We built an end-to-end alternative data pipeline infrastructure over 14 weeks. (1) Universal data ingestion framework: a configurable ingestion system that onboarded new data sources through configuration rather than custom code. Data source connectors: pre-built connectors for common data delivery methods (SFTP, API, S3, cloud storage, streaming) with configurable parsing for CSV, JSON, Parquet, and proprietary formats. Schema inference and mapping: automated schema detection with manual override, mapping raw data fields to the fund's canonical data model. Quality validation: automated data quality checks at ingestion — completeness (are all expected records present?), freshness (is the data arriving on schedule?), consistency (do values fall within expected ranges?), and uniqueness (are there duplicate records?). Onboarding time: reduced from 6-8 weeks to 5-7 days for standard data sources. (2) Centralised feature store with point-in-time semantics: a feature store that eliminated training-serving skew and look-ahead bias.
Feature registry: all features registered with metadata — calculation logic, data sources, update frequency, owner, and documentation. Researchers could discover existing features before building new ones, eliminating duplication. Point-in-time retrieval: features stored with temporal metadata enabling point-in-time correct retrieval — when a researcher requested features for a historical date, the feature store returned only information that would have been available at that date. This eliminated look-ahead bias by construction rather than relying on researcher discipline. Dual computation: features computed once and served to both research (Python notebooks, backtesting frameworks) and production (trading systems) — eliminating training-serving skew. (3) Real-time streaming pipeline: Kafka-based streaming infrastructure for intraday data. Stream processing: Apache Flink processing real-time data feeds — social media sentiment, news events, and real-time alternative data — with sub-second latency.
Real-time feature computation: streaming features (rolling sentiment scores, real-time momentum indicators, event-driven signals) computed in the streaming layer and served to intraday trading models. Hybrid batch-streaming: historical data processed in batch (Spark), real-time data processed in streaming (Flink), unified through the feature store — researchers could develop strategies using both historical and real-time features without managing the infrastructure complexity. (4) Data lineage and governance: comprehensive tracking for regulatory compliance. Lineage tracking: every data transformation tracked — from raw ingestion through feature computation to model input. Lineage metadata captured: source data (provider, delivery timestamp, record count), transformations (computation logic, code version, execution timestamp), and consumers (which models and strategies used which features). Access controls: role-based access to data and features — compliance team could audit who accessed what data and when. Regulatory reporting: automated generation of data lineage reports for SEC examination readiness.
(5) Data quality monitoring: continuous pipeline health assessment. Automated monitoring: data freshness alerts (data not arriving on schedule), quality alerts (validation checks failing), drift detection (statistical properties of data changing — which might indicate a provider issue or a genuine market regime change), and cost monitoring (compute resource utilisation and cloud spend by pipeline).