Back to Case Studies
CASE STUDY
Social platform for coaches and athletes
Client
Social platform for coaches and athletes
Industry
Sport
Product
Backend API
Admin panel
Date
2022–2025
Skills
Ruby on Rails
PostgreSQL
RSpec
Dokku
2+
Years of development
2000+
Registered users
30+
Updates released
About Client
A fast-growing startup from the USA that builds digital tools for the sports world – connecting athletes and coaches in one ecosystem. Their main product is a web-based training platform that enables session booking, payment management, and relationship building between users.
Before the platform could take off, it needed a technology partner to clean up the technical foundation and prepare it for scaling. Our task was to take over the backend, stabilize the system, and lay the groundwork for future development.
Client's Problem
The application was originally built by an external team but suffered from a lack of stability, a weak payment system, and hard-to-maintain code. The client was looking for a partner who would not only fix existing issues but also take responsibility for the platform's future technical development.
Challenges for 2N
- Taking over and refactoring a complex system without interrupting live application usage
- Building a robust backend to support payments, coach availability, bookings, and user account management
- Implementing a continuous product development process with roadmap planning, versioning, and testing
What we did
Backend development and takeover
We took over the platform’s backend, implemented a clean architecture, and began developing new features in line with the roadmap. From that point on, we have been the main backend team — delivering over 220 pull requests and continuously improving the product.
Payments and invoicing system
We reworked the Stripe-based payment system — it now supports card payments, invoicing, webhooks, reminders, and exception handling. The system is stable and processes hundreds of transactions every month.
API design and frontend collaboration
Although the frontend is developed by an external team, we design and maintain the API to provide the best possible user experience — for both coaches and athletes.
Automated tests and code coverage
We implemented unit and integration testing using RSpec — every new feature is automatically tested, helping us maintain high code quality and a fast development pace.
CI/CD process
We automated the deployment pipeline — new versions are released to staging and production with minimal manual effort, reducing delivery time and the risk of errors.
Monitoring and stability
We use monitoring tools to track system performance and availability. We also introduced an alert and logging system that enables quick responses to issues and ensures platform stability.
API documentation
We ensured clear and structured REST API documentation, making collaboration with the frontend team smooth and accelerating feature delivery.
Outcome
The collaboration led to a complete technical and product transformation. The app, once unstable and difficult to maintain, became a reliable, efficient, and continuously evolving platform tailored to the needs of both coaches and athletes. We introduced a structured backend architecture, rebuilt the payment system from scratch, and enabled the launch of dozens of new features. The platform now handles thousands of active users, regular bookings, and increasing interest from new teams joining each month. Our work has not only ensured stability and scalability, but also laid the foundation for future product expansion — including analytics, multi-team support, and external integrations. We continue to serve as the core backend team, supporting the client’s long-term vision through consistent releases, high code quality, and trusted technical leadership.
What we accomplished:
- Full backend takeover and responsibility for technical development
- 30+ production updates and dozens of new features
- 2,000+ registered users and consistent month-over-month growth
See more of out case studies
Pal Serwis
Pallet Trading and Logistics
Pallet Trading and Logistics
Founded in 1999, Pal Serwis has emerged as the leading and most reputable entity in the field of pallet trading in the northeastern part of Poland. With an extensive network of delivery and collection points, the company has strategically positioned itself to cater to the local market's demands effectively. Over the years, Pal Serwis has expanded its horizons and is now open to collaboration with local, national, and international partners. The company's success is underpinned by its commitment to reliability, quality, and predictability, as evidenced by its wealth of experience and numerous client references.
Bike-Space
Bicycle Servicing and Repair
Bicycle Servicing and Repair
Bike-Space is a medium-sized company based in Białystok, specializing in comprehensive servicing and repair of bicycles adapted to both recreational and professional riding. The company's primary focus is on providing exceptional service, ensuring that each cyclist receives the highest care and attention that their bike deserves. Whether you are a weekend rider or a competitive athlete, our commitment to excellence remains unwavering.