Custom Financial Systems Engineering for Citigroup — Softedge Case Study
About the Company
Citigroup is one of the world's largest financial institutions, serving banking and investment clients across the globe. As a tier-1 multinational bank, Citigroup invests heavily in custom engineering to modernize critical internal systems where off-the-shelf software can't satisfy the security, scale, or regulatory bar enterprise-grade financial operations require.
The Challenge
A team inside Citigroup needed to replace a critical financial workflow that had been running on complex Excel spreadsheets for years — manually computing interest allocations, hand-managing audit trails, and producing reports under tight regulatory windows. The Excel-based approach had scale, accuracy, and security limitations that no longer fit Citi's operating bar: manual calculations introduced human-error risk, the workflow couldn't keep pace with growing transaction volume, and storing sensitive financial data in shared spreadsheets created compliance and audit-trail exposure.
Citi needed a custom-engineered platform that would automate the workflow end-to-end while meeting tier-1 bank requirements for security posture, audit logging, role-based access, and regulatory compliance. Given Citi's specific business logic, no off-the-shelf software could satisfy the requirements — the engagement required custom financial software development against the same security and operational bar the rest of Citi's production systems are held to.
Results
Softedge engineered a secure, scalable, cloud-based financial workflow platform on AWS, designed against Citi's enterprise security and compliance posture. The platform replaced the previous Excel-based workflow with an automated, centralized system that handles interest allocation, audit-trail generation, and financial reporting at the bank's transaction scale.
Architecture highlights:
- AWS-native infrastructure with documented data residency and encryption at rest and in transit - Role-based access control aligned with Citi's least-privilege model - Immutable audit logging on every action, designed for the kind of forensic review enterprise auditors actually perform - Automated interest-allocation calculations replacing manual Excel formulas, with deterministic, repeatable outcomes - Real-time financial reporting replacing batched manual exports - Scalability headroom for Citi-scale workloads and future regulatory changes
The system passed Citi's enterprise security review and went into production handling critical financial workflows the team had previously managed by hand. The engagement is referenceable under NDA.
Technologies & Integrations
Transform your financial operations with Softedge
Softedge designs and engineers custom fintech systems for financial institutions and growth-stage fintech startups.
In regulated environments, architecture decisions determine scalability, compliance, and operational predictability.
Whether you're modernizing legacy workflows or building new financial products, we help you architect governed systems built for long-term growth.
