Karma (pre-seed) | Senior Backend / Full-Stack Engineer (Founding Team)
Location: London, UK | ONSITE (3-5 days London)
Contact: careers@karmapt.com
Compensation: £75,000 - £100,000 base + meaningful equity
About the Role
We're a small London team, 2+ years in, building a real-time consumer platform powered by AI in a category that doesn't exist yet, going after a problem worth solving. Free for users, brand-funded on the commercial side. We have a working iOS prototype, validated UX, and an advisory board across enterprise tech and behavioral science. Alpha launches are lined up for later in 2026.
The founding tech team is already in place across iOS, Flutter, AI/ML, and product design, with backgrounds across agentic AI, consumer fintech, and mobile at scale. The seat we're hiring for is the founding backend / full-stack engineer who'll own the architecture. You'll be responsible for APIs, the data layer, real-time systems, and cloud infrastructure. You'll design it from scratch alongside the rest of the team, built for consumer scale from day one.
Requirements
We are looking for someone who:
- Has built and scaled backends for consumer products under real load. Social, marketplace, or community experience is a strong plus.
- Is fluent in Python, Go, Node, or similar. Has strong opinions on API design, microservices, and data modeling.
- Is comfortable with event-driven architectures, real-time systems, and AWS or GCP at production scale.
- Bonus: Experience with ad-serving infrastructure, partner APIs, and rewards/loyalty systems.
- Is UK-based already (no net-new visa sponsorship for this role), and able to work in our London office most days. We're a small team that works best in the room together.
Additional Information
We're vague on the concept for stealth reasons. We're happy to take you through our prototype on a call.
To Apply
Email careers@karmapt.com and mention Hacker News in your note. I'll come back quickly.