Technical Co-Founder // Startup CTO (Go and React) (City of London)

We’re looking for a high-caliber engineer to join as a CTO. You should be deeply hands-on with code, technically opinionated, and capable of building production systems from scratch. This is a role for someone who enjoys execution but also has the potential (or ambition) to lead technology at a company-defining level.

• Build and own core infrastructure and backend systems
• Design and implement APIs, data models, and scalable services
• Collaborate closely with founders on product direction and technical architecture
• Ship code fast, validate assumptions, and iterate
• Lay the groundwork for the future engineering team (tooling, processes, and architecture)

• Proficient in one or more modern backend languages (e.g. Python, Go, TypeScript, Java, Rust)
• Strong systems design skills — you can model real-world systems and reason about scale, latency, and trade-offs
• Comfortable building from zero — greenfield work doesn’t scare you; in fact, you prefer it
• Experienced with cloud infrastructure — AWS, GCP, or similar; IaC (Terraform, Pulumi, etc.) is a plus
• Competent with databases and data modeling — SQL and NoSQL, designing schema for scale
• Comfortable writing tests and deploying production systems — you care about code quality and reliability

• Worked at a Pre-Seed or Seed-stage startup through to Series A
• Built or deployed software used by enterprise customers
• Experience with applied machine learning or MLOps (not just academic or notebook-based work)
• Exposure to event-driven architectures, streaming systems (Kafka, etc.), or real-time data pipelines
• Frontend experience in React, TypeScript, or similar modern frameworks

• Early-stage equity and the opportunity to shape foundational decisions
• High ownership, zero bureaucracy — build what matters, fast
• Founders who value engineers, ship code, and work closely with you
• A role that grows with you — if you have CTO potential, you’ll have a path

You should apply if:

You’re an engineer first — you solve problems through code, you like building things that work, and you’ve got the technical depth to back it up.