marble - Founding Engineer, Construction Operations (Software Engineer)
Requirements
• You are a strong fit if you recognise yourself in most of the following: • Software engineering fundamentals: Solid CS foundations including data structures, algorithms, systems design, testing, architecture. • Full-stack web and mobile: You ship production apps from front end to back end. Experience with component-based frameworks and mobile apps real users depend on. • Python backend: Comfortable building APIs, data pipelines, and service integrations in Python. Familiarity with FastAPI, Django, or Flask is useful but not essential, what matters is that you can design clean, testable services. • AI/LLM agentic workflows: You've built production AI processes including agent first workflows, RAG, structured output parsing and understand the gap between a demo and a production-level system. • Cloud infrastructure: You can deploy, monitor, and maintain apps end-to-end on modern cloud platforms (Supabase, Cloudflare, AWS, or similar). • Data modelling: You design schemas that evolve with the product without quarterly rewrites. • Product over features: You measure output in customer outcomes, not code shipped. You'd rather spend a morning with an installer than refactoring if that's where the learning is. • Builder mentality: Ship imperfect on Thursday over perfect next month but you track technical debt, communicate it, and know when it's dangerous. At Pre-Seed, learning speed is the primary engineering metric. • Full-picture comfort: No hard lines between front end, back end, infra, and product. You go where the work is. • Ownership: You own the CI pipeline, the migration, the failing test, and the customer bug. There's no one to delegate to during the Pre-Seed stage. • Clear communication: You explain technical trade-offs in plain language and flag risks early. • You have built multi-tenant SaaS applications. • You have worked with Ionic, Angular, or the Capacitor/Cordova ecosystem. • You have designed AI workflows with human-in-the-loop review gates. • You have worked with CNN’s and Computer Vision. • You have built or contributed to developer tools, internal platforms, or infrastructure automation. • You have a strong appreciation for design and UX. • You understand UK construction compliance (MCS, Part P, Building Regulations).
Responsibilities
• Architecture ownership: Own the full technical stack including: Ionic Angular / React, FastAPI services, Supabase (Postgres, Auth, Storage), Cloudflare Workers, and LLM integrations. • Shipping software: Write, test, and deploy code. This is a hands on product role, not a management role. At Pre-Seed, the founding engineer is the engineering team. • AI/LLM integration: Ship LLM powered capabilities to augment installer workflows from surveying, scoping, quoting and documenting compliance. Train CNNs to recognise features. • Product collaboration: Work directly with installers and our customer success lead, hear what they need, and make the decisions that turn those needs into working software. Understand the trade well enough to make good judgment calls when the spec is ambiguous, and to push back when a requested feature would not actually solve the underlying problem. • Technical decision-making: Work with the team to choose tools, libraries, and patterns. Decide what to build, what to buy, and what to defer. Advise on technical hiring as the team grows.
Benefits
• As a founding technical lead, you will partner with the current Founder in Residence who has been developing this project as CEO over the last 12 months. The founder has 20+ years of product development experience in the construction industry, ML and Computer Vision. Most recently, he was responsible for an AI powered quality assurance system used by automotive OEMs, and before that built and scaled a robotic tool and installer operating system that delivered over 5,000 installs with zero compliance failures. • Contract: This role can begin as fractional (2–3 days per week) with a clear path to full-time, or start full-time from day one. We will discuss what works for both sides. Based in, or near Bristol or Exeter with regular co-located working in the South West. • Salary: Competitive for Pre-Seed stage, discussed openly during the process. • Equity: Significant early-stage equity. This is a founding-team role and the equity reflects that. • Autonomy: Real ownership of the tech stack and product direction. You will shape the company, not just work for it. • Mission: Direct, measurable impact on how independent tradespeople run their businesses and contribute to the UK’s net-zero transition. • Tools: Modern development and AI tools, a founder who has built and exited twice before, and a product roadmap shaped by over 100 installer interviews.
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