Backend Engineer (Mid-Level)

About the Role Join a core infrastructure team at an energy technology company building software for dynamic electricity plans. You will develop backend systems for billing, energy-market communications, and accounting, helping make these services reliable and scalable. What You'll Do Design backend systems that address complex billing and energy-service requirements. Build and scale core services that support dynamic electricity plans and reliable billing. Develop and maintain backend data access and service logic. Contribute hands-on to production code and ship improvements with ownership. Help raise the quality and maintainability of core infrastructure. What We're Looking For At least 3 years of experience building reliable backend infrastructure. Proficiency with TypeScript and Node.js, including asynchronous programming. Experience with PostgreSQL and ORM-based data access. Experience building backend services with Next.js, including API routes or server components. Familiarity with distributed-systems concepts and scalable, maintainable service design. Experience integrating Stripe payments and billing flows. Strong computer science fundamentals through a degree or equivalent practical experience, plus evidence of exceptional technical work. Broad application-building experience and a hands-on record of recent production coding and shipping. Fluent German at C1 level or higher, with strong written and verbal communication skills. Compensation & Benefits Annual salary range: €80,000 to €120,000. Visa sponsorship is available. Location On-site, five days per week in Berlin, Germany.