Kotlin Experts in Frankfurt
, matched in minutes with vetted and available freelancersHire experts who deliver Android applications, Kotlin/JVM backends and coroutine-based services, with practical knowledge of Spring, Ktor and multiplatform projects. FRATCH finds a precise match quickly among vetted, available freelancers.
Meet FRATCH Experts in Frankfurt, who have recently used Kotlin
Patrick L.
Last position:
Senior GenAI Fullstack Developer at SBH (Schulbau Hamburg)
Remote freelance role focused on Agentic AI strategy, secure application patterns, and reusable agentic workflows for a government agency.
- Development and implementation of an open-source Agentic AI strategy for a government agency, with a focus on GDPR, security, and self-hosted solutions
- Development of reusable agentic workflows and business applications that enable non-technical employees to solve business problems independently
- Implementation of nine business applications with Single Sign-On (SSO) and Azure PostgreSQL integration on Hetzner Linux servers
Techstack: Python, Streamlit, Anthropic SDK (Claude), Azure, Linux, PostgreSQL, MS SQL, Angular
Prasad T.
Last position:
Solution Architect / Senior Manager – DTC E-Commerce Platform at BRITA
- Led discovery phase and POC for Shopware to Shopify Plus migration across EMEA markets, evaluating platform suitability, technical architecture, and multi-brand/multi-country capabilities against business requirements.
- Designed reference architecture for Shopify Plus implementation incorporating headless front-end patterns (Vue.js, Nuxt.js), CMS integration (Magnolia), and Azure middleware (APIM, Functions, Logic Apps, Service Bus) for 11 EMEA markets.
- Defined migration strategy analyzing data mapping, cutover approach, and zero-downtime deployment patterns using Varnish caching, GitOps pipelines, and CI/CD orchestration across six vendor teams.
- Architected multi-tenant Shopify Plus governance model with centralized admin, localized storefront customization, and compliance controls (GDPR, data residency).
- Prototyped AI-driven search optimization (LLM.txt, JSON-LD) for product discoverability in Google AI results, demonstrating post-launch performance opportunities.
- Defined EMEA expansion roadmap for 15+ markets through C-level strategic workshops, identifying phased rollout, market-specific configurations, and resource requirements.
- Tech Stack: React, Nuxt.js, Vue.js, Magnolia CMS, Shopware, Shopify Plus, Azure (APIM, Functions, Logic Apps, Service Bus, Front Door), Varnish, SAP, MS Dynamics, Docker, Kubernetes, GitHub Actions, PostgreSQL, Kafka
Michael H.
Last position:
Frontend Developer at RTL Tech
- Development and optimization of the RTL+ frontend application for SmartTV and set-top box platforms with React and Next.js.
- Key role in the technical coordination of developers within the team and in coordinating implementation.
- Central interface to adjacent teams to simplify development processes and improve cross-team alignment.
- Improved frontend performance, stability, and rendering behavior on low-powered devices in a restricted runtime environment.
- Implemented a frontend testing strategy with Jest, React Testing Library, and Playwright.
- Implemented accessibility improvements according to WCAG 2.2 and WAI-ARIA.
- Integrated Didomi Consent Management as a contribution to increasing ad monetization on streaming platforms.
- Used AI-supported engineering workflows with Cursor for structured implementation, refactoring, and faster problem solving.
Technologies used: React, Next.js, TypeScript, JavaScript, GraphQL, Apollo Gateway, Zustand, Tailwind CSS, Styled Components, React Testing Library, Playwright, Jest, HTML5, CSS3, AWS Lambda, EC2, CloudFront, S3, GitLab CI/CD, NX, Cursor
Jan M.
Last position:
Founder, Senior Solution Architect, Team Lead, Senior DevOps Engineer at CreArt IT GmbH
- Hands-on solution architect
- Digital product development - SaaS
- Strategic consulting on software architecture, cloud migration, and DevOps processes
- Coaching SE developers and IT architects
Florian F.
Last position:
Senior Backend Developer at ING Deutschland AG
- Database design with Oracle DB, JPA and Flyway considering high performance requirements
- Analysis of multiple architecture drafts and identification of technical risks
- Design and implementation of various interfaces and integrations, especially REST APIs and Kafka topics
- Setup of Elasticsearch for monitoring and analyzing log data
- Establishment of an iterative work approach in the project team facing complex business requirements
Werner K.
Last position:
Test Coordinator, Designer and Engineer at IBM
- Testing the SekIDP and related components
- Test design, execution and automation, microservices, GitHub Enterprise, Eclipse, Katalon Test Platform, API Testing, Confluence 8, JIRA/Xray, Draw.io, Swagger/OpenAPI, Postman, Docker, Kubernetes, Podman, PuTTY, E-Health, Telematik, Gematik standards, EPA, E-Rezept, sektoraler IDP, encryption, XaDES, PaDES, DICOM, HL7, FHIR, IHE, ICD, SSO, SAML/Shibboleth, OAuth, smartcards, JWT, two factor authentication Android and iOS, Wireshark, BrowserStack, Cypress, gRPC, REST, SOAP, WS-Security, Linux Shell, PowerShell, SSH/SSL, Java, Kotlin, Cordova, Gradle, Groovy, Python, TypeScript
Umer D.
Last position:
Activation and Vocational Integration Program with Integrated Language Support at Berlitz
- Intensive language course with a focus on professional language content.
Artur S.
Last position:
Senior Consultant at MHP - A Porsche Company
Design, development, and consulting of software solutions in international, cross-functional agile projects (SAFe / Scrum), focusing on financial services and UX development.
Service Unit: Customer Experience Digital Solutions
Muhammad A.
Last position:
Sr. Software Engineer at Hoja AI
- Built scalable Flutter apps (mobile & web) using BLOC and Clean Architecture, improving app performance and maintainability.
- Delivered advanced AI & agentic AI features with real-time communication and personalized user flows.
- Developed backend services in Ktor (Kotlin) and ensured quality via testing, CI/CD, code reviews, and Scrum practices.
Mohammad A.
Last position:
ParkProReakt at Justus Liebig University Giessen
- proactive instead of reactive symptom detection in Parkinson patients
- iOS development
- FHIR integration
- database structure
Discover over 15,000 top freelancers
Statistics of experts using Kotlin
Aggregated from the professional profiles of matched freelancers.
Experience
13 years (Germany: 17 years)
Position duration
2.2 years (Germany: 2.7 years)
Positions per freelancer
10 (Germany: 12)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Media and Entertainment, Professional Services
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
90% (Germany: 93%)
Master's degree or higher
30% (Germany: 55%)
Doctorate
10% (Germany: 9%)
Certifications per freelancer
3 (Germany: 2)
Most common languages
German, English, Urdu
Speak two or more languages
90% (Germany: 98%)
Based on our profile pool as of 29 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Frankfurt are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging within that range.
Average rates of experts in Frankfurt using Kotlin
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 29 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Kotlin 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%)
- Media and Entertainment (60%)
- Professional Services (60%)
- Education (40%)
- Banking and Finance (40%)
- Healthcare (40%)
- Insurance (40%)
- Automotive (30%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Kotlin at a glance
Kotlin is a statically typed language from JetBrains for the JVM, Android, web and native applications. It combines concise syntax with null-safety, extension functions and strong Java interoperability. Teams use it for mobile products, backend services, shared business logic and tooling.
What Kotlin builds
Kotlin supports product work across mobile, server and multiplatform environments.
- Native Android applications with Jetpack Compose
- REST and event-driven services on the JVM
- Backend systems with Spring Boot or Ktor
- Shared code for Android, iOS and other targets
- Internal tools, SDKs and automation utilities
Ecosystem and tooling
The Kotlin ecosystem includes Kotlin/JVM, Kotlin Multiplatform and Kotlin/Native. Specialists commonly work with Gradle, IntelliJ IDEA, Android Studio, Kotlin Coroutines, Flow and serialization libraries. They may also use Java, Spring, Ktor, Compose, SQL databases, Docker and cloud delivery pipelines.
When companies need specialists
Freelance expertise helps when an Android product needs a safer foundation, a Java service is being modernised, or a team wants to share domain logic across platforms. It is also useful for short delivery phases, architecture reviews, migration work and testing improvements.
- Moving Java code towards Kotlin without disrupting releases
- Introducing coroutines and structured concurrency responsibly
- Establishing Compose, testing and code-quality practices
- Preparing Kotlin Multiplatform modules for production
What strong professionals bring
Strong Kotlin professionals understand language features in context rather than using them for style alone. They design clear APIs, handle nullability deliberately and make concurrency observable and testable. They also know where Java interoperability creates friction and how Gradle configuration affects build speed and reliability.
Look for a specialist who can explain trade-offs, review existing code and connect implementation choices to product needs. Experience with deployment, monitoring, security and team conventions matters as much as elegant syntax.
Kotlin in Frankfurt teams
Companies in Frankfurt use Kotlin across financial services, mobility, commerce and enterprise software. Local teams may need specialists who can work on-site for workshops while continuing remotely for delivery. Clear communication in English is common, while German can support stakeholder work and collaboration in local organisations.
Frequently asked questions
Everything clients usually want to know about Kotlin, in one place.
Kotlin is widely used for Android applications, JVM backend services, APIs and shared code in multiplatform products. It also supports native applications, internal tools and libraries that need close integration with Java systems.
A strong Kotlin freelancer can reduce boilerplate through concise syntax, null-safety and data classes while keeping access to the Java ecosystem. Java may remain a practical choice for teams with established conventions, but Kotlin often improves readability without requiring a separate runtime.
A capable Kotlin specialist often brings Android or JVM knowledge, Gradle, automated testing and database integration. Depending on the project, useful adjacent skills include Spring Boot, Ktor, Jetpack Compose, Docker, cloud deployment and observability.
The right Kotlin professional depends on the work, not on a label alone. A focused feature may need strong language and testing skills, while a migration or multiplatform architecture requires experience with Java interoperability, build systems, release processes and long-term maintenance.
Kotlin work is well suited to remote collaboration because code review, testing and delivery run through shared repositories and pipelines. Frankfurt teams may still prefer on-site workshops for discovery or architecture, followed by remote implementation with agreed communication routines.
Review how a Kotlin professional handles nullability, coroutine cancellation, error boundaries and API design. A quality assessment should also cover tests, build configuration, Java interoperability and whether the code remains understandable for the wider team.
Kotlin Multiplatform can fit products that want to share domain logic, networking or validation across Android, iOS and other targets. It is not automatically the best choice for every interface, so the specialist should define the shared boundary and account for platform-specific user experience.
A Kotlin professional should clarify the target platforms, existing Java or Android code, build tooling, release ownership and testing expectations. Asking how the team uses coroutines, code review and architectural boundaries reveals the project’s real working style before delivery begins.
The average hourly rate of freelancers in Frankfurt, Germany who have used Kotlin in their recent projects is 90 €, which corresponds to a daily rate of about 723 € based on an 8-hour working day.
Of the freelancers in Frankfurt, Germany who have used Kotlin in their recent projects, 90% hold at least a Bachelor's degree, 30% hold at least a Master's degree, and 10% hold a doctorate.
On average, freelancers in Frankfurt, Germany who have used Kotlin in their recent projects have 13 years of professional experience, with a single engagement typically lasting around 2.2 years.
The most common languages among freelancers in Frankfurt, Germany who have used Kotlin in their recent projects are German (100%), English (80%), and Urdu (20%).
The most common industries among freelancers in Frankfurt, Germany who have used Kotlin in their recent projects are Information Technology (100%), Media and Entertainment (60%), and Professional Services (60%).
The most common business areas among freelancers in Frankfurt, Germany who have used Kotlin in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (70%).
Main locations of FRATCH Experts, who have recently used Kotlin
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 
Stuttgart 
Dusseldorf 
Dortmund Countries:
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