Backend Engineer (Mid-Level)

About the Role

Join the core infrastructure team at an early-stage energy technology company, building the backend systems behind dynamic electricity plans and reliable billing. You will help develop scalable services for billing and energy-market communication.

What You'll Do

• Design backend systems that reduce complexity in billing and energy-market workflows.

• Scale core infrastructure to support growing transaction volumes and market demands.

• Ship features and improvements through rapid iteration and practical engineering decisions.

• Raise technical standards through code reviews, architecture decisions, and mentorship.

What We're Looking For

• At least 3 years of hands-on experience building and shipping reliable backend systems in production.

• Strong TypeScript and Node.js skills, including asynchronous programming.

• Experience with PostgreSQL and ORM-based data access, such as Drizzle or similar tools.

• Experience building Next.js backend services, including API routes or server components.

• Familiarity with distributed systems and designing scalable, maintainable services.

• Experience integrating Stripe payments and billing workflows.

• Strong computer science fundamentals through formal education or equivalent practical experience.

• Fluent or native-level German proficiency, C1 or higher.

• Interest in early-stage environments, an ownership mindset, and evidence of strong technical ability through projects, research, competition, or founding work.

• Broad application-building experience and clear written and verbal communication skills.

Compensation & Benefits

Annual salary of €80,000 to €120,000. Visa sponsorship is available.

Location

On-site in Berlin, Germany, five days per week.