonies
- Identifying and analyzing optimization potentials like the REWE Pick&Go app
- Moderation and communication with service providers
- Requirements engineering in connection with external systems
- DWH/BI solution: loyalty reporting with MicroStrategy
- ITIL (framework for IT service delivery)
- Quality assurance (quality gates) based on ISTQB
Kathleen J.
Last position:
Product Owner, Team Lead, Account Manager at Evia Consulting GmbH & Evia Solutions GmbH
- Product responsibility towards clients, point of contact and account manager
- Leading and coordinating development projects carried out with and for these clients, in addition to product development. This included, for example, the technical migration of a purchased company's IT systems into our own systems.
- Responsible for security and operational infrastructure; coordinating external companies handling related tasks.
- Constant exchange with management to ensure alignment of product and company goals.
- Creating product roadmaps and coordinating with software developers.
- Requirements management and user story refinement.
- Coordinating cross-team work. In addition to my own team, seven other teams worked in the immediate environment.
- Interface management with point-of-sale systems in stores, webshop, and external providers.
- Customer support by providing reports on voucher issuance and redemption, as well as business-relevant reporting for annual financial statements and reserves.
- Participated in the rollout of a new webshop platform in the Netherlands, Belgium, Germany, and Italy, including integrating my products and implementing country-specific custom requirements.
- Team lead: First point of contact for all matters related to software developers.
- Over a period of 1.5 years, took on Scrum Master tasks: removing impediments, preparing and conducting retrospectives, facilitating all Scrum meetings.
- Aligning team work to achieve sprint goals; principle "Outcome over output".
- Restructuring a large team into two smaller Scrum teams.
- Developing team identity, defining vision, mission, and purpose.
- Planning, conducting, and facilitating all Scrum events (review, retrospective, planning).
- Coordinating the takeover of data from third-party systems after company merger.
- Implementing new reporting.
- Early detection of fraud cases; rapid development of sustainable countermeasures in collaboration with software developers.
- Drafting concepts for microservices in an environment of eight development teams; aligning services with business domains.
Atef A.
Last position:
System, load, acceptance and performance testing and QA manager for banking systems
- Test concept, planning and execution
- Coordination of the different test phases
- Project planning within the team, design of the structure and test strategy
- Coordination and review of test activity execution and deviation management
- Derivation of test cases for newly developed features with respect to functional and non-functional requirements and subject matter
- Participation in status meetings
- Documentation of technical components
- Description of the qualitative and quantitative goals of the test measures
- Definition of testable acceptance criteria
- Screening of new and existing customers for negative information
- Evaluation of information and decision on whether a business relationship is still possible
- Assessment of negative information regarding sanction or terror lists
- Assessment of whether individuals have a criminal record or are politically exposed
- Continuous Integration and quality assurance (QA)
- Description of using various testing methods and approaches (static/dynamic tests, functional/non-functional tests, black-/white-box tests)
- Execution of manual and automated tests
- Fixing errors from the testing phases in applications/components
- Integration of test management in the introduction, establishment and expansion of test automation
- Creation of system test documentation
- Reporting risks and issues to technical architects and project management
- Definition of requirements for the test infrastructure
- IT system environment: Windows, SAP, Perl, C, Git, Cloud, Oracle, JavaEE, C#, SOA, XML, JavaScript, HTML5, Angular, JBoss, UML, Linux, Jira, Robot Framework, TypeScript, Python, JMeter, Tosca, Selenium, DWH, AWS Cloud, Doors
Robert M.
Last position:
Backend Developer at Payment Backend
- Integration of partner systems in the payment and credit card environment.
- Development, deployment, and monitoring in a large system landscape.
- Use of a wide range of customer-specific frameworks and tools.
Joachim B.
Last position:
Oracle Consulting and Development at Berufsgenossenschaft Nahrungsmittel & Gastgewerbe (BNG)
- Development and consulting of various web applications for data preparation and distribution using Oracle databases and PL/SQL
- Technologies: Oracle 19, Oracle PL/SQL, Oracle APEX
Discover over 15,000 top freelancers
Statistics of experts using SQuirreL SQL
Aggregated from the professional profiles of matched freelancers.
Experience
28 years
Position duration
2 years
Positions per freelancer
20
Top business areas
Information Technology, Quality Assurance, Product Development
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Project Management, Information Technology, Product Development
Bachelor's degree or higher
77%
Master's degree or higher
54%
Doctorate
8%
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
100%
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 Germany 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 Germany using SQuirreL 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.
SQuirreL 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 (95%)
- Banking and Finance (79%)
- Insurance (53%)
- Media and Entertainment (53%)
- Professional Services (53%)
- Automotive (47%)
- Transportation (47%)
- Government and Administration (47%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What SQuirreL SQL Does
SQuirreL SQL is an open-source graphical SQL client written in Java. It connects to relational databases through JDBC and gives specialists one consistent workspace for writing queries, browsing schemas, inspecting objects and reviewing results. Companies use it when database teams need a practical tool across different vendors without adopting a separate client for every system.
Database Workflows
SQuirreL SQL supports hands-on work with tables, views, indexes, procedures and other database objects. Its object tree and SQL editor help professionals move from schema discovery to controlled query execution and result analysis. It is useful for operational support, migration preparation, data checks and troubleshooting in environments where several database technologies must be compared.
Ecosystem and Tooling
The core ecosystem is built around Java, JDBC drivers and plugins. Strong specialists understand driver configuration, connection aliases, transaction handling, session properties and the differences between database dialects. They may also work with PostgreSQL, Oracle Database, Microsoft SQL Server, MySQL, MariaDB or other JDBC-compatible systems, alongside Git, shell tools and migration software.
Typical Projects
- Investigate slow or unexpected SQL results across database environments
- Compare schemas and validate data during migrations or integrations
- Create repeatable queries for audits, reconciliation and operational checks
- Configure secure connections for local, remote and hybrid teams
- Document database structures for application and support teams
In Germany, SQuirreL SQL expertise can support manufacturing, logistics, finance, healthcare and public-sector systems that connect to established relational databases. Remote collaboration works well when access controls, database environments and documentation are prepared in advance.
When to Hire Expertise
Companies bring in freelance specialists when a database landscape is varied, poorly documented or under delivery pressure. A professional can assess JDBC connectivity, isolate dialect-specific behavior, review risky queries and turn manual investigations into clear procedures. This is especially valuable during migrations, production incidents, vendor changes or audits where mistakes can affect business data.
Signs of Quality
- Explains query plans, transactions, locking and permissions in practical terms
- Distinguishes client problems from driver, network and database-server issues
- Tests queries safely and protects production data from accidental changes
- Documents connection settings, assumptions, findings and rollback steps
- Adapts SQL recommendations to the actual database engine and version
The strongest professionals do not treat SQuirreL SQL as only a query window. They combine careful database investigation with sound SQL, security awareness, clear communication and respect for operational controls.
Frequently asked questions
The facts hiring teams ask for most often when it comes to SQuirreL SQL.
SQuirreL SQL is a Java-based graphical SQL client for connecting to relational databases through JDBC. Companies use it to browse schemas, run and review queries, inspect database objects, compare environments and investigate data issues.
SQuirreL SQL provides a common interface across databases that expose JDBC drivers, which can simplify work in mixed environments. Vendor tools may offer deeper engine-specific features, so the right choice depends on whether portability or specialized administration matters more.
A strong SQuirreL SQL freelancer should understand SQL, JDBC configuration, database permissions, transactions and query performance. Experience with the relevant engines, such as PostgreSQL, Oracle Database, Microsoft SQL Server or MariaDB, is also important.
The required depth depends on the assignment. SQuirreL SQL support for query checks or schema discovery may be focused, while migration validation, production troubleshooting and performance investigations require stronger database knowledge and careful change control.
Yes. SQuirreL SQL work is often suitable for remote collaboration when database access, VPN or bastion arrangements, test environments and documentation are available. German-language communication may help in some teams, but technical requirements and secure access are the key factors.
Ask how the specialist handles JDBC driver issues, unsafe queries, transactions and differences between database dialects. A capable SQuirreL SQL professional explains assumptions, tests changes safely and documents findings instead of relying only on screenshots or ad hoc queries.
SQuirreL SQL can support migration discovery, query testing, schema review and data validation across source and target systems. It is a client tool rather than a complete migration framework, so larger projects may also need dedicated migration, replication or transformation tooling.
A SQuirreL SQL assignment should define the database engines, JDBC drivers, access method, environments and expected deliverables. Freelancers should also clarify whether they are expected to write SQL, investigate performance, validate migrated data or document operational procedures.
The average hourly rate of freelancers in Germany who have used SQuirreL SQL in their recent projects is 89 €, which corresponds to a daily rate of about 712 € based on an 8-hour working day.
Of the freelancers in Germany who have used SQuirreL SQL in their recent projects, 77% hold at least a Bachelor's degree, 54% hold at least a Master's degree, and 8% hold a doctorate.
On average, freelancers in Germany who have used SQuirreL SQL in their recent projects have 28 years of professional experience, with a single engagement typically lasting around 2 years.
The most common languages among freelancers in Germany who have used SQuirreL SQL in their recent projects are German (100%), English (95%), and French (42%).
The most common industries among freelancers in Germany who have used SQuirreL SQL in their recent projects are Information Technology (95%), Banking and Finance (79%), and Insurance (53%).
The most common business areas among freelancers in Germany who have used SQuirreL SQL in their recent projects are Information Technology (95%), Quality Assurance (95%), and Product Development (84%).
Main locations of FRATCH Experts, who have recently used SQuirreL 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 Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
