Data Engineer - SC Cleared

MORELA

AI & Engineering Recruitment

Data Engineer (RAG & Retrieval)

2-year contract | Central London | Active SC | Outside IR35

Morela is supporting a specialist technology consultancy on a 2-year Data Engineer contract in Central London, delivering on a UK government programme. Outside IR35, rate TBC. We need a genuinely strong all-round data engineer first and foremost, with recent hands-on RAG experience on top. Active SC is essential - eligibility will not be considered.

About the Client

A specialist technology consultancy embedding engineers into SC-cleared government delivery teams. They focus on long-term programme work and give their engineers real ownership of what they build.

The Role

You will own the data platform behind the programme, from ingestion and modelling through to the retrieval layer that powers its AI capability. The core of the job is solid data engineering - reliable pipelines, clean models and well-governed data. On top of that you will build the RAG pipelines that turn large volumes of unstructured material into accurate, access-controlled answers.

Responsibilities

Core data engineering

Design, build and maintain robust batch and streaming pipelines (ETL/ELT) across structured and unstructured sources

Model data for analytics and downstream use, with clear schemas, lineage and documentation

Own data quality, validation, monitoring and alerting so the platform can be trusted

Optimise pipelines and storage for performance, cost and scale

Apply security, governance and access controls appropriate to an SC environment

RAG and retrieval

Build ingestion for unstructured content, including document parsing, OCR and metadata enrichment

Build production RAG pipelines: chunking, embeddings, hybrid search (vector + BM25), reranking and context assembly

Enforce document-level access controls at query time

Evaluate retrieval and generation quality with measurable metrics, and iterate

Work with self-hosted and open-weight models in secure or air-gapped environments

SC clearance: Active SC held, not eligibility

Essential Requirements

Core data engineering

Strong commercial data engineering background, building and running production pipelines end to end

Excellent Python and SQL

Solid grasp of data modelling, warehousing and lakehouse concepts

Hands-on with orchestration (e.g. Airflow, Dagster) and distributed processing (e.g. Spark)

Experience with cloud data platforms (AWS, Azure or GCP) and containerised deployment (Docker, Kubernetes)

Good engineering practice: version control, CI/CD, testing and infrastructure as code

RAG

Recent RAG delivery: Hands-on RAG systems built and shipped recently - current work, not an old proof of concept

Vector databases (e.g. pgvector, OpenSearch, Qdrant, Weaviate), embeddings, hybrid search and reranking

Experience evaluating RAG systems properly (e.g. (email address removed), faithfulness)

Streaming platforms such as Kafka

Agentic or multi-hop retrieval, GraphRAG, query rewriting

vLLM or similar for on-prem model serving

LangChain, LlamaIndex, RAGAS or Langfuse

Government, defence or national security programmes

Desirable Experience

Working Environment

Central London, SC-cleared environment, embedded in the programme team. Outside IR35, 2-year contract.

For immediate consideration email (url removed)