Modernizing an Enterprise Customer Portal with Next.js and a Type Safe API Layer
An enterprise services company relied on a legacy customer portal that was slow, difficult to maintain, and costly to extend. We rebuilt the portal with Next.js, a typed integration layer, and a reusable component system. The result was faster load time, fewer production regressions, and a portal experience customers actually trusted.
Confidential engagement. NDA available upon request.
52%
Faster Page Loads
60%
Fewer UI Defects
2
Releases per Week
14
Weeks to Delivery
About the Client
Industry
Enterprise
Company Size
500 to 900 employees
Background
A services company with a customer portal used by thousands of clients to review invoices, manage service requests, and access documentation. The portal had become a bottleneck for support and renewals.
Challenges Identified
Slow and inconsistent performance
Pages loaded slowly due to heavy client side rendering, duplicated requests, and inconsistent caching.
High change risk
Small changes frequently introduced regressions because the UI layer lacked reusable patterns and tests.
Integration complexity
The portal integrated with multiple internal systems and third party APIs with inconsistent schemas and error handling.
Poor customer experience
Navigation and search did not match real customer workflows, increasing support requests and churn risk.
The Mission
Deliver a modern portal that loads fast, is reliable to change, and integrates cleanly with internal systems while improving customer experience and reducing support load.
How We Approached It
01. Discovery and architecture
Week 1 to 3- Workflow mapping with customer success and support teams
- Performance profiling and bottleneck identification
- API contract review and typed integration design
- Component system plan and accessibility baseline
02. Implementation
Week 4 to 11- Next.js application build with a reusable component library
- TypeScript models for key entities to reduce runtime errors
- Caching strategy and server side rendering for critical pages
- Search improvements and navigation restructuring
03. Hardening and launch
Week 12 to 14- End to end QA for key flows and role based access
- Performance tuning and monitoring dashboards
- Staged rollout and rollback plan
- Documentation and training for internal teams
Vulnerabilities Discovered
0
CRITICAL
2
HIGH
2
MEDIUM
1
LOW
Duplicate data fetch patterns
Multiple pages performed redundant requests and lacked caching, increasing load time and API costs.
Multiple pages performed redundant requests and lacked caching, increasing load time and API costs.
Inconsistent authorization checks in UI flows
Certain navigation paths exposed actions that would later fail due to missing role checks, hurting trust and usability.
Certain navigation paths exposed actions that would later fail due to missing role checks, hurting trust and usability.
Unstructured error handling
Errors from downstream services were not normalized, creating confusing UI states and support tickets.
Errors from downstream services were not normalized, creating confusing UI states and support tickets.
Accessibility gaps in legacy components
Keyboard navigation and focus states were inconsistent across complex tables and forms.
Keyboard navigation and focus states were inconsistent across complex tables and forms.
Design inconsistencies
Legacy pages used one off styling patterns that increased maintenance costs.
Legacy pages used one off styling patterns that increased maintenance costs.
How We Fixed It
Reusable component system
Standardized layout, tables, and forms to reduce duplication and improve UX consistency.
Typed integration layer
Created a stable contract layer with TypeScript models, validation, and normalized errors.
Performance improvements
Implemented server rendering where it mattered, improved caching, and reduced redundant requests.
Measurable Outcomes
The portal became faster and more reliable to change, enabling frequent releases and reducing customer frustration and support load.
52%
Faster Page Loads
60%
Fewer UI Defects
2
Releases per Week
35%
Support Ticket Reduction
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