Arcesium

Arcesium is a financial technology company that provides a cloud-native platform to systematize complex workflows across the investment lifecycle. The platform manages over $6.4 trillion in gross AUM for sophisticated financial institutions, meaning the attack surface spans high-value data pipelines, real-time financial transactions, and client reporting systems across six continents. The company was founded in 2015 and employs over 2,400 professionals including engineers, accountants, operations, and treasury staff, with offices in London, Lisbon, and Hong Kong. Security work here sits at the intersection of cloud-native architecture and financial infrastructure - think securing distributed systems that handle sensitive portfolio data, enforcing access controls across multi-tenant environments, and maintaining compliance in a regulatory-heavy domain. The platform's scale means any vulnerability in data handling or workflow automation carries outsized consequences: misconfigured permissions or unpatched dependencies don't just mean downtime, they mean exposure of institutional-grade financial data. The engineering culture emphasizes ownership and proactive problem-solving, with annual hackathons and an expectation that contributors engage meaningfully from early on. The company explicitly balances efficiency with control - a tension that defines much of the security posture in financial tech, where speed-to-market and audit rigor are in constant negotiation.