Tuesday, November 13, 2012

Hack the scope, Engineer the solution


Lately, it seems like startups have become the center of attention. Coworking spaces and tech-meetups have sprung up everywhere. The term "hack" which used to have a negative connotation, is now viewed in more positive light. And given the agile and lean movement, it appears to me that hacking things up sounds like something cool.

Before I get to my point, it's worth talking about two great companies with different principles.

After some reading and talking to people, my understanding is that Facebook has the "hacker culture", where people try to make things happen as quickly as possible, test it out, and fail fast if it doesn't work. I think video on Facebook was hacked in one day or so.

On the other hand, Google "engineers" software. If you don't know Jeff Dean, know him a little bit. The reason I brought up this guy is to give you a peek into the amount of science that goes behind building software at Google.

This is pure speculation. What I think about the two companies is possibly inaccurate, but that doesn't change what I'm trying to get at. I wanted to talk about hacking versus engineering.

Given these definitions:

  • hack = come up with something quickly that works
  • engineer = create something based on well-thought and sound principles

When you code, how often do you hack and how often do you engineer?
1) always hack
2) try to engineer, but hack when there are time constraints
3) always engineer

Test-driven development has made (1) a viable solution. We can come up with something quickly, and if something needs changing in the future, we have test cases to prevent regressions. I think a lot of startups go with (1) just to validate ideas or create demos for investors.

In established companies, I would think (2) is what a lot of people do. I do it too. During slow days, I have all the time to think very carefully about the design of the software I'm writing. But when there are tight deadlines, I tend to write something that works, and add a TODO comment to come back and finish it later (if I don't forget).

I think governments and financial institutions do (3).

Although I do (2) a lot, I'm not really happy with it, because most of the time, there are time constrains. I feel bad when I have code that works but could have been written better if there was a little more time. Well, everybody would write better code given more time, but I recently came to a realization that we can still write good code even with we have the same amount of time.

It is possible to always engineer software. What we need to do is hack the scope instead. So I'll add (4) hack the scope and engineer the solution.

So what does this mean? Let me give an example.

Suppose I need to write a noob-detector. It's a device whose alarm goes off when noobs are around. I have this HUGE third-party library that claims that it implements the best noob-detecting algorithm in the world. However, its API is so complicated that it takes months to learn how to use it properly, and I need it finished this weekend.

If I went the (2) route, I would randomly tinker with the API until it kind of does what I wanted it to do. At first glance, it seems to work. It detects noobs when I test it. However, I might not be aware that the way I used the library only detects asian noobs. (By the way, asian noobs are hard to find.)

But if I went the (4) route, I would see that the scope is too large. I hack the scope instead. There's another library that's fairly simple to use, but uses an inefficient algorithm. Yet, its slowness is tolerable. I loosen the requirement that the software needs to run with the state-of-art algorithm and use this library. With this library, I can write beautiful code that does the right thing. At the end, this version is less buggy, and correct according to the new requirement.

In a sense, I am tackling the problem as early as possible to save time, and this goes along well with productivity principles.

Sure it sounds like common sense, but even after writing code for so many years, I still fall into trap (2) all the time. I'm getting better at it though. Hope this helps others as well.

2 comments:

  1. One variable that should factor into weather to hack or engineer a solution is how often it needs to be maintained, and who else needs to maintain it.

    If I'm writing a noob detector for my small game server, I'd probably just hack it. If I'm writing a noob detector for a WOW patch, I'd engineer it.

    Hacking code is more fun, easier, and faster most of the time. The problem is that you doom anyone else who needs to work with that code to hours of head to keyboard pounding! (Depending on the quality of your comments/documentation).

    ReplyDelete
    Replies
    1. That is a totally valid point. Thanks!

      Engineering CAN be more fun if you get a kick out of elegant solutions more than seeing runnable software sooner. I won't argue with easier or faster though. :)

      Delete