Mateusz Ratajski Email & Phone Number

Łódź, Pl

Warsaw, Mazowieckie, Poland

Mytherapy Data Team+ Data Lake Orchestration and Maintenance (Python, Stepfunctions, Batch, Athena, S3, Quicksight)+ Automate CI/CD of Data Lake infrastructure and code (Terraform, Cloudformation, Make)+ Introduce Kimbal DWH Model with DBT (DBTCore, Athena, Github Workflows)+ Big Data ingest and transformation (Glue, pyspark)

Lodz, Lodz District, Poland

Citi - SES DW+ Automate manual ETL processes (Python/MsSQL/Flask/Marshmallow)+ Automate report generation (Pandas/Plotly/Reportlab)+ Prepare refactoring plan for data import and aggregation (Python/Airflow)CB+ Maintain and develop web scrappers (BS4/Marshmallow/Selenium)+ Verify and fix NLP Model (MongoDB/Python)+ Prepare refactoring plan and testing environment (Prefect/Docker/Bash)IA+ Implementing, optimizing, maintaining and testing data science models (Python, PostgreSQL, AWS Cloudformation)+ Orchestrating ETL process (AWS Batch, S3, ActiveMQ, DynamoDB)+ Delivering data science results with REST API, GraphQL and Messaging (AWS Lambda, ApiGateway, Hasura, ActiveMQ, Solace)

Lodz, Lodz District, Poland

Exp.pl is a privately owned company focused on providing dedicated software solutions for other companies. The flagship product of Exp.pl is REIM which is a multi-tenant support system focused on mobile telephony agencies. As a principal software developer I was responsible for:+ organizing and supervising the development process+ making architectural decissions for expansion of the existing software+ analyzing customer requirements and providing business solutions+ maintaining server infrastructure.Significant achievements:+ ERP module with GUI configured workflows, forms, transitions, documents, reports, permissions+ commercial and warehouse module with b2b transactions (PostgreSQL, PlSQL, AngularJS)+ built-in documentation system for customers with permission and app configuration layer (Php, HTML, \LaTeX)+ multicurrency financial module with b2b settlement transfers (Php, PlSQL)+ implementing responsive interface (AngularJS, SCSS, flex)+ Migration from Microsoft Exchange to internal helpdesk system (Php, AngularJS) + Linux Cluster with multinode and High Availability (RHCS, gfs, pgpool, nginx, stunnel, haproxy, flask)+ implementing JIRA/Confluence for internal communication (Jira, Php, Python)+ talesales system with realtime interface for customers with telephone exchange support (python, jquery, php)+ Online receipt printing system for customers with .net client (server side)+ reimbursement module (postgresql, plpythonu)+ core engine for application including permissions, routing, form validation+ migrating of various versions of legacy code into one with configuration layer + Multiple projects involving postresql, php (yii, laravel, symfony), python (django, flask), linux, freebsd etc

Poland

+ badtaste.pl - Webshop and board for music label (2004-7)+ owned.pl - CMS and board for gaming vortal (2005-6)+ xg.pl - CMS and board for gaming vortal (2002-4)+ q3arena.gry.wp.pl - CMS for quake3 community portal (2002)