Application Guide

How to Apply for Backend Developer Payment (m/w/d) – Remote deutschlandweit

at ES-Tec

🏢 About ES-Tec

ES-Tec is at the forefront of eco-friendly mobility, developing innovative comfort electronics and driver assistance technologies that make electric vehicles smarter and more sustainable. Working here means contributing to a greener future while tackling challenging technical problems in a dynamic, remote-first environment across Germany.

About This Role

As a Backend Developer Payment, you will design and operate scalable C# backend systems, with a primary focus on integrating Stripe for payment processing and automating billing workflows. Your work directly impacts the reliability and scalability of payment infrastructure that supports the growing e-mobility ecosystem.

💡 A Day in the Life

Your day might start with a stand-up on Slack, then diving into C# code to implement a new Stripe webhook handler for failed payments. After lunch, you'd collaborate with the product team on billing logic for a new charging tariff, followed by reviewing pull requests and monitoring payment system performance in production.

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🎯 Who ES-Tec Is Looking For

  • Has a degree in computer science, electrical engineering, energy technology, or equivalent, with strong C# skills and backend development experience.
  • Possesses hands-on experience with Stripe API, including building payment flows, webhooks, and handling idempotency.
  • Understands distributed systems, RESTful APIs, and data integration, ideally within the e-mobility domain.
  • Is comfortable working autonomously in a remote setting and communicates effectively in German (company language).

📝 Tips for Applying to ES-Tec

1

Tailor your resume to highlight specific Stripe integration projects, including details like payment methods, recurring billing, or webhook error handling.

2

Include a brief section on your experience with e-mobility or related fields (e.g., charging infrastructure, energy systems) to show domain relevance.

3

Write a cover letter that explicitly mentions your familiarity with German billing regulations (e.g., VAT, invoicing) and how you've applied them.

4

Prepare a small portfolio or GitHub link with C# backend projects, especially those involving payment processing or microservices.

5

Mention your remote work setup and tools you use for collaboration (e.g., Slack, Jira, Git) to demonstrate readiness for distributed teamwork.

✉️ What to Emphasize in Your Cover Letter

['Emphasize your C# backend expertise and specific experience with Stripe, including challenges like handling failed payments or scaling payment systems.', "Show enthusiasm for eco-mobility and how your technical skills can contribute to ES-Tec's mission of driving sustainable transportation.", 'Highlight your ability to design automated billing workflows and integrate with existing accounting systems, as per the job description.', 'Demonstrate your understanding of German market requirements for payment systems, such as GDPR compliance and SEPA direct debits.']

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Explore ES-Tec's product portfolio, especially their comfort electronics and driver assistance systems for e-mobility.
  • → Read about their approach to sustainability and how they integrate payment systems into the EV charging experience.
  • → Check their engineering blog or tech stack mentions (e.g., Azure, Kubernetes) to understand their backend infrastructure.
  • → Look up recent news or press releases about ES-Tec to understand their market position and growth areas.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Walk us through a Stripe integration you've done: how did you handle webhooks, idempotency, and error scenarios?
2 How would you design a scalable billing system that handles millions of transactions for EV charging sessions?
3 Explain your experience with C# async/await, dependency injection, and message queues in a distributed system.
4 What challenges have you faced with payment reconciliation, and how did you automate the process?
5 How do you ensure data security and compliance with German regulations (e.g., BaFin, GDPR) in payment systems?
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⚠️ Common Mistakes to Avoid

  • Don't apply without demonstrating concrete Stripe experience; generic payment knowledge won't suffice.
  • Avoid a generic cover letter—ensure it references e-mobility and specific technical challenges mentioned in the job description.
  • Don't neglect to show German language proficiency; the role is remote within Germany and requires communication in German.

📅 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 ES-Tec!

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