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Vladyslav Len

PROFILE

Vladyslav Len

Vladislavs Len developed robust data and payment features across SchematicHQ/schematic-js and redpanda-data/connect, focusing on real-time data ingestion, pricing, and checkout flows. He engineered a PostgreSQL Change Data Capture plugin using Go, enabling logical replication and initial snapshotting for low-latency analytics. On the front end, he enhanced React and TypeScript components to support tiered pricing, tax-aware checkout, and 3D Secure payments, integrating Stripe for secure transactions. His work included precise UI state management and internationalization, ensuring accurate pricing and compliance. The solutions demonstrated depth in system design, cross-component data alignment, and improved reliability for both data pipelines and billing.

Overall Statistics

Feature vs Bugs

77%Features

Repository Contributions

14Total
Bugs
3
Commits
14
Features
10
Lines of code
8,157
Activity Months5

Work History

September 2025

3 Commits • 3 Features

Sep 1, 2025

Sep 2025 highlights for SchematicHQ/schematic-js: Implemented a memoized discountApplied flag to conditionally render the promo-code UI, ensuring the promo-code section is hidden when there is no valid discount (reducing UI noise and potential confusion). Added Tax-Aware Checkout Enhancements to dynamically determine if billing address is required and to accurately display tax details in the sidebar, improving compliance and checkout accuracy. Integrated 3D Secure (3DS) payments via Stripe, with handlers for payment intents requiring additional authentication and UI state feedback to secure the checkout flow. Major bug fix: ensure promo-code UI visibility aligns with discount validity to prevent misapplication. These changes improve conversion, compliance, and security, and demonstrate proficiency in UI state management, Stripe integration, and tax/checkout logic.

July 2025

3 Commits • 2 Features

Jul 1, 2025

Concise monthly summary for 2025-07 focusing on key accomplishments for the SchematicHQ/schematic-js project. Highlights include delivering Stripe integration key migration and initialization enhancements, fixing publishable key correctness when a Stripe account ID is present, and releasing an OpenAPI types update for the components library. These efforts improve payment reliability, multi-account handling readiness, and downstream integration with updated typings.

April 2025

2 Commits • 1 Features

Apr 1, 2025

April 2025 monthly summary for SchematicHQ/schematic-js focusing on pricing and billing improvements. Key features delivered include the Billing Overage Pricing Enhancements, which implement tiered overage pricing by deriving the overage price from the last tier in the product price tier array and introduce a packageSize in billing models to support the new pricing logic. This work lays the groundwork for more accurate, scalable pricing across usage-based plans. Major bugs fixed include the Overage Pricing Display Bug Fix in Subscriptions, correcting the display and calculation by deriving the overage price from the subscription object and ensuring the correct product, price, and currency are used for usage-based pricing tiers. Overall impact includes improved pricing accuracy, revenue integrity, and customer transparency, with reduced risk of misbilling. Technologies and skills demonstrated include tiered pricing calculations, billing model augmentation, and precise data mapping between products, prices, and currencies across the subscriptions domain. Highlights tie to commits: bf56708b19348d09826a637ad9711b1a3d0dac28 and 7efb8e7cc32a58c20ac3345576c6b80c2d87b02c.

February 2025

5 Commits • 3 Features

Feb 1, 2025

February 2025 performance summary for SchematicHQ/schematic-js. Focused on pricing UX improvements, support for custom pricing, and release hygiene. Key features delivered include: (1) Pricing Currency Display Enhancements—currency symbol and code are now accurate across the app; formatCurrency refactored to accept a currency parameter and applied broadly (commit 848357310e3ce1f72c625e2890faf1b5825f2ce9). (2) Custom Pricing Plans—added data models and UI updates for custom plans (PricingTable and CheckoutDialog) and adapted checkout flow to support custom plan selections (commits 405de8b673eca6770ad60a08b2148ca092f7859c and f791dffdeb9373321f5806952ea81356714ec3d9). (3) Release Version Bump—version increment for release management (commit 908604c6a3ce2feb15ce8629293d77b5ad26c8af). Major bug fixed: Custom Plans Checkout Not Disabled Bug Fix—ensured disabled state correctly handles custom plans in pricing table and checkout dialog to preserve expected user flow (commit 283b6022dd6ec398d35281edaaf9a82c4c3e497d). Overall impact: Achieved accurate pricing representation, enabled flexible pricing strategies with new custom plans, corrected edge-case UX flows, and improved release readiness. This work enhances revenue clarity, reduces checkout friction for custom plans, and strengthens the front-end architecture around pricing modules. Technologies/skills demonstrated: Front-end React/TypeScript UI updates, data-model enhancements, UI component refactoring (PricingTable, CheckoutDialog), cross-component currency handling, and disciplined version control practices.

November 2024

1 Commits • 1 Features

Nov 1, 2024

November 2024 monthly summary for redpanda-data/connect. Focused on delivering a high-impact feature to expand real-time data ingestion capabilities, with minimal documented bug fixes in this period. Key features delivered: - PostgreSQL CDC Plugin for Connect System: Implemented a plugin enabling streaming of data changes via logical replication with initial snapshotting. The plugin supports multiple PostgreSQL versions and configurations, broadening deployment options for PostgreSQL sources. Major bugs fixed: - No major bugs documented for this period in the provided data. The primary focus was feature delivery and integration stabilization of the CDC path. Overall impact and accomplishments: - Enables near real-time data ingestion from PostgreSQL sources, reducing latency in downstream analytics and data pipelines. - Strengthens data reliability and consistency in change-data-capture workflows through initial snapshotting and logical replication. - Extends Connect’s data integration capabilities, enabling broader use cases and faster time-to-value for data teams. Technologies/skills demonstrated: - PostgreSQL logical replication, change data capture (CDC), initial snapshotting, and multi-version compatibility. - Plugin development within the Connect framework and integration with the redpanda-data/connect repository. - Git-based workflow and change tracking, with a specific focus on the PostgreSQL CDC plugin (commit 5f28795096ef2f09b6260962f20f6ee375d2da27).

Activity

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Quality Metrics

Correctness87.8%
Maintainability84.2%
Architecture84.2%
Performance80.8%
AI Usage27.2%

Skills & Technologies

Programming Languages

AsciiDocGoJavaScriptTypeScript

Technical Skills

API IntegrationChange Data Capture (CDC)Database IntegrationFront End DevelopmentFrontend DevelopmentGo ProgrammingInternationalizationJavaScriptLogical ReplicationPayment ProcessingPostgreSQLReactState ManagementStripe IntegrationSystem Design

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

SchematicHQ/schematic-js

Feb 2025 Sep 2025
4 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

API IntegrationFrontend DevelopmentInternationalizationJavaScriptReactTypeScript

redpanda-data/connect

Nov 2024 Nov 2024
1 Month active

Languages Used

AsciiDocGo

Technical Skills

Change Data Capture (CDC)Database IntegrationGo ProgrammingLogical ReplicationPostgreSQLSystem Design

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