Paweł Warczyński Email & Phone Number

# 2023 Project "New favourites in Allegro"# 2020 - 2023 I highly involved in the mid/end year performance process. I was initiator and then coordinator work on the RATE project. In 2023, the majority of people in technology at Allegro were evaluated with the use of this tool. RATE (framework) allows comprehensively describe engineer’s work, collect feedback, based on the data carry out calibrations of up to 150 people.# 2022 The best-rated presentation "It’s high time to open the time capsule that was closed 10 years ago!" at two days Allegro Tech Meeting conference. # Allegro Tech Hero 2021- awarded by people from Allegro# Consumer BU Game Changer 2020 - awarded by people from Consumer Business Area# 2018 - 2020 The best-rated training “GIT beasts” on an internal learning platform MindUp for employees.Despite being very involved in the company's processes or being a Allegro trainer, I am still the most proud of the Chomsky team. Great engineers but most of all great people.Main technologies:- Backend: Kotlin/Java- A few features in the Android app and on the Web- MongoDB to handle thousands of requests per second- Microservices + event-driven architectures

Time to change! I moved to the Offer Selection Team. I am responsible for the search engine, the suggester and offer listings. Technologies: • big data: hadoop, Hive, ...• Apache Solr• many (micro)-services providing business logic• a pinch of machine learning• and Clojure & Kotlin for fun

# I created a new REST Allegro API dedicated for ERP systems (Enterprise resource planning). Technologies & keywords:• A few RESTful web service written in JAVA & Groovy• One legacy PHP service with SOAP API• Heavily used Spring framework (Core, Spring Boot, Spring Data)• Databases: MySQL, MongoDB• Testing: SPOCK, Mockito, WireMock• TIBCO used as a middleware between integrated systems• External clients authentication via x509 certificates• Own Certificate Authority service (CA) for signing clients certificates# Allegro Sales Manager - new JAVA backend. Technology stack similar to the previous project.# Allegro place for brands (http://allegro.pl/strefamarek): maintenance legacy PHP application and support migration process to new platform. Mostly I was involved in: • preparing applications for Christmas traffic• increasing stability• taking care of a migration processRoles:* Software developer* Team leader responsible for a whole development process* For one year I was also responsible for Technical Support team

I developed the new Allegro web application “Sales Manager” from scratch (ms.allegro.pl). It is a highly scalable project with:• data sharding and caching • handling asynchronous tasks by a dedicated system called “Scheduler” (I was a designer and a main developer of this system)• integration with a few external systems via SOAP and REST: Allegro, iStore, central storehouse systemMy additional role in team was “Database Manager”. I took care of all changes introduced to database, made sure that everything connected with DB worked and minimized chances of possible future failures.

I have created and conducted workshops on topics: Java, NoSQL, and related technologies. Recipients of the training - people who have the ambition to change something in their lives and start programming! I sincerely wish them good luck!

PHP and JavaScript Developer in international projects:• www.ibood.com - Europe's biggest one-day deal platform.• unitedmonkies.nl - Platform for stock exchange investors.I was responsible for developing applications in many ways:• designing and creating a few core functionalities (like routing)• optimizing frontend (minimizing requests overhead, introducing ETAG, optimizing page rendering)• improving page scalability (caching data, finding bottlenecks)• taking care of database (master – slave replication, SQL query analysis)• writing nginx rules• extending Symfony framework functionality

Working on a highly scalable and secure system for accepting and handling brokers’ orders. This project allowed me to:• get knowledge of J2EE application architecture • use object-oriented programming in a well-designed application• learn EJB, Hibernate, Spring technologies• learn many good programming practices

Master Of Science (Msc), Computer Science, Computer Scientist

Bachelor Of Science (Bsc), Computer Science, Computing Science

Postgraduate, Project Management

Education record