RxJS Experts in Germany
matched in minutes with vetted freelancers and AIHire experts who build reactive streams, handle complex event flows, and clean up asynchronous JavaScript with RxJS, RxJS operators, and Observables. Get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Germany, who have recently used RxJS
Shamaila Mahmood
Last position:
MCP, Kubernetes, Helm, Docker, Terraform, Typescript, Java, SpringBoot, Go Lang, React at Kubekanvas
- Development of a browser-based platform for no-code deployment and cluster management in Kubernetes
- Implementation of a CLI tool in TypeScript to provision resources directly from the browser interface into the cluster
- Development of a expression parser in Go and delivery as a microservice to extract Helm expressions from values files
- Use of LLMs to turn user intent into Kubernetes diagrams
- Technology stack: Java, Go, OpenAI API, React, Azure, Next.js, Strapi, Stripe Connect
Sercan Tatar
Last position:
Co-Founder & Lead Software Architect at Pflege-Pfad
- Focus: system architecture, cloud-native platforms, microservices, API design
- Product: Pflege-Pfad is a digital matchmaking platform that connects relatives of people in need of care directly with verified care services and caregivers - without an agency and without ongoing fees.
- Business analysis & process design:
- Analysis of the German care market and identification of the key pain points of both target groups.
- Modeling of the core business processes: registration, verification, care request, application, placement, and rating.
- Definition of the business model as a freemium/premium model with optional contact unlocking.
- Creation of user stories and requirements documentation for relatives, care services, and administrators.
- Design of trust and quality assurance mechanisms with document upload, admin review process, and rating system.
- Coordination with stakeholders and validation of product decisions with potential users.
- Technical implementation:
- Design and implementation of the entire platform architecture as a solo developer.
- Design and implementation of a REST API with Spring Boot and Kotlin, including JWT-based authentication.
- Development of the frontend as a single-page application with Angular 17.
- Implementation of the AWS infrastructure with EC2, RDS PostgreSQL, S3, CloudFront, and IAM.
- Document upload with AWS S3 via presigned URLs for verification of care services.
- Email notifications via Resend API.
- AI-supported care service search via OpenAI API.
- Implementation of complete user flows such as registration, login, password reset, and placement process.
- Building an admin panel for user and care service management as well as analytics.
- CI/CD with GitHub Actions and containerized deployments with Docker.
- End-to-end tests with Playwright.
Technologies: Kotlin, Spring Boot 3, Spring Security, JWT, JPA/Hibernate, PostgreSQL, Angular 17, TypeScript, RxJS, AWS (EC2, ECS, S3, CloudFront CDN, RDS PostgreSQL, IAM), nginx, GitHub Actions, Playwright, Maven, Git, OpenAI API, Resend API, Docker, Scrum, i18n (DE/EN/TR), Kiro, feature-flag architecture.
Tamás Eppel
Last position:
Senior Software Developer / Tech Lead at NDA (defense / OSINT)
- Designing the audit logging framework
- Implementing APIs for developers to integrate in their codebase
- Implementing ingestion pipeline, database query layer and UI for browsing the audit events
- Improving stability and reliability of the backend system
Aruldass Arulanandu
Last position:
Web Module Lead at Mphasis Limited
- Led the end-to-end delivery of enterprise full-stack web applications by driving requirement analysis, solution design, frontend and backend development, database design, API integration, code reviews, team coordination, Agile execution, CI/CD deployments, production support, performance optimization, security implementation, and stakeholder collaboration to deliver scalable, high-quality software solutions.
Marc Smyk
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
Khaled Teilab
Last position:
Consultant / DevOps Engineer at Dr. Ing. h.c. F. Porsche Aktiengesellschaft
- Porsche ID is a unified digital identity platform providing secure authentication and seamless access across Porsche’s online services, mobile apps, and connected vehicle features
- Designed and implemented new authentication and authorization functionalities for both users and systems
- Ensured high availability, security, and performance to deliver a flawless digital experience for Porsche customers
- Technologies: Auth0, Angular, Tailwind, AWS, Terraform, Github
- Methodologies: Scrum and SAFe
Srinivasu Kakaraparti
Last position:
Atruvia
Project: Tax Exemption Order Application
The client has an existing application for creating and maintaining tax exemption orders for end customers; design and implementation of a comparable application for internal employees.
- Design and implementation of microservices and the UI for the business area "tax exemption orders" using Domain Driven Design as well as Spring Boot and Angular.
- Implementation of reactive, non-reactive, and asynchronous APIs (Spring REST, WebFlux, GraphQL).
- Development of the Angular application, including state management using Signals, RxJS Observables, and subscriptions.
- Securing the API and the application using OAuth2, JWT, and OpenID Connect.
- Configuration and setup of CI/CD pipelines with Jenkins.
- Collaboration with cross-functional teams and conducting code reviews.
Environment: Java, Spring Boot, Angular 18 & 19 (standalone, signals), RxJs, Bootstrap CSS, Vitesting, OpenShift, Istio, microservices, Kafka, Dynatrace, Jenkins, GitLab, Graylog, Sonar, Oauth2, OracleDB
Christof Hlipala
Last position:
Senior Frontend Developer at HUK24 AG
- Designing new apps as well as enhancing and running 29 Angular apps for digital claims in an Nx monorepo
- Maintaining and improving a shared component library with ~300 libraries for multiple product teams
- Migrating all apps to a new design system including its component library and systematic refactoring
- Developing and maintaining the CI/CD pipelines (Jenkins, Azure DevOps, Terraform, AWS)
- Managing releases independently including branch handling, versioning, PR coordination and production deployment
- Implementing and maintaining tracking (Adobe Analytics)
- Ensuring accessibility according to BFSG/WCAG
- Test-driven development (TDD) with Jest and Cypress
- Code reviews, mentoring and setting up best practices in the team
- Technologies: TypeScript, Angular 16-20, RxJS, NgRx, Nx (Monorepo), npm, HTML, (S)CSS, Storybook, Jest, Cypress, Cucumber, Husky, Node.js, Git, AWS, Azure DevOps (Repos & Pipelines), Jenkins, Terraform, TDD, BFSG, WCAG, Nexus, IntelliJ, Adobe Analytics
Nomaira Fariah
Last position:
Freelance Product Designer / Design Engineer at Independent
- Design and build client web apps and self-directed products end-to-end, covering product design, design systems, and full-stack front-end on React, TypeScript, Tailwind, and Supabase.
- Designed and shipped a compliance and staff-records web application for a UK transport operator, covering data modelling, UX, and front-end build on Supabase with row-level security and Edge Functions.
- Built Merita, a private-by-default achievement-tracking and performance-review app, in a 48-hour hackathon (SheBuilds). It covers win logging linked to goals and competency frameworks, AI-assembled review packets with token-gated sharing, and a Promotion Readiness view, and is built on React, TypeScript, Tailwind, shadcn/ui and Supabase with row-level security and Edge Functions.
- Designed and built Pantressa, a grocery-tracking, meal-planning and budgeting app, owning product design through front-end delivery on React, TypeScript, Tailwind and Supabase.
Alexander Schwartz
Last position:
Founder and Full-Stack Developer at TrumpPostAlert.com
- Feasibility study for quick implementation of requirements with AI-based development (vibe coding)
- Development of a single-page web app in Angular 20
- Development of a backend server application in Kotlin
- Integration with Google Cloud Platform (Firebase): authentication, Firestore NoSQL database, storage, Cloud Functions, hosting and Cloud Run
- Integration with a NEON PostgreSQL database
- Automated AI-based analysis of Donald Trump's posts on Truth Social and analysis of relevance for stock markets and geopolitical topics
- CI/CD via GitHub Actions using Docker and Google Cloud Run
- Technical environment: Angular 20 (Angular Material, RxJS), Kotlin 2.2.20, TypeScript 5.9.3, Spring Boot 3.5.6, Google Cloud Platform (Firebase, Cloud Run, Gemini, Vertex AI), ChatGPT Codex, Git, GitHub, SourceTree, IntelliJ WebStorm, IntelliJ IDEA
Ibrahim Hilali
Last position:
Senior Full Stack / AI Engineer at Punktum Digital GmbH
- Context: Healthcare and laboratory teams required faster document analysis, treatment-planning support, and reliable AI workflows for MR/VR-assisted operations.
- Contribution: Built the AI healthcare platform, model/agent workflows, VR-glasses deployment platform, REST APIs, Next.js/React interfaces, and CI/CD pipelines.
- Impact: Delivered a production-ready AI product foundation that improved clinical document review, supported laboratory automation, and made VR fleet deployment manageable across environments.
Tech: TypeScript, Next.js, Node.js, React, Java, Spring Boot, Python, PyTorch, TensorFlow, Docker, PostgreSQL, OpenAPI, GitLab, GitHub Actions.
Hicham Mokhtari
Last position:
Freelance Software Developer at Buhl Data Service GmbH
- Backend development: .Net 8, C#, PostgreSQL, Entity Framework Core, REST Web APIs, Docker, Kubernetes, Kafka, Open API Swagger, Apache Airflow, Resharper, Git, Microservices, SOAP, gRPC, Hangfire, OAuth 2, GraphQL
- Interface development for document processing with SmartFix, Softexpansion and Natif.ai: C#, REST API, Resharper, Git
- Deployment: Azure DevOps YAML, Vanilla Helmchart, Rancher, Kubernetes Cluster, Linux Docker, Windows VM, Python
- Unit tests and integration tests
- Telemetry, Kibana, Grafana, Elastic Search
- Work in a Kanban team of 8 developers, 1 tester and one Product Owner
David Dlouhy
Last position:
Senior Angular Engineer at HUK-Coburg
- Technologies: TypeScript, JavaScript, Java, HTML, SCSS, JSON, REST, Angular, Nx, NgRx, RxJs, Git, Spring, TFS, Jenkins, Jest, Cypress, UI/UX-Design, Figma, Storybook, Domain-Driven Design (DDD), Micro Frontend, Clean Code, Arc42, Agile, Scrum, Jira, Confluence
- Technical conception and further development of a modern Angular web application as part of the portal migration
- Built a modular frontend architecture with Nx and clear separation of domain and technical layers (Clean Architecture)
- Introduced and implemented Domain-Driven Design in the frontend context, including layer model and linting rules for code organization
- Developed reusable UI components and features using Angular, NgRx and RxJS
- Integrated the application with backend services via REST APIs
- Ensured high code quality through structured code reviews, testing with Jest and Cypress and introduction of guidelines
- Performed regular upgrades to new Angular versions to ensure long-term maintainability
- Collaborated closely with internal developers, product owners and stakeholders for requirements analysis and solution finding
- Supported the team through active knowledge transfer, review coaching and technical decision making
- Established a modular architecture with Nx & DDD as the technical foundation for future development
- Significantly improved test coverage through systematic introduction of Cypress and Jest tests
- Facilitated intensive collaboration with internal developers to build DDD structures and testing strategies
- Delivered a modernized UI focusing on clarity, usability and modern web technologies, achieving high acceptance by over 4,000 field staff
- Enabled parallel operation of the new Angular portal with the existing .NET system for phased migration of the sales process
Mathis Dudler
Last position:
Senior Web/Frontend Developer at KemCom GmbH
- Modernized the homepage of a luxury residential building for a better user experience and contemporary design
- Developed and implemented the website and modules using current web technologies
- Optimized for SEO to improve visibility in search engines
- Created a modern and professional appearance that enhances the building's image
- Increased efficiency in content maintenance by using a CMS
- Technologies: HTML5, HTML, CSS3, CSS, JavaScript, Umbraco, C#, .NET
Hüseyin Korkut
Last position:
Senior Full-Stack Engineer at DVAG
Architecture and implementation of a fully digitalized closing flow for managing securities contracts within the DVAG infrastructure. The platform aims for maximum user-friendliness, modular extensibility and compliant handling of sensitive data.
Implementation of a reactive UI structure with a focus on user guidance & accessibility.
Dynamic control of form and closing processes including validation logic.
Reactive state management via SignalStore (signals + selective effects).
UX optimization through adaptive components and Playwright-based UI tests.
Backend modularization to connect existing sales and contract logic.
API stability and DTO design according to Clean Architecture principles.
Collaboration with domain teams to define technical contracts and service boundaries.
Management with GitHub.
Unit tests with Jest, E2E tests with Playwright.
Code reviews, CI-integrated test execution, iterative refactorings.
Ensuring high coverage and UI stability in the closing flow.
Technologies: Angular 18, RxJS, SignalStore, HTML5, SCSS, Spring Boot, Kotlin, REST, OAuth2, Jest, Playwright, Clean Architecture.
Discover over 15,000 top freelancers
Statistics of experts using RxJS
Aggregated from the professional profiles of matched freelancers.
Experience
19 years
Position duration
1.7 years
Positions per freelancer
15
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Automotive
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
86%
Master's degree or higher
28%
Doctorate
8%
Certifications per freelancer
2
Most common languages
German, English, Spanish
Speak two or more languages
98%
Based on our profile pool as of 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Germany 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 Germany using RxJS
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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
Reactive JavaScript
RxJS, short for Reactive Extensions for JavaScript, is used to work with asynchronous data as streams. It helps teams combine events, timers, HTTP calls, and user input in a clear way. It is common in Angular apps and any JavaScript system with many moving parts.
Typical work
- Build event-driven front ends and live dashboards
- Shape API flows, polling, retries, and cancellations
- Coordinate form input, routing, and state updates
- Simplify complex async logic in web apps and services
Core ecosystem
Strong specialists know Observables, operators, Subjects, schedulers, and error handling. They also understand how RxJS fits with Angular, TypeScript, and browser APIs. Good work includes choosing the right operators and keeping streams readable.
When to bring help
Companies usually need outside expertise when stream logic has grown hard to follow, when Angular code needs refactoring, or when event handling becomes brittle. RxJS experts can also help with code reviews, migration work, and performance tuning. In Germany, this is often useful for product teams that need remote support with clear English communication.
What strong experts do
A solid RxJS professional writes small, predictable pipelines and avoids nested callbacks. They know when to use mergeMap, switchMap, concatMap, or exhaustMap, and they handle subscriptions without leaks. They also document stream behavior so the next expert can maintain it.
Deliverables and signs
- Cleaner async flows in front-end applications
- Stable event handling for complex user journeys
- Shared patterns for teams using ReactiveX ideas
- Migration support from callback-heavy JavaScript
Look for specialists who can explain trade-offs, not just syntax. Strong RxJS work is about control, clarity, and testable stream design.
Frequently asked questions
Everything clients usually want to know about RxJS, in one place.
RxJS is used to manage asynchronous events as streams. Teams rely on it for UI interactions, API calls, live updates, cancellations, and other flows where plain promise logic gets messy. It is especially common in Angular applications and other JavaScript projects with many events.
RxJS is better when you need continuous streams, composition, or cancellation across many events. Promises and async and await are simpler for one-time tasks, but they do not model ongoing event flow as well. A good specialist chooses the tool based on the shape of the problem, not habit.
No. RxJS is strongly associated with Angular, but it also appears in React, Node.js services, and plain TypeScript code. It is useful anywhere you need to coordinate events, polling, timers, or shared async logic.
A strong RxJS specialist usually knows TypeScript, modern JavaScript, and browser APIs. For front-end work, Angular knowledge helps a lot, especially around forms, routing, and change handling. Testing and clean code review habits matter too.
Simple stream work may need only a focused specialist, but complex pipelines, legacy refactors, or Angular migrations need someone with deep RxJS practice. The key is not years on paper but proof of clear operator choices and stable async design. Ask for examples that match your stack.
Yes, most RxJS work can be done remotely because it centers on code, reviews, and collaboration in shared repositories. For teams in Germany, clear written communication in English is often enough, and on-site time is usually only needed for workshops or tight product kickoffs.
Look for readable pipelines, correct operator use, and careful subscription handling in RxJS code. Strong specialists can explain why they used switchMap instead of mergeMap, or when a Subject is unnecessary. Good work is easy to test and easy to maintain.
Those names point to the same family as RxJS. Reactive Extensions for JavaScript is the full name, and ReactiveX is the broader concept across languages. If someone uses those terms, they are usually talking about the same stream-based approach.
The average hourly rate of freelancers in Germany who have used RxJS in their recent projects is 91 €, which corresponds to a daily rate of about 725 € based on an 8-hour working day.
Of the freelancers in Germany who have used RxJS in their recent projects, 86% hold at least a Bachelor's degree, 28% hold at least a Master's degree, and 8% hold a doctorate.
On average, freelancers in Germany who have used RxJS in their recent projects have 19 years of professional experience, with a single engagement typically lasting around 1.7 years.
The most common languages among freelancers in Germany who have used RxJS in their recent projects are German (97%), English (97%), and Spanish (9%).
The most common industries among freelancers in Germany who have used RxJS in their recent projects are Information Technology (98%), Banking and Finance (61%), and Automotive (52%).
The most common business areas among freelancers in Germany who have used RxJS in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (55%).
Main locations of FRATCH Experts, who have recently used RxJS
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 
Munich 
Frankfurt Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
