Senior Data Engineer

## About Polymarket Polymarket is the world's largest prediction market platform. We enable individuals to express views on real-world events by trading on outcomes across politics, economics, sports, culture, and current affairs. Built as a peer-to-peer marketplace with no centralized "house," Polymarket aggregates diverse opinions into transparent, market-based probabilities that reflect collective expectations about the future. We're growing fast — both in terms of volume ($21B traded in 2025) and adoption as an alternative news source. Our ambition is to become a ubiquitous beacon of truth in global media and we need your help adding fuel to the fire.

## What You'll Do - **Own the OLAP analytics layer.** Drive our columnar warehouse environment end-to-end: raw event ingestion → cleaned facts and dimensions → business aggregates → API-serving views. You'll own materialized view design, refresh cadences, dictionary catalog, query planning, and cost optimization. - **Partner on the OLTP serving layer.** Work closely with the team on high-write serving tables that back our product APIs – partition strategy, indexing, trigger pipelines, autovacuum tuning, and bloat monitoring – with sub-100ms read-path discipline. - **Shape streaming and data lake infrastructure.** Define Kafka topic schema contracts, evolve the S3 lake layout with modern table formats, and contribute to parity-validation tooling that guards data correctness under migration pressure. - **Design data models at scale.** Work with event-sourced, append-mostly data with chain-reorg semantics. Design the derivative analytics – PnL, realized/unrealized position tracking, cohort metrics – and formalize ownership boundaries between upstream ingestion and downstream analytics. - **Coordinate across teams.** Negotiate schema contracts with the warehouse-owning team and downstream consumers including frontend, notifications, and third-party integrators.

## What We're Looking For - 5+ years of data engineering on production systems serving real users at scale - Deep knowledge of OLTP/OLAP split architectures: you know when a row store wins, when a column store wins, and when to use both - Columnar warehouse expertise: ClickHouse strongly preferred; Snowflake, BigQuery, Redshift, or Apache Pinot accepted if fundamentals are solid - Data lake experience: Parquet, Iceberg (or Delta/Hudi), compaction strategies, S3 layout discipline - Streaming pipeline experience: Kafka, exactly-once vs. at-least-once reasoning, backpressure, consumer-group patterns, schema evolution - Strong data modeling fundamentals: star/snowflake, SCD patterns, CDC, idempotent event sourcing, dimensional vs. event-log tradeoffs - PostgreSQL at scale: partitioning, index design, autovacuum/bloat remediation, query planning, CDC triggers vs. logical replication - SQL fluency at warehouse scale: window functions, CTEs, dictionary-based enrichment, dialect specifics - Distributed systems reasoning: consistency models, event ordering, replay semantics, write-once vs. mutable state, reorg handling - **(Plus)** EVM indexing experience: rindexer, subgraphs, or comparable – this shortens ramp considerably - **(Plus)** Rust: you'll touch indexer and validation tooling codebases; comfortable reading and contributing - **(Plus)** Domain knowledge in DeFi, prediction markets, or order-book systems - **(Plus)** Observability and SLO thinking: Prometheus metrics design, dashboard discipline, alert-fatigue avoidance - **(Plus)** Python for SQL tooling, ad-hoc analysis, and one-off migrations - **(Plus)** Track record shipping a platform migration or greenfield data stack under a hard deadline

## Benefits - Competitive salary & equity - Unlimited PTO - Full Health, Vision, & Dental coverage - 401k match - Hardware setup: new MacBook Pro, big display, & accessories

Polymarket is the world's largest prediction market platform where users trade on the outcomes of real-world events such as politics, sports, economics, and more, using USDC cryptocurrency on the Polygon blockchain. It provides real-time odds reflecting news, polls, and events, and operates globally with a US-regulated entity.