Jul 8, 2025

Written By: Copied First, let’s strip away the jargon. Being cloud-native doesn’t just mean “running in AWS.” It means: Infrastructure as code (Terraform, Pulumi) Stateless microservices with clear boundaries Real-time observability and autoscaling Zero-downtime deployments via CI/CD It’s not about lift-and-shift. It’s about design principles that unlock resilience and speed – qualities that traditional investment stacks struggle to offer. Why Legacy Rails Don’t Cut It Anymore Most legacy platforms – especially in finance – were built for batch processing, not streaming. For nightly ETLs, not real-time reconciliation. For quarterly releases, not daily pushes. That’s a problem when: A customer expects intraday performance analytics A regulator requests data lineage from T+0 trades A fund manager wants to rebalance in real time across multiple asset classes Legacy rails introduce bottlenecks at every turn. Slow I/O, fragile data schemas, manual deployments. And every new feature risks breaking a brittle foundation. The result? Innovation stalls. Performance lags. Clients leave. Case in Point: Clear Street & S-PRO Take Clear Street, one of the , they built their entire infrastructure as cloud-native from day one – clearing, custody, risk, and execution services. Every data point flows through a modern pipe, backed by streaming infrastructure and modular microservices. That architecture lets them process billions in trades daily while pushing updates without outages. It also means onboarding a new fund in days, not weeks. And when regulators change requirements, the team modifies compliance logic without tearing into monolith code. This isn’t just tech efficiency. It’s business leverage. The Tangible Benefits of Cloud-Native Finance What do cloud-native platforms get that legacy ones don’t? Real-Time Everything. Trades, risk metrics, margin calls, NAV updates – all delivered live, not lagging. Elastic Scaling. Need to process 10x the trade volume next week? Spin up instances, not servers. Modular Change. Want to update P&L logic or introduce a new asset class? Touch one service, not the entire codebase. Auditability by Design. Each event is logged, versioned, and traceable. That makes compliance easier, not harder. Dev Velocity. Push a new feature to a subset of users in production – get feedback, iterate, deploy again. That’s how fintech leaders move. Where to Start: Hybrid by Default Not every firm can go full cloud-native overnight. That’s why hybrid strategies are the norm in 2025: Legacy core systems run in parallel with modern APIs Data is streamed into cloud-native analytics layers (e.g., Snowflake + dbt + Metabase) Client portals are built cloud-first, even if backend logic is still legacy Modern teams design these hybrid bridges with one goal in mind: make migration invisible to end users, but transformational under the hood. You start with client onboarding flows. Then portfolio views. Then risk modeling. Eventually, the core becomes modular enough to replace piece by piece. Don’t Wait for the Rewrite One of the biggest mistakes in financial software is assuming modernization must start with a rewrite. That’s how programs die in planning decks. The real move?