De-Risking a Mission-Critical Trading Platform: A Phased Migration from AngularJS to Angular
Financial Technology (FinTech)
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$10B+ Client Revenues
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12+ Successful Years
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1000+ IT Ninjas
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5000+ Projects
Client's Testimonial
"Developers.dev provided the perfect blend of legacy system expertise and modern architectural vision. Their phased migration strategy allowed us to de-risk our entire platform without disrupting our advisors' daily workflow. The security and process rigor that came with their CMMI 5 and SOC 2 certifications were critical for getting internal buy-in."
VP of Engineering, SecureWealth Management
Client Overview
An established US-based wealth management firm with over $10B in assets under management. Their core advisory platform, used daily by hundreds of financial advisors, was built on AngularJS 1.5. The platform was stable but slow, difficult to update, and presented a growing compliance risk due to its aging technology stack.
Problem
The client was trapped. The AngularJS platform was the lifeblood of their business, but its technical debt was stifling innovation. A full rewrite was deemed too risky and expensive, but staying on an end-of-life framework was not a viable long-term option. They needed a partner who could ensure business continuity while paving a path to a modern, secure, and scalable future.
Key Challenges
Zero Downtime Requirement
The platform had to remain fully operational for advisors during market hours.
Complex Business Logic
Years of accumulated financial calculations and business rules were deeply embedded in the AngularJS front-end.
Stringent Security & Compliance
The migration had to adhere to strict financial industry regulations and data privacy standards.
Integration with Multiple Systems
The platform was tightly coupled with various internal and third-party financial data APIs.
Our Solution
We proposed and executed a strategic, multi-year "strangler fig" migration, managed by a dedicated POD.
🔒 Stabilize & Secure
Our first step was to take ownership of the existing AngularJS application. We performed a full security audit, patched vulnerabilities, optimized performance, and established a robust CI/CD pipeline for safe, reliable deployments.
🔗 Decouple via an API Layer
We developed a robust API gateway to act as an intermediary between the front-end and the back-end services. This decoupled the UI, making incremental changes possible.
⚛️ Hybrid Application Shell
We created a new Angular application to act as the main "shell." We then used the ngUpgrade library to run the legacy AngularJS application inside the new Angular shell, allowing both frameworks to coexist.
🪜 Incremental Component Migration
We systematically identified and rebuilt individual features-from the login module to complex charting components-as new Angular components, gradually "strangling" the old AngularJS code until it was fully replaced.
Implementation and Execution
Phase 1 (Weeks 1-4)
A dedicated POD of 1 Lead Architect, 3 Senior Angular/AngularJS Developers, 2 QA Automation Engineers, and 1 PM was assigned.
Phase 2 (Weeks 5-12)
The engagement began with a 2-week paid trial to audit the code and present the final strategic roadmap.
Phase 3 (Weeks 13-18)
We established a mirrored staging environment for rigorous testing of the hybrid application.
Phase 4 (Weeks 19-22)
Daily stand-ups and weekly demos were conducted via MS Teams to ensure full transparency.
Phase 5 (Week 23)
Jira was used for sprint planning and progress tracking, giving the client real-time visibility.
Phase 6 (Week 24)
Each migrated component was pushed through a multi-stage QA process, including unit, integration, and regression testing, before being released to production.
Positive Outcome
🚫 Zero Business Disruption
The client experienced zero downtime throughout the 18-month migration process.
⚡ 60% Improvement in Performance
The new Angular components led to a significant decrease in load times and a more responsive user interface.
🛡️ Enhanced Security & Compliance
The modernized platform met all current security standards, simplifying compliance audits.
🚀 Accelerated Feature Development
With the new Angular architecture, the client's in-house team can now develop and deploy new features 3x faster.
Why Choose Us
💡 Pragmatic Modernization
We provided a real-world solution, not a risky academic one.
📈 Process Maturity
Our CMMI 5 and SOC 2 certifications were key differentiators.
🤝 In-House Experts
Our stable, experienced team ensured consistent quality.
✅ Full Lifecycle Ownership
We managed the entire process from audit to final deployment.
👍 Zero-Risk Talent
Our trial period and replacement guarantee gave the client confidence.
🔐 Ironclad IP Protection
All new code and IP were fully transferred to the client.
🌐 Global Delivery Model
We provided top-tier talent with significant cost advantages.
🤖 AI-Augmented QA
AI tools were used to increase test coverage and catch regressions.
🧠 Deep Domain Experience
Our understanding of the FinTech space was crucial.
Conclusion
By choosing a strategic partner focused on pragmatic, de-risked migration over a high-risk rewrite, the client successfully modernized their core platform, reduced business risk, and created a foundation for future innovation, all without disrupting their critical day-to-day operations.