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Mastek

Senior Prompt Engineer

Reading
Posted 7 days ago
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Senior Prompt Engineer

Senior Prompt Engineer

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

  • Location: Flexible / Hybrid (UK-based)
  • Security: SC Cleared / Eligible Required

Role Overview

This role involves:

  • Collaborating with engineering teams to integrate prompts into application workflows, autonomous agents, and RAG pipelines
  • Focusing on performance improvement, latency reduction, and output consistency
  • Ensuring safe and scalable deployment of LLMs with real-time monitoring and refinement

Key Responsibilities

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  • Design and implement dynamic, business-specific prompting strategies
  • Optimise LLM performance (token efficiency, latency, hallucination reduction)
  • Integrate prompts into agent-based systems, APIs, and Retrieval-Augmented Generation (RAG) architectures
  • Develop reusable prompt frameworks and templating for scalable deployment
  • Establish evaluation, benchmarking, and regression testing mechanisms
  • Implement guardrails for prompt safety, injection prevention, and behavior control
  • Work closely with product and engineering teams to translate business needs into technical prompt logic
  • Maintain a version-tracked prompt repository for continuous performance iterations

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Skills & Experience

Requirements

  • 5+ years in software engineering, including 2+ years in production-level prompt engineering
  • Expertise in LLMs:
    • Proficiency with GPT-4, Claude, Llama, Mistral, Nova, or similar models
  • Advanced coding skills in Python and/or Java
  • AI orchestration frameworks:
    • Hands-on experience with LangChain, LlamaIndex, and similar tools
  • Prompt evaluation & monitoring:
    • Expertise with LangSmith, Fiddler, InspectAI or OpenAI Evals

Preferences

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

Priyanka (Mastek Team)

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Skills

Prompt Engineering
Large Language Models
Python
Java
AI Orchestration
LangChain
LlamaIndex
Prompt Evaluation
Monitoring Tools
LangSmith
Fiddler
InspectAI
OpenAI Evals
Token Optimization
Performance Improvement
Regression Testing

Location

Reading, England, United Kingdom

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