Applications like health care and financial services require high security and data privacy. When security is critical, there are benefits to separating the web front end from the back end using a well defined API.
In traditional applications, the web application talks directly to the database. If an attacker compromises …
Over the years we have done lots of projects where we migrated an application from one platform to another. We might do this to solve performance issues or to switch to a better technology stack. This can be a challenge when you have a big app that is in production …
When I design systems, one of my favorite things is looking at "abuse cases" which define how they behave when confronted by bad actors.
I am a big fan of cryptocurrencies. They give us an opportunity to design systems which enforce and incentivize behaviors, e.g. removing risk and rewarding …
One of the most important decisions we make in product development is when to make a release. From a business perspective, it's better to release early and often, with a "minimum viable product".
It's also important to define explicit technical quality criteria, or we will waste a lot of resources …
Everyone wants to have a beautiful graphical design for their product. The problem comes when graphical design becomes more important than usability and affects the efficiency of the development process.
There is an anti-pattern we call "graphical design driven development." The way it goes is that the client starts by …
We often need to estimate development projects which have both iOS and Android. It's tempting to say that Android will be the same, but what we have found is that Android takes more effort.
The rule of thumb in Silicon Valley is that it takes two to three times the …
When we create products, it's important that they help specific users with their issues, not generic users. It's easy to create a list of features, all of which sound good, but don't provide a compelling solution to a specific problem for a specific user. Without that, people won't buy your …
User stories are the "Director of Operations" view of the world. They describe step by step how the business works, and what the software needs to do to support it. They should be done after we have defined the user personas, to make sure we are starting from users and …
Here are the slides for the presentation on performance tuning Elixir I gave to the local Elixir user's group.
One definition of a startup is "a company in search of a repeatable business model." If we have a clear idea of what the customer needs, what they are willing to buy, and have built the product that satisfies them, then we are no longer a startup, we are an …
- db migrations
- functional programming
- graphical design
- know your customer
- rate limiting
- static assets
- user experience
- user stories