Open Source in Finance Forum London 2026

Financial institutions operate under intense pressure to modernise their engineering practices while maintaining robust governance, security, and regulatory compliance. As technology estates grow and teams become more distributed, organisations face recurring challenges: duplicated effort, slow delivery, inconsistent standards, difficulty sharing knowledge, and fragmented developer experience. InnerSource – applying open source principles inside the enterprise - offers a powerful way to address these issues. But adoption is often uneven, misunderstood, or difficult to scale without clear structures and tangible evidence of value.

This joint session from NatWest and Citi presents practical guidance for how financial institutions can successfully adopt and scale InnerSource in a regulated environment. We combine real case studies, OSPO-led enablement approaches, patterns derived from the InnerSource Commons, and a value metrics framework that quantifies InnerSource’s impact across teams and platforms.

Participants will walk away with practical frameworks, proven patterns, and next steps for joining and contributing to the InnerSource SIG.