Senior Full Stack Software Engineer React +.NET (gn)

Berlin, Berlin, Germany

About ATworld

ATworld is redefining the way we work and connect. We offer a flexible, connected, and ownable fourth space where individuals and companies can access resources, services, and communities anytime, anywhere.

Powered by a sleek mobile app built with React Native, ATworld makes finding your perfect workspace effortless, giving members instant access to hundreds of inspiring locations across Europe. Our rapidly growing community launched successfully in March after a thriving closed beta and we have already unlocked 400 locations for our members.

Supported by hotels, offices, and partner locations owned by Aroundtown, ATworld is rapidly expanding across Europe. We are committed to proving that doing good and doing well can go hand in hand. Backed by one of Europe’s largest real estate funds, ATworld has the resources, scale, and operational excellence, including ISO‑27001 certification, to pioneer the future of work.

We are a small, high‑performing and dynamic team that thrives on innovation, collaboration and a healthy dose of fun. Now entering an exciting growth phase, this is the perfect time to join and help us scale.

Job Scope

We’re on the hunt for a Senior Full Stack Developer who isn’t just skilled but truly passionate about making an impact. This isn’t just about writing code; it’s about shaping the very core of the ATworld app as we gear up for massive scale and ambitious plans for 2026.

You’ll be a pivotal player contributing significantly to our React Native mobile app and playing a key role as we begin to build out a new web application to support operations (where your React expertise will shine!). You’ll work side‑by‑side with our experienced CTO and own critical features from concept to launch, ensuring our platform is robust, scalable and delightful for our users.

Responsibilities

Pioneer New Features: Design, develop and deploy exciting new functionalities primarily for our React Native mobile app and later for our new web application.
Build for Hyper‑Growth: Architect and implement solutions that aren’t just functional but inherently scalable, performant and secure because we’re preparing for exponential expansion.
Collaborate & Elevate: Jump into engaging brainstorming sessions and work closely with our CTO and other senior developers to define our technical roadmap and champion best practices.
Craft Elegant Code: Write clean, maintainable and highly efficient C#/.NET Core backend and React/React Native frontend code that stands the test of time.
Lead & Learn: Participate actively in code reviews to share your expertise with fellow developers fostering a culture of continuous learning.
Innovate with AI: Potentially dive into exciting new AI features leveraging Large Language Models (LLMs) to enhance the user experience.
Stay Ahead of the Curve: Continuously explore emerging technologies and industry trends to keep ATworld at the forefront of innovation.

Qualifications & Non‑Negotiables

5+ years of battle‑tested experience as a Full Stack Developer with a proven track record of shipping impactful products.
React is your playground: You’re a wizard with modern front‑end frameworks and can build intuitive, responsive UIs.
C#/.NET Core are your backend fortress: You deeply understand building robust, scalable APIs and services.
RESTful API is your second language.
Fervent dedication to writing secure, top‑tier code; security is not an afterthought for you.
You’re a proactive problem‑solver capable of tackling complex challenges with creativity and tenacity.

Bonus Points

React Native experience.
Hands‑on experience deploying and managing services on AWS.
Previous experience working in a scale‑up environment.
LLM Experience: Familiarity with large language models, especially frameworks like Langchain or platforms like Amazon Bedrock.

What We Offer

A central, meaningful role in a fast‑growing European platform.
Direct collaboration with leadership and strong development opportunities.
A diverse international team that values collaboration and shared ownership.
Competitive salary.

How to Apply

If you would be interested in applying for the position, please use the Apply Now button or directly reach out to:

David Gregor
Co‑Founder & CTO
LinkedIn

We are committed to finding innovative ways to develop its cultural and brand values. It’s this kind of thinking that creates a unique work environment by rewarding talent, celebrating diversity and encouraging forward thinking.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability status or any other characteristic protected by applicable law.

Required Experience: Senior IC

Key Skills Spring, .NET, C/C++, Go, React, OOP, C#, AWS, Data Structures, Software Development, Java, Distributed Systems

Employment Type : Contract
Experience: years
Vacancy: 1

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