Senior Full-Stack Software Engineer – Financial Infrastructure, Payments

This is a fully remote position, open to applicants in Germany.

📋 Description

• You will design the billing, invoicing, and monetization systems that support the global energy transition — creating a cohesive internal platform.

• By developing and managing everything from invoicing and subscriptions to PSP-supported payments and reconciliations, you will ensure that sustainable energy is both financially viable and operationally scalable.

• The audit trails, templates, and integrations you create will be relied upon by finance teams and customers as we grow into new markets.

• As a software engineer at 1KOMMA5°, you will assume technical ownership of essential systems and features, influence architectural decisions, and guarantee scalability, reliability, and performance.

• You will collaborate closely with fellow engineers, product managers, and stakeholders to define our technical direction and deliver impactful solutions.

• In addition to building solutions, you will mentor team members, promote engineering excellence, and help elevate our development and deployment practices.

⛳️ Requirements

• Proficient in writing maintainable, reusable, and testable code in TypeScript, with strong expertise in both frontend frameworks and backend technologies.

• Solid understanding of API design, data modeling, and system integration (RESTful or GraphQL), including patterns for idempotent money movements and auditable billing events wherever applicable.

• Demonstrated ability to manage features from conception to completion, encompassing UX and architecture through deployment and monitoring.

• A practical, product-oriented mindset that balances technical excellence with delivering customer value in regulated or finance-related operations.

• A proactive attitude and curiosity to explore new tools and techniques that enhance product quality and engineering efficiency.

• Exceptional written and spoken English (German is an advantage).

• Must reside in Germany.

🏝️ Benefits

• You will be part of an international, dynamic, and highly motivated team.

• Your efforts will help accelerate the energy transition and directly impact the climate.

• You will collaborate with and learn from other highly talented colleagues.

• You will have direct access to decision-makers.

• Join one of Europe’s fastest-growing scale-ups in a full-time position.

• Enjoy the flexibility of working remotely (across Germany), with office locations in Hamburg, Berlin, or Munich.

• Maintain a healthy work-life balance and benefit from all features of EGYM Wellpass.

• Access benefits and discounts through Futurebens.

• Enjoy flexibility with our company bike leasing and contribute positively to the environment at the same time.