Rafał Ileczko

Lead | Senior Software Engineer

E-mail address

Website

Languages

Polish

English - C1

Social links

Summary

Founder, technical lead, and senior fullstack engineer with 11 years of experience in startup environments. I work close to product and care about shipping useful software, keeping systems understandable, and improving both user and developer experience. Comfortable across stacks, with the deepest experience in Clojure(Script), TypeScript, and React. Managed teams of up to 5 developers.

Experience

Senior Fullstack Engineer

Kleene · August 2022 - Present

  • Fullstack
  • Clojure
  • ClojureScript
  • React
  • PostgreSQL
  • ELT
  • AWS
  • Kafka
  • Standardized code and API schemas across the product, reducing bug reports by approximately 15%.
  • Led the development of a design system, cutting the time needed to ship new designs by 30%.
  • Owned features from requirements and design through implementation and release.

Co-Founder / CTO

Maintei · July 2021 - July 2024

  • Fullstack
  • Typescript
  • React
  • PostgreSQL
  • IIoT
  • Supabase
  • Cloud Infrastructure
  • Led the product and engineering work from early concept and feature planning through development, cloud infrastructure, and deployment of 2 fullstack web applications and 1 IoT application.
  • Built a CMMS application focused on equipment uptime, maintenance planning, real-time monitoring, and alerting.
  • Built an IoT platform for remote monitoring of industrial equipment, giving teams better visibility into machine state and operational data.

Lead Frontend Engineer

Retailic · January 2020 - July 2022

  • Tech Leadership
  • Clojure
  • ClojureScript
  • TypeScript
  • React
  • ReactNative
  • Managed a team of 5 developers and led delivery on two large e-commerce projects.
  • Planned a gradual technology-stack migration for a large codebase, avoiding a separate rewrite and finishing with 50% fewer developers and 30% less time than the original plan.
  • Led a design system implementation that reduced development time for new views and components by about 40%.

Senior Frontend Engineer

Retailic · January 2018 - December 2019

  • Clojure
  • ClojureScript
  • Typescript
  • React
  • ReactNative
  • Playwright

Software Engineer

Retailic · August 2016 - December 2017

  • Clojure
  • ClojureScript
  • Python
  • AngularJS

Web developer

Social Karma · October 2015 - July 2016

  • Web design
  • Wordpress
  • Shopify
  • Prestashop

Skills

Programming Languages

JavaScript/TypeScript, Clojure, ClojureScript, HTML, CSS, C#/F#, Python, SQL

Development of business applications

Cypress, Fastify, FastAPI, NextJS, Node.JS, Playwright, PostgreSQL, RadixUI, React, React Native, React Query, Rum/Reagent, Storybook, Styled Components, Supabase, TailwindCSS, tRPC, TanStack, Vite

Others

CI/CD, priority management, software architecture design, team leadership, responsive web design

Education

Computer Science, MSc

Rzeszów University of Technology · 2018 - 2019

Automation and Robotics, BSc

Rzeszów University of Technology · 2014 - 2018