RxJS Expert in Munich
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Meet FRATCH Experts in Munich, who have recently used RxJS
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
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
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
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
Boris Nicolai
Last position:
Fullstack Developer & DevOps Engineer at EnBW Energie Baden-Württemberg
- Further development of the internal "ECockpit" platform with an Angular 17 frontend and .NET (C#) backend
- Maintenance and further development of Azure DevOps pipelines
- Introduction of technical improvements in build & release processes
- Collaboration on a modular architecture approach (Clean Architecture & DDD)
- Focus on scalability and secure data processing
- Tech stack: Angular 17, .NET / C#, Azure, Azure DevOps, Git, CI/CD, Clean Architecture, Domain Driven Design
Daniel Redwig
Last position:
Software Engineer at DB InfraGO AG
- Developed dynamic web components for displaying KPIs, intelligent map applications, and operational process analysis tools
- Angular 18+
- Leaflet, MapLibre
- NestJS, JavaScript, HTML, CSS
- PostgreSQL, GraphQL, RabbitMQ
- Gitea, Jenkins, Docker
Bela Bocsak
Last position:
Full Stack Lead Developer, Backend Architect at Telefonica (O2)
The software supports the complete planning and approval of antennas for mobile telephony.
The system was implemented using an event-driven microservice architecture for cloud-native deployment with Quarkus on the backend, Kafka for communication, and Angular for the frontend. Services run on Kubernetes in Google Cloud. A special challenge was synchronizing with the legacy system still used by some users.
Igor Caviroski
Last position:
Senior Frontend Developer at Freelance Frontend Developer
- Senior Frontend Developer, January 2022 – July 2024: Industry: banking and Deutsche Bahn, large databases; Technology: Angular 18, AngularJS, TypeScript, JavaScript, RxJS, CSS, HTML, Azure, Docker, Git; Company size: 50–55 people
- Senior Frontend Developer, October 2021 – December 2021: Industry: contract management; Technology: Angular 12, Syncfusion, TypeScript, RxJS, CSS, HTML, Docker, Git; Company size: 15–20 people
- Senior Frontend Developer, May 2021 – September 2021: Industry: web, social network; Technology: JavaScript, jQuery, Django, CSS, HTML, Git, Compass; Company size: 15–20 people
- Senior Frontend Developer, January 2021 – April 2021: Industry: web, web applications; Technology: Angular 8, TypeScript, RxJS, Docker, Git, CSS, HTML; Company size: 1–10 people
- Senior Frontend Developer, June 2020 – December 2020: Industry: web, web applications; Technology: JavaScript, Dart, Flutter, Git, CSS, HTML; Company size: 1–10 people
Andreas Kraus
Last position:
Senior Developer at ioki GmbH, a Deutsche Bahn AG company
- Fullstack development based on Next.js and TypeScript
- Development and optimization of geospatial database queries for PostgreSQL/PostGIS
- Visualization of geospatial data using Mapbox
- Design and execution of load tests and performance optimizations
- Code reviews and documentation tasks
- Technologies: JavaScript, TypeScript, Next.js, React, Zod, tRPC, Storybooks, PostgreSQL/PostGIS, MicroORM, Knex, Material UI, Mapbox, BullMQ, Jest, Playwright, Artillery.io, K6, Sentry, Figma, GitLab, Grafana, GTFS
René Wick
Last position:
Development of an AI-supported system for lead generation
As part of an in-house development project, a pipeline for automated lead generation was created as the second stage of a preceding system for project monitoring. Based on a list of freelance project URLs (freelancermap), qualified lead records are generated, including company, contact person, official and personal email address, and the appropriate form of address (informal/formal). The technologies used were Python (openpyxl, requests) as well as an LLM agent workflow in VS Code (GitHub Copilot Chat) with a custom slash command and extensive rule set; search APIs (Serper.dev) are connected for research. My tasks included the full concept and development. The core is a rule set of around 480 lines that guides the LLM agent deterministically through extraction, website and email lookup, duplicate matching (against existing provider lists), and the creation of a structured JSON output. Deterministic steps (Excel matching, web/email search, pattern derivation) were moved into Python helper scripts. Other requirements included validating the results through versioned blind runs against a reference, iterative refinement of the rule set, and a swappable search provider layer for cost and stability reasons.
Discover over 15,000 top freelancers
Statistics of experts using RxJS
Aggregated from the professional profiles of matched freelancers.
Experience
20 years (Germany: 19 years)
Position duration
1.4 years (Germany: 1.7 years)
Positions per freelancer
15
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Telecommunication
Certification focus areas
Information Technology, Business Intelligence
Bachelor's degree or higher
86%
Master's degree or higher
57% (Germany: 28%)
Doctorate
29% (Germany: 8%)
Certifications per freelancer
0 (Germany: 2)
Most common languages
German, English, Hungarian
Speak two or more languages
100% (Germany: 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 Munich 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 Munich 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
Mastering Asynchronous Data Streams
Reactive programming relies on managing asynchronous event flows with precision. Specialists in this domain use Observables to treat events, HTTP requests, and user interactions as continuous streams. This approach eliminates complex callback nesting and simplifies error handling in highly interactive web applications.
Ecosystem and Framework Integration
While deeply integrated with Angular through HttpClient and the router, this technology also enhances React and Vue applications. It integrates with state management libraries like NgRx or Redux Observable. Experts seamlessly combine these tools to build highly responsive user interfaces that handle concurrent data operations without blocking.
Typical Deliverables and Solutions
- Implementation of custom operators for specialized data filtering and transformation.
- Architecture of global reactive state management systems using NgRx.
- Elimination of memory leaks by implementing strict subscription lifecycles.
- Design of real-time dashboard updates via WebSocket connections.
- Optimization of complex autocomplete and search input event streams.
When to Bring in External Expertise
As frontend codebases grow, managing race conditions and complex state transitions becomes difficult. Local businesses in Munich, from automotive software units to fintech platforms, rely on reactive programming to manage high-frequency telemetry and trading data. A specialist resolves performance bottlenecks and establishes scalable architecture patterns early.
High-Performing Specialist Traits
Top-tier professionals demonstrate deep expertise in reactive patterns rather than just writing basic pipelines. They write clean, declarative code using pure functions and avoid imperative side effects. They are proficient in marble testing to verify asynchronous stream behavior under various timing conditions.
Munich Collaboration and Alignment
Local experts integrate smoothly into existing scrum teams across Munich, adapting to hybrid or fully onsite setups as required. They ensure clear technical communication in English or German to align with product managers and backend teams. This local presence speeds up architectural alignment workshops and sprint planning sessions.
Frequently asked questions
Questions about RxJS? Start with the answers below.
An RxJS specialist designs and manages the asynchronous data flow within web applications. They transform complex event streams, coordinate concurrent API requests, and ensure that the user interface updates reactively without freezing. This expertise prevents common bugs related to race conditions and out-of-order data delivery.
While Promises handle single asynchronous events, RxJS is designed for streams of multiple events over time. It offers powerful operators for filtering, combining, and delaying data, which native Promises cannot do. Additionally, reactive observables are easily cancelable, giving experts much tighter control over network requests and system resources.
Many industrial and automotive enterprises in Munich require real-time telemetry dashboards and IoT visualization tools. Implementing these complex systems with RxJS ensures that continuous streams of sensor data are processed and rendered efficiently. Local specialists help these firms build robust frontends capable of handling intense data throughput.
A strong RxJS professional must have deep knowledge of TypeScript and modern frontend frameworks, particularly Angular where reactive patterns are native. They should also be skilled in state management architectures like NgRx, understand WebSocket protocols, and be proficient with testing frameworks like Jasmine or Jest for asynchronous code.
Yes, RxJS experts can easily collaborate remotely using standard Git workflows, code reviews, and video conferencing. However, for critical architecture phases, many Munich companies prefer a hybrid model where the specialist joins key kick-off sessions onsite to align on data contracts and state boundaries.
High-quality code is declarative and avoids nested subscriptions, which is a common anti-pattern. A skilled RxJS professional will make extensive use of pipeable operators and ensure that subscriptions are cleanly disposed of to prevent memory leaks. Their code should also include comprehensive marble tests to validate complex timing scenarios.
While generalists can write basic reactive pipelines, a dedicated RxJS expert is crucial when scaling complex applications. They understand how to design advanced custom operators and optimize memory usage across large codebases. This specialized knowledge saves significant development time and prevents structural architectural errors.
Professional proficiency in English is standard for codebases, documentation, and technical discussions in Munich. Depending on the company culture, German language skills may be preferred for daily stand-ups and cross-department collaboration, making bilingual RxJS specialists highly valuable.
The average hourly rate of freelancers in Munich, Germany who have used RxJS in their recent projects is 87 €, which corresponds to a daily rate of about 695 € based on an 8-hour working day.
Of the freelancers in Munich, Germany who have used RxJS in their recent projects, 86% hold at least a Bachelor's degree, 57% hold at least a Master's degree, and 29% hold a doctorate.
On average, freelancers in Munich, Germany who have used RxJS in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 1.4 years.
The most common languages among freelancers in Munich, Germany who have used RxJS in their recent projects are German (100%), English (90%), and Hungarian (20%).
The most common industries among freelancers in Munich, Germany who have used RxJS in their recent projects are Information Technology (90%), Banking and Finance (70%), and Telecommunication (70%).
The most common business areas among freelancers in Munich, Germany who have used RxJS in their recent projects are Information Technology (100%), Product Development (100%), and Project Management (50%).
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.
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Philipp Thomaschewski
FRATCH CEO
