HappyPancake: a Retrospective on Building a Simple and Scalable Foundation
Monday, February 23, 2015 at 8:56AM
Todd Hoff in Example

This is a guest repost by Rinat Abdullin, who worked on HappyPancake, the largest free dating site in Sweden. Initially written in ASP.NET and MS SQL Database server, it eventually became overly complex and expensive to scale. This is the last post in a nearly two year long series of engaging articles on the evolution of the project. For the complete list please see the end of this article.

Our project at HappyPancake completed this week. We delivered a simple and scalable foundation for the next version of largest free dating web site in Sweden (with presence in Norway and Finland).


Below is the short map of that journey. It lists technologies and approaches that we evaluated for this project. Yellow regions highlight items which made their way into the final design.

Project Deliverables

Project deliverables included:

Final high-level architecture is simple to reason about and scale. It was designed to be that way.

Logically the entire solution consists from backend modules (represented by golang packages) and elements of Facebook Flux architecture (grouped together in namespaces by naming conventions).

Such structure helps to maintain the project as it grows in size and complexity.

This design also helps to scale the deployment to handle higher loads.

We can scale backend by:

We can scale frontend by simply launching new instances behind the load balancer.

Solution structure also provides a natural way to split the work between the developers. Given the established published language (contracts of API and events), we can also bring in more developers, assigning them to work on individual backend modules or frontend namespaces.

Lessons Learned

Related Articles

Article originally appeared on (http://highscalability.com/).
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