Quantitative data analyst in asset management

Lazard Asset Management's Advantage Quantitative Equity team is hiring a Senior Quantitative Data Analyst to take ownership of the quality, reliability, and usability of the quantitative datasets that power our research and production investment workflows. These datasets are the direct inputs to factor models, risk models, alpha signals, backtests, and live portfolio construction - data quality here has real investment consequences.

• Own quant datasets (market data, fundamentals, corporate actions, identifiers/reference data) end to end: their structure, lineage, known quirks, and intended use in research and production. It is on you to make sure the data is fit for use and that data projects keep moving.
• Assess the current state of our datasets, prioritise remediation, and make incremental improvements to existing tables and databases, including restructuring them where needed.
• Model and design datasets: choose the right grain, keys, and history handling (e.g. slowly changing reference data vs. daily time series, point-in-time / as-known storage), and implement those designs in our databases.
• Extend and enrich datasets: longer history, higher frequency (e.g. monthly to daily), additional coverage.
• Onboard new datasets end to end: profiling, schema/coverage validation, identifier mapping and normalisation, cross-source reconciliation, documentation, and support for productionisation.
• Build and maintain automated data validation and monitoring (completeness, timeliness, duplication, outliers, stale/missing series, mapping breaks), with clear quality metrics and dashboards - implemented in code, not spreadsheets.
• Build investigation tools and reusable libraries that let you and the team diagnose data issues quickly and self-serve on data questions.
• Investigate data anomalies affecting research or production output: triage, isolate root cause, quantify impact, coordinate remediation, and write the code that prevents recurrence.
• Build and maintain data pipelines and DAGs - ingestion, transformation, backfills, and reruns - and collaborate with quant developers to harden and operationalise them.
• Act as the primary point of contact with data vendors on issues affecting your datasets; evaluate new sources and vendor changes.
• Set and maintain conventions for dataset documentation, quality standards, and operational runbooks across the data ecosystem.
• Use AI tools effectively in your work - for coding, investigating issues, and detecting anomalies.

• Bachelor's degree in a quantitative discipline (e.g., Statistics, Mathematics, Economics, Finance, Computer Science) or equivalent practical experience.
• Typically 5+ years of relevant experience, working with quantitative financial data at an investment firm - e.g., a quantitative asset manager, systematic hedge fund, or other buy-side environment.
• Hands-on experience with several core dataset types - prices/returns, fundamentals, corporate actions, security master / reference data, factor data, risk model inputs - from at least two major vendors such as Bloomberg, Refinitiv/LSEG, S&P/Compustat, FactSet, MSCI, or ICE.
• Solid understanding of the data quality challenges specific to systematic investing: point-in-time correctness, survivorship bias, staleness, partial trading days, identifier changes (CUSIP/ISIN/SEDOL/ticker), and corporate action adjustments.
• Experience reconciling across sources and managing vendor schema/definition changes over time.
• Strong Python, including pandas and NumPy: able to write clean, maintainable code independently, organise it into reusable libraries used across a codebase, and build validations and automation of real substance. This is not a light scripting role.
• Strong SQL: multi-table joins, aggregations, window functions, and CTEs, used to investigate and reconcile discrepancies across large analytical datasets.
• Data modeling and database experience: designing schemas and tables for financial time-series and reference data (grain, keys, history/versioning), and working hands-on with relational or analytical databases, including a working sense of performance (indexing, partitioning, query plans).
• Strong analytical and debugging judgement; able to diagnose data inconsistencies systematically, prioritise among competing issues, and drive fixes to completion.
• Strong communication skills; effective working with a distributed team (London, Boston, and New York) and directly with researchers and vendors.
• Будет плюсом: Experience with pipelines and orchestration (e.g., Airflow, Prefect, Dagster, or similar) - strongly preferred; Practical experience applying AI tools to data work (coding assistance, investigation, anomaly detection); Experience supporting production data pipelines and incident workflows (monitoring, alerts, runbooks, operational readiness); Familiarity with modern data warehouses (e.g., Snowflake) and/or analytical engines (e.g., DuckDB, Polars); deeper query optimisation on large datasets; Version control (Git), testing, and code review practices; Cloud experience (we use Azure); familiarity with CI/CD

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