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Modernization of Legacy Trading Platform into Scalable Investment Banking Solution

tallium.com

Financial services

Information technology

eCommerce

Legacy System Limitations

Existing monolithic trading platform suffers from complex user interface causing usability issues, unstable performance with frequent trading disruptions, tightly coupled backend architecture limiting flexibility, inability to integrate modern financial services, and challenges migrating 15,000 existing users to new systems while maintaining data integrity.

About the Client

Leading Swedish brokerage firm specializing in trading, corporate finance, research, asset management, and emission services with 15,000 retail clients and 200 corporate clients

Platform Modernization Goals

Replace legacy backend infrastructure with scalable microservices architecture
Implement intuitive UI/UX design for both novice and professional traders
Integrate 14 third-party financial services and data providers
Ensure seamless migration of 15,000 existing users with zero data loss
Achieve high-performance trading capabilities with minimal latency

Core System Capabilities

Multi-channel trading interface (web/mobile)
Real-time portfolio management dashboard
Automated investment plans and recurring transactions
Secure digital onboarding with BankID integration
Market data visualization with Infront integration
Cross-platform dark mode support
Integrated customer support chat
Document management with SharePoint integration
Multi-currency wallet system
AI-powered investment recommendations

Technology Stack Requirements

Crosskey 1Factor backend solution

React Native for mobile applications

Node.js microservices architecture

AWS cloud infrastructure

GraphQL API layer

MongoDB NoSQL database

Third-Party System Integrations

BankID (digital identification)
Infront (market data)
Morningstar (financial analytics)
Swish (mobile payments)
SPAR (population registry)
OpenAI (AI capabilities)
Zabbix (system monitoring)
Rollbar (error tracking)
Postmark (email services)

System Quality Attributes

99.99% system availability
Sub-50ms trade execution latency
Support for 10,000 concurrent users
GDPR-compliant data handling
Real-time data synchronization
High scalability for future growth

Expected Business Outcomes

Projected 1260+ new user acquisitions through improved UX, 0 support incidents during migration phase, 40% faster onboarding process, 60% reduction in system downtime, and enhanced operational efficiency through integrated compliance and document management systems. Platform modernization enables expansion into new markets with multilingual support and RTL interface capabilities.