What Does Lola.com's Development Tech Stack Look Like?
tl;dr: How does Lola.com build the best corporate travel management software on the planet? It all starts with our stack.
At Lola.com, our goal is to build the simplest, most intuitive corporate travel platform on the market. And, as we all know, it takes a lot of work, and technology, to build something so powerfully simple.
We get a lot of questions about what tools, frameworks and languages we use to build the Lola.com platform, so we decided to dive deep into the ins and outs of our development technology stack.
Lola has a service-oriented architecture. Our user-facing applications (web and mobile) talk to a centralized "lola-server," which manages communication with a variety of specialized services that expose functionality for search, booking, scoring, secrets storage, messaging, analytics, and the like. All of these services are written in Python, using the Flask framework, and we use a customized Python ORM called peewee to manage queries to our (Postgres) database. We use Elasticsearch for certain custom queries (most notably for our autocompletion endpoint for looking up specific hotels).
Our user-facing web applications are written in React. Every component is written as a "pure component," with the business logic composed onto it using the high-order-component pattern. (We are looking at upgrading to React Hooks, but that's in the future.) Our native iOS and Android applications are written in React Native, using essentially the same design principles. Our user-facing applications use graphql to talk to lola-server. (The transition from REST to graphql was one of the best investments we made in 2018.)
We integrate with third parties over every imaginable channel. Some partners use SOAP APIs; some use REST/JSON; some use a secure FTP dropbox. We orchestrate our regular data feeds using luigi, Spotify's open sourced Python library for pipelining batch jobs. For all integrations, large or small, we are careful to construct a data model which we map the external data onto. (You can learn more about Lola.com’s integrations here.)
Because we deal with personally identifiable user information (also known as PII) and credit cards, we have to be extremely careful about how we handle this data. We have achieved PCI DSS Level 1 compliance through the use of a clever architecture. We segregate our "secret" storage into a single, highly secure data service which is directly accessible to only a few administrators. This service exposes an API that allows for only the writing of secrets as well as proxying requests to well-known endpoints which need them. Thus, when we need to send a credit card number to one of our partners, the proxy injects the credit card into the request as it is sent. At no point in the control flow does any of our client code ever see the secret, making it impossible for someone to hack our lola-server API to retrieve it.
Development Life Cycle
Lola has a mature software development life cycle. We make heavy use of Github's pull request features. Thus, you can't merge your code without a pull request. Your pull request is required to pass unit tests. And pass linting. Depending upon the security level of the repository, a variety of code reviews may be required before your code can be merged. Once merged, we use continuous integration and continuous deployment tools to ensure that our staging environments (we have dev/staging/prod variants of each of our services, including our mobile applications) are always running the latest code. Everything runs on Amazon Web Services, deployed via Kubernetes. We monitor using X-Ray, pump our logs into Papertrail, and debug with Bugsnag and LogRocket.
It’s impossible to overstate how important our development technology is to our final product, and to our company as a whole. Our mission to create the best possible corporate travel platform — and to constantly improve the technology behind it — means that we are always learning, testing, and integrating new tools.
Have a tool or technology you think we should be incorporating? Drop us a note in the comments below!