The opportunity
Unity Spark is our browser-based game editor, with an ambitious vision for how real-time 3D games are created, shared, and played on the web. As a Senior Backend Infrastructure Engineer on the Spark team, you will be the engineer who makes our services build, ship, and scale. You will write backend code, and you will own how it reaches production on Google Cloud: the CI/CD pipelines, the infrastructure as code, the Kubernetes workloads, and the fleets of stateful real-time servers behind multi-user editing.
Our team moves fast and uses AI coding tools every day. That shifts the work from typing code to deciding what to build, checking it is right, and owning it once it is live. We value generalists who pick up whatever the product needs next, whether that is a new service, a scaling problem, or a failed deployment. You will work closely with backend engineers, product, and partner infrastructure teams, and be the go-to person when production needs to scale or is not behaving.
What you'll be doing
Design, build, and maintain the CI/CD pipelines that take our services from pull request to production, with GitOps-style deployment
Own infrastructure as code for our Google Cloud and Kubernetes estate, keeping environments consistent and reproducible
Scale stateful real-time workloads, including autoscaling server fleets, session routing, capacity planning, and safe rollouts, weighing multiple approaches and leading the design with your team
Write backend services and tooling, including the code that keeps the platform running
Debug production problems across the stack, from load balancing, networking, TLS, and DNS to the services themselves, anticipate failure modes, and fix the cause rather than the symptom
Improve observability with metrics, logs, traces, and alerts, and run load tests that show where the limits are
Use AI coding tools as a normal part of your work, review code and designs, and mentor engineers while raising the team's engineering bar
What we're looking for
A track record building, operating, and owning backend services at scale in production, in at least one modern backend language
Hands-on experience running containerized workloads on Kubernetes, ideally on Google Cloud (GKE)
Deep experience owning infrastructure as code (for example Terraform) and CI/CD pipelines end to end
On-call experience: you own what you run and fix what you find
Sound judgment that teammates trust, comfort with ambiguity and trade-offs, and effective written/verbal communication with technical and non-technical colleagues
Comfort with AI coding tools, reviewing what they produce as critically as a colleague's code
You might also have
Experience running stateful, real-time, or game-server workloads at scale
Experience with GitOps tooling such as Argo CD or Flux, and Helm
Experience with cloud load balancing and edge security, including L7 load balancers, web application firewalls, and certificate management
Experience with the Unity Engine, interactive 3D technology, or backend services for games
Additional information
Relocation support is not available for this position.
Work visa/immigration sponsorship is not available for this position.
Base Salary Range: We determine the base salary range for this role based on your primary work location:
Zone A: £55,700 - £83,500 GBP gross
Zone B: £63,700 - £95,500 GBP gross
This range reflects the anticipated base salary for this position. Beyond base salary, this role may be eligible for equity awards and participation in our company incentive plans (such as annual discretionary bonuses or sales commissions). The final offer amount will depend on several factors, including geographic location and the candidate’s relevant experience, professional background, and skill set.
Benefits
At Unity, we want our team members to thrive. We offer a wide range of benefits designed to support well-being and work-life balance.
Please note: Benefits eligibility, specific offerings, and coverage…