AI Systems Engineer: Build & Validate Production Workflows

Just Eat Takeaway.com; Chertsey; On-site; GBP 80,000 - 120,000; Full time

Job summary

Just Eat Takeaway.com is seeking a technically sharp, product-minded engineer to push the frontier of AI across the business. You'll work with ambitious internal teams and technology partners, turning AI learnings into durable improvements across our organisation.

This builder role digs into complex workflows, prototypes prompts and agents, and synthesises findings into reproducible evaluations, benchmarks, and artefacts that raise product and platform quality.

Qualifications

• Experience building AI applications, agents, or evaluation systems, with the ability to reason clearly about model behaviour in complex workflows.
• Comfort working directly with highly experienced functional SMEs and translating their challenges into concrete technical signals.
• Production experience with AWS at scale, using services like ECS, Lambda, DynamoDB, SQS
• Fluency moving between prototyping, debugging, evaluation design, and cross-functional collaboration - sometimes all in the same day.
• Working across every layer of the stack - Able to switch between configuring a connector in an admin panel to prompting an agent to contribute code back to our underlying platform.
• Clear communication across technical and non-technical audiences - you can explain what you found and why it matters.
• High agency and a strong product sense, with a bias toward building things that last rather than one-off fixes.
• AI First problem solving, deeply experienced with AI tools to drive fast solution creation, able to balance model usage to maximise ROI, everything from coding to design and more.
• Bonus: Familiarity with complex marketplace businesses. Experience as an early-stage startup engineer or in a previous FDE style role. None of these is a dealbreaker - we're more interested in how you think than what you've already shipped.
• AWS Solutions Architect - Associate (Nice to have)

Responsibilities

• This is a builder role. You'll dig into complex workflows, identify gaps, and translate them into technical insights that shape how we build.
• Prototype and iterate on prompts, agents, and workflow designs to understand system behaviour and unlock real value.
• Synthesise findings for our Product Engineering and Platform teams, turning usage patterns into evaluations, benchmarks, and artefacts that improve product and platform quality.
• Build repeatable tools, patterns, and evaluation approaches that raise the quality bar across multiple use cases.
• Operate with strong judgment in ambiguous environments, balancing immediate technical problem-solving with longer-term systemic improvement.
• Build relationships across our engineering and product communities as a trusted technical partner.

Skills

AI applications

Agents

Evaluation systems

Prototyping

Cross-functional collaboration

Product mindset

Debugging

Tools

AWS

ECS

Lambda

DynamoDB

SQS

Job description

Just Eat Takeaway.com is seeking a technically sharp, product-minded engineer to push the frontier of AI across the business. You'll work with ambitious internal teams and technology partners, turning AI learnings into durable improvements across our organisation.

This builder role digs into complex workflows, prototypes prompts and agents, and synthesises findings into reproducible evaluations, benchmarks, and artefacts that raise product and platform quality.