Which one is the best unified API gateway? — Permalink: https://gunargessner.com/graphql-federation-vs-stitching Apollo Federation and Hasura Schema Stitching both can serve as our company’s centralized API gateway, but they have very different philosophical stances and provide different features. Federation assumes a company’s schema should be a distributed responsibility We’ll want to use Apollo Federation iff we believe services should be able to extend each other’s schemas.

Permalink: https://gunargessner.com/why-we-chose-google-automl CONTEXT: Invisible is going Machine Learning, and our first goal is to use ML to aid us in routing client delegations. When a client sends us an email, we’ll use the emails’ content to infer whether the task should be routed to the “Calendar” team, the “Lead Sourcing”…

How to generate Bitcoin addresses from an HD Wallets’ XPUB key. — Bitcoin wallets are nothing but private/public key pairs. The private key is your “password”, while the public key is your “address” for receiving currency. It is advised that we use different addresses for each transaction, in order to increase our privacy and security. Normally one would simply generate multiple keys…

I’ve recently implemented GraphQL at Invisible. These are some of the things that we’ve realized together. Getting buy-in from stakeholders is perhaps as important as writing the code. I hope this post helps you with that. PS: I’ve prioritized clarity over correctness. GraphQL: Cost of investment. Requires training. It’s one more thing for Engineers…

A Note on Uncontrolled Forms (you can skip this). — I don’t know about you, but when possible I prefer to use uncontrolled components and refs—as demonstrated below. Resetting Uncontrolled Forms. The key prop is commonly used to efficiently render React Components from arrays, but you can use it for any component. We can “abuse” this property to force React to rebuild…

Hi! This is a part of my series on mental models. Click here for other parts. What Is a Record Locator. A record locator can be used to provide a human-readable representation of a database primary key, providing users with a short, easy-to-read and pronounceable string, like those alpha-numeric confirmation codes that flight companies…

Checking field presence and absence. — Let’s say you want a field to either contain something of type T, or not contain the field at all—in effect, disallowing { field: undefined }—much like our friend Greg here. It seems resolving this problem would require TypeScript to implement Exact Object Types, but we’re not going to…

Property-based Testing in a nutshell. Hi! Welcome to part one of my series on mental models. Click here for other parts. Let’s say we have ourselves a sorting function called mySort , Standardized testing would ask you to come up with some values to be tested, whereas Property-based Testing asks you to declare…

I’ve recently tipped my toe on a few topics regarding our conceptual models around the systems we build and have decided to share with you what I’ve learned. I’m going to try and define each one of these tools using my own words. If I can get you to understand the gist of each one, perhaps you’ll be able to identify uses for them in your own projects. My definitions will by no means be exhaustive as I’m prioritizing simplicity over correctness. Bottom-line: read at your own peril.