Vamstar
Senior AI & Ab Initio Engineer UK
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Senior AI & Ab Initio Engineer - Fintech AI
Location: UK only | Remote with few days onsite per month
Existing Clients: Large FinTech Company
Type: Full-time Contractor
Core responsibilities & objectives
- Design, build, and migrate Ab Initio workflows to AWS Glue/PySpark.
- Write production-grade, well-tested Python that processes large volumes of data and documents reliably.
- Must have hands-on experience using AI coding tools (e.g., Claude) to generate PySpark / AWS Glue code and build test harnesses.
- Own pipeline health: if data is stale, broken, or wrong, it's on you.
- Work autonomously to project deadlines with minimal hand-holding.
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Key qualifications & skills (non-negotiable)
- 7+ years in backend data-heavy development or data engineering.
- Highly proficient in Python.
- Production experience with Ab Initio deployments and cloud migrations.
- Hands-on experience with large datasets and high-velocity data streams (Kafka, Flink, Spark).
- Strong with pipeline orchestration tools (Airflow, MLflow, or equivalent).
- Solid SQL skills (Postgres, Redshift, or Snowflake) and NoSQL experience (DynamoDB, OpenSearch, Elastic).
- Real experience with LLM workflows: RAG architectures, embeddings/vector DBs, prompt engineering, function/tool calling, observability.
- Deep understanding of ETL/ELT patterns and data processing at scale.
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Preferred background (strong signals)
- Experience with AWS data stack at scale.
- Exposure to financial services industries.
- Built and shipped data, ML and LLM-powered pipelines in production.
- Has debugged a pipeline and knows why observability matters.
- Worked in a fast-moving startup where "that's not my job" doesn't exist.
Interested? We're a distributed team solving hard problems that will reshape the fintech industry. If you want ownership, not just tickets, we'd like to hear from you.
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