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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Data Engineer - **Company:** developrec - **Location:** Greater London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, Amazon Web Services, Microsoft Azure, Information Engineering, Data Governance, Data Infrastructure, Data Integrity, Extract Transform Load (ETL), Data Transformation, Graph Database, Python (Programming Language), Metadata, Rule Engine, Standard Sql, Data Streaming, Reinforcement Learning, Data Logging, Cloud Platform System, Large Language Models, Data Layers, Data Lineage, Feature Extraction, Data Pipelines - **Published:** September 8, 2026 - **Apply:** https://www.collegerecruiter.com/job/2840676335-senior-data-engineer ## About the Role We are looking for strong data engineering fundamentals combined with demonstrable semantic and ontology experience: * 5-8 years' experience in data engineering, data platform development or data-intensive systems * Strong SQL and Python for scalable data transformations and services * Experience with at least one major cloud platform (AWS, Azure or GCP) * Hands-on experience with semantic or ontology-driven data models, including: * RDF/OWL modelling, SHACL validation or ontology tooling * Semantic ETL and ontology mapping pipelines * Knowledge graph construction, enrichment and query patterns * Experience operationalising pipelines for AI systems, LLM workflows or retrieval ecosystems * Familiarity with modern data tooling and platform engineering practices * Comfortable working in iterative consulting delivery environments with evolving requirements, * High agency - independently drives complex workstreams end-to-end * Structured thinker - brings clarity and rigour to ambiguous, messy data domains * Collaborative - works effectively with ontology architects, AI engineers and consultants * Quality-driven - prioritises correctness, observability, maintainability and semantic integrity * Clear communicator - able to explain semantic concepts and data reasoning to non-technical stakeholders * Low ego, high ownership - focused on outcomes and value creation ## Description You will build production-grade data pipelines explicitly aligned to ontologies and semantic models. Your work will ensure that entity definitions, relationships, taxonomies and domain constraints are faithfully represented in data flows, making them reasoning-ready and AI-consumable. Working within a senior, cross-functional delivery model (consulting, ontology and engineering), you will play a foundational role in building robust semantic layers and enabling high-value AI systems for clients., * Design, build and maintain ETL/ELT pipelines aligned to ontology and knowledge graph structures * Implement transformations that respect entity models, relationships, taxonomies and domain constraints * Apply semantic enrichment patterns including mapping, harmonisation, linking and feature extraction * Deliver high-quality, structured data to downstream AI systems, agents, retrieval layers and decision engines * Translate conceptual ontologies into implementable schemas and data flows * Partner with ontology architects on entity modelling, semantic definitions, metadata and lineage * Deploy pipelines into ontology-aware platforms (e.g. graph databases, semantic layers, Foundry-style systems) * Ensure semantic compliance, data integrity and reasoning-readiness Data Quality, Observability & Lineage * Implement robust data quality frameworks (validation, profiling, anomaly detection) * Build observability into pipelines (lineage tracking, logging, freshness monitoring, schema drift detection) * Ensure alignment with governance, security and industry standards AI Enablement & Data Serving * Build high-quality datasets for retrieval pipelines (RAG), embeddings and conversational agents * Create data foundations supporting decision engines, reinforcement learning and value measurement * Partner with AI engineers to operationalise pipelines for LLM workflows and agentic systems Standards, Documentation & Reusability * Produce clear documentation for data models, schemas, ontologies and lineage * Codify semantic ETL patterns and reusable modelling templates * Contribute to internal accelerators, engineering standards and playbooks ## Related Videos - [Why Your AI Agent Keeps Hallucinating Your Data: Building Deterministic Context Layers](https://www.wearedevelopers.com/videos/2055-why-your-ai-agent-keeps-hallucinating-your-data-building-deterministic-context-layers) - [From Messy Queries to Scalable Systems - How Data Engineering actually works](https://www.wearedevelopers.com/videos/100203-from-messy-queries-to-scalable-systems-how-data-engineering-actually-works) - [A Data Mesh needs Open Metadata](https://www.wearedevelopers.com/videos/505-a-data-mesh-needs-open-metadata) - [WeAreDevelopers LIVE - GraalVM in action, Static Analysis insights and more](https://www.wearedevelopers.com/videos/1723-wearedevelopers-live-graalvm-in-action-static-analysis-insights-and-more) - [Data: The Deciding Factor in AI Success](https://www.wearedevelopers.com/videos/100310-data-the-deciding-factor-in-ai-success) - [Modern Data Architectures need Software Engineering](https://www.wearedevelopers.com/videos/1030-modern-data-architectures-need-software-engineering) ## Related Articles - [Data Engineer Salary UK](https://www.wearedevelopers.com/magazine/253-data-engineer-salary-uk) - [Graph and AI Trends 2026: Why Is AI Running but Not Yet Delivering?](https://www.wearedevelopers.com/magazine/680-graph-and-ai-trends-2026-why-is-ai-running-but-not-yet-delivering) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs) - [How to Become an AI Engineer](https://www.wearedevelopers.com/magazine/331-how-to-become-an-ai-engineer) - [Data Analyst Salary in the UK](https://www.wearedevelopers.com/magazine/278-data-analyst-salary-in-the-uk)