Application Guide

How to Apply for Senior Full-Stack Software Engineer (m/f/d)

at 1KOMMA5°

🏢 About 1KOMMA5°

1KOMMA5° is pioneering holistic CO2-neutral building solutions by integrating decentralized clean energy, mobility, and heat supply. This unique approach combines sustainability with scalable technology to transform how renewable technologies are deployed at a residential and commercial level. Working here means contributing directly to Germany's energy transition while building cutting-edge software systems.

About This Role

As a Senior Full-Stack Engineer, you'll own key systems within marketing automation and CRM platforms that enable scaling renewable technology sales. You'll drive architectural decisions for features that directly impact business growth while mentoring teammates and evolving development practices. This role is impactful because your technical leadership will help accelerate the adoption of clean energy solutions across Germany.

💡 A Day in the Life

You might start with a standup discussing progress on CRM platform features, then spend the morning pair-programming on a React component with a teammate. After lunch, you'd review architectural decisions for a new marketing automation integration, followed by mentoring a junior engineer on testing practices. The day ends with planning sessions to align technical direction with product goals for scaling renewable technology sales.

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Interview Prep

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🎯 Who 1KOMMA5° Is Looking For

  • Has extensive TypeScript experience with production-level React/Next.js frontends and Node.js/NestJS backends, demonstrated through complex projects
  • Can articulate clear API design decisions (RESTful vs GraphQL) and data modeling approaches for scalable systems
  • Shows ownership mentality with examples of taking features from UX design through deployment and monitoring
  • Communicates technical concepts clearly in English and understands German business context (though German proficiency isn't strictly required)

📝 Tips for Applying to 1KOMMA5°

1

Highlight specific TypeScript/React/Node.js projects where you improved scalability or performance for business-critical systems

2

Demonstrate understanding of marketing automation or CRM platforms - even if indirectly through e-commerce or SaaS experience

3

Show how you've mentored engineers or improved development practices in remote settings

4

Connect your experience to sustainability or energy transition projects if possible

5

Prepare concrete examples of architectural decisions you've made for systems requiring high reliability

✉️ What to Emphasize in Your Cover Letter

['Your experience with TypeScript across full-stack development and specific contributions to scalable systems', 'Examples of owning features end-to-end, particularly in business automation or platform contexts', "Why you're motivated by 1KOMMA5°'s mission of CO2-neutral buildings and decentralized energy", "How you've mentored teammates or championed engineering excellence in previous roles"]

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → 1KOMMA5°'s specific products like their energy management systems or heat pump solutions
  • → Germany's energy transition policies and how they affect decentralized energy solutions
  • → The company's recent news or funding rounds to understand growth trajectory
  • → Competitors in the German renewable technology and smart home space

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Architecting a scalable marketing automation feature using React/Next.js frontend and NestJS backend
2 Trade-offs between RESTful and GraphQL APIs for CRM platform integrations
3 Monitoring and reliability strategies for business-critical systems in renewable technology sales
4 Approach to mentoring junior engineers in a remote, German business context
5 How you'd improve development/deployment practices for a team scaling renewable technology platforms
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⚠️ Common Mistakes to Avoid

  • Focusing only on technical skills without showing understanding of business impact in renewable energy
  • Presenting generic full-stack experience without highlighting TypeScript/React/Node.js specificity
  • Failing to demonstrate ownership mentality or examples of end-to-end feature development

📅 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 1KOMMA5°!

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