Senior Full-Stack Software Engineer – Financial Infrastructure, Payments

1KOMMA5°

Software Engineer architecting billing, invoicing, and monetization systems for sustainable energy at 1KOMMA5°. Collaborating with cross-functional teams to ensure scalability and performance.

Posted 6/15/2026full-timeRemote • 🇩🇪 GermanySeniorWebsite

Tech Stack

Tools & technologies

GraphQLTypeScript

About the role

Key responsibilities & impact

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

What you’ll need

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

Comp & perks

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.

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Hard Skills & Tools

TypeScriptAPI designdata modelingsystem integrationRESTfulGraphQLfrontend frameworksbackend technologiesscalabilityreliability

Soft Skills

mentoringengineering excellencecuriosityinitiativeproduct-focused approachcommunicationcollaborationproblem-solvingcustomer valuetechnical ownership