Oksana Tkachenko
I take products from design to production — React/Next.js at the core, AI-powered features built in, not bolted on.
Lately: building AI agents & MCP tools, and playful 3D experiments for the web.
Built in Public
Generative UI Weather Agent
Ask about the weather in plain language. Claude picks a tool, the server fetches real data, and a purpose-built React widget streams into the chat.
- –The model never emits a weather number — it only selects the tool and extracts arguments, and every widget's props are fetched server-side and Zod-validated, so hallucinated data isn't a possible failure.
- –Haiku handles routing by default, and a graded eval suite (25 cases across five intent classes) decides whether it needs escalating to Sonnet.
- –Production guardrails are built in: Redis caching, per-user rate limits, a global daily budget, and Langfuse/OTel tracing.
Zero dependencies React Native paywall open source package
An npm package that lets you update a React Native paywall without shipping an app update.
- –Paywalls are pure data, with no code over the wire and nothing to eval, which keeps them App Store compliant.
- –The fallback chain (fresh → cached → bundled) means users never see a blank screen, and cold-start waits are capped.
- –Zero runtime dependencies, so your purchase stack stays yours.
Latest paywall from the server
Last-known-good, served instantly
Shipped default, never a blank screen
Large-Scale Analytics Dashboard
A data-intensive analytics and threat-monitoring dashboard that stays fast at 170K+ rows.
- –TanStack Table and TanStack Virtual handle windowed, virtualized rendering over 170K+ rows, so the grid never pays for rows that aren't on screen.
- –That density still ships with a 98 Lighthouse performance score, rather than trading rendering speed for a heavier bundle.
- –A daily data refresh runs on Vercel Cron Jobs, keeping the dataset current without any manual pipeline work.
Only the visible window mounts — the rest stays off the DOM
Playground
Glowkin
In active developmentCarve a glowing 3D pumpkin in your browser.
Play🎄 Coming in December
🎆 Coming at the end of December
Selected Projects
Enterprise SSO Authentication
Problem:High-value enterprise sales deals stalled because the core product lacked a secure, compliant single sign-on mechanism to integrate into corporate identity providers.
Solution:Designed and implemented the frontend and Backend-for-Frontend (BFF) architecture for Enterprise SSO using Next.js, NextAuth, and tRPC. Standardized protocol mappings for enterprise tenants.
🚀 Impact: Unlocked enterprise sales from zero by removing a critical enterprise authentication blocker through standards-based SSO (SAML/IdP).
AI-Assisted Code Review
Problem:Peer review turnaround times were a major bottleneck, increasing code delivery cycles and stalling developer productivity.
Solution:Built custom AI workflows and review agents utilizing the Claude API, creating custom LLM prompts and validation routines to automatically pre-screen pull requests before human engineers review them.
🚀 Impact: Reduced peer review turnaround times by approximately 50% while catching structural and security vulnerabilities early in the CI pipeline.
Pricing & Checkout Migration
Problem:Legacy checkout routes running on Blade/PHP suffered from slow loads, poor user retention, and lack of real-time monitoring on critical revenue-driving screens.
Solution:Architected and led migration of pricing and checkout modules to Nuxt.js. Rebuilt the checkout frontend, establishing centralized validation schemas and integrating real-time telemetry with Coralogix.
🚀 Impact: Boosted page load speed by 60% on critical transactional funnels and decreased client-side production errors by 25%.
Before
Laravel monolith
Blade / PHP
PHP backend + DB
Mixed JS / jQuery
Slow SSR, mixed codebase
After
Nuxt.js frontend
Vue 3 / ChargeBee API
REST API
Coralogix observability
+60% load speed, −25% issues
Experience
Creative AI platform for video, music & stock assets · 50M+ creators worldwide
Video templates & assets platform · acquired by Artlist
Digital agency · enterprise dashboards, mobile apps, and web products
Freelance platform · connecting businesses with freelancers worldwide
Digital agency · web development, design, and marketing
About Me
I'm a frontend engineer who thinks in systems. Over the past 7+ years I've built products across digital media, enterprise SaaS, and agency environments - owning everything from revenue-critical checkout flows to Enterprise Lead Qualification and AI-powered engineering workflows.
My comfort zone sits at the intersection of UI and infrastructure: BFF architecture, performance optimization, developer tooling. I like understanding why a product works the way it does, then making it more scalable, maintainable, and easier to evolve.
These days I'm especially interested in how AI is reshaping software engineering, particularly where thoughtful tooling can increase engineering leverage across entire teams.
I believe in complete product ownership - bridging the gap between UI/UX design, business goals, and backend systems to build frontend layers that are resilient, accessible, and effortless to use.
Engineering Philosophy