Market Data Team Lead in London

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.

About the Role: At BMLL we process financial data in a process we call parsing. We continually add new financial datasets to our platform whilst upgrading and improving existing ones. Parsing occurs in well defined data pipelines built using a distributed architecture. The engineering of the pipeline is as important as the data transformation process, and we are constantly working to improve its performance and reliability. We curate the data to ensure the highest quality of delivery to our customers. Every day we consume over 1TB of new data across 750,000 securities to deliver into our platform, our dashboard products and data services. These are accessed by our customers who are dependent on our services for their own workflows. We are in the process of a major technology migration, moving our core data pipelines from generating HDF5 files into generating Delta Tables. This will improve efficiency, ensure future scalability and modernise the architecture.

We are looking for an experienced lead to head up a small team (currently 4) in this migration project, and in future architectural and infrastructural changes to our systems, such as performance improvements: performance really matters as we process terabytes of data per day, and need to get it in front of our customers as early as possible. The role will involve an amount of hands‑on development work, in C++ with some Python, organising developers in Agile sprints, and leading scrums as we work through the migration. Planning is a key aspect, both at the sprint level and at the quarterly level alongside the Lead Architect, CTO and Product Team. Within the team, a key focus is helping to unblock developers by working with other teams and providing guidance and technical expertise. You should expect to spend approximately 50% of your time in hands‑on development, and 50% in team management. You will work closely with the Equities and Derivatives market data teams who build the parsers, and the Data Feed team who get our data out to customers. This is an opportunity to join a cutting‑edge FinTech company with the potential to grow your technical, finance and cloud‑ & data‑engineering skills.

Responsibilities:

• Technical leadership and management of the delta lake migration team, organising work into 2‑week sprints, upwards reporting on progress and blockers.
• Development, testing and migration of some of the Delta Lake components.
• Quarterly planning with the Lead Architect, CTO and Product Team.
• In time, line management of a small number of developers.
• Understanding the data, how it reaches BMLL, how we process it and deliver it to customers.
• In time, some second‑line support of the daily data production processes and the data, shared amongst the data production teams on a rotational basis.

Essential:

• Demonstrated ability to lead a small team of developers in an Agile environment.
• Demonstrated ability to work with other teams to achieve business outcomes.
• Experience of working with Delta Lake or other open table formats.
• Industry experience of writing production‑level C++ and delivering functioning, well‑tested systems.
• Industry experience of developing on a Linux platform.
• Experience of industry‑standard development methodologies such as source code control, unit testing and continuous integration.
• Ability to self‑organise and deliver complex projects.
• Strong problem‑solving skills.
• Strong communication skills.
• Computer science or other STEM degree.

Benefits:

• Competitive salary.
• 25 days holiday plus bank holidays.
• Discretionary Bonus.
• Pension Scheme.
• Private Medical Insurance.
• Work remotely abroad for up to 40 business days each year.
• Life Insurance.
• Childcare Nursery Scheme.
• Combination of remote and London‑based office working, with 2 days in the office per week.
• A yearly Well‑being Physical Activity budget.
• Continuous learning through funded training and challenging projects.
• Collaborative culture.
• Weekly team lunches.
• Free Fruit, snacks, and drinks provided throughout the day (When office‑based).
• Regular Team Socials.
• Cycle to Work Scheme.

We are an inclusive employer and welcome applicants from all backgrounds. We are committed to removing barriers throughout our hiring process. If you have any special requirements or require reasonable adjustments to help you access career opportunities at BMLL, please do let us know.