Ivan Katkov
Selected work/Case 05

Assessment platform · Component engineering · Dec 2020 — Apr 2021

Strengthening a global assessment platform through reusable, accessible UI engineering

I built reusable Svelte components, improved component-testing workflows and supported platform modernization in a high-scale assessment environment.

30M+completed testsPlatform-wide scale context
20+UI componentsReusable product building blocks
A11yquality constraintAccessibility-aware implementation
CASE / 05 SYSTEM ONLINE
TAO Testing · Arcadia Inc.20+ components for a 30M+ assessment ecosystem

IMAGE PLACEHOLDER · Replace through public/images/cases and the case-study data file.

01 · Executive summary

The shortest honest version.

Situation

A global assessment platform needed reusable interface building blocks that remained testable and accessible.

Intervention

I delivered 20+ components, configured component-test processing and supported dependency and Node.js modernization.

Result

Product teams gained more consistent UI primitives and a more dependable path for component testing and maintenance.

02 · Context

Why the engineering work mattered.

TAO supports a global assessment ecosystem with more than 30 million completed tests.

At that scale, small component inconsistencies become repeated product and maintenance costs.

03 · System design

A clear path from signal to production.

01Product need

Assessment workflow requirements.

02UI primitive

Reusable Svelte component contract.

03Test transform

Pre/post-processing for component validation.

04Library

Versioned component-system integration.

05Assessment UI

Consistent experience across product flows.

Constraints that shaped the solution

  • Existing enterprise product behavior.
  • Accessibility requirements.
  • Shared components consumed by multiple workflows.
  • Migration work had to preserve build and test stability.

04 · Decision ledger

The trade-offs behind the implementation.

DecisionReasonTrade-offOutcome
Prefer composable primitives

Assessment flows reused the same interaction patterns in different contexts.

Component APIs required careful boundaries.

More than 20 components could be reused across workflows.

Modernize with tests in the loop

Node and library changes could destabilize shared components.

Migration moved in controlled increments.

Build and test reliability remained the governing constraint.

05 · Change

Before and after.

BeforeRepeated product UI needs

After20+ reusable components

BeforeComplex component-test transforms

AfterConfigured pre/post-processing

BeforeAging runtime dependencies

AfterSupported Node.js and library migration

06 · Outcomes

Technical change translated into team value.

Technical
  • Built 20+ reusable UI components.
  • Improved component-test workflow support.
  • Contributed to accessibility-aware interface delivery and modernization.
Organizational
  • Reduced repeated implementation through shared primitives.
  • Improved maintainability for future product work.
  • Worked within enterprise-grade testing and release constraints.

07 · Evidence boundary

Precise claims build more trust than inflated ones.

  1. 30M+ is platform usage context, not a personal delivery metric.
  2. 20+ refers to components directly developed.
  3. No unsupported conversion or performance claims are made.

08 · Reflection

What the project changed in my engineering judgment.

What worked

Treating component API design and test infrastructure as one concern produced more durable UI building blocks.

What I would improve next

I would add visual regression coverage and explicit accessibility contracts at component level.

What this demonstrates

Component-system engineering in a high-scale, quality-constrained product.

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