Prompt Engineer - £775p/d (Inside IR35) - 6 Months

iO Associates; City Of London; Hybrid; GBP 80,000 - 100,000; Part time

Job summary

A government engagement firm seeks a Prompt Engineer to design, test, and optimize prompts for large language models. Working in a hybrid role in London, you will have responsibilities such as building agent architectures and collaborating closely with diverse teams to enhance AI performance. Strong experience in prompt engineering and AI is essential for this opportunity.

Qualifications

• Proven experience designing and refining LLM prompts and AI agents.
• Strong analytical skills for assessing outputs and interactions.
• Experience managing prompt libraries and best‑practice templates.

Responsibilities

• Build agent architectures enabling autonomy and task completion.
• Integrate AI agents into apps, APIs, and automation workflows.
• Collaborate with research, product, and engineering teams.
• Optimise agent behaviour via feedback and user interaction.
• Evaluate performance and maintain safety mechanisms.
• Document agent logic, design, and dependencies.

Skills

Designing and refining LLM prompts

Analytical skills for assessing outputs

Managing prompt libraries

Cross-functional collaboration

Familiarity with evaluation frameworks

Understanding of LLMs and AI

Job description

Role: Prompt Enginer

Location: London (Hybrid)

Day Rate: £775p/d (Inside IR35)

Duration: 6 months (likely extension)

iO Associates have been engaged by a central government organisation to find a Prompt Engineer to design, test, and optimise prompts for large language models that power AI co-pilots and autonomous agents.

Working at the heart of public sector transformation, you'll collaborate with multidisciplinary teams to ensure AI delivers accurate, safe, and contextually relevant outputs that improve services for citizens.

Key Responsibilities:

• Build agent architectures enabling autonomy and task completion
• Integrate AI agents into apps, APIs, and automation workflows
• Collaborate with research, product, and engineering teams
• Optimise agent behaviour via feedback and user interaction
• Evaluate performance and maintain safety mechanisms
• Document agent logic, design, and dependencies

Key Skills & Experience:

• Proven experience designing and refining LLM prompts and AI agents
• Strong analytical skills for assessing outputs and interactions
• Experience managing prompt libraries and best‑practice templates
• Effective cross‑functional collaboration and communication
• Familiarity with evaluation frameworks and key performance metrics
• Up‑to‑date understanding of LLMs, prompt engineering, and agentic AI

Desirable:

• Experience with frameworks such as AutoGPT, CrewAI, or LangGraph
• Background in conversational UX or human‑AI interaction
• Knowledge of vector databases or RAG techniques
• Awareness of ethical and safety considerations in AI system

If you'd like to learn more, feel free to reach out directly or email for a confidential chat.