I've been learning backend development by building small projects, but I keep running into the same decision: should I build a feature from scratch to understand it, or use an established library or service so I can focus on the application itself?
Voice and video were a good example. I initially thought I would learn WebRTC, but that quickly expanded into signaling, NAT traversal, TURN servers, reliability, scaling, and monitoring. By the time I understood the scope, I was spending more time on infrastructure than on the product I actually wanted to build. That led me to consider using a communication platform such as iotum instead.
How do more experienced developers draw this line? Is it useful to build something once for educational purposes and then replace it with a proven tool, or should established services usually be used from the beginning?
4 Answers
There is no need to choose one philosophy forever. Build simple versions from scratch when you want to understand how something works, then use mature tools when speed, reliability, and maintenance matter. As you gain experience, you can often understand an implementation from its documentation and behavior without needing to recreate every line of it. The professional skill is knowing both how systems are built and how to assemble existing pieces effectively.
For production work, I usually favor proven libraries and services. They have already had years of bugs found, edge cases handled, and documentation written. Reimplementing encryption, protocol parsers, or other universal infrastructure is rarely a good use of time. Build custom components when the existing options cannot meet your needs, are too expensive or restrictive, or when the component is central to what makes your product different.
Start with your goal. If the purpose is to learn WebRTC, building a small experimental version can be worthwhile. If the purpose is to finish an application, use an existing service and learn the integration instead. It also helps to study foundational technologies separately, so you aren't trying to learn networking, concurrency, scaling, and product development all at once.
A good compromise is to build at the seams. Use off-the-shelf components to get the first version working, but keep the boundaries between them clear. Then, if one area becomes important or limiting, you can replace just that part instead of rebuilding the whole system. This also lets you learn by writing focused prototypes without letting an educational detour consume the main project.
The important part is not treating a third-party component as permanently perfect. Put a clean interface around it so you can replace or extend it later if it becomes a bottleneck.