About this role
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: Germany / Europe
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
- Design and implement production-grade AI features and services.
- Work with LLMs, multimodal models, embeddings, RAG, agents, and AI APIs.
- Design AI workflows that are reliable, observable, and maintainable.
- Evaluate models and AI approaches against product requirements.
- Develop strategies for accuracy, hallucination reduction, latency, and cost optimization.
Product Development
- Work directly with the AI Product Manager to turn product requirements into technical solutions.
- Rapidly prototype new AI capabilities and validate technical feasibility.
- Take successful prototypes into production.
- Contribute to technical product decisions and architecture.
AI Infrastructure & Quality
- Build evaluation frameworks and testing approaches for AI systems.
- Implement monitoring and observability for AI applications.
- Establish appropriate guardrails and fallback mechanisms.
- Monitor model performance, latency, availability, and cost.
- Help establish reusable AI infrastructure and engineering patterns.
Cross-Functional Squad Execution
- Act as a senior technical contributor within the AI Product Squad.
- Collaborate with Product, Design, Backend, Full-Stack, and Automation specialists.
- Break complex AI initiatives into executable technical work.
- Mentor other engineers and raise engineering standards across the AI Team.
- Participate in architectural and technical decision-making.
Dein Profil
What We are Looking For
- 6+ years of professional software engineering experience.
- Significant experience building production software using TypeScript and/or Java Python.
- Hands-on experience building applications with LLMs or other modern AI technologies.
- Strong understanding of APIs, distributed systems, databases, and cloud infrastructure(AWS, GCP, or Azure).
- Experience taking AI prototypes into production.
- Strong software engineering fundamentals: testing, version control, code review, observability, and maintainability.
- Ability to operate autonomously in a fast-moving product environment.
- Experience with RAG architectures and vector databases.
- Experience building AI agents and tool-calling systems.
- Experience with model evaluation and AI observability.
- Experience with LangChain, LlamaIndex, or equivalent frameworks.
- Experience with multimodal AI.
- Experience building B2B SaaS products.
Success in the First 6–12 Months
- Deliver production-grade AI capabilities.
- Establish reliable AI engineering and evaluation patterns.
- Improve the quality, reliability, and cost efficiency of AI features.
- Build reusable AI components that accelerate future squads.
- 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?
- Impact: Shape the future of energy-efficient retrofits and make a real contribution to climate action.
- Growth: Be part of a fast-growing startup with huge market potential.
- Team & Culture: Work alongside a highly motivated, experienced team in Berlin (Kreuzberg). Enjoy a vibrant startup culture, regular team events, and a modern workplace.
- Innovation: Flat hierarchies and fast decision-making—your ideas matter from day one.
- Flexibility & Development: Competitive salary, flexible working hours, and tailored personal growth opportunities.
- 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).