HSQLDB Experts in Germany
to build reliable data systems with fast, precise AI matchingHire experts who design embedded and server-based HSQLDB solutions, tune SQL workloads and connect Java applications through JDBC. FRATCH matches you quickly with vetted, available freelancers whose skills fit your project.
Meet FRATCH Experts in Germany, who have recently used HSQLDB
Humayun S.
Last position:
Senior Test Manager - Lead at Star Finanz GmbH
- QA Lead for end-to-end quality assurance of the Sparkasse & Sparkasse Business banking apps (iOS/Android); design and implementation of the Test Strategy including functional testing, regression testing, and UAT for eID, Push Notifications, and white-label components
- Creation and maintenance of test concepts and test plans in TestRail; structured Defect Management and error analysis; stakeholder management and risk management for the early identification of critical quality risks
- Accessibility Testing according to WCAG 2.1 (iOS/Android); coordination of AI-supported test automation and optimization of test processes to shorten release cycles
- Release Management: planning, management, and coordination of all test activities; status reporting to management and stakeholders; quality assessment of releases and release recommendations in an Agile/Scrum environment
- Challenge: Highly complex build and release process across several Sparkasse institutions; close coordination with the DevOps team to stabilize the CI/CD pipeline and ensure reproducible test builds before every release.
Tools: Jira, Confluence, TestRail, Android Studio, Xcode, Firebase, Jenkins, GA4
- Success: Successful launch of the eID authentication process - quality assurance ensured for 50+ Sparkasse institutions
Tezcan D.
Last position:
Solution Architect / Project Manager at German Football Association
- Overall responsibility for the project lifecycle from scope definition to completion
- Close collaboration with platform teams, IT leaders, and external service providers
- Application of SAFe principles and structured sprint work
- Creation of a migration roadmap with clear milestones
- Monitoring of the lifecycle: onboarding, repository migration, replication of permissions, and system tests
- Visualization of the architecture with PlantUML and Gliffy as well as documentation in Confluence
- Regular status reports and running knowledge transfer sessions
Frank B.
Last position:
System Engineer at Frequentis Comsoft
- Migrate company software to RHEL10
- Development in Bash, Python, C, Ansible
Sven H.
Last position:
Process Architect (Symbio, Signavio) at IT service provider for an international premium automaker
- Analyzing, aligning and modeling business processes (BPMN 2.0) for the 'The New Retail' program in the areas of invoicing, tax, customs and accounting
- Tracking user stories and their impact on processes
- Point of contact for preparing the tool migration from Symbio to Signavio for the mentioned areas
- Power user after the introduction of Signavio, point of contact and coach for other process modelers
Nikunjkumar P.
Last position:
Senior Java Backend Developer at Questax Professionals GmbH
- Provide the Price Listing Service team with prices for all cars and vans in different markets
- Adapt market-specific requirements such as taxes, government subsidies, campaigns
- Import and synchronize new prices for all new and existing cars and store them in the Redis datastore
- Support our product and on-call duty
- Daily business, development of new features, bug fixing
- Pair programming, code review, mob programming
- Develop POCs for new ideas
- Maintain and extend the backend
- DevOps tasks
- Run Kubernetes updates
- Adjust and further develop Kubernetes resources
- Develop and adapt Helm charts
- Adapt and update ArgoCD
- Maintain, adapt, and improve CI/CD
Manish K.
Last position:
Freelance Senior Solutions Architect at YoungIT
- Worked with a UK based organisation offering a range of free sexual health services such as STI testing, treatment and contraception across the UK
- Created a Liferay DXP based customer facing portal (version 7.4) over Liferay Experience Cloud
- Designed and developed Liferay modules
- Managed Liferay Experience Cloud and release management
- Coordinated with different teams and helped other team members on Liferay challenges
- Engaged in discussions with business and stakeholders on expectations
- Implemented architectural best practices
Anton K.
Last position:
Head of Overall Technical Integration NSC / Hadoop Cloud Development at IABG
Head of overall technical integration NSC (National Secure Cloud, project with approx. 60 employees).
Technical integration of all subprojects into one product, definition of interfaces and basic components of a cloud including hardware, technical architecture of the IABG platform.
Development of a Cloud Management Platform (CMP) capable of creating private/mixed clouds of any complexity based on a textual description with one click or interactively.
CMP also includes the complete hardware management lifecycle.
Kubernetes, OpenStack and Hadoop are used as the foundation.
The management layer includes Harbor, Gitea, Longhorn, Keycloak, Rancher and Jenkins, which are configured automatically.
Private cloud can run any customer workloads, including a full Hadoop layer with HDFS, Spark, MapReduce, Mesos, HBase and around 20 additional ML/DL technologies.
Hadoop worker clusters can also be installed automatically without Kubernetes on bare metal or commodity hardware.
OpenStack with Nova, Neutron, Ironic, Swift, Cinder, Ceph.
Development of a Java application Rudi: SOAP, REST, containers, DB.
Technologies: Kubernetes (K3s, Rke2, Minikube, Harbor, Gitea, Jenkins, Longhorn, Keycloak, Rancher), OpenStack (Nova, Neutron, Keystone, Swift, Ceph, Cinder, Sahara, Magnum, Kayobe, Kolla, Bigrost, Ironic), Hadoop (HDFS, Ambari, Solr, Livy, Ranger, YARN, Tez, HBase, Kafka, Hive, Zookeeper, MapReduce, Spark, Oozie, Flink), virtualization (Kubernetes (K3S), VMware, Oracle), scripting (Ansible, Puppet, Juju, Shell, Groovy, Gradle, Maven).
Syamala H.
Last position:
Fullstack Developer at BLG Logistics Group
As part of developing this project, various apps were developed for an IBM portal environment based on portlets and Spring Boot services, as well as the setup of a BI platform based on QlikView
Full-stack development of applications, technical analysis, refinement of requirements with the business department, coordination with the customer, DevOps
Team size: 8 people
Technology: Java 11.0, Maven, Git, Spring, Hibernate, JUNIT, Mockito, React, Jira, SQL, Spring Boot, CD/CI Jenkins, Kanban, Rest Api, Oracle
Environment: Eclipse, IBM Rational Application Developer
James C.
Last position:
Freelance Android Developer at Normalis
- Working on Telecommunication Apps on Android under NDA for the Military
- Participation in the development of backend services (Spring, Java)
- Android Development, Kotlin, Compose, REST, JSON, State-Machines, Android Studio, IP Communication, Cybersecurity, Agile
Michael K.
Last position:
Atruvia AG
- Further development of framework components and services in the Enterprise Banking Control Platform (EGP Framework), a set of cross-cutting libraries and services for all bounded context scopes of the platform.
- Migration from Java 17 to Java 21 and from Spring Boot 3.2 to 3.4 in about 80 library and service repositories (updating Maven POMs, Dockerfiles, Jenkins pipelines, source code migration, test updates).
- Writing unit and integration tests with JUnit and JGiven.
- Performing and analyzing performance measurements with Dynatrace.
- Enhancing multi-stage CI/CD pipelines (unit tests, security analyses, Docker builds, Harbor deployments, ...).
- Tech stack used: Java (90%), Python (10%), Spring Boot, JPA/Hibernate, JGiven, OpenAPI, Camunda 7, Podman, OpenShift/Kubernetes, Oracle DB, SonarQube, Dynatrace, Jenkins, Harbor, Bitbucket, Jira, Confluence.
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
Jürgen B.
Last position:
Software Developer at Inform AG
- Coaching junior developers
- Further development and customer-specific extensions of a standard software product (microservices (DDD) and partly monolith)
- Interface extensions
- Web services
- Test automation
- Design
- Technologies used: Java8, Java17, TypeScript, Python, PostgreSQL, Spring (Integration, Data, Boot), JPA, AWS (Cloud, Lambda, EC2, SQS/SNS), Microservices, Fitnesse/Cucumber, Gitlab
Elvir B.
Last position:
Software Architect and Software Developer at Noctica IT GmbH
- NocTime time tracking, workshop planner, meal delivery service app
- LLM-based chat bot to control the NocTime time tracking system via voice input
- New and further development of customer solutions based on the Noctica SAS app framework
- Technologies: Java 17, Spring Boot, JPA, Hibernate, JavaScript, TypeScript, Angular 20, Angular Material, React, C#, Docker, Bash, Git, GitLab, RedMine, SQL, DBeaver, MariaDB, PostgreSQL, Python, TensorFlow, Ollama, various LLMs
Jörg-Ulrich H.
Last position:
Data flows for health insurance providers
- Further development and creation of data flows for health insurance providers
- Data management across various storage systems (DB2, MSSQL, PostgreSQL, S3, custom APIs, ...)
- Documentation and training
- Planning and deployment of NiFi 2.x (major upgrade)
- Integrating Grafana for visualization, monitoring, and alerting
- Extensive use of the NiFi API to continuously monitor the system and its components
Radoslav Y.
Last position:
Senior Software Engineer at Radoslav Yankov – Software Engineering
Discover over 15,000 top freelancers
Statistics of experts using HSQLDB
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
1.5 years
Positions per freelancer
18
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Automotive, Banking and Finance
Certification focus areas
Information Technology, Product Development, Operations
Bachelor's degree or higher
90%
Master's degree or higher
70%
Doctorate
20%
Certifications per freelancer
3
Most common languages
German, English, Russian
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 HSQLDB
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.
HSQLDB 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 (100%)
- Automotive (67%)
- Banking and Finance (60%)
- Insurance (53%)
- Transportation (47%)
- Telecommunication (47%)
- Retail (40%)
- Aerospace and Defense (33%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Database Engine
HSQLDB, also known as HyperSQL, is a lightweight relational database written in Java. It supports SQL standards, transactions, indexes, views and stored procedures while running in embedded, in-process or server modes. Teams use it when an application needs dependable relational storage without the operational weight of a large database installation.
Typical Systems
HSQLDB fits software that needs local persistence, controlled test data or a compact database service.
- Embedded storage for Java desktop and backend applications
- Automated tests with isolated, repeatable relational data
- Prototypes and internal tools that need SQL from the start
- Portable services that run across development and production environments
- Data migration and compatibility checks for larger database systems
Ecosystem Skills
Strong HSQLDB specialists work comfortably across the Java ecosystem. They use JDBC, connection pools, Maven or Gradle, and common persistence options such as Hibernate or Spring-based data access. They also understand SQL schema design, transaction boundaries, locking, backup procedures and the differences between embedded and server operation.
When Expertise Helps
Companies often bring in freelance expertise when an existing HSQLDB setup becomes difficult to maintain or when a Java application needs a dependable local database. Specialists can replace fragile file handling, resolve locking or performance problems, prepare a migration path, and align schemas across test and production environments. In Germany, remote work is often practical, while on-site collaboration may help when the database supports a regulated or operationally sensitive system.
Delivery Focus
A capable professional starts by clarifying access patterns, data volume, consistency needs and the expected runtime mode. They deliver a maintainable schema, migration scripts, connection configuration, test coverage and clear operating instructions. Good work also includes safe shutdown handling, recovery planning and checks that prevent an embedded database file from becoming an unmanaged single point of failure.
Quality Signals
Look for experience with HSQLDB in real Java applications, not only with generic SQL. Ask how the specialist handles concurrent access, transaction isolation, file permissions, backups and upgrades. Useful evidence includes a clear explanation of query plans, reproducible tests, documented decisions and a design that can move from an embedded setup to a server deployment when the product grows.
Frequently asked questions
What clients ask us most about HSQLDB — answered in short.
HSQLDB is a Java-based relational database used for embedded application storage, automated tests, prototypes and compact server deployments. It provides SQL transactions and indexing without requiring a separate database service in embedded mode.
HSQLDB is often weighed against SQLite and H2 for local or lightweight relational storage. Its Java integration, SQL standards support and flexible embedded or server modes can be strong advantages, while the best choice depends on runtime language, deployment model and compatibility requirements.
A strong HSQLDB specialist should understand Java, JDBC, SQL schema design and transaction handling. Experience with Maven or Gradle, connection pools, Hibernate, Spring data access, testing frameworks and database migration tools is also valuable.
The right HSQLDB experience depends on the project’s risk and complexity. A simple test fixture may need focused SQL and Java knowledge, while a shared production service calls for deeper skills in concurrency, recovery, backup design, migration and operational monitoring.
HSQLDB projects are usually suitable for remote collaboration because schemas, migrations, tests and configuration can be reviewed in version control. On-site work may still be useful when the database is tied to restricted environments, physical systems or teams that require German-language workshops.
Ask a HSQLDB professional to explain the choice between embedded and server modes for your workload. Review examples of schema migrations, transaction handling, concurrent access tests and recovery procedures, and look for reasoning that addresses your application rather than generic database advice.
HSQLDB can support development, testing and selected production workloads when its operating model matches the application. A specialist should validate concurrency, durability, backup routines, file access and deployment processes before recommending it for a critical production system.
A freelancer may choose HyperSQL Database Engine when a Java application benefits from a small, portable relational database with strong SQL support. HyperSQL, commonly called HSQLDB, is useful when keeping setup simple matters but the project still needs transactions, queries and structured schemas.
The average hourly rate of freelancers in Germany who have used HSQLDB in their recent projects is 102 €, which corresponds to a daily rate of about 817 € based on an 8-hour working day.
Of the freelancers in Germany who have used HSQLDB in their recent projects, 90% hold at least a Bachelor's degree, 70% hold at least a Master's degree, and 20% hold a doctorate.
On average, freelancers in Germany who have used HSQLDB in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 1.5 years.
The most common languages among freelancers in Germany who have used HSQLDB in their recent projects are German (100%), English (93%), and Russian (13%).
The most common industries among freelancers in Germany who have used HSQLDB in their recent projects are Information Technology (100%), Automotive (67%), and Banking and Finance (60%).
The most common business areas among freelancers in Germany who have used HSQLDB in their recent projects are Information Technology (100%), Product Development (93%), and Quality Assurance (67%).
Main locations of FRATCH Experts, who have recently used HSQLDB
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
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Philipp Thomaschewski
FRATCH CEO
