IntelliJ IDEA Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used IntelliJ IDEA
Hooman B.
Last position:
Fullstack Developer at Möbel Roller GmbH
- Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
- Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
- Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
- Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
- Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
- Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
- Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
- Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
- Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.
Christoph S.
Last position:
Test Manager at Logistics
- Coordination and planning, execution, documentation, and analysis of test cases
- Development of test concepts considering best practices (e.g., test pyramid) with a focus on reliable, automatable test runs
- Implementation and maintenance of test cases according to the test concepts
- Technologies: Citrix Workspace, Shopify, Jira, Xray, MS Teams, MS SharePoint, Confluence, MS Office 365
Marc S.
Last position:
Fullstack Developer at PLANT-MY-TREE
PLANT-MY-TREE®-per-order
The application enables Shopify merchants to automatically place tree-planting orders for every incoming order. By integrating ecological contributions directly into the purchase process, the manual effort for tracking and billing reforestation initiatives is eliminated. The system increases transparency for end customers through real-time visualizations of the ecological impact directly in the storefront. The architecture is based on a modular monolith with Spring Boot in the backend and an integrated React app inside the Shopify admin area. The solution uses webhooks to capture order data in an event-driven way and integrates the weclapp ERP system for automated monthly invoicing. An app proxy mechanism provides dynamic statistics such as CO2 compensation and planted trees without any performance loss for the merchant shop.
Tasks:
- Design of the modular software architecture based on Spring Modulith to ensure high maintainability
- Development of the event-driven business logic for evaluating Shopify orders via webhooks
- Implementation of automated invoicing by connecting the weclapp REST API
- Building the frontend using React Router and Shopify App Bridge for native integration
- Design of the database model and implementation of the persistence layer with JPA/Hibernate and Prisma
- Integration of internationalization processes for global use in the frontend and email communication
- Automation of deployment processes using Docker and GitLab CI/CD
Project skills: Java 25, Spring Boot, Spring Security, Spring Modulith, Hibernate, JPA, REST API, PostgreSQL, Maven, Liquibase, React, TypeScript, React Router, Vite, Node.js, Prisma, Zod, Docker, Docker Compose, GitLab CI/CD, Shopify CLI, Shopify App Bridge, Polaris, weclapp, i18next, Lombok, Vitest
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
Markus G.
Last position:
Full Stack Developer at REWE Digital
- A warehouse valuation system was reimplemented using Java, Spring Boot, and Camunda. The backend solution focuses on integration and batch calculations, the frontend on managing formulas and reviewing results.
- Java 21
- Spring Boot
- JPA
- Maven
- REST
- Kafka
- PostgreSQL
- DB2
- Liquibase
- Google Cloud Storage
- Keycloak
- GitLab CI/CD
- Helm
- Terragrunt
- SonarQube
- Angular
- IntelliJ
- JUnit 5
- Mockito
- Open API
Predrag P.
Last position:
Test Developer | Test Automator at CreditReform
Technologies: Java 25, Selenium, Insomnia, SSO, GitLab, Jenkins, Docker, Kubernetes, Jira, IntelliJ, Nexus, Oracle, MariaDB, Spring Boot, Grafana, Concept Board, Vue.js, OpenAPI, Kotlin. Implementation, maintenance, and extension of automated end-to-end regression tests for UI and API interfaces. Appropriate and targeted test automation across multiple software products, including Java-based Windows applications. Automating business processes with Selenium, reset jobs, and DB import jobs, as well as creating test concepts, test case descriptions, and structured bug reporting.
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
Louis N.
Last position:
Specialist in Adobe Experience Manager & Microservices at Nguenkam Consulting & Engineering
Java 11/21
Springboot
Swagger/OpenApi
Azure Pipelines
Trivy Integration
Apache Sling
OSGI
Java Content Repository (JCR)
Apache Jackrabbit Oak
Adobe HTL
GraphQL
Maven
GitLab
IntelliJ
Azure Cloud
Azure DevOps
Terraform
AEM specialist in the Scrum team
Development and deployment of microservices via Open API interfaces
Operation of microservices in the Azure Cloud
Implementation of AEM modules and integration with microservices
Member of the knowledge transfer team and a backend coordination team
Jyothikrishna S.
Last position:
Senior Back-end Engineer at RLE Engineering and Services GmbH
- Works at Ford Motor Company as Senior Back-end Developer on contract via outsourcing
- Designed and developed REST APIs based on the analyzed requirements and technical standards
- Investigated issues and defects to determine root causes and formulate corrective action measures
- Participated in QA, stage, and production release activities
- Conducted code reviews for performance improvement
- Provided monitoring and support using GCP
- Used test driven and behaviour driven development approaches
- Took part in agile ceremonies
Jacqueline H.
Last position:
Kitchen Appliance Manufacturer
Setting up and enhancing an international subscription management system
Migrating and decommissioning a Hybris-SAP system and integrating Zuora
Implementing numerous interfaces to various systems (external and internal)
Setting up and improving monitoring with Grafana, Prometheus, and Databricks
Introducing logging with Loki
Implementing business requirements using jQuery, Thymeleaf, Spring Boot, Java, Go, and Python
Adjusting and extending the GitLab CI pipelines
Setting up and extending infrastructure as code with Terraform and ArgoCD on AWS
Setting up and running E2E and performance tests
Expanding the Databricks business intelligence solution to provide various KPIs
Responsibilities: Architecture, DevOps, development, unit tests, coaching employees and apprentices, E2E, smoke, and integration tests, agile methods consulting (Kanban, Scrum)
Technologies and methods: Java, Go, Kotlin, Node.js, Spring Boot, SOAP/REST, Quarkus, Thymeleaf, Vaadin, Slack, Jira, Confluence, IntelliJ, GitLab, SQS, Kafka, AWS, Kubernetes, Terraform, Maven, Gradle, GitLab CI, Databricks
Vishali T.
Last position:
Senior Analyst at Accenture
- Facilitated data retrieval for first-assist applications through an interface that fetches content based on client input criteria and loads it into the database via batch processing.
Kay O.
Last position:
Fullstack Developer at INIT GmbH
- Development of monitoring and control systems for public transport
- Development of a platform for real-time monitoring of passenger information and ticketing systems and an application for remote control and status monitoring of access systems
- Development of dynamic forms, complex tables, real-time dashboards (SignalR), and reusable components in the frontend (using Storybook)
- Implementation of REST interfaces in the backend
- Deployment to Microsoft Azure Cloud
- Technologies used: Angular 20, Angular Material 3, Dev Extreme, Storybook, C#/.NET 10
Last position:
Rewe Digital
- Creation of Spring Boot integration tests
- Creation of JUnit tests for the coupon system
- Creation of component tests for Kafka topics
- Creation of CI/CD pipeline scripts
- Creation of UI tests with Playwright
- Creation of UI tests with Cypress
- Review of developer unit tests
- Planning the test architecture for integration tests
- Creation of the test automation concept
- Evaluation and creation of test reports
Discover over 15,000 top freelancers
Statistics of experts using IntelliJ IDEA
Aggregated from the professional profiles of matched freelancers.
Experience
17 years (Germany: 19 years)
Position duration
1.7 years (Germany: 1.9 years)
Positions per freelancer
15 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Information Technology, Product Development, Marketing
Bachelor's degree or higher
92%
Master's degree or higher
58% (Germany: 53%)
Doctorate
8%
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
100% (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 IntelliJ IDEA
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.
IntelliJ IDEA 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 (59%)
- Insurance (53%)
- Retail (53%)
- Automotive (47%)
- Transportation (47%)
- Government and Administration (35%)
- Telecommunication (35%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What IntelliJ IDEA is
IntelliJ IDEA is JetBrains’ integrated development environment for building, testing and maintaining software. It is widely used for Java and Kotlin work, while also supporting languages such as JavaScript, TypeScript, SQL and Python through built-in features or plugins. Its editor, project model and code analysis help teams work across complex codebases.
Core capabilities
IntelliJ IDEA combines intelligent completion with navigation, refactoring and real-time inspections. Experts use it to trace dependencies, generate safe code changes, run tests and debug applications from one workspace. Advanced support covers build tools, version control, databases, containers and application frameworks.
Ecosystem and tooling
The IDE fits into established JVM and web development workflows. Strong professionals commonly work with:
- Java, Kotlin, Spring Boot and Jakarta EE
- Maven, Gradle and multi-module repositories
- Git, GitHub, GitLab and code review workflows
- JUnit, Mockito, Docker and Kubernetes
- SQL clients, REST tools and database consoles
Where companies use it
Companies use IntelliJ IDEA for backend services, enterprise applications, APIs, mobile projects and full-stack products. It supports work from early implementation through maintenance, modernization and production troubleshooting. In Cologne, teams across software, media, logistics and industrial businesses may use it within local, hybrid or distributed delivery setups.
When freelance expertise helps
External specialists are useful when an IDE setup slows delivery or a codebase has become difficult to navigate. Typical needs include:
- Standardizing project settings, inspections and shared formatting
- Migrating Java projects or adopting Kotlin
- Improving Maven or Gradle builds and test execution
- Resolving indexing, debugging or plugin conflicts
- Coaching teams on refactoring and efficient navigation
What strong experts bring
The best IntelliJ IDEA professionals understand software architecture, not just keyboard shortcuts. They connect IDE configuration with build reproducibility, repository conventions, testing strategy and team workflows. They can explain trade-offs clearly, work in English or German when needed, and leave behind documented settings that remain useful after the engagement ends.
Frequently asked questions
Before you brief your next project: the most common questions about IntelliJ IDEA.
IntelliJ IDEA is used to create, test, debug and maintain software, especially Java and Kotlin applications. It also supports web technologies, databases, build systems and cloud tooling, making it useful across backend and full-stack projects.
IntelliJ IDEA offers deep project analysis, refactoring and JVM integration out of the box. Eclipse remains strong in established Java environments, while Visual Studio Code is lighter and highly extensible; the right choice depends on project complexity, team habits and required tooling.
A strong IntelliJ IDEA specialist should understand Java or Kotlin, Git, Maven or Gradle, testing and debugging. Experience with Spring Boot, databases, Docker, CI pipelines and team coding standards is also valuable because the IDE is part of a wider delivery workflow.
The required depth depends on the assignment. A configuration cleanup may need focused IDE knowledge, while a migration or performance issue calls for someone who understands the build, runtime, architecture and repository history behind the IntelliJ IDEA setup.
Yes, IntelliJ IDEA work is well suited to remote collaboration when repositories, environments and communication practices are accessible. On-site sessions in Cologne can still help with workshops, onboarding or diagnosing team-wide workflow problems.
Ask how the specialist would improve a real project setup, investigate slow indexing or design shared IDE settings. A capable IntelliJ IDEA professional explains the effect on builds, tests, code quality and team consistency rather than focusing only on personal shortcuts.
IntelliJ IDEA supports mixed Java and Kotlin projects with navigation, inspections, refactoring and build integration. The specialist should also understand interoperability, Gradle or Maven configuration, test conventions and the risks involved in gradually adopting Kotlin.
A typical IntelliJ IDEA engagement can deliver shared project settings, plugin guidance, build and test improvements, migration support or documented team practices. The exact output may include a cleaned repository configuration, troubleshooting report, onboarding guide or coaching session.
The average hourly rate of freelancers in Cologne, Germany who have used IntelliJ IDEA in their recent projects is 86 €, which corresponds to a daily rate of about 690 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used IntelliJ IDEA in their recent projects, 92% hold at least a Bachelor's degree, 58% hold at least a Master's degree, and 8% hold a doctorate.
On average, freelancers in Cologne, Germany who have used IntelliJ IDEA in their recent projects have 17 years of professional experience, with a single engagement typically lasting around 1.7 years.
The most common languages among freelancers in Cologne, Germany who have used IntelliJ IDEA in their recent projects are German (100%), English (100%), and French (24%).
The most common industries among freelancers in Cologne, Germany who have used IntelliJ IDEA in their recent projects are Information Technology (88%), Banking and Finance (59%), and Insurance (53%).
The most common business areas among freelancers in Cologne, Germany who have used IntelliJ IDEA in their recent projects are Information Technology (100%), Product Development (82%), and Quality Assurance (82%).
Main locations of FRATCH Experts, who have recently used IntelliJ IDEA
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 
Frankfurt 
Stuttgart 
Dusseldorf 
Dortmund Countries:
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