Senior Data Engineer (DV Cleared) | Defence Tech | SW UK

We’re partnering with a leading global technology and defence firm that delivers mission-critical solutions across some of the UK’s most secure and complex environments. As their data capabilities continue to expand, they are seeking a Senior Data Engineer to play a key role in designing and delivering secure, scalable data platforms that support critical operational and strategic outcomes.

What You’ll Do

• Design, build and maintain secure, scalable data platforms across ingestion, storage, processing and analytics workloads.
• Develop robust data pipelines using Apache NiFi, Python and SQL, integrating complex data from APIs and enterprise systems.
• Define and implement data models, schemas, data contracts and Interface Control Documents (ICDs) to support reliable system integration.
• Drive data quality, governance, lineage and traceability standards, ensuring data remains accurate, trusted and auditable.

• Collaborate closely with engineers, analysts, data scientists and customer stakeholders to deliver resilient, production-ready solutions., We are happy to provide application and/or accessibility support, please contact your Marks Sattin or Grafton consultant directly to discuss your needs. We’re committed to protecting the privacy of all our candidates and clients, please visit and for our privacy policy. Skills

• Data Engineer
• Python
• SQL

• Proven experience delivering data engineering solutions within complex project or production environments.
• Strong hands-on experience with Python and SQL, building and optimising scalable data pipelines.
• Expertise with Apache NiFi and data orchestration across multiple sources and systems.
• Experience designing data models, schemas, data contracts and integration frameworks.
• Strong understanding of REST API integration, Parquet data formats and S3-compatible object storage.
• Experience deploying or supporting data platforms within OpenShift or Kubernetes environments.
• Knowledge of GitLab CI/CD and modern software delivery practices.
• Understanding of data validation, assurance, metadata management, lineage and data governance principles.
• Strong stakeholder engagement, problem-solving and communication skills.

Active DV Clearance required

If you’re an experienced Data Engineer who enjoys solving complex problems, influencing technical direction and building secure data platforms that make a measurable impact, we’d love to hear from you. Please share your CV for a confidential discussion.