Deine Mission
About Wallround
Wallround is headquartered in Berlin, with additional locations in Hamburg, Frankfurt am Main, Munich, Friedrichshafen and NRW. Our mission: we turn energy-efficient retrofits for multi-family residential buildings into predictable, lucrative investment opportunities. When it comes to modernisations, the real estate market is often a black box of rough estimates and fragmented processes. We are changing that. Through our integrated platform and streamlined workflow, we transform 'brown assets' into future-proof, high-yield properties.
About the Role
Department: Prod & Tech Functional Home: AI Reports to: CPO Location: Berlin, office-first
Seniority: Senior
We are looking for AI Senior Software Engineers to design and build the technical foundation behind our AI-powered products.
You will be part of the AI Functional Home while working primarily within cross-functional product squads. You will collaborate closely with the AI Lead Product Manager, Product Design, Full-Stack and Backend Engineers, and Automation Engineers.
This role is ideal for an engineer who enjoys moving between AI experimentation and production software engineering - taking an idea from prototype to reliable, scalable customer-facing functionality.
Key Responsibilities
AI Engineering
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Design and implement production-grade AI features and services.
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Work with LLMs, multimodal models, embeddings, RAG, agents, and AI APIs.
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Design AI workflows that are reliable, observable, and maintainable.
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Evaluate models and AI approaches against product requirements.
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Develop strategies for accuracy, hallucination reduction, latency, and cost optimization.
Product Development
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Work directly with the AI Product Manager to turn product requirements into technical solutions.
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Rapidly prototype new AI capabilities and validate technical feasibility.
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Take successful prototypes into production.
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Contribute to technical product decisions and architecture.
AI Infrastructure & Quality
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Build evaluation frameworks and testing approaches for AI systems.
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Implement monitoring and observability for AI applications.
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Establish appropriate guardrails and fallback mechanisms.
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Monitor model performance, latency, availability, and cost.
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Help establish reusable AI infrastructure and engineering patterns.
Cross-Functional Squad Execution
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Act as a senior technical contributor within the AI Product Squad.
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Collaborate with Product, Design, Backend, Full-Stack, and Automation specialists.
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Break complex AI initiatives into executable technical work.
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Mentor other engineers and raise engineering standards across the AI Team.
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Participate in architectural and technical decision-making.
Dein Profil
What We are Looking For
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6+ years of professional software engineering experience.
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Significant experience building production software using TypeScript and/or Java Python.
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Hands-on experience building applications with LLMs or other modern AI technologies.
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Strong understanding of APIs, distributed systems, databases, and cloud infrastructure(AWS, GCP, or Azure).
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Experience taking AI prototypes into production.
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Strong software engineering fundamentals: testing, version control, code review, observability, and maintainability.
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Ability to operate autonomously in a fast-moving product environment.
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Experience with RAG architectures and vector databases.
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Experience building AI agents and tool-calling systems.
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Experience with model evaluation and AI observability.
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Experience with LangChain, LlamaIndex, or equivalent frameworks.
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Experience with multimodal AI.
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Experience building B2B SaaS products.
Success in the First 6–12 Months
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Deliver production-grade AI capabilities.
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Establish reliable AI engineering and evaluation patterns.
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Improve the quality, reliability, and cost efficiency of AI features.
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Build reusable AI components that accelerate future squads.
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Mentor engineers and contribute to the technical direction of the AI Team.
What You’ll Own
AI Architecture → AI Engineering → Production AI Systems → Evaluation → Reliability → Technical Excellence
Warum wir?
Why Join Wallround?
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Impact: Shape the future of energy-efficient retrofits and make a real contribution to climate action.
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Growth: Be part of a fast-growing startup with huge market potential.
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Team & Culture: Work alongside a highly motivated, experienced team in Berlin (Kreuzberg). Enjoy a vibrant startup culture, regular team events, and a modern workplace.
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Innovation: Flat hierarchies and fast decision-making—your ideas matter from day one.
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Flexibility & Development: Competitive salary, flexible working hours, and tailored personal growth opportunities.
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Perks & Benefits: €150 monthly benefit budget—use it for public transit tickets, meal allowances, or lifestyle perks (e.g., Urban Sports Club membership or vendor vouchers).
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