RxJS Experts in Berlin
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Meet FRATCH Experts in Berlin, who have recently used RxJS
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.
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.
Julien Look
Last position:
MLOps Engineer at SAMGEN
- Building and scaling cloud infrastructure on GCP to support a SaaS platform for industrial clients
- Designing and implementing a data-driven DevOps pipeline for streamlined deployment and CI/CD workflows
- Collaborating with Data Science team on MLOps workflow to automate integrated retraining
Gregor Doroschenko
Last position:
Founder, Principal Software Architect & Technical Consultant at Hold My Code GmbH
- Frontend modernization (multiple client engagements): Angular version upgrades, architecture refactoring, performance optimization, state management restructuring, and UI library consolidation resulting in faster load times and improved end-user experience across all projects.
- Web development: High-performance landing pages and company websites for SMB clients built with Next.js, SvelteKit, PayloadCMS, and TailwindCSS optimized for speed, SEO, and conversion.
- SaaS product development: Architecting and building an AI-powered platform for photography studio operators (PoC phase) with full-stack TypeScript: Angular frontend, NestJS backend, PostgreSQL, LLM integration (Gemini/Claude) for intelligent workflow automation.
- AI integration: Developed a PoC for AI-generated podcast avatars using the Gemini API for content production workflows.
- Angular deep dive workshops: Delivered 20+ workshops (3–5 days each, 8–10 participants) in a hands-on format where participants build a demo application modeled after their real business domain.
Olaf Nouvortne
Last position:
Frontend Engineer at Danaher/Hach Lange GmbH
- Developed a SolidJS frontend UI for a spectrometric water analysis system on an ARM-based embedded Linux platform
- Prototyped UI in TypeScript React/Nx with LitElements and MQTT integration
- Built production UI using SolidJS, SUID, i18next, Ajv, MQTT.js, C3.js
- Refined requirements with UX team and water analysis system engineers
- Defined and documented system architecture, MQTT message formats, frontend architecture, and development setup
- Set up frontend system from scratch, implemented domain-oriented type system, UI components, and application state
- Managed MQTT pub/sub services and schema-based message validation in frontend
- Coached two junior frontend developers
- Worked in an agile remote team using JIRA, Git, and Bitbucket
Konrad Abe
Last position:
Senior Software Developer at Project Holi / Holistic Foundation
Working on our inhouse React-Native based platform / ecosystem of tools and integrations (GoodNews, BetterPlace etc.) for social sharing, donations, ethic news and organisation of initiatives centered around charity work.
- React Native + Web (Typescript)
- Webpack
Konstantin Kurshunzhi
Last position:
.NET Senior Full-stack Software Developer at DINA Elektronik GmbH
- Tech-Stack: C#, XAML, WPF, MongoDB, Azure Cloud, Azure DevOps, Resharper, Rider, OAuth2.0, REST, XUnit, NSubstitute, FluentAssertions
- Designed and implemented the IO architecture for improved data flow and efficiency.
- Developed a new desktop application from scratch, improving user experience and functionality.
- Led the implementation of daily stand-ups, software refinements, retrospectives, and project planning.
- Wrote unit and integration tests to ensure code quality and stability.
- Conducted code reviews and mentored junior developers.
- Played a key role in the company's digitalization efforts.
- Managed a team of 4 software developers, providing leadership and direction.
Michael Wetzl
Last position:
TUI AG / Robinson
- Developed an Internet Booking Engine (IBE) (Saber and Juniper) and other microservices
- Backend development with PHP and Symfony, endpoint and interface implementation
- Unit and integration tests
Discover over 15,000 top freelancers
Statistics of experts using RxJS
Aggregated from the professional profiles of matched freelancers.
Experience
18 years (Germany: 19 years)
Position duration
2.3 years (Germany: 1.7 years)
Positions per freelancer
12 (Germany: 15)
Top business areas
Information Technology, Product Development, Operations
Top industries
Information Technology, Manufacturing, Retail
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
83% (Germany: 86%)
Certifications per freelancer
2
Most common languages
German, English, Japanese
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 Berlin 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 Berlin 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 streams
RxJS, short for Reactive Extensions for JavaScript, is used to handle async data as streams. It fits UI events, API calls, timers, and real-time updates where promise chains become hard to read. Teams use it to keep data flow explicit and easier to reason about.
Common use cases
- Angular forms, routing, and component events
- Live search, chat, and notifications
- Cancellation, retry, and request orchestration
- WebSocket and event-stream handling
- Node.js services that combine async sources
Ecosystem skills
Strong specialists know observables, operators, subjects, schedulers, and error handling. They also understand when to combine RxJS with Angular, TypeScript, and Node.js, and when a simpler pattern is better. Good work here is about readable pipelines, not clever code.
When to bring in help
Companies usually look for freelance expertise when an app has tangled subscriptions, slow UI reactions, or brittle async logic. A specialist can refactor streams, add tests, and document patterns for the team. In Berlin, this often matters for product teams that work across browser apps, internal tools, and backend services.
What strong experts deliver
- Clean observable design and operator choice
- Safer error, retry, and cancellation flows
- Testable stream logic and maintainable patterns
- Guidance for Angular or Node.js integration
- Reviews that reduce memory leaks and hidden side effects
Quality signals
Look for people who can explain why they use RxJS instead of ad hoc callbacks or overgrown promise chains. Strong professionals can trace data flow, spot subscription issues, and keep code predictable under load. They should also know common ReactiveX concepts and how they map to JavaScript.
Frequently asked questions
Key details about RxJS, drawn from the questions we get asked most.
RxJS is used to manage asynchronous events as streams. That makes it a strong fit for UI interaction, search-as-you-type, WebSocket updates, retries, and other flows where data arrives over time. It is common in Angular apps and in Node.js services that need to coordinate several async sources.
A promise handles one result, while RxJS handles many values over time. That is useful when you need cancellation, combination, filtering, or a long-lived event stream. For a single API call, a promise may be enough; for coordinated async flows, observables are usually the better fit.
Yes. Reactive Extensions for JavaScript is the full name behind the RxJS abbreviation. Searchers often use both names, but they refer to the same library and the same observable-based approach.
A strong RxJS specialist usually works comfortably with TypeScript, Angular, and Node.js. They should also understand testing, API integration, and how to write code that stays readable under heavy async use. In many projects, knowledge of state management and browser performance matters too.
Bring in RxJS expertise when stream logic has become hard to maintain, when subscriptions leak, or when async flows need a rewrite. It also helps when a team is introducing Angular patterns or needs a cleaner way to handle retries, cancellation, or event coordination. The best time is often before the code base becomes difficult to change.
Yes. RxJS work is usually code-driven and can be done remotely with shared repositories, ticketing, and screen reviews. For Berlin teams, on-site time can help early discovery or workshop sessions, but day-to-day stream work is often remote-friendly.
Look for clear observable chains, correct error handling, and a good use of operators instead of nested callbacks. A strong RxJS professional can explain why a stream is structured a certain way and can show how tests cover edge cases. Readability is a major signal of quality here.
Ask which parts of the system use RxJS, where the current pain points are, and whether the expert has worked in Angular, Node.js, or both. It also helps to ask how they handle subscriptions, teardown, and testing. Those answers quickly show whether they can improve the code or only talk about it.
The average hourly rate of freelancers in Berlin, Germany who have used RxJS in their recent projects is 75 €, which corresponds to a daily rate of about 599 € based on an 8-hour working day.
Of the freelancers in Berlin, Germany who have used RxJS in their recent projects, 83% hold at least a Bachelor's degree.
On average, freelancers in Berlin, Germany who have used RxJS in their recent projects have 18 years of professional experience, with a single engagement typically lasting around 2.3 years.
The most common languages among freelancers in Berlin, Germany who have used RxJS in their recent projects are German (100%), English (100%), and Japanese (25%).
The most common industries among freelancers in Berlin, Germany who have used RxJS in their recent projects are Information Technology (100%), Manufacturing (88%), and Retail (63%).
The most common business areas among freelancers in Berlin, Germany who have used RxJS in their recent projects are Information Technology (100%), Product Development (100%), and Operations (63%).
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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