RxJS Experts in Germany
matched in minutes by AIHire experts who design reactive data flows, connect Angular interfaces to live services, and manage complex asynchronous behavior with RxJS. Get precise access to vetted, available freelancers for remote or on-site work in Germany.
Meet FRATCH Experts in Germany, who have recently used RxJS
Sercan T.
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 E.
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
Kersten L.
Last position:
Lead Architect / Lead Developer at Bettles: Sports Betting Platform
- Complete greenfield rebuild across the whole stack — built AI-native: backend in Go and NestJS, PostgreSQL (CNPG) on K3s with GitOps/Terraform; frontend on Angular 22, zoneless.
- Orchestrated coding agents (e.g. Claude Code, Cursor) across the entire lifecycle — architecture, implementation, testing, reviews, documentation — driven by Specification-Driven Development (SDD).
- “Bruno” — LLM commentator persona backed by RAG and MCP for a personality that stays consistent across all generations (match previews, post-match reports, his own virtual bets).
Angular 22 (zoneless, without Zone.js), Claude Code, Claude Code Skills, CNPG, Cursor, Design Tokens (Spec for Code), Docker, Gherkin, Git, GitLab, GitOps, Go, Google Gemini, Grafana, Hetzner Cloud, K3s, Keycloak, Kubernetes, Lighthouse, LLM Integration, Model Context Protocol (MCP), NestJS, Node.js, NPM, Playwright, PostgreSQL, Prometheus, RAG, REST, Specification-Driven Development (SDD), Structured Outputs, Terraform, TypeScript, Vitest
Aruldass A.
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 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
Srinivasu K.
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 H.
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
Aweem A.
Last position:
Senior Java Developer at Folio3
- Architected, developed, and maintained scalable backend services using modern Java (17/21), Kotlin, and Spring Boot for high-traffic, performance-critical platforms.
- Served as a technical leader for complex initiatives, taking features from inception through deployment, and implementing runtime validation layers using advanced LLM APIs with secure guardrails.
- Optimized PostgreSQL schemas and query efficiency at scale, drastically reducing data retrieval latencies and ensuring cross-service transactional consistency.
- Spearheaded continuous improvement in development processes, designing comprehensive unit and integration testing frameworks that drove test coverage from 50% to over 90% via JUnit, Spock, and Mockito.
- Partnered extensively with cross-functional product and data squads to define API boundaries, design interfaces, and ensure rapid, high-confidence CI/CD release cycles.
Volker A.
Last position:
Senior Frontend Angular Developer at fintus GmbH
- Senior Frontend Angular and Frontend
- Integrating Camunda processes into the frontend
- Development supported by ChatGPT (Codex) and Claude (skills etc.)
Knowledge: Angular, Camunda
Products used: Claude, Codex, ChatGPT, Camunda
Nomaira F.
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.
Shweta S.
Last position:
Java Developer (Working Student to Intern) at Nord LB
- Took ownership of the full development lifecycle for various features, from design through coding, debugging, and production deployment, ensuring compliance with banking-grade reliability standards.
- Optimized SQL queries, reducing data-processing time by up to 50%, especially for large datasets handled.
- Developed and maintained automated tests using JUnit and Mockito.
- Utilized GitHub Copilot as an AI-assisted development tool to accelerate code generation, improve code quality, and increase development efficiency within the team.
- Resolved 90% of assigned production issues independently, often under tight deadlines, contributing to uninterrupted system availability.
Thilo K.
Last position:
Senior Frontend Web Developer at Zeppelin GmbH
Selection and evaluation of different frontend frameworks for a headless CMS
Consulting the UI/UX team on the design system
Technologies:
Figma
Design Token
Tailwind
Storybook
React
NextJs
Strapi
AJAX
Confluence
CSS3
Docker
Eslint
Git
GraphQL
HTML5
IntelliJ/WebStorm
JAM Stack
Jasmine
Jenkins
Jira
JSON
JSX
Mocha
Native JavaScript (ES6)
NodeJS
Prettier
REST
REST APIs
SCSS
SSR
StyleGuides
SVG
TypeScript
Webpack
Ibrahim H.
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.
Khaled T.
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
Hicham M.
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
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
87%
Master's degree or higher
27%
Doctorate
8%
Certifications per freelancer
2
Most common languages
German, English, Spanish
Speak two or more languages
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 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.
Discover detailed RxJS rate benchmarks:
Explore rate insightsAverage 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 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
RxJS 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 (99%)
- Banking and Finance (59%)
- Automotive (51%)
- Manufacturing (50%)
- Retail (49%)
- Healthcare (43%)
- Insurance (41%)
- Government and Administration (41%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Reactive programming with RxJS
RxJS is a JavaScript and TypeScript library for reactive programming. It represents changing values and asynchronous events as Observables, then processes them through composable operators. Teams use it to coordinate user input, network requests, WebSocket messages, timers and other event streams without scattering state logic across an application.
Applications and workflows
RxJS is common in front-end products where data changes continuously or several asynchronous actions depend on one another. Typical use cases include:
- Managing search suggestions, filters and form validation
- Combining API responses for dashboards and business screens
- Handling live notifications, chat and event feeds
- Coordinating retries, cancellation and loading states
It also supports reactive services and event-driven workflows beyond the browser.
Ecosystem and tooling
RxJS works closely with TypeScript and is a central part of Angular application development. Strong specialists understand operators such as map, switchMap, mergeMap, concatMap, catchError and shareReplay, along with subjects, schedulers and subscription lifecycles. They may also work with NgRx, Redux-style state patterns, React integrations, Node.js services, WebSockets and browser APIs.
When companies need help
Freelance expertise is useful when streams have become difficult to trace, subscriptions leak resources or asynchronous rules are producing inconsistent screens. Companies also bring in specialists during Angular migrations, state-management redesigns, performance work and the delivery of real-time features. In Germany, remote collaboration is common, while some teams need on-site workshops or German-language communication.
Delivery and testing
A capable RxJS professional models data flow before selecting operators. They define clear stream boundaries, keep side effects explicit and choose cancellation or concurrency behavior that matches the business rule. They test emitted values, timing, errors and teardown behavior with marble tests or focused unit tests, while using browser tools and TypeScript checks to investigate runtime issues.
What strong specialists bring
The best results come from more than memorizing operators. Strong specialists can explain why a stream exists, simplify nested or duplicated pipelines and protect components from unnecessary work. They understand accessibility, API contracts, error recovery, caching and observability, and they document patterns so the internal team can safely extend the code after handover.
Frequently asked questions
Everything clients usually want to know about RxJS, in one place.
RxJS is used to represent and transform asynchronous data as Observable streams. Companies apply it to search, forms, live dashboards, notifications, WebSocket features, API orchestration and complex user interactions.
RxJS supports ongoing streams, cancellation, composition and multiple values over time, while promises usually represent one eventual result. A freelancer should choose the simpler approach when a workflow is one-off, and use Observable streams when timing, events or coordination are central.
A strong RxJS specialist usually works confidently with TypeScript, JavaScript, Angular, browser APIs and HTTP clients. Depending on the project, useful adjacent skills include NgRx, React integrations, Node.js, WebSockets, testing and performance analysis.
The required RxJS experience depends on the complexity of the streams, not only on the size of the application. Straightforward API and form flows need solid fundamentals, while real-time features, shared state, cancellation rules and difficult timing behavior call for deeper specialist expertise.
RxJS work is well suited to remote collaboration because code review, tests and stream diagrams make the decisions visible. Teams in Germany should agree on working language, time-zone overlap, repository access and workshop expectations before the engagement begins.
RxJS may add unnecessary abstraction when an application only handles isolated asynchronous results and has little event coordination. A careful specialist will compare it with promises, async and await, framework state tools or a simpler event approach instead of introducing streams by default.
Look for RxJS code with readable pipelines, deliberate operator choices, explicit error handling and reliable teardown. Ask the specialist to explain cancellation, concurrency, subscription ownership and tests for timing-sensitive behavior, then review whether the design remains understandable to the team.
Before taking on RxJS work, clarify the framework version, data sources, stream ownership, state-management approach and expected real-time behavior. Also ask about existing tests, performance symptoms, deployment constraints and whether the engagement includes documentation or knowledge transfer.
The average hourly rate of freelancers in Germany who have used RxJS in their recent projects is 90 €, which corresponds to a daily rate of about 724 € based on an 8-hour working day.
Of the freelancers in Germany who have used RxJS in their recent projects, 87% hold at least a Bachelor's degree, 27% 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 (99%), Banking and Finance (59%), and Automotive (51%).
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 (54%).
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 
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