Application Guide

How to Apply for Co-Founder, CTO, Construction Operations

at Marble

🏢 About Marble

Marble is an innovative venture focused on slashing emissions and cooling the planet through deeptech climate solutions. They are building an AI-native operating system for construction micro-businesses, aiming to transform a traditionally low-tech industry. If you want to apply cutting-edge AI to real-world climate impact, Marble offers a unique mission-driven environment.

About This Role

As Co-Founder and CTO, you will own the technical vision and architecture for an AI-powered OS targeting construction micro-businesses. You'll write production code across the full stack, build and lead the engineering team, and drive technical narratives for fundraising. This role is impactful because you'll shape both the product and the company from the ground up, directly contributing to decarbonizing construction.

💡 A Day in the Life

Your day might start with a standup with the engineering team, reviewing PRs and discussing AI agent performance. Mid-morning, you'll jump into code, perhaps building a new data pipeline or debugging a cloud deployment. Afternoons could involve a call with potential investors about technical strategy, followed by a user research session with a construction contractor to understand their workflow pain points. You'll end the day by planning the next sprint and reviewing architecture decisions.

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Interview Prep

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🎯 Who Marble Is Looking For

  • You have a strong software engineering background with experience shipping multi-tenant SaaS and production systems end-to-end, ideally in a startup context.
  • You are an expert in Python backend development (APIs, data pipelines) and production AI (RAG, structured output, evaluation), and you're comfortable deploying on cloud infrastructure like Supabase, Cloudflare, or AWS.
  • You are outcome-driven, thrive in ambiguity, and can communicate technical vision to both investors and tradespeople without jargon.
  • You have experience hiring and leading engineering teams, setting culture, and defining technical strategy in a fast-paced environment.

📝 Tips for Applying to Marble

1

Highlight specific projects where you built and deployed AI agent workflows or multi-tenant SaaS systems end-to-end, including metrics on performance or impact.

2

Showcase your experience with Python backend and cloud infrastructure (mention Supabase, Cloudflare, or AWS explicitly) and how you've used them in production.

3

Demonstrate your ability to communicate with non-technical stakeholders by including examples of how you explained technical concepts to investors or end-users.

4

Emphasize any experience in construction or climate tech, even if tangential, to show domain interest.

5

Include a brief paragraph on your vision for how AI can transform construction micro-businesses, referencing Marble's mission.

✉️ What to Emphasize in Your Cover Letter

['Your passion for climate impact and how this role aligns with your personal mission to reduce emissions.', 'Your experience building and leading engineering teams from scratch, including hiring and culture-setting.', 'Concrete examples of shipping production AI systems (e.g., RAG, structured output) and their business outcomes.', 'Your ability to balance technical depth with strategic thinking, especially in a co-founder capacity.']

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Read about Marble's specific climate impact goals and how they measure emissions reduction.
  • → Understand the construction micro-business landscape: common pain points, tech adoption levels, and competitors.
  • → Familiarize yourself with AI agent frameworks like LangChain, LlamaIndex, or similar, and how they apply to operational workflows.
  • → Look into Marble's funding history and investor base to understand their growth stage and expectations.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 How would you design an AI-native OS for construction micro-businesses? Walk through architecture, data pipelines, and agent workflows.
2 Describe a time you had to communicate a complex technical strategy to non-technical investors. How did you tailor your message?
3 How do you approach hiring for a startup? What qualities do you look for in early engineers, and how do you set engineering culture?
4 What are the key technical risks in building a multi-tenant SaaS for small construction businesses, and how would you mitigate them?
5 How would you evaluate the success of an AI agent in production? What metrics and evaluation frameworks would you use?
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⚠️ Common Mistakes to Avoid

  • Focusing too much on theoretical AI without showing production experience or understanding of deployment challenges.
  • Underestimating the importance of communicating with non-technical stakeholders (tradespeople, investors) – avoid jargon-heavy responses.
  • Not demonstrating a founder mindset: be prepared to discuss trade-offs between speed, quality, and resource constraints.

📅 Application Timeline

This position is open until filled. However, we recommend applying as soon as possible as roles at mission-driven organizations tend to fill quickly.

Typical hiring timeline:

1

Application Review

1-2 weeks

2

Initial Screening

Phone call or written assessment

3

Interviews

1-2 rounds, usually virtual

✓

Offer

Congratulations!

Ready to Apply?

Good luck with your application to Marble!

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