API Portal

Boosting Developer Velocity

Enhanced Kyivstar's API Portal with features, significantly boosting developer experience (DX). These improvements directly supported a 20% quarterly revenue increase from API products.

Challenge

After successfully launching the API Portal MVP that reduced onboarding from 6+ months to minutes, we faced new challenges as our user base grew:

  • Limited Developer Tooling: Basic documentation wasn't enough for efficient API integration
  • Lack of Usage Transparency: Business stakeholders needed better visibility into API consumption and costs
  • Complex Integration Friction: Advanced use cases required more sophisticated support
  • Revenue Growth Goals: The business needed to accelerate API product adoption and usage

My Strategic Approach

As Senior Product Designer, I focused on enhancing developer experience (DX) through targeted, high-impact features:

1. Interactive API Documentation & Testing

This application was designed for the Ukrainian market. The following mockups show the interface translated into English for clarity

User Need: Developers were using external tools like Postman for testing, creating friction in their workflow.

Design Solution:

  • Embedded "Send Request" functionality directly within documentation
  • Real-time request/response visualization using users' own API keys
  • Multi-language code snippets for instant implementation
  • Syntax-highlighted response formatting with expandable nodes

Design Decision: I prioritized in-context testing over more comprehensive standalone tools, as our research showed context-switching was a major integration bottleneck.

2. Data-Driven Analytics Dashboard

This application was designed for the Ukrainian market. The following mockups show the interface translated into English for clarity

User Need: Business stakeholders lacked visibility into API usage patterns and associated costs.

Design Solution:

  • At-a-glance overview showing key metrics (calls, success rates, costs)
  • Detailed API usage statistics with filtering by product, status codes, and time periods
  • Visual trends and anomaly indicators for proactive issue identification
  • Cost forecasting based on current usage patterns

Technical Consideration: I leveraged my front-end knowledge to design visualization components that balanced performance with information density.

3. Streamlined Webhook Management

This application was designed for the Ukrainian market. The following mockups show the interface translated into English for clarity

User Need: Developers struggled to configure real-time event notifications crucial for reliable messaging.

Design Solution:

  • Intuitive webhook configuration interface
  • Real-time testing and validation of webhook endpoints
  • Detailed delivery logs with error diagnostics
  • Templated configurations for common integration patterns

Design Decision: I created a visual webhook flow diagram that helped technical and non-technical stakeholders understand the event flow, bridging communication gaps between teams.

Impact

The enhanced portal directly contributed to business growth and developer productivity:

  • 20% Quarterly Revenue Growth for API products
  • Integration Time Reduced from days/weeks to hours
  • Developer Satisfaction Improvement with higher self-service rates
  • Support Ticket Reduction for routine configuration tasks

Key Insights

  • Developer Experience Drives Business Growth: Making developers successful is a direct path to increased product adoption and revenue.

  • Strategic Feature Prioritization: By focusing on the highest-friction points in the developer journey (testing, monitoring, event handling), we delivered outsized impact with limited resources.

  • Technical Background as Design Advantage: My front-end development experience enabled me to design solutions that balanced technical constraints with optimal user experience.

  • Self-Service as Strategy: Empowering users with robust self-service capabilities not only reduced support costs but also increased user satisfaction and platform stickiness.

This evolution transformed the API Portal from a basic access point to a comprehensive developer success platform that directly contributed to business growth.