Day 4: Notes on Stateless Design in Interactive Systems

Statelessness sounds elegant until you start building interfaces that must remember who you are, what you just did, and why it matters.

Most modern systems chase scalability through stateless APIs—containers can spin up or down freely, requests can hit any instance, and storage handles persistence.

But when the experience layer becomes interactive, purely stateless design starts to creak.


Where Statelessness Shines

  • Horizontal scaling: Each request is independent, so load balancing is trivial.
  • Fault tolerance: No single session failure can corrupt global state.
  • Simplicity in deployment: No sticky sessions, no shared memory puzzles.

Where It Hurts

  • User context: You need to rebuild understanding on every request.
  • Real-time collaboration: Shared presence and transient state demand continuity.
  • Personalization: Without context, every user looks the same to your system.

To compensate, developers start layering caches, context stores, and event streams—each re-introducing some form of “remembering.”

In practice, most systems end up soft-state, not truly stateless.


A Working Balance

  • Keep computation stateless, but store intent externally.
  • Let the front-end or an edge layer manage short-lived memory.
  • Use immutable logs for truth, transient stores for flow.

When stateless design meets interaction design, the goal isn’t purity—it’s recoverability.

If the system forgets, it should still know how to remember again.

See you tomorrow.

Namaste.

Nrupal

Software product shelf life

When is a software product dead?
All software products are designed with a particular shelf life in mind. This shelf life means the amount of time the software survives without being ported to a different technology.

We can say that a software product is dead when
1. We have to port the solution into a different technology to be usable.
2. We have to re-architect for a major feature upgrade to keep its usability.
3. There are no more users using the software.
4. The back end services if any, cannot be supported and will be retired.

when one or more than one of these happen, we can declare that our beloved software product has reached its end of life. All software products go through following common stages. These are not the stages in a software development life cycle which ends at maintenance.
1. Concept
2. Risk assessment
3. Technology stack assessment/design
4. Development
5. Testing
6. Deployment
7. Maintenance
8. Implementing new features + maintenance.

After a few iterations of the above the product reaches stability and can be considered to be mature. This is when the product is not actively developed on and only minor enhancements or bug fixes will be performed. Then after a little while the product becomes less useful and will require more effort to maintain it. Which is when it has to be identified as it reaching its end of life. At this stage a new one can be developed or this re-architected to give more shelf life.

It is required to identify and accept the end of life of the product and start planning for the stages after it.

 

Namaste

Nrupal