Fullstack Developer React Nodejs

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.