1KOMMA5°

Full-stack Engineer

• Build and optimize backend services for VPP operations and energy market integrations
• Design systems at the intersection of backend and data processing pipelines
• Drive technical decisions and guide fellow engineers on architectural choices
• Navigate between data engineering, backend engineering, and energy market domains
• Collaborate with product managers, data engineers, and data scientists across team boundaries

Senior Software Engineer – Energy Markets

Bookkeeper

• Gestaltung des gesamten Rechnungswesens der Gruppe gemeinsam mit der VP Accounting und dem Team
• Selbständige Betreuung unserer Partner
• Sicherstellung einer zeitgerechten Verbuchung und Verarbeitung des Tagesgeschäfts (Debitoren- und Kreditorenrechnungen, Bank, Abgrenzungen)
• Überprüfung von Rechnungen sowie Zahlungsvorgängen
• Mitwirkung bei der Erstellung von Monats-, Quartals- und Jahresabschlüssen sowie Erstellung von Soll-Ist-Vergleichen und deren Auswertung

Buchhalter, m/w/d

Data Analyst

• Support the Controlling and Business Intelligence teams in building a centralized data architecture
• Build and maintain end-to-end data pipelines to ensure availability of operational and financial data
• Support the Controlling team with automated reports, forecast datasets, and KPI tracking
• Independently develop analyses, dashboards, and reports in Looker to monitor financial and operational performance
• Contribute to ensuring data integrity and reliability in finance-related datasets
• Assist in automating and optimizing reporting processes for budgeting, forecasting, and variance analysis
• Research and implement AI-powered data analysis to improve forecasts, anomaly detection, and business insights

Working Student – Data Analytics, Controlling Focus

• Architect the financial engines that power the global energy transition
• Build payment lifecycles and seamless checkout experiences
• Process transactions and build trust and infrastructure for renewable technology
• Take technical ownership of key systems and features, driving architectural decisions
• Collaborate with engineers, product managers, and stakeholders
• Mentor teammates and champion engineering excellence
• Evolve development and deployment practices

Senior Full-Stack Software Engineer – Payments

Conversion Rate Optimizer

• Strategic optimization: You will be responsible for continuously increasing the conversion rate across the entire funnel — from the first click on the landing page to the qualified lead inquiry
• Hypothesis-driven testing: You will design, prioritize, and manage systematic A/B and multivariate tests to remove user friction and continuously improve lead quality
• User experience & journey: In close collaboration with our website team, you will optimize landing pages and funnel logic to create a best-in-class user experience
• Data-driven insights: You will use tools such as Google Analytics and Hotjar to analyze user behavior in depth and derive data-backed recommendations to improve web performance
• Stakeholder coordination: You will work closely with Performance Marketing to ensure that ad creatives and landing page experiences are perfectly aligned to sustainably reduce Customer Acquisition Cost (CAC)
• Innovation & trends: You will monitor trends in CRO and AI and translate them into concrete growth levers for 1KOMMA5°

Conversion Rate Optimization Manager

Backend Engineer

• Entwicklung und Wartung der Kern-Rails-Anwendung mit Fokus auf Code-Gesundheit, moderne Patterns und langfristige Stabilität
• Technische Umsetzung komplexer Projekte in 6-Wochen-Zyklen leiten und Verantwortung vom Architektur-Design bis zum Versand übernehmen
• Pragatische Verbindungen zwischen dem Rails-Monolithen und Satelliten-Typescript/GCP-Services (Pub/Sub, Cloud Functions) aufbauen, ohne überzuregagieren
• Proaktiv Friktionen in Werkzeugen, CI/CD und lokalen Umgebungen identifizieren und beheben, um sicherzustellen, dass der Code-Basis eine angenehme Arbeitsumgebung bleibt
• Hohe Standards durch klare Dokumentation, architektonische Entscheidungsunterlagen (ADRs oder RFCs) und umfassende Code-Reviews fördern

Senior Fullstack Software Engineer – Ruby/Typescript

Business Analyst

• You analyze operational metrics and drive data-driven improvements in the installation business
• You develop a deep understanding of our ongoing installation and site processes
• You identify, measure and prioritize optimization opportunities
• You combine data from different sources and derive clear, actionable recommendations
• You work closely with foremen, site managers and central teams, building collaborative, peer-level working relationships
• You travel 1–2 times per month within Germany and Europe to understand on-site processes and implement improvements

Recruitment

• You enthuse candidates with your personal approach and spark interest in 1KOMMA5° and our mission
• You are part of the Talent Management team and assist with reviewing application documents and pre-selecting profiles, with a focus on Tech & Product roles
• After a successful onboarding, you will conduct initial interviews and help fill essential positions
• You take ownership of positions end-to-end — from posting job ads and direct sourcing to extending contract offers
• You collaborate with experienced hiring managers as an equal partner and act as one of the main contacts for Tech & Product hiring
• You own the candidate journey by managing communication with applicants, providing timely feedback, answering questions, and scheduling interviews
• You support the optimization of our processes and are responsible for your own projects

Working Student Recruiting

Operations

• You lead strategic projects and programs to rapidly and sustainably improve efficiency and quality across our operational units
• You work closely with local trade contractors and installation partners to optimize on-site operational performance
• When required, you take on interim site leadership, stabilize the organization, and establish a sustainable leadership structure
• You actively develop the operations strategy through operational programs
• You regularly travel across Germany and Europe (up to 3–4 days per week) to understand and improve processes on-site

Operations Manager

Account Manager

• Responsible for submitting applications and the ongoing management of primary and guest concession agreements
• Identify relevant contacts at distribution system operators (DSOs) and build strategic partnerships
• Lead strategic projects and develop solutions for process-related issues
• Manage escalations from distribution system operators and negotiate viable compromises and solutions