Senior Full-Stack Software Engineer – Financial Infrastructure, Payments

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1KOMMA5°

WebsiteLinkedInAll Job Openings

1001 - 5000 employees

Founded 2021

⚡ Energy

☁️ SaaS

🔧 Hardware

Energy • SaaS • Hardware

1KOMMA5° is a company dedicated to providing sustainable energy solutions through the installation and management of solar panels, heat pumps, energy storage systems, and energy management technologies. Their Heartbeat AI and Dynamic Pulse technologies intelligently connect and optimize users' energy systems, allowing for significant savings in energy costs. The company emphasizes independence from traditional energy markets by enabling households to produce and manage their own clean energy. With a focus on sustainability, 1KOMMA5° also facilitates the sale of surplus solar energy, helping users earn additional income. They operate comprehensively, offering consultation, planning, installation, and service through their extensive network across multiple countries.

📋 Description

• You will architect the billing, invoicing, and monetization systems behind the global energy transition — a unified internal platform. • By designing and operating everything from invoicing and subscriptions to PSP-supported payments and reconciliations, you make sustainable energy financially sound and operationally scalable. • The audit trails, templates, and integrations you build are what finance teams and customers rely on as we expand across markets. • As a software engineer at 1KOMMA5°, you will take technical ownership of key systems and features, drive architectural decisions, and ensure scalability, reliability, and performance. • You will work closely with other engineers, product managers, and stakeholders to shape our technical direction and deliver high-impact solutions. • Beyond building solutions, you will mentor teammates, foster engineering excellence, and help take our development and deployment practices to the next level.

🎯 Requirements

• Experience writing maintainable, reusable, and testable code in TypeScript, with strong skills in both frontend frameworks and backend technologies. • Strong understanding of API design, data modeling, and system integration (RESTful or GraphQL), including patterns for idempotent money movements and auditable billing events where relevant. • Proven ability to take features end-to-end, from UX and architecture through deployment and monitoring. • A pragmatic, product-focused approach that balances technical excellence with delivering customer value for regulated or finance-adjacent operations. • Curiosity and initiative to explore new tools and methods that improve product quality and engineering efficiency. • Excellent written and spoken English (German is a plus). • Residence in Germany.

🏖️ Benefits

• You will be part of an international, dynamic, and highly motivated team. • Your work accelerates the energy transition and has a direct impact on the climate. • You will work with and learn from other highly talented colleagues. • You have direct access to decision-makers. • You join one of Europe’s fastest-growing scale-ups full-time. • You work remotely (Germany-wide), with offices in Hamburg, Berlin, or Munich. • Maintain a healthy work-life balance and enjoy all benefits of EGYM Wellpass. • Benefits and discounts through Futurebens. • Be flexible with our company bike leasing and do something good for the environment at the same time.