On-boarding at Trainline


I originally posted this blog on my personal website at dannybrown.net but I thought it might also be relevant here on the Trainline Engineering blog.

Trainline Homepage

Trainline Homepage

I’m now entering the sixth week of my time at Trainline. It’s been quite the experience, due to it being my first full-time job and it being a time of significant changes at Trainline in terms of technology, branding and even an expansion into the European rail market.

It’s been great to be in a team of people who know so much about Software Engineering and the systems in use at Trainline, and whom are so willing to pass that knowledge on. I’ve also been blessed with some really cool projects to work on at the start of my trainline career. The first thing I was tasked with doing was replacing the standalone Best Fare Finder application, with deep links to an improved Best Fare Finder experience which was already built in to the main ticket purchasing flow.

The Best Fare Finder allows you to find the cheapest tickets avaliable between two stations if you’re willing to be flexible on dates and times of travel

Trainline Standalone BFF

Trainline Standalone BFF

The Standalone BFF, pictured above, wasn’t responsive; didn’t look like the the newly rebranded trainline homepage and purchase funnel and required additional maintenence. Removing it and using the best fare functionality baked into the main purchase flow improved the experience for users and reduced the costs, both financial and of technical debt, to the company. The inline best fare finder which replaces it can be seen below:

Inline BFF

Inline BFF

The pictures of popular locations you can see in the screenshot of the homepage, or Roundals as I’ve started calling them (inspired by the name of the famous Tube logo which is a similar shape), had to be updated as part of this work. This was quite exciting as it meant that within a week of my first job I had pushed a change, albeit relatively minor, to the home page of a website with millions of visitors a month. The deep linking I developed for this inline BFF is now also used in Trainline emails to customers.

As part of doing this work I discovered that some parts of the Best Fare Finder backend were a bit difficult to work with and that access to useful information could be greatly simplified leading to a reduction in the number of places in which static data was manually updated by humans. I proposed that a RESTful API was developed with some easy to understand endpoints that delivered a JSON response.

My development manager and product manager were supportive of the idea and therefore I started working on a set of requirements and use-cases for the product, which I simply called BFF API (Best Fare Finder Application Programming Interface). The resulting system is written in Node.js 4 — making great use of all the new features of ES6 such as block scoping, destructuring and arrow functions — Hapi.js and an assortment of the libraries avaiable from npm.

It is unlikely that this system will be made user facing itself, but it may contribute to some of the things a user can see from the backend.

I’ve learned rather a lot in the last few weeks: including the business and technological processes involved in developing enterprise quality software, how to navigate through and modify/maintain legacy systems and some more about the Node.js ecosystem. Expect a blog post in the new few weeks about how I’ve changed the way I develop Node.js code in order to aid correctness and the ability to tests things.

Whilst some parts of the transition from academia to Real Life™ have been difficult to get used to (what is waking up at 7am and commuting?!) overall I’m enjoying the new experience and feel like I’m learning as much or more than I was at university and being paid to do so — the best of both worlds!

Danny Brown
(Graduate) Agile Developer at Trainline

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