Hi all,

Greetings from Mastek!

🚀 We’re Hiring: Senior Prompt Engineer

📍 Flexible / Hybrid (UK-based)

🔐 SC Cleared / Eligible Required

Role Overview

We are looking for a Senior Prompt Engineer to lead the design, optimisation, and scaling of advanced prompting strategies for large language models (LLMs). This role focuses on delivering context-aware, safe, and efficient AI outputs across complex enterprise use cases.

You will work closely with engineering teams to integrate prompts into application workflows, autonomous agents, and RAG pipelines, while continuously improving performance, reducing latency, and ensuring output consistency.

Key Responsibilities

• Design and implement advanced, dynamic prompts tailored to business-specific use cases
• Optimise LLM performance by reducing token consumption, latency, and hallucinations
• Integrate prompts into agent-based systems, APIs, and RAG architectures
• Develop prompt frameworks and reusable templates for scalable deployment
• Establish evaluation, benchmarking, and regression testing mechanisms
• Implement guardrails to mitigate prompt injection and unsafe outputs
• Collaborate with product and engineering teams to translate business requirements into technical prompt logic
• Maintain a version-controlled prompt repository with continuous improvements

Required Skills & Experience

• 5+ years in software engineering with 2+ years in production-level prompt engineering
• Strong expertise in LLMs: GPT-4, Claude, Llama, Mistral, Nova (or similar)
• Advanced programming skills in Python and/or Java
• Experience with AI orchestration frameworks such as:
• LangChain
• LlamaIndex
• Hands-on experience with prompt evaluation and monitoring tools, such as:
• LangSmith
• Fiddler
• InspectAI
• OpenAI Evals

Preferred Qualifications

• Bachelor’s or Master’s degree in Computer Science, AI, Statistics, Cognitive Science, or related quantitative fields

Cheers,

Priyanka