YAML Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used YAML
Alexander B.
Last position:
Senior Data Engineer at RWE AG
Architected and maintained data products for renewable energy operations, covering wind turbine, grid-meter, and weather data. Built scalable ETL/ELT pipelines in Azure Databricks using Delta Lake (bronze/silver/gold layers) and processed data in various formats, including structured and semi-structured data. Contributed to a data quality framework supporting table and column documentation, outlier detection, and completeness metrics across all datasets within a data product. In addition, implemented a DORA KPI Databricks dashboard used across all data products. Optimized CI/CD processes in Azure DevOps to streamline deployment across development, test, and production environments.
Technology stack: Azure Databricks, PySpark, SQL, Delta Lake, Unity Catalog, Azure Data Lake, APIs, Dremio, Azure DevOps, YAML, Git, Databricks Workflows, Application Insights, Terraform, OpenAI API, Codex, LLM-assisted workflows
Halil O.
Last position:
Senior Cloud Operations & DevSecOps Engineer (Azure / Terraform / CI-CD) at KfW Bankengruppe
Regulated environment within a German banking group (approx. 8,500 employees, hybrid cloud strategy).
Responsible for operating, provisioning, and continuously securing business-critical platforms – including a GenAI chat application, a big data/AI platform, and data science workspaces based on Azure Virtual Desktops and VMs. Ownership of Azure DevOps projects for ShaiHulud and React2Shell, as well as BSI alerts – Security Operations improvements across the SDLC.
Deployment responsibility for the GenAI chat application, big data/AI platform (BDAI), and data science workspaces (AVD/VM-based) in the respective landing zones.
Deployment & release management: end-to-end responsibility for deploying portal and service applications across multiple Azure landing zones, including technical approvals, compliance with development team deployment guidelines, and ensuring ITIL-based change and release processes via ServiceNow.
Azure landing zones & network architecture: design, provisioning, and operation of Azure landing zones for 3-tier web applications with enhanced network segmentation, VNet peering, hub-and-spoke architectures, private endpoints, and firewall integration across separate subscriptions and tenants.
Azure DevOps governance & operations: ownership of the Azure DevOps organization, including projects, repositories, and CI/CD pipelines; implementation of governance requirements such as branch policies, approval gates, permission models, and audit-ready operating structures.
Infrastructure as Code (Terraform): design, implementation, and operation of a modular Terraform architecture for standardized cloud infrastructure deployment, including state management, provider versioning, reusability, and policy-as-code approaches.
CI/CD pipeline engineering: design, operation, and optimization of complex YAML-based CI/CD pipelines with multi-stage deployments, template standardization, self-hosted agents, integrated secret management, and automated quality and security checks.
Git migration & platform consolidation: planning and execution of repository and pipeline migration from Azure DevOps to GitLab CI/CD, including automated scripts, full Git history transfer, pipeline porting, and platform consolidation.
Container & platform operations (AKS): operation and security assessment of containerized workloads on Azure Kubernetes Service, centralization of on-premises container registries for ACR.
OpenShift (OCP) security reviews: security assessment of code baselines, build pipelines, and deployment processes for on-premises OpenShift clusters with critical applications, and derivation of specific hardening recommendations.
Shift-left security & DevSecOps transformation: introduction of a company-wide shift-left approach for early security integration in development and deployment processes, enabling developers to perform self-led security checks and sustainably reduce vulnerabilities before production (IDE integrations, pre-commit hooks, local scanners).
Software supply chain security: analysis and mitigation of supply chain risks in NPM- and Yarn-based applications through dependency audits, CI/CD pipeline hardening, token rotation, and restriction of risky build and lifecycle mechanisms.
Frontend & framework security (React / Next.js): security assessment and coordination of critical vulnerability remediation across platform applications and web frameworks, including coordination and complementary technical mitigations with all teams following BSI alerts.
Software composition analysis (SCA): introduction and operation of automated vulnerability scans for container images, pipelines/artifacts, and third-party dependencies, including SBOM exports within CI/CD pipelines.
SAST/DAST integration: design and piloting of static and dynamic application security tests in close collaboration with security architecture and development teams, for continuous improvement of code and runtime security, and establishing operational acceptance tests.
Artifact & registry consolidation: analysis and consolidation of all package and container repositories for service applications and AKS workloads, aiming for a centralized, secured registry strategy with centralized vulnerability scanning and governance.
Dependency-Track & SBOM strategy: advising the compliance board on introducing a central SBOM and vulnerability management platform to increase enterprise-wide dependency transparency and accelerate CVE response capability.
CI/CD pipeline hardening: security analysis and cleanup of the existing pipeline landscape by removing unused pipelines, improving secrets hygiene, implementing least-privilege principles, and isolating build agent environments.
Azure Web Application Firewall (WAF) optimization: analysis and tuning of existing Azure WAF rules (OWASP Top 10 Core Rule Set, DSR/SDC, custom rules) to defend against known vulnerabilities and exploit patterns, including reducing false positives and improving threat detection.
Documentation & stakeholder communication: creating and maintaining technical documentation, runbooks, and architecture overviews in Jira and Confluence, as well as active knowledge transfer between operations, development, security, and compliance stakeholders.
Alexander R.
Last position:
Business Analyst at Financial Services Provider Landesbank
The Helaba ATLAS project aims to modernize core systems and make them future-proof. As part of the subproject, the existing legacy system for international payments is being replaced by a modern web-based application.
- Analysis of functional and technical requirements
- Analysis and optimization of business processes
- Process modeling
- Preparation and facilitation of workshops
- Defining project scope and prioritizing requirements
- Business process management (analysis, modeling, and optimization)
- Specification of user stories
- Designing business and authorization concepts
- Testing and acceptance
- Designing mockups in Figma
- Creating the UI/UX style guide for web applications Approach: Scrum (agile) Technologies: Jira, Confluence, MS Teams, Conceptboard, Java, Vaadin, Figma
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
Jens H.
Last position:
#52 Test Manager in Safety-Critical Infrastructure at Telecommunications Company
- Network elements, network, operational and operator-related systems
- Supporting around 20 different products (managed agile)
- Requirements analysis and management (functional and non-functional)
- Test concept and planning (scope, test phases, effort, schedule, resources, organization, etc.)
- Aligning approach with clients and service providers
- Managing and assisting in creation of test cases for system, integration and end-to-end tests
- Guiding and supporting test execution
- Defect management and planning bug fixes with external providers
- Preparing and facilitating workshops
- Regular reporting and creating automated test reports
- Further development of agile testing methodology and configuration of supporting tools
- Conceptual support in developing a quality seal for rating product and service quality of internal and external providers
- Requirements engineering based on ISO/IEC 25010, Scrum, SaFE
- BMC Remedy, Atlassian Confluence, Atlassian Jira (including plugins Xray, Structure), Microsoft Office (incl. Visio), Obsidian, doxis document management system, Gitlab, Obsidian
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
Discover over 15,000 top freelancers
Statistics of experts using YAML
Aggregated from the professional profiles of matched freelancers.
Experience
18 years
Position duration
1 year (Germany: 1.9 years)
Positions per freelancer
17 (Germany: 13)
Top business areas
Information Technology, Product Development, Operations
Top industries
Information Technology, Professional Services, Automotive
Certification focus areas
Information Technology, Business Intelligence, Operations
Bachelor's degree or higher
80% (Germany: 95%)
Master's degree or higher
60% (Germany: 64%)
Certifications per freelancer
8 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 99%)
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 YAML
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.
YAML 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%)
- Professional Services (83%)
- Automotive (67%)
- Banking and Finance (67%)
- Government and Administration (67%)
- Aerospace and Defense (50%)
- Insurance (50%)
- Transportation (50%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Configuration files
YAML is a human-readable way to define structured data. Teams use it for app settings, deployment manifests, service definitions, and automation files. It is common in software delivery because it is easy to review, diff, and keep in version control.
Where it appears
- Kubernetes manifests and Helm values
- CI/CD pipelines in GitHub Actions, GitLab CI, and similar tools
- Ansible inventories, playbooks, and role variables
- Cloud and infrastructure templates
- API specs, test fixtures, and environment settings
Skills that matter
Strong YAML specialists know indentation rules, anchors, aliases, multi-line strings, and schema-aware validation. They also understand how YAML behaves inside tools such as Kubernetes, Docker Compose, and Ansible, where small syntax mistakes can break a pipeline or a rollout.
When companies bring help
Companies usually bring in freelance expertise when config sprawl, fragile deployments, or unreadable files slow teams down. A specialist can clean up legacy files, standardize conventions, and make settings safer to edit. In Cologne, this is especially useful when local product teams work with distributed infrastructure or remote release workflows.
Good delivery looks like
A strong professional writes clear, consistent YAML and tests it against the system that consumes it. They avoid hidden whitespace problems, use reusable patterns where they help, and keep files simple enough for other experts to maintain. They also spot when YAML is the wrong place for logic and move complexity elsewhere.
Ecosystem and tooling
YAML often sits between source code and runtime infrastructure. It is used with linters, schema validators, editor support, secret managers, and deployment tools, so the work is rarely just editing text. In practice, the best results come from someone who can trace a file from authoring to execution and explain how each field is interpreted.
Frequently asked questions
The facts hiring teams ask for most often when it comes to YAML.
YAML is used to describe structured configuration in a format people can read and review easily. Teams rely on it for Kubernetes manifests, CI/CD pipelines, Ansible playbooks, Docker Compose files, and application settings. It is especially useful when the file needs to live in Git and be edited often.
YAML is the standard name, and YML is just a common file extension shorthand you will also see in repositories. The full phrase “YAML Ain’t Markup Language” is the original backronym, but most professionals simply say YAML. When hiring, search for both YAML and YML because teams use both terms in practice.
YAML is usually chosen when readability and manual editing matter more than strict minimalism. Compared with JSON, it is less noisy and better suited to layered config files, but it is also more sensitive to whitespace and indentation. Compared with TOML, it is more widely used in infrastructure and orchestration tooling.
A strong YAML freelancer usually knows the tool that consumes the file, not just the syntax. For infrastructure work, that often means Kubernetes, Helm, Ansible, Docker Compose, CI/CD systems, and schema validation. Basic Git skills and a careful eye for formatting are also important.
YAML tasks can look simple, but production files often touch deployment, security, and automation. For a small cleanup or new config file, a specialist with solid practical experience is often enough. For complex platform work, look for someone who has already handled the surrounding tooling and release flow.
YAML work is usually remote-friendly because most tasks happen in repositories, review tools, and shared docs. On-site time in Cologne can still help when teams need to align on naming, environment structure, or release flow with local stakeholders. Many projects work best with a remote specialist and short in-person alignment sessions.
A good YAML professional produces files that are easy to read, valid for the target tool, and consistent across the project. They should explain why a field exists, where values come from, and how the file is checked before release. Ask for examples that show real deployment or automation work, not just clean formatting.
YAML problems often come from indentation errors, duplicate keys, unclear anchors, and mixing too much logic into one file. Another common issue is writing files that look correct to a person but fail when the target tool parses them. A good specialist reduces that risk with validation, simple structure, and clear conventions.
The average hourly rate of freelancers in Cologne, Germany who have used YAML in their recent projects is 116 €, which corresponds to a daily rate of about 931 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used YAML in their recent projects, 80% hold at least a Bachelor's degree and 60% hold at least a Master's degree.
On average, freelancers in Cologne, Germany who have used YAML in their recent projects have 18 years of professional experience, with a single engagement typically lasting around 1 year.
The most common languages among freelancers in Cologne, Germany who have used YAML in their recent projects are German (100%), English (100%), and French (33%).
The most common industries among freelancers in Cologne, Germany who have used YAML in their recent projects are Information Technology (100%), Professional Services (83%), and Automotive (67%).
The most common business areas among freelancers in Cologne, Germany who have used YAML in their recent projects are Information Technology (100%), Product Development (100%), and Operations (83%).
Main locations of FRATCH Experts, who have recently used YAML
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
