SeniorPythonEngineer

**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:** This is a unique opportunity to build industry-leading technology, drive innovation and influence the direction of our company. The BMLL Lab & Vantage products are the market leading applications for data science and data visualisation on the largest financial datasets. This role involves working in a team of Python & Typescript engineers, alongside the SaaS applications Product Owner. As a senior engineer you will take the lead on design and implementation of new features. **Key Responsibilities:** * Partner closely with Product Owner in translating complex requirements into clear, actionable engineering tasks. * Contribute to the application design and development, with effective strategies for testability and product quality. * Ensure the architecture of the system aligns with best practice and meets the goals for scalability, reliability & security. * Provide mentorship to junior engineers. **Requirements** * Leadership: Proven experience in designing solutions in a fast-paced agile environment. * SaaS: Expertise in developing single-tenant and multi-tenant B2B SaaS applications with REST APIs and distributed micro