Join a lean founding team of four as a Senior Backend Engineer to own the architecture of a mission-critical Laravel platform. You will design multi-tenant SaaS systems, build event-driven pipelines, and develop scientific calculation engines for building thermodynamics. This high-impact role directly influences the UK’s transition to low-carbon electric heating.
Senior Backend Engineer at Carno
Carno is building the operating system for the UK's renewable energy industry, cutting administrative friction by 90% for installers. As one of the first five hires, you'll work directly with the founding team to architect a high-scale, multi-tenant Laravel platform that accelerates home decarbonisation. If you have 3+ years of Laravel experience and a passion for building complex SaaS architecture with real-world climate impact, join this lean, high-impact team at the seed stage.
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Location
Remote (United Kingdom)
Compensation
£60k-£80k
Company
Carno
Role overview
Energy
Ai4–10+ employees
Carno is the first ‘whole home’ digital platform for renewable energy enterprises and installer networks. Focusing on heat pumps, hot water, solar & storage. It provides software for heat pump sizing, room-by-room heat loss calculations, home survey data capture, and automated documents like quotes, performance estimates, contracts and compliance to save time and enable the decarbonisation of properties at scale.
What you will do
- Build and maintain a complex multi-tenant SaaS architecture using Laravel, ensuring strict tenant isolation and sophisticated per-organisation business logic.
- Design and implement asynchronous queue pipelines and event-driven patterns using Redis pub/sub to handle high-frequency data workflows.
- Develop and manage shared internal Composer packages and integrate third-party property data APIs to power the core installation workflow.
Who this is a fit for
- 3+ years of professional Laravel engineering experience with proven expertise in building multi-tenant SaaS and managing per-tenant databases.
- Strong fundamentals in modern infrastructure, including AWS (EC2, RDS, S3), Docker containerization, and managing CI/CD pipelines across multiple repositories.
- Proficient in security best practices, including OAuth 2.1, RBAC, and secret management, with a solid grasp of authorisation boundaries in multi-tenant environments.
Why this role is remarkable
- High ownership at a seed-stage company where your architectural decisions define the platform’s foundation rather than maintaining legacy designs.
- Direct daily collaboration with the founding team, including the CTO, CEO, and CPO, in a fast-moving, high-autonomy environment.
- Tangible real-world impact by building software that accelerates the deployment of renewable energy and home decarbonisation across the UK.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Carno wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.