Senior Python Engineer

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. 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 microservices. FinTech: Experience in delivering SaaS applications into front-office capital markets. Design: Proficient in architecture design using AWS services such as Cognito, Lambda, Fargate, API Gateway, Terraform. Data Skills: Experience in data science and financial data visualisation applications in Typescript. Problem Solving: Strong analytical and troubleshooting skills. Communication: Excellent communication skills to interact effectively with development teams and product managers. Desirable Skills Excellent communication skills, with the ability to communicate fluently with both technical and non-technical audiences. Experience with data science tools, e.g. one or more of Spark, pandas, DuckDB, DataBricks, Snowflake. Knowledge of agile development and continuous delivery methodologies. 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 pride ourselves on our commitment to Equality and Diversity. 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 at careers@bmlltech.com.