CoCrafter (YC W24)

Senior Software Engineer (Y Combinator Startup)

Munich, Germany full-time Mid Salary not listed
full-time Mid level Technology & IT Curated
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About the role

We are CoCrafter (YC W24), a fast-growing Munich-based startup on a mission to fundamentally transform core processes in the construction industry.
The construction industry is the backbone of the German and European economy – yet it has largely been overlooked by digitalization. The result? Inefficient processes and significant untapped potential.
At CoCrafter, we are building the Operating System (OS) for subcontractor management and already serve numerous medium-sized construction companies and trade businesses across Germany.
We have raised €1.8 million from Y Combinator, 10x Founders, and other top-tier investors – and are ready to take the next big step in our growth journey.
Join our team and help us shape the future of the construction industry! 🚀
The Role
We are a small, high-performing engineering team that is growing rapidly. As a Senior Software Engineer (m/f/d), you will ensure that our system architecture and engineering processes scale alongside the business – from our early-stage startup setup to enterprise-level requirements.
At the same time, you will remain hands-on: You will actively contribute to feature development wherever needed and lead by example. You will work closely with our CTO and have real ownership and influence over our technical direction.
Responsibilities
Evolve our system architecture and optimize performance to handle 10x growth in load and meet enterprise requirements

Build and improve CI/CD pipelines, automated deployments, and a testing strategy that enables the team to ship quickly and reliably

Stay hands-on and develop features wherever the team needs support

Define technical standards for observability, security, and code quality

Help the team grow through code reviews, pair programming, Architecture Decision Records (ADRs), and mentoring

Prepare and document technical decisions, clearly outlining trade-offs and implications

Qualification
A degree in Computer Science or a related field

Experience guiding a product or system through a significant growth phase

You are a strong Senior Engineer who enjoys building features hands-on and delivering pragmatic solutions

Several years of backend engineering experience, ideally with TypeScript/Node.js (our stack: NestJS, PostgreSQL, Next.js, Docker, AWS)

Strong knowledge of databases, performance optimization, cloud infrastructure, CI/CD, and observability

You think in terms of trade-offs and take ownership beyond the scope of your individual tickets

Excellent German or English skills. German is a plus

Benefits
An outstanding network of founders, investors, and mentors to support your personal and professional growth

Competitive compensation, including equity (ESOP) – share in our success

28 days of paid vacation per year to recharge

WellPass to help you stay active or unwind outside the office

Team events including bowling, mini golf, offsites, and regular feedback sessions

A beautiful office in the heart of Munich (Maxvorstadt)

Why You Should Join CoCrafter
Impact: In less than a year, we have built a product that has become essential to our customers. With your work, you will help redefine an entire industry

Growth: Joining an early-stage startup is a unique opportunity. Become part of a fast-growing team and take on a key role in shaping its future!

Team: We are an interdisciplinary, dynamic, and supportive team passionate about building something extraordinary. Join CoCrafter and grow both personally and professionally!

🚀 Let’s build the future of construction together!
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Interview prep

Walk in with sharper answers.

Use this as a quick practice sheet before you speak with the employer.

Mid
Technology & IT Javascript MySQL Senior Software Engineer Mid level

Likely questions

  1. Tell us about work you have done that is close to the Senior Software Engineer (Y Combinator Startup) role.
  2. How would you approach your first 30 days at CoCrafter (YC W24)?
  3. Which of Javascript, MySQL and Senior have you used recently, and what did it help you achieve?
  4. Describe a time you solved a problem without waiting to be told exactly what to do.
  5. How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

  • A recent example that proves your experience with Javascript, MySQL and Senior.
  • One short story with a problem, your action, and the result.
  • Two examples that show the strengths listed on your CV.
  • A clear reason why this role and company interest you.
  • Your availability, preferred work style, and salary expectations.

Ask them

  • What would success look like in the first 90 days?
  • What are the main problems this hire should help solve?
  • How does the team give feedback and measure good work?
  • What does a normal working week look like for this role?
Practice line

I am interested in the Senior Software Engineer (Y Combinator Startup) role because I can bring practical experience in Javascript, MySQL and Senior, learn the team quickly, and contribute to the outcomes CoCrafter (YC W24) needs from this hire.

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