Senior Software Engineer (Y Combinator Startup)

CoCrafter; München; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Strong network

Equity (ESOP)

28 days vacation

WellPass

Team events

Munich office

Job summary

CoCrafter in Munich is seeking a Senior Software Engineer (m/f/d) to scale the OS for subcontractor management. You will own system architecture and help shape technical direction while staying hands-on with feature work.

You will collaborate with the CTO, drive CI/CD, performance optimization, and ADRs, mentoring the team and shipping robust software built with NestJS, PostgreSQL, Next.js, Docker and AWS. German or English communication is required; you will work in a fast-growing startup

Qualifications

• Degree in Computer Science or related field.
• Experience guiding a product/system through a growth phase.
• Hands-on senior engineer who builds features and delivers pragmatic solutions.
• Several years of backend engineering with TS/Node.js stack.
• Strong knowledge of databases, cloud infra, CI/CD, observability.
• Excellent German or English (German a plus).

Responsibilities

• Evolve system architecture and optimize performance for enterprise requirements.
• Build and improve CI/CD pipelines and testing strategy.
• Stay hands-on and develop features wherever needed.
• Define technical standards for observability, security, and code quality.
• Mentor team through code reviews, pairing, ADRs, and knowledge sharing.
• Prepare and document technical decisions with trade-offs.

Skills

Backend engineering

TypeScript/Node.js

Code reviews

Mentoring

CI/CD

Observability

Performance optimization

System architecture

German/English

Education

Degree in Computer Science

Tools

NestJS

PostgreSQL

Next.js

Docker

AWS

Job description

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!