I’m Lawrence, a Site Reliability Engineer at GoCardless. My team focuses on scaling our payments API across the globe while providing a reliable and robust service to our customers.

My writing will centre around the technical challenges I face on my day-to-day. You can expect to see posts about Postgres, Kubernetes and general engineering problems that find their way to an SREs desk. Hopefully this can become a platform for sharing the more interesting technical highlights of an SREs role within a scale-up organisation.

While I infrequently use Twitter, if you have questions or feedback about the content then I’ll happily field it at @lawrjone.

Open-Source Projects

These include individual projects, individual efforts that have been adopted by my company and work that was done purely within my capacity as an employee.

theatre

This project contains GoCardless Kubernetes extensions, mostly in the form of operators and admission controller webhooks. The aim of this project is to provide a space to write Kubernetes extensions where:

  1. Doing the right thing is easy; it is difficult to make mistakes!
  2. Each category of Kubernetes extension has a well defined implementation pattern
  3. Writing meaningful tests is easy, with minimal boilerplate

pgsql-cluster-manager

pgsql-cluster-manager extends a standard highly-available Postgres setup (managed by Corosync and Pacemaker) enabling its use in cloud environments where using using floating IPs to denote the primary node is difficult or impossible. In addition, pgsql-cluster-manager provides the ability to run zero-downtime failover of the Postgres primary with a simple API trigger.

diggit

The goal of Diggit is to provide a tool capable of generating insights about code changes in the context of all those that came before them. This tool would be run in the code review process to aid decisions about whether the proposed change will have a positive impact on the system.

coach

Coach improves your controller code by encouraging:

  • Modularity - No more tangled before_filter’s and interdependent concerns. Build Middleware that does a single job, and does it well.
  • Guarantees - Work with a simple provide/require interface to guarantee that your middlewares load data in the right order when you first boot your app.
  • Testability - Test each middleware in isolation, with effortless mocking of test data and natural RSpec matchers.