Principal Python Engineer (AI/LLM)

MCS Group; Belfast; On-site; GBP 72,000 - 85,000; Full time

Job summary

A top recruitment agency in Belfast is seeking a Principal Python Developer to work at the forefront of applied AI. You will design and deploy scalable AI applications while collaborating with clients to create impactful solutions. The ideal candidate has over 5 years of software engineering experience, strong Python skills, and familiarity with frameworks like LangChain. This position offers a salary of up to £85,000 along with a leading benefits package.

Qualifications

• 5+ years' experience as a software engineer with exposure to LLM or AI-driven systems.
• Strong Python development skills and experience with frameworks like LangChain or LlamaIndex.
• Understanding of prompt engineering, API-level LLM usage, and modern data pipelines.

Responsibilities

• Build and deploy LLM-powered applications using Python and modern frameworks.
• Develop intelligent agents, APIs, and secure integrations.
• Apply advanced techniques such as RAG, knowledge graphs, and vector databases.
• Work directly with clients to deliver scalable, compliant AI solutions.

Skills

Python development skills

Experience with LangChain or LlamaIndex

Understanding of prompt engineering

Strong problem-solving skills

Communication skills

Job description

MCS Group are looking for a Principal Python Developer to join a fast-growing, AI-led company based in Belfast. This is your chance to work at the cutting edge of applied AI, building real-world solutions powered by Large Language Models (LLMs). As the Principal Python Developer, you'll design, prototype, and deploy scalable AI applications using the latest tools and frameworks. You'll work to turn complex concepts into production-ready solutions that make an impact across different sectors.

Key Responsibilities

• Build and deploy LLM-powered applications using Python and modern frameworks.
• Develop intelligent agents, APIs, and secure integrations.
• Apply advanced techniques such as RAG, knowledge graphs, and vector databases.
• Work directly with clients to deliver scalable, compliant AI solutions.

The Ideal Candidate

• 5+ years' experience as a software engineer with exposure to LLM or AI-driven systems.
• Strong Python development skills and experience with frameworks like LangChain or LlamaIndex.
• Understanding of prompt engineering, API-level LLM usage, and modern data pipelines.
• Strong problem-solving and communication skills, with the ability to work in agile teams.

Salary

Up to £85,000, with a leading benefits package.

To speak in absolute confidence about this opportunity, please send an up-to-date CV via the link provided, or contact Matthew Hamill, IT Recruitment Consultant, at MCS Group.

Even if this position is not right for you, we may have others that are. Please visit MCS Group to view a wide selection of our current and exclusive roles www.mcsgroup.jobs

All conversations will be treated in the strictest of confidence.

MCS Group is committed to Equality, Diversity, and Inclusion for all, being the first recruitment agency in NI to achieve Bronze Diversity Mark accreditation, if you have a disability which means you require a reasonable adjustment to be considered at any stage of the recruitment process, please contact us and we will endeavour to facilitate the request.

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