Site Reliability Engineer (contract)

Job description

Team: Engineering

Location: London, UK

Ably is the world’s fastest Data Stream Network (DSN) spread over 14 data centers and 175+ points of presence. Each day we stream billions of realtime messages to millions of end-users for thousands of developers around the world. Some of the things our platform powers: HubSpot’s chat and collaboration products, live score updates for millions of Australian Open tennis fans, live transit updates for three million Chicagoans. Working at Ably means helping to build the infrastructure that will power and shape the future of the internet.

To see what life’s like at Ably, check out our careers page at

What we do

Ably’s engineering team is deeply technical, collectively bringing a wealth of experience and broad technology skills across infrastructure, security, distributed systems, and much more. The calibre of the code we produce is what excites and motivates us each day. If you enjoy solving hard distributed system problems that are mostly platform agnostic and theoretical in nature, then you'll love working at Ably.


In this role:

You will work with the engineering team on a contract basis, and will have responsibility for all aspects of Ably’s infrastructure services. Together, these provide compute capacity, networking, and all ancillary services required to operate the core services and support the complete development cycle for all Ably products and services.

Ideally we're looking for someone:

  • Who has a deep technical understanding of how systems work top-to-bottom.

  • Enjoys getting their hands dirty, getting things done, and seeing creations from inception through to production use by consumers’ apps.

  • Who understands the Site Reliability Engineering discipline (  and are excited by the idea of infrastructure-as-code and no manual maintenance of systems.

  • Who cares about technical excellence in their work and fitness for purpose in their code.

  • Who can code well in Ruby.

  • Who has in-depth experience with AWS cloud.

  • Who is very technically strong in Linux systems administration and networking.

  • Systems-level security experience.

What’s it like to work as part of the Ably community?

Founded by two engineers who spotted a hard and largely unsolved problem, Ably is, at its heart, an engineering company. To provide the infrastructure required for a high-bandwidth, always-connected world we hire engineers with a broad set of technical skills who are ready and capable of taking on challenging realtime engineering problems.

As a company and engineering team we’re committed to a future internet that’s open and Ably’s engineers contribute to existing open source projects. See 

We want to work in a company of inclusive people who treat each other well. We’re building a company with a diverse set of people who value:

  • Ownership and impact of work. You have real autonomy and ownership over your work with a visible impact inside Ably, and externally on products powered by Ably that you use in your daily life.

  • An environment to thrive. Modern, comfy office in the heart of Old Street. Excellent transport links, lots of great food, bars and restaurants nearby, and multiple work spaces to match your working style.

  • Truly flexible working and not just lip service. We like people to be in the office most of the time, but work should also fit around life and individual ways of working so you’re free to mold hours and environment to your needs.

  • Work is varied and challenging as we’re solving hard, complex problems that push the limits of what’s possible with today’s software and infrastructure.