$ whoami
krystian.gwizdala — 10+ yrs · typescript · angular · node · blockchain

// profile

Product-minded engineer with 10+ years of experience delivering web products end-to-end across frontend and backend. Strong in TypeScript, Angular, Node.js, API integrations, and blockchain-related products.

// experience

TestGorilla

jan 2023 — present

senior frontend developer

Hiring and talent assessment platform for modern recruitment teams.

  • Delivered product features in a large Angular/TypeScript codebase with strict CI quality standards.
  • Implemented AI interviews in the candidate screening process.
  • Actively used modern AI tools in daily delivery: GitHub Copilot, Claude Code, OpenClaw Local Agent.

Cisco

feb 2016 — apr 2026

fullstack javascript developer

Global networking and enterprise infrastructure technology company.

  • Built backend services with Node.js/Express, Oracle SQL, Redis, and WebSockets.
  • Developed data-heavy Angular applications and visual workflows.

Xtrades

jan 2022 — jan 2023

senior frontend developer

Trading education and market insights platform for active retail investors.

  • Built and maintained web/mobile product using Angular, Ionic, NgRx, RxJS, and TypeScript.
  • Improved performance and loading time across key user flows.

HTD Health

sep 2018 — jan 2022

fullstack javascript developer

Digital health product studio building software for healthcare providers.

  • Built backend services with Node.js, AWS Lambda, MySQL, and TypeORM.
  • Delivered web/mobile products with Angular and Ionic.

Filestack (formerly Filepicker)

mar 2014 — feb 2016

software engineer

Developer platform for file upload, processing, and delivery APIs.

  • Built new filepicker dialog UI as SPA (AngularJS) and contributed to API-facing functionality.
  • Rebuilt JavaScript API library and added new upload workflow capabilities.
  • Worked on AWS services: EC2, API Gateway, S3, and CloudFront.

// selected-project

Blockchain Transaction Monitor & Arbitrage Platform

personal · 3 yrs

end-to-end design, build, ops

  • Built and maintained a private arbitrage platform with exchange integrations, automation, and reliability controls.
  • Included blockchain transaction monitoring as part of the platform.
  • Configured OpenClaw Local AI agent for system monitoring and continuous improvement.