Fullstack Developer (React/ Node.js)

Let’s get straight to the point — we’re building the next chapter in interactive fitness. We’re a team of tech-driven fitness enthusiasts who believe that working out should be something people actually enjoy. So we started designing. From the ground up.

The result? A one-of-a-kind device — a smart IoT-powered strength training machine that combines advanced hardware with an AI-powered personal coach. It’s built for effective, personalized strength workouts at home, with real-time feedback, tracking, and progress you can feel.

This project is being developed for an Israeli startup in the fitness space, aiming to redefine how people train at home through a truly innovative product.

Our team brings together experienced designers, product managers, and top-tier software and hardware engineers — many of whom have worked on some of the most recognized consumer tech products out there. Now, we’re combining our skills to build something that will reshape home fitness — engaging, effective, and genuinely rewarding.

We can’t wait to show you what we’ve been working on.

Workplace: Warsaw (at least 4 days per week in the office)

Your responsibilities

• Design and implement highly scalable and performant backend systems, focusing on low latency and high throughput.

• Develop complex, scalable backend services from the ground up using cutting-edge technologies such as serverless architecture, AWS, and big data.

• Deliver high-quality software on time by collaborating with the team on backend optimizations, and taking ownership of the process

• Utilize Continuous Integration & Delivery and/or Test-Driven Development to ensure code quality, performance, and reliability.

• Conduct performance profiling and tuning on backend systems to achieve optimal efficiency.

  
  

Our requirements

• A seasoned software engineer with 5+ years of hands-on experience in backend development, preferably in high-performance, low-latency environments.

• Experienced in cloud platforms, particularly AWS, and familiar with serverless architecture and microservices.

• A problem-solving attitude, eager to tackle performance and efficiency challenges in backend systems.

• Hands-on experience with NoSQL data stores like DynamoDB, Elasticsearch, etc.,

• Fluent Polish and English is a must

  
  

Optional

• Experienced with building microservices systems in a serverless environment - a strong advantage.

• Experienced with Nodejs, GraphQL, and Typescript - a strong advantage.

• Experienced in multiple front-end platforms, including iOS, React, Android, and API services - an advantage

• Experienced with Swift/SwiftUI - an advantage.

• Experience integrating GenAI technologies - an advantage.

• Preferably with a degree in computer science or similar.