Radosław Kłos

Experience

1. 2025 — Now

   SoftwareMill / Senior Software Engineer

   Currently at NinjaTrader (Chicago)

   Working on a high-traffic trading platform. Shipped a personalised insights feature that turns each trader's trading history in BigQuery into actionable feedback, moved a storage layer onto Cloudflare R2, and integrated an external CMS into the educational product.

   Node.js · NestJS · React · GCP · Terraform · Cloudflare R2

2. 2018 — 2025

   Wirtualna Polska / Fullstack Developer → Team Leader

   Led a team of four building back-office systems behind thousands of ad campaigns worth millions of PLN. Built the campaign management front-end from scratch and designed a small internal language for ad targeting.

   TypeScript · Vue · React · Node.js · Python · Django · Docker

3. 2017 — 2018

   Fotka.pl / Junior Fullstack Developer

   Worked on a social network with thousands of concurrent users. Built a dynamic thumbnail generation system for live video broadcasts and implemented an integration that synced user accounts with their Instagram profiles.

   Node.js · PHP · jQuery · MySQL · Redis

Skills

Core

TypeScript · JavaScript · Vue · React · Svelte · Node.js

Backend

NestJS · Express · PostgreSQL · MongoDB · Redis

Platform

Docker · GCP · Cloudflare · GitHub Actions · Terraform

Education