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Marcus Webb

AI / ML Engineer
candidate2@example.com +44 7700 900102 London, UK (open to hybrid) linkedin.com/in/marcuswebb
Profile

ML engineer with 9 years' total experience, the last two focused on production LLM systems. Background in quantitative ML for financial services — risk models, anomaly detection — which gave me rigorous habits around validation, monitoring, and handling adversarial inputs. Deliberately pivoting toward AI product engineering at SaaS companies where I can see the end-user impact more directly. Strong Python, AWS, and a growing depth in LLM orchestration frameworks.

Experience
Senior ML Engineer — AI Platform Jan 2023 – Present
Veritas Financial Technology  · FinTech SaaS, 300 people, London
  • Owns Veritas's LLM inference infrastructure: model routing, prompt caching, cost tracking, and failover across OpenAI and Anthropic APIs. System handles ~180,000 completions/day at 99.7% uptime.
  • Built an AI-powered document analysis feature (regulatory filings, audit reports) using a multi-stage pipeline: OCR → chunking → embedding → retrieval → synthesis. Reduced analyst review time by ~4 hours per report.
  • Designed the evaluation framework: automated factual consistency checks using an LLM judge model, cross-referenced against ground-truth annotations. Enabled the team to ship two major prompt versions per month with confidence.
  • Led the migration from a monolithic GPT-4 call to a tiered model strategy (GPT-4o-mini for classification, GPT-4o for synthesis), cutting inference spend by 41%.
  • Introduced prompt versioning and A/B infrastructure, enabling controlled rollouts to subsets of the user base.
ML Engineer Jun 2020 – Dec 2022
Veritas Financial Technology  · same organisation, promoted
  • Built and maintained credit risk ML models (gradient boosting, survival analysis) deployed into the Veritas underwriting platform.
  • Developed the internal ML platform tooling: experiment tracking (MLflow), feature store (Feast), and model registry. Reduced model deployment cycle from ~3 weeks to 4 days.
  • Implemented real-time transaction anomaly detection (Isolation Forest + LSTM) reducing false positive rate by 28% versus the prior rule-based system.
Data Scientist Sep 2017 – May 2020
Huxley Associates  · Financial services consultancy, London
  • Delivered ML projects for tier-1 banking clients across credit, fraud, and customer analytics domains.
  • Frequently worked embedded in client data science teams; comfortable operating in regulated environments with formal model governance requirements.
Quantitative Analyst (Grad scheme) Sep 2015 – Aug 2017
Barclays Corporate Banking  · London
  • Rotational grad scheme across risk analytics and structured products. Developed portfolio stress-testing models in Python and SQL.
Skills
LLM / GenAI RAG, prompt engineering, LLM evaluation, model routing, LangChain, OpenAI API, Anthropic API, Chroma, pgvector ML / Python Scikit-learn, XGBoost, LightGBM, PyTorch (working knowledge), FastAPI, Pydantic, Pandas Infrastructure AWS (ECS, Lambda, SQS, S3, RDS), Docker, Terraform, GitHub Actions, MLflow Data PostgreSQL, Snowflake, dbt, Kafka
Education
BSc Mathematics and Computer Science (2:1)
University of Bristol
2011 – 2015