CSS Experts in Cologne
matched in minutesHire experts who create responsive interfaces, accessible design systems and maintainable styling with CSS, Sass and modern frontend workflows. FRATCH connects you with vetted, available freelancers through fast, precise AI matching.
Meet FRATCH Experts in Cologne, who have recently used CSS
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
Piet A.
Last position:
Founder at RubberMetrics.com
- Self-hosted table tennis equipment platform.
- Development of a custom “Racket Builder” that uses a co-evolutionary genetic algorithm to identify, evaluate, and recommend the optimal combinations of racket blades and rubbers based on physics heuristics and player data within a search space of over 4 billion combinations.
- Development of a custom fully automated web crawler to capture equipment specifications, integrating an automated pipeline for image normalization as well as data harmonization via DeepSeek.
- Cloudflare Edge Workers written in Rust to perform low-latency data searches and offload computationally intensive simulations from the main server.
- High performance and accessibility standards across a large Nuxt 4 codebase achieving 95–100/100/100 Lighthouse scores.
Patrick D.
Last position:
Fullstack Developer
- SPA for automated communication of medical findings with role-based access (Sanctum)
- Server-side LLM integration (OpenRouter) with structured processing
- Automated sending via SMS/voice call (Twilio, ElevenLabs) with queue + status retry
- Full test coverage with 80+ documented test cases
Technologies: PHP, Laravel, LLM API (OpenRouter), Twilio, ElevenLabs, Laravel Sanctum, PHPUnit, Playwright, Docker, REST
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
Yaroslav S.
Last position:
Senior Low-Code Consultant at Freelancer
Structured analysis and evaluation of business processes
Gathering, documenting, and prioritizing requirements
Creating business-friendly and technically executable process models
Use of Camunda tools
Deriving requirements and interfaces from BPMN diagrams
Coordination with stakeholders and business units
Translating business requirements into technical solution designs
Implementing efficient and tailored applications
Systematic collection, analysis, and documentation of requirements
Prioritizing and validating requirements in close collaboration with stakeholders
Alignment between business and development to ensure shared objectives
Creating use cases, user stories, and acceptance criteria
Continuous requirements and change management throughout the project lifecycle
Define project goals and create project plans
Delegate tasks and monitor project progress
Monitor budgets and inform stakeholders
Mendix: Architecture, development, and maintenance of custom applications (Microflows, Domain Model, Security, XPath)
Modeling Mendix workflows for process optimization
Develop scalable apps with Mendix including REST/SOAP integration with SAP, SQL, Azure & SharePoint
UI design for Mendix using Atlas UI, Fluent UI, HTML, CSS, JavaScript
Develop web & mobile apps with Mendix using agile methods (Scrum, Kanban)
Implement business logic with Mendix Microflows and Nanoflows
Performance optimization and architecture improvements for Mendix applications
Conduct Mendix training
Create technical documentation and best practices for Mendix
Coaching and mentoring for low-code development with Mendix
Ahmed M.
Last position:
Senior Full-Stack Engineer at NEW NETZ
- Built more than 15 frontend applications and more than 10 backend services across internal tools, back-office workflows, and external portals for installers and end customers
- Automate build and release workflows with TypeScript and Azure DevOps
- Mentor junior engineers through code reviews and technical guidance
- Integrate AI-assisted and agentic development practices into engineering workflows
- Coordinate user experience decisions with UX designers
Tech Stack: Claude Code, Codex, AWS (S3, Lambda, AppSync, Resolver), Next.js App Router, ReactJS, NuxtJS, Vue.js, Storybook, JavaScript, TypeScript, GraphQL, Azure DevOps
Muhammad J.
Last position:
Embedded Linux Intern – IoT Sensor Prototype Development at DHL
- Built a modular C++ 20 embedded Linux acquisition system on a Raspberry Pi, synchronizing IMU and dual-camera data streams to sub-millisecond accuracy.
- Integrated retro-reflective and contrast sensors to trigger acquisition and detect gaps between sorter rails.
- Implemented SPI & I2C sensor communication, GPIO interrupt handling with libgpiod, and CSV & JSON output.
- Designed a multi-threaded acquisition pipeline and an SPSC queue between acquisition and writer threads.
- Built a Python/HTML/CSS based web-server and validated the prototype in a DHL warehouse for defect detection.
- Documented software behavior, configuration, and results for maintainable handover and further development.
Vitaliy M.
Last position:
Team Lead Development with a focus on lead generation at one of Germany's largest insurance companies
- Backend WordPress web development.
Rainer L.
Last position:
Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer at Techniker Krankenkasse
Automation of the database major / minor releases for the TKeasy project
Concept for database major / minor release automation
As-is analysis
Evaluation of Redgate Flyway functionality
Concept creation
Products: Redgate Flyway, GitHub, Quest, Erwin Data Modeller, Oracle, Atlassian Jira, Atlassian Confluence
Skills: Docker, Continuous Delivery, Continuous Integration, Redgate Flyway, Major Releases, Minor Releases
Kai W.
Last position:
Salesforce Account Engagement at Memodo GmbH
Consulting on and implementation of technical processes in CRM and email marketing, international project management
Nawfal C.
Last position:
Internship in Software Development at Haeger Consulting
- working in a team using an agile method (Scrum)
- Backend development in Java (Spring Boot)
- Frontend development in Angular
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
Joaquim L.
Last position:
Freelance ABAP Developer, Logistics at Cheplapharm
- Tested integration of TIBCO EBX with SAP S/4HANA via TIBCO BusinessWorks – proof of concept
- Implemented use case: communication between TIBCO EBX and SAP S/4HANA via IDocs to exchange material master data and business partner data
- Customized, configured, and implemented inbound and outbound processing in the SAP S/4HANA environment for communication with the TIBCO EBX software interface
- Distributed classes, characteristics, and values between TIBCO BusinessWorks and SAP S/4HANA and customized the inbound processing
- Documented the technical components
Yannick T.
Last position:
Cloud Architect at Anonymous
- Implementation of Infrastructure as Code (IaC) with Terraform to ensure a scalable, repeatable, and secure Azure infrastructure
- Implementation and optimization of CI/CD pipelines with Azure DevOps
- Management of container and server environments and AKS
Discover over 15,000 top freelancers
Statistics of experts using CSS
Aggregated from the professional profiles of matched freelancers.
Experience
19 years (Germany: 17 years)
Position duration
3.4 years (Germany: 3.1 years)
Positions per freelancer
11
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Retail, Insurance
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
90% (Germany: 88%)
Master's degree or higher
61% (Germany: 51%)
Doctorate
3% (Germany: 6%)
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
98%
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 CSS
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.
CSS 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 (93%)
- Retail (43%)
- Insurance (37%)
- Professional Services (37%)
- Banking and Finance (33%)
- Transportation (30%)
- Automotive (28%)
- Media and Entertainment (26%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What CSS does
CSS, short for Cascading Style Sheets, controls how web pages and digital interfaces look and behave across screen sizes. It defines layout, spacing, typography, color, animation and responsive states while keeping presentation separate from HTML structure and application logic.
Where it is used
CSS is present in nearly every customer-facing web product, from marketing sites and online shops to dashboards, portals and design systems. Companies use it to deliver consistent experiences across browsers, phones, tablets and large displays.
- Responsive page layouts and component styling
- Accessible navigation, forms and interface states
- Design systems for products with many screens
- Performance-focused styling for content-heavy sites
Ecosystem and tooling
Modern CSS works alongside HTML, JavaScript and frontend frameworks such as React, Vue and Angular. Specialists may also use Sass, PostCSS, CSS Modules, Tailwind CSS or styled-components, together with browser developer tools, linters, formatters and visual regression testing.
When expertise helps
Freelance CSS expertise is useful when a product needs a reliable visual foundation, a complex interface must be made responsive, or an existing stylesheet has become difficult to change. Cologne companies can combine remote collaboration with on-site workshops when design, product and frontend teams need close alignment.
- Convert design files into precise, reusable interface components
- Refactor conflicting selectors and legacy styles
- Establish tokens for color, spacing and typography
- Resolve browser, viewport and interaction inconsistencies
What strong specialists deliver
Strong professionals understand the cascade, inheritance, specificity and modern layout systems such as Flexbox and Grid. They choose clear naming conventions, limit unnecessary overrides and account for keyboard access, reduced motion, loading behavior and long-term maintenance.
They also review the relationship between styles, markup and component architecture. Their work includes readable source files, documented decisions and visual checks that make future changes safer.
Choosing the right professional
Ask for examples that show responsive behavior, reusable components and careful handling of edge cases rather than screenshots alone. A useful discussion covers browser support, accessibility standards, design handoff, testing and how the specialist will work with existing frontend conventions.
For a Cologne-based or remote project, clarify workshop needs, communication language and overlap with the internal team. The right professional can improve both the visible interface and the structure behind it.
Frequently asked questions
Quick answers to the questions that come up most around CSS.
CSS controls the visual presentation of websites and applications. It handles layout, spacing, typography, colors, responsive behavior, transitions and states such as hover, focus and disabled controls.
CSS is the browser’s native styling language, while Sass adds authoring features such as variables, nesting and mixins before producing CSS. Tailwind CSS offers utility classes based on CSS properties; the best choice depends on the team’s design system, browser needs and maintenance preferences.
CSS work is strongest when paired with solid HTML, accessibility and responsive design knowledge. Familiarity with JavaScript, a frontend framework, Git, browser tools and design handoff software also helps a professional fit into an existing product team.
CSS experience should match the interface’s complexity, not a fixed time period. A landing page may need focused styling support, while a large product requires someone who can structure design tokens, manage component variants, improve legacy styles and support testing.
CSS projects are often well suited to remote collaboration because files, design references and visual reviews can be shared online. On-site sessions in Cologne can still be useful for design-system workshops, accessibility reviews or close work with product and design teams.
CSS quality is visible in consistent behavior across viewports, readable structure and sensible handling of focus, content length and browser differences. Ask a professional to explain their approach to specificity, accessibility, maintainability and visual testing rather than reviewing polished screenshots alone.
CSS support is valuable when visual inconsistencies slow releases, responsive issues affect customers or a design system needs to be introduced. An external professional can also bring an objective review of selectors, component boundaries, accessibility and performance.
CSS freelancers should clarify the existing frontend stack, browser support, design sources, accessibility expectations and review process. They should also ask who owns component decisions, how changes are tested and whether the work includes refactoring, new screens or both.
The average hourly rate of freelancers in Cologne, Germany who have used CSS in their recent projects is 93 €, which corresponds to a daily rate of about 741 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used CSS in their recent projects, 90% hold at least a Bachelor's degree, 61% hold at least a Master's degree, and 3% hold a doctorate.
On average, freelancers in Cologne, Germany who have used CSS in their recent projects have 19 years of professional experience, with a single engagement typically lasting around 3.4 years.
The most common languages among freelancers in Cologne, Germany who have used CSS in their recent projects are German (100%), English (98%), and French (22%).
The most common industries among freelancers in Cologne, Germany who have used CSS in their recent projects are Information Technology (93%), Retail (43%), and Insurance (37%).
The most common business areas among freelancers in Cologne, Germany who have used CSS in their recent projects are Information Technology (98%), Product Development (89%), and Project Management (48%).
Main locations of FRATCH Experts, who have recently used CSS
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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Nuremberg Request a free demo
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