
BMLL is an award-winning data and analytics company operating at the cutting edge of capital markets. Our mission is to unlock the predictive power of pricing data and offer our clients the insight…

BMLL is an award-winning data and analytics company operating at the cutting edge of capital markets. Our mission is to unlock the predictive power of pricing data and offer our clients the insight…
Headquarters: London
Founded: 2014
Product: Harmonised Level 3 historical order-book data, analytics and cloud data-science platform
Customers: Banks, brokers, asset managers, hedge funds, exchanges and academic institutions
Notable investors: Optiver, Nasdaq Ventures, FactSet, IQ Capital (Growth Fund), Snowflake Ventures
Quantitative market-data analytics and historical order-book data for capital markets
2014
Financial Services
$21,000,000
Reported strategic investment led by Optiver; Optiver joined the investor board.
Investment announced involving Snowflake Ventures.
Investment involvement by Nasdaq Ventures reported.
“Has attracted strategic investments from major market-structure and data firms (Optiver, Nasdaq Ventures, FactSet, Snowflake Ventures), indicating institutional investor interest in its market-data and analytics proposition.”
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About BMLL:
BMLL is the leading independent provider of harmonised Level 3, 2 and 1 historical data and analytics across global equities, ETFs, futures and US equity options. We provide market participants with immediate access to granular T+1 order book data and advanced analytics, enabling them to accelerate research, optimise trading
strategies, and better understand market behaviour.
BMLL was acquired in 2025 by Nordic Capital, alongside minority shareholder Optiver, marking a joint commitment to accelerate the company’s next phase of growth.
We offer an inclusive and collaborative culture, a hybrid working environment that includes regular days in our London office, weekly team lunches, and a variety of out-of-hours social activities.
For more information, visit our website or follow us on X (@bmlltech) and LinkedIn @BMLL.
About the Role:
BMLL transforms financial exchanges’ raw market data into an accessible and normalised view for customers across multiple use-cases. We hold over 10 years of full-depth market data across approximately 100 venues, this currently consists of about 1.5 billion HDF5 files (~1.5 PB) stored on S3 and catalogued in Postgres. These are partitioned by date, venue, and instrument.
While this structure has served us well, the enormous number of small files, with the Postgres catalogue in separate storage, is now the main constraint on how we evolve, back-up/recover, and share data. Our strategic direction is to migrate this processed layer to Delta Lake for both data and catalogue. In addition we are migrating our Data Products which currently sit in Snowflake over to Iceberg compatible Delta Tables in order to leverage benefits of performance, cost and manageability.
We are looking for an experienced Databricks Lead Engineer and Architect to join and support the Delta Lake and Delta Table re-engineering projects. This is a hands-on role and with direct contribution to the project.
The goal is not merely format migration, but addressing key architectural objectives for high-cardinality data:
This is an opportunity for an experienced engineer to join a cutting-edge FinTech company and make an impact on a critical and large-scale re-engineering project.
Requirements
ESSENTIAL:
DESIRABLE:
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