AI Engineer in London

At Aspect, we are one of London’s largest property maintenance teams, covering more trades than anyone else and operating 24/7. After more than 15 years of trusted service to thousands of residential and commercial customers, we are entering an exciting phase of rapid digital transformation. We are investing heavily in AI and automation to reimagine how we deliver customer service, field operations, and internal workflows.

We are now looking for a motivated Junior AI Engineer with hands-on experience in voice AI, retrieval-augmented generation, and agentic systems to join our growing AI team and help build scalable, production-grade intelligent systems.

The Role

As a Junior AI Engineer, you will work alongside our senior AI team to design, develop, and deploy voice-enabled AI systems and agentic applications that directly impact how we serve thousands of customers and coordinate field engineers across London. You will gain deep exposure to production AI systems while contributing meaningfully from day one. This is a hands-on engineering role with real ownership: you will build, test, and ship AI features into live products used daily across our operations.

You Will

• Build and maintain production voice AI agents using platforms such as Retell AI, LiveKit Agents, or similar, ensuring they are scalable, reliable, and optimised for real-world call volumes.
• Develop and optimise Retrieval-Augmented Generation (RAG) pipelines to power knowledge-driven conversations and automate specialist tasks across property maintenance workflows.
• Implement and iterate on multi-agent architectures (e.g., LangGraph, CrewAI, AutoGen) to coordinate complex, multi-step workflows and automate operational processes.
• Fine-tune large language models (LLMs) for domain-specific tasks including call classification, intent detection, and specialised property maintenance knowledge.
• Integrate AI systems with platforms such as Salesforce and internal tools to ensure seamless data flow and operational alignment.
• Design scalable voice agent architectures capable of handling high call volumes with low latency and high accuracy.
• Collaborate with Product, Operations, and Customer Service teams to identify AI use cases and translate requirements into working solutions.
• Monitor, evaluate, and improve deployed AI systems using metrics, logging, and feedback loops to ensure continuous performance improvement.
• Contribute to responsible AI development with attention to fairness, data privacy, and security best practices.

Required Skills & Experience

• 1–3 years of experience in AI/ML engineering, with demonstrable work in Generative AI and NLP.
• Strong Python programming skills; familiarity with libraries such as NumPy, Pandas, scikit-learn, and at least one deep learning framework (PyTorch or TensorFlow).
• Hands-on experience building or working with voice AI agents (e.g., Retell AI, LiveKit Agents, Twilio Voice, or similar telephony/voice platforms).
• Practical experience implementing RAG pipelines using frameworks like LangChain, LlamaIndex, or similar.
• Familiarity with multi-agent frameworks (LangGraph, CrewAI, AutoGen) and agentic workflow design patterns.
• Experience fine-tuning LLMs (OpenAI, LLaMA, Mistral, or similar) for classification, summarisation, or domain adaptation tasks.
• Understanding of vector databases (Pinecone, FAISS, Qdrant) and embedding-based retrieval.
• Experience deploying AI services on cloud platforms (GCP, AWS, or Azure) with basic understanding of CI/CD pipelines.
• Ability to design voice agent systems with scalability in mind – handling concurrent calls, managing latency, and ensuring high availability.
• Good communication skills and willingness to work collaboratively across technical and non-technical teams.

Preferred Qualifications

• Experience building voice agents at scale (high call volumes, multi-tenant architectures, or enterprise-grade deployments).
• Familiarity with Salesforce integration, CRM automation, or customer service platforms.
• Knowledge of prompt engineering best practices, evaluation frameworks, and LLM observability tools (e.g., LangSmith, Weights & Biases).
• Experience with real-time streaming, WebSockets, or telephony APIs for voice applications.
• Background in property maintenance, facilities management, or field service operations (not required, but a bonus).
• Degree in Computer Science, Data Science, AI, or a related field (or equivalent practical experience).

Why Join Us?

• Work directly on production AI systems that impact thousands of real customers and field engineers daily.
• Gain hands-on experience with cutting-edge voice AI, multi-agent systems, and LLM technologies in a fast-paced environment.
• Be part of a small, high-impact AI team where your contributions are visible and valued from day one.
• Hybrid working with flexible hours and a supportive team culture that values innovation, transparency, and personal growth.
• Clear path for career development as our AI capabilities and team continue to scale.

Apply now and help us bring intelligent voice systems to life at one of London’s most recognised property service companies.