Founding Engineer - London

This is a hands-on role where you will work directly alongside the founding team to help shape the core technology and company culture. · 3+ years of Software Development experience in Python, Java, C#, C++ · Experience working on an end-to-end development cycle · ...

Join a founding team with a proven record of building successful start-ups at an early-stage cybersecurity start-up redefining how organisations protect data and infrastructure. · ...

This is a true 0-to-1 role for a founding engineer to build AI agents that connect people - real products with real users in London, · ResponsibilitiesBuilding the core product end-to-end across frontend, backend, and AI systems · Shipping fast, owning production, and iterating d ...

A founding engineer position in an early-stage defence technology start-up building mission-critical systems in London. · Design, build, and deploy core technology from day one. · ...

We are looking for a Founding Engineer to build the core platform end-to-end alongside the founders. This is a high-ownership role that combines decision-making, hands-on building, and long-term accountability for production systems. · ...

This is a unique opportunity to help build a transformative new platform at the intersection of software systems, automation, and intelligent infrastructure. · ...

We are looking for a Founding Engineer to join the company at an early stage and help shape the technical and product foundations of Cortex Research. · Cortex Research is a UK-based frontier AI research company building next-generation, UK-native AI systems for both B2B and B2C a ...

Founding Engineer - Competitive Salary + Meaningful Equity: · We're partnering with an early-stage, Series A-backed technology company building a category-defining product in a large and rapidly evolving market. · They've secured strong institutional backing, have real traction, ...

We're working with a top-tier AI startup building real-time AI voice agents powered by LLMs. · Real-time AI voice agents (speech → LLM reasoning → speech) · Backend systems powering low-latency, high-volume voice interactions · Frontend interfaces for internal tools and customer- ...

This isn't another 'early-stage' role with duct-taped systems and vague vision. This team just raised $20M and is assembling a founding engineering group with one rule: only exceptional people. · ...

A well-funded, early-stage AI infrastructure startup is on a mission to remove one of the last major bottlenecks in the physical world. · Ship production-grade code from day one · Own full-stack feature development across infra, tooling, and application layers · Solve hard techni ...

Job summary · Join as employee #4 with genuine founding engineer ownership working on cutting-edge AI: agent reasoning, real-time voice processing, memory systems. · Qualifications5+ years of software engineering experience · Strong backend fundamentals – Python preferred but not ...

We're partnered with a pre-seed AI startup building agentic AI systems that radically improve how knowledge workers think, decide, and get work done. · ...

We're hiring for a seed-stage SaaS startup backed by Balderton that's using AI to fundamentally redefine its product. · ...

Role: Founding Engineer · Company Stage: Seed · Funding Amount: 8 Figures · Location: Central London · Package: Up to £235k · We're looking for engineers who don't wait for tickets to tell them what to do The kind who enjoy jumping into messy problems, talking to real users, snif ...

We are working with an exciting AI start up tackling one of the most crucial challenges for SaaS businesses. · Why join: · High impact & ownership over core product. · Work closely with a high calibre founding team. · ...

We are early-stage product-led company building next generation beer taps. This is founding-level role with real ownership working on hardware firmware manufacturing and field installs. · Design build and iterate on electromechanical systems valves motors sensors · ...

+Job summary · This is not a typical engineering role. · You will build adaptive AI security systems, · design and ship security infrastructure that learns and evolves alongside the AI agents it protects,+QualificationsHands-on experience building production backends · Strong gra ...

Would you like the opportunity to work for a fast-moving AI start-up who are building and scaling software products with creators. · Owning fullstack development across multiple products — designing APIs and data models, building and shipping services, and maintaining quality in ...

An early-stage, · stealth-mode startup is looking for a · Founding Engineer · to join the team in central London. · £180,000 base salary · ...