Senior Full-Stack Software Engineer; m​/f​/d

Stellenbezeichnung: Senior Full-Stack Software Engineer (m/f/d) 1 KOMMA5°We are looking for you to join our tech team in Berlin, Munich, or Hamburg. 1 KOMMA5° is creating Germany's largest one-stop-shop for the sale, installation, and servicing of solar panels, heat pumps, electricity solutions, and charging infrastructure. And the best part? They are all interconnected! Become a part of our mission and learn more about our Product & Tech team!OverviewYou will help transform the business of selling renewable technologies h our core marketing automation and CRM platforms, we redefine growth processes to accelerate the global energy transition empowering private homes and small businesses to adopt sustainable energy solutions.As a Senior Software Engineer at 1 KOMMA5°, you will take technical ownership of key systems and features, driving architectural decisions and ensuring scalability, reliability, and performance. You’ll collaborate closely with other engineers, product managers, and stakeholders to shape our technical direction and deliver high-impact solutions. Beyond writing great code, you’ll mentor teammates, champion engineering excellence, and help evolve our development and deployment practices to the next level.Our Stack:Next.js/Type Script for frontend applications & NestJS/Type Script for backend applicationsInfrastructure as code, deployment to Google Cloud, observability with DatadogResponsibilitiesContribute as a senior full-stack engineer within a team of self-driven software developersDesign, build, and maintain business-critical systems across the stack. From scalable backend services to performant, user-friendly frontendsTranslate complex and loosely defined business problems into clear, actionable technical solutionsChampion clean architecture , component reusability, and maintainable UI patterns using modern frameworks (e.g. React, Next.js, or similar)Drive experiment-driven innovation and uphold strong engineering practices in testing, CI/CD, observability, and code qualityContinuously improve developer experience by reducing technical debt, automating workflows, and documenting key decisions and operational processesOperate effectively in an asynchronous, outcome-oriented environment , managing your work autonomously and maintaining clear communication through documentation and structured updatesContribute to lightweight project management by defining milestones, ensuring technical feasibility, and aligning engineering work with product goalsQualificationsExtensive experience writing maintainable, reusable, and testable code in Type Script , with strong skills in both frontend frameworks (e.g. React, Next.js) and backend technologies (e.g. Node.js, NestJS, or similar)Strong understanding of API design , data modeling, and system integration (RESTful or Graph QL)Proven ability to own features end-to-end , from UX and architecture to deployment and monitoringA pragmatic, product-focused mindset that balances technical excellence with delivering customer valueCuriosity and initiative to explore new tools and methods that improve product quality and engineering efficiencyExcellent written and spoken English ; German is a plusResidency in GermanyBenefitsYou are part of an international, dynamic, and highly motivated team of people who have proven to make things happenWith your work, you accelerate the "energy transition" and hence have a direct impact on our climateWork with and learn from other super-smart colleaguesYou will enjoy direct contact with core decision-makersYou will enjoy the best chances of entering full-time in one of Europe’s most thriving scaleupsYou work remotely (Germany-wide), with offices in Hamburg, Berlin or MunichCreate a healthy balance alongside your work and enjoy all the benefits of the EGYM WellpassBenefits and discounts are yours with FuturebensWhether city bike or e-bike - be flexible with our job bike leasing and do something good for the environment at the same time#J-18808-Ljbffr