Full Stack Developers in Cologne
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Meet FRATCH Full Stack Developers in Cologne
Hooman Behmanesh
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.
Marc Smyk
Last position:
Fullstack Developer at PLANT-MY-TREE
PLANT-MY-TREE®-per-order
The application allows Shopify merchants to automate tree-planting orders for each incoming order. By integrating ecological contributions directly into the checkout process, manual work 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 for event-driven capture of order data and integrates the ERP system weclapp 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 using 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, 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
Markus Glagla
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
Florian Rubel
Last position:
Senior Fullstack Developer at Ivii GmbH
- Two-month modernization of the management UI for AI-powered cameras
- Rewrote a complex React application to Vue 3 with single file components
- Set up the core architecture of the Vue application and configured Vite, Pinia, Router, I18n, ESLint, and Prettier
- Custom integration of Leaflet to display detection zones on images
- Assisted with backend extension and authentication adjustments
Cedric Jacob
Last position:
Co-Founder / CTO at Infinite Hooray ApS
- Develop powerful add-ons for customer service systems with innovative Zendesk apps designed to drive business growth, improve efficiency, and enhance customer satisfaction
- Implement full Zendesk solutions and provide hands-on support to bring customer service vision to life
- Combine customer service and technology expertise to address the complexities of delivering top-notch customer service
- Execute Zendesk implementations in 20+ countries and develop AI apps that automate replies
- Maintain a proven track record of success in advancing customer service capabilities
Andreas Beckers
Last position:
Senior Frontend Developer at Roadex
- Development of an app
- Technologies: React Native, Expo, SupaBase, TypeScript, GitHub, Trello
Kay Odenthal
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
Allal Kharaz
Last position:
Java Senior Full Stack Developer at ÖRAG Insurance
- Further development of a policy management system (policy/claims) for ÖRAG legal protection insurance
- Senior software developer in a team of 12 developers
- Migration and modernization of legacy systems: rewrote C and C++ code into Java, refactored Python into Java including optimization and integration into modern architectures
- Development of the following rate calculators for 2024: private, corporate, doctors, farmers, owner-occupied G + H, landlords, motor, associations, top managers, sales agents, specialized criminal, savings bank, municipal, BayGT, doctors, Dehoga
- Used technologies: Java 8/11, Java EE, WebLogic, JPA, JTA, CI, CD, Jenkins, DB2, Maven, Git (Bitbucket), Eclipse, JUnit, Mockito, Jira, SonarQube, Scrum, Apache Wicket, Workflow
Alexander Stier
Last position:
TYPO3 Senior Fullstack Developer, Backend & Frontend at Vergleich.de Gesellschaft für Verbraucherinformation mbH via HALIAN GmbH
- Typoscript
- Extbase
- Fluid
- Typescript
- requireJS
- WebVital
Jacqueline Krech
Last position:
OTTO
- Design, development, and monitoring of microservices
- Migrating functions from a monolithic system into separate microservices
- Designing and implementing new microservices (backend and frontend)
- Setting up and maintaining a CI/CD pipeline (GitHub Actions)
- Configuring cloud infrastructure with AWS CDK and Terraform
- Designing and implementing event-driven communication with AWS SNS/SQS and Apache Kafka
- Ensuring code quality through Test Driven Development (TDD), static code analysis, and Clean Code
Discover over 15,000 top freelancers
Full Stack Developers statistics
Aggregated from the professional profiles of matched freelancers.
Experience
19 years (Germany: 16 years)
Position duration
2.4 years (Germany: 2.9 years)
Positions per freelancer
10 (Germany: 12)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Retail, Automotive
Certification focus areas
Information Technology, Product Development, Business Intelligence
Bachelor's degree or higher
100% (Germany: 89%)
Master's degree or higher
60% (Germany: 47%)
Certifications per freelancer
2 (Germany: 1)
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 97%)
Based on our profile pool as of 27 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this role 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 for Full Stack Developers in Cologne
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 27 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the role
Engineering End-to-End Digital Solutions
A freelance full stack developer takes complete ownership of your web applications, from the user interface to the database. By managing both the frontend presentation layer and the backend logic, these engineers eliminate communication silos between separate development teams. This holistic approach ensures faster deployment cycles, streamlined code integration, and a more cohesive architecture for your software products.
Core Technologies and Modern Tech Stacks
Modern web development requires deep expertise in a variety of programming languages, libraries, and deployment tools. Experienced software engineers bring immediate proficiency in the tools necessary to build scalable, high-performance applications.
- Frontend development using React, Angular, Vue.js, and TypeScript
- Backend engineering with Node.js, Python, Java, Go, or .NET
- Database management using PostgreSQL, MongoDB, Redis, and MySQL
- Cloud infrastructure and DevOps tools like AWS, Docker, and Kubernetes
- API design and integration using RESTful standards and GraphQL
Bridging Frontend Experience and Backend Performance
Strong developers do not just write code; they balance user experience with system efficiency. On the client side, they focus on responsive design, state management, and web performance. On the server side, they optimize database queries, implement secure authentication protocols, and design scalable architectures that handle traffic spikes without latency.
Supporting the Digital Ecosystem in Cologne
Companies in the Rhineland region, from established media hubs to rising insurtech startups, rely on flexible development talent to accelerate their roadmap. Freelance software programmers in Cologne help local businesses modernize legacy systems, migrate services to the cloud, and build minimum viable products. Whether working fully remote or collaborating on-site in the vibrant Belgian Quarter, these professionals adapt quickly to local team dynamics and agile workflows.
Frequently asked questions
Curious about Full Stack Developers? Here are the answers that come up again and again.
A freelance full stack developer handles both the client-side frontend and the server-side backend of web applications. They write clean code for user interfaces, design databases, build robust APIs, and configure cloud hosting environments. This complete overview allows them to build entire software features independently.
Most freelance full stack developers in Cologne work in a hybrid setup, combining remote coding sessions with occasional on-site meetings. Companies in the Rhineland region appreciate having local developers who can visit the office for sprint planning or architecture workshops.
While many tech teams in Germany use English as their primary working language, speaking German is a significant advantage for a full stack developer in Cologne. This is particularly true when collaborating with local mid-sized businesses or public sector clients.
Hiring a freelance full stack developer is ideal when you need to scale up a team quickly for a specific project launch or cover a critical skill gap. Freelancers bring diverse experience from multiple industries, allowing them to integrate into existing agile workflows without a long onboarding process.
While a full stack software developer understands the entire application, many have a slight preference or deeper expertise in one area, such as React on the frontend or Node.js on the backend. It is best to clarify which layer of your architecture requires the most focus before hiring.
A top-tier freelance developer is evaluated by their portfolio of past projects, code quality, and ability to solve complex architectural problems. Reviewing their GitHub repositories, technical case studies, and references from previous clients provides clear proof of their engineering capabilities.
The media, e-commerce, and logistics sectors in Cologne heavily rely on agile software engineering talent to stay competitive. Freelancers help these businesses build custom shop systems, optimize supply chain portals, and deploy high-traffic content platforms.
A professional full stack engineer integrates seamlessly with your existing toolchain. They typically use Git for version control, Jira or Trello for project tracking, Slack for daily communication, and CI/CD pipelines to deploy clean, tested code.
The average hourly rate for Full Stack Developers in Cologne is 95 €, which corresponds to a daily rate of about 761 € based on an 8-hour working day.
Of the freelancers working as Full Stack Developers in Cologne, 100% hold at least a Bachelor's degree and 60% hold at least a Master's degree.
On average, freelancers working as Full Stack Developers in Cologne have 19 years of professional experience, with a single engagement typically lasting around 2.4 years.
The most common languages among freelancers working as Full Stack Developers in Cologne are German (100%), English (100%), and French (30%).
The most common industries among freelancers working as Full Stack Developers in Cologne are Information Technology (80%), Retail (80%), and Automotive (50%).
The most common business areas among freelancers working as Full Stack Developers in Cologne are Information Technology (100%), Product Development (100%), and Quality Assurance (40%).
FRATCH Full Stack Developers main locations
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.
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Philipp Thomaschewski
FRATCH CEO
