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GregoryKolens.

Senior / Lead Software Engineer

AI platforms and full-stack products, built on 10+ years of enterprise engineering. I design React application architecture and build AI products and developer tools with TypeScript and Node.js.

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PRAGUE, CZECHIAAVAILABLE FOR SELECT WORK
SUBJECT / GK-13Illustrated full-length portrait of Gregory Kolens as a night stewardENGINEER / BUILDER / 10+ YRS
10+Years in production
AI × WEBEnd-to-end products
ENTERPRISEInsurance & banking
PRAGUEBased in Czechia
EXPERTISE

What I bring to the table

Hands-on architecture, implementation and mentoring across enterprise applications, AI integrations and developer tooling.

AI platforms & developer tools

LLM integrations, AI-assisted testing, model evaluation, observability, and Office automation for enterprise products.

  • TYPESCRIPT
  • MCP
  • PLAYWRIGHT
  • OFFICE.JS

Full-stack engineering

React application architecture, micro-frontends, typed API contracts, and full-stack features across insurance, banking, and AI products.

  • REACT
  • NEXT.JS
  • NODE.JS
  • SPRING BOOT

Technical leadership

Architecture, mentoring, delivery planning, and cross-functional product decisions grounded in more than a decade of practice.

  • ARCHITECTURE
  • PRODUCT
  • MENTORING
EXPERIENCE

Professional experience

Parallel work across insurance platforms and enterprise AI products, from application architecture to implementation.

AUG 2023 — SEP 2026

Frontend Developer → Full-Stack Developer

Kooperativa pojišťovna (VIG)

Designed the React application architecture for the Neuron Policy domain from the start, working in a small team on insurance-contract lifecycle management for Kooperativa and ČPP. Developed policy search, cancellation and signing workflows, Tasklist micro-frontends, and full-stack features with Java and Spring Boot.

OCT 2021 — SEP 2026

Senior Technical Lead, AI Engineer

PwC

Led engineering across financial, tax and AI products, including a React and Nx platform with 21 AI micro-frontends. Created and led Specwright, combining source-code analysis, browser automation and LLM integrations to generate deterministic Playwright tests. Principal developer of an AI-powered Excel and PowerPoint add-in using Office.js.

Earlier chapters include senior engineering and leadership roles at Shoptet, Creative Dock, Home Credit International, DHL IT Services, CEMEX / NEORIS, and KESSO.

PROJECTS

What I’m working on

Local-first CAD, mutation testing and AI-powered real-estate workflows.

VibeShape

Local-first browser CAD for designing parts for 3D printing. Building parametric modeling, exact solid geometry, printability checks, STEP / STL / 3MF export, and MCP tools for AI-assisted modeling.

  • TYPESCRIPT
  • CAD
  • WEBASSEMBLY
  • MCP
  • 3D PRINTING
VibeShape on GitHub ↗

Stryker Mutator Rust

Rust-backed mutation testing for JavaScript and TypeScript. Developing native instrumentation and test orchestration, with a StrykerJS compatibility path for unsupported syntax. Currently in preview.

  • RUST
  • TYPESCRIPT
  • NODE-API
  • BUN
  • MUTATION TESTING
Stryker Mutator Rust on GitHub ↗

Dealyv

AI real-estate platform. Contribute to architecture and implementation of lead qualification and follow-up workflows, with model evaluation, observability and scheduled agents.

  • TYPESCRIPT
  • NEXT.JS
  • VERCEL AI SDK
  • LANGFUSE
  • CLOUDFLARE
  • tRPC
  • POSTGRESQL / NEON

Earlier projects include Hey Foods, an AI restaurant-review analysis tool, and Honeywell Safety Console and PNP, web and mobile applications for industrial hearing protection.

BACKGROUND

Education & resume

Two-page resumes with professional experience, selected projects and technical skills.

Yandex Practicum — Data Science Extended, Sep 2024–2025 (completed).
VSO in Prague — IT in Tourism, 2014–2015.
CVUT in Prague — IT Development, 2010–2013.
Languages: Russian — Native; English — B2; Czech — B2.

Professional CV (PDF)
OPEN SOURCE SIGNAL

Small tools. Sharp edges removed.

worker-batcherControlled concurrencyreact-slot-componentType-safe React slotsformik-persist-valuesPersistent form state
NEXT TRANSMISSION

Building something difficult?

Let’s turn it into a system that works beyond the demo.

LinkedIn ↗