Adrian Chrobak

Backend • Warsaw, Poland • UTC+01:00 • Work permits: Poland • English: C1 • Available in 2 weeks

Software Developer

9+ years exp

Ruby

SQL

Node JS

JavaScript

TypeScript

Active 1 day ago

+48 (794) 122580

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Overview

Technical skills

Timeline

Roles

Overview

Software engineer with about 8 years of experience building web applications using Ruby on Rails, React, and TypeScript. Works extensively with PostgreSQL, SQL performance tuning, and unit/integration testing with RSpec to deliver maintainable and reliable features. Has experience designing REST APIs, improving backend performance, and refactoring legacy Rails services into microservices while mentoring teammates.

Technical skills

Ruby

SQL

Node JS

JavaScript• Middle • 9y+

TypeScript• Senior • 5y+

Ruby

Capybara

Factory Bot

RSpec• 9y+

Ruby on Rails• 9y+

Node JS

Prisma

Databases

MySQL

Redis

PostgreSQL• 9y+

Frontend

GraphQL

React.js• 9y+

DevOps

CI/CD

Heroku

Git• 9y+

AWS• 5y+

Docker• 5y+

Rest API• 5y+

Jest

Timeline

Senior Software Engineer • Senior

Sii Poland • Full-Time

Oct 2021 to Present 4 Years 10 Months Brzeg Partially remote

Engineered full-stack features using Ruby on Rails, React, and TypeScript with a strong focus on object-oriented design and relational databases. Built and integrated REST APIs for mobile and external consumers, and improved reliability through thorough unit and integration testing with RSpec. Optimized database performance by refining data models and adding indexes, and contributed to refactoring legacy Rails services into microservices for better maintainability and independent scaling. Mentored junior engineers and led feature architecture with product and design partners, maintaining high code quality via reviews.

Ruby on Rails

React.js

TypeScript

PostgreSQL

RSpec

Git

Docker

AWS

Rest API

Senior Software Engineer • Senior

Polcode • Full-Time

Apr 2021 to Sep 2021 5 Months Warsaw In office

Designed and implemented backend services with Ruby on Rails and PostgreSQL for client-facing applications, ensuring data integrity and high availability. Improved performance by analyzing query execution plans and applying database indexing, reducing response times and enhancing user experience. Wrote unit and integration tests using RSpec and collaborated with frontend developers to integrate React components with Rails APIs, maintaining consistent behavior across the stack.

Ruby on Rails

React.js

PostgreSQL

RSpec

Git

Dockersince 2021

Software Engineer • Middle

OPGK Software • Full-Time

Dec 2017 to Mar 2021 3 Years 3 Months Warsaw In office

Developed and maintained web applications using Ruby on Rails and JavaScript, delivering client requirements and maintaining code quality. Modeled relational data in PostgreSQL, optimized SQL queries for growing datasets, and used unit testing and peer reviews to support stable releases. Integrated third-party APIs with proper error handling, and automated repetitive work via scripts and background jobs to improve team efficiency.

Ruby on Railssince 2017

JavaScript

PostgreSQLsince 2017

RSpecsince 2017

Gitsince 2017

React.jssince 2017