Location
London

Hours
Full Time, Permanent

Salary
Negotiable

About the Role
We’re hiring a Senior AI Engineer to design and deliver AI systems across the business. This hands-on role focuses on building production-grade solutions using large language models (LLMs) and agentic systems, embedding AI directly into core business processes rather than isolated prototypes. You will take high-value problems and turn them into scalable, reliable systems used in real workflows, driving measurable business outcomes. You will contribute significantly to technical direction, architecture, and implementation, translating defined business priorities into robust, production-ready systems. Working closely alongside engineers, you will deliver reusable, scalable solutions built for long-term impact.

Key responsibilities include designing and implementing AI systems end-to-end, building LLM-powered and agent-based solutions from concept to production, contributing to engineering standards and reusable components, making informed technical decisions on models, tooling, infrastructure, and system design, ensuring systems are robust, observable, and production-ready with evaluation, monitoring, and guardrails, and providing technical guidance and mentorship to engineers involved in AI initiatives.

Benefits
26 days holiday rising to 30 with service, holiday buy scheme (up to 5 extra days), double matched pension with up to 14% contribution from NewDay, generous annual performance bonuses, private medical insurance with Bupa including mental health support and cancer care, 26 weeks paid maternity, adoption and shared parental leave, free breakfast and lunch daily provided by in-house chefs, and more.

NewDay values diversity and is an equal opportunity employer. We foster an inclusive culture where all colleagues can bring their whole selves to work. Reasonable adjustments are provided to support candidates with disabilities or caring responsibilities throughout the application and interview process.

Experience
- Proven experience delivering production-grade AI systems end-to-end
- Experience designing and implementing complex AI systems across multiple use cases or domains
- Strong expertise in generative AI / LLMs, including orchestration, prompting, and evaluation
- Experience building agentic or multi-step AI systems
- Strong software engineering fundamentals including APIs, system design, and cloud-based architectures
- Ability to operate effectively in ambiguous or fast-moving problem spaces
- Experience contributing to and influencing engineering standards and practices across projects

About you
- Proactive and hands-on engineer with a passion for building scalable AI solutions
- Comfortable making technical decisions and guiding teams
- Adaptable to fast-paced and evolving environments
- Collaborative and able to mentor and support fellow engineers

Qualifications
It’s a plus if you have experience contributing to AI platforms or reusable frameworks and patterns, familiarity with LLMOps / MLOps and production evaluation practices, experience embedding AI into core business processes or enterprise systems, and experience working in large-scale or regulated enterprise environments.