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

Mastek

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