Alex Berezinsky

Experience

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  Business and private clients

  Aug 2009 - Sept 2013

  Freelance Software Developer

  • Worked as a freelancer during my studies and afterwards on dozens of various projects (mostly PHP and MySQL)• Working with private and corporate clients

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  Lidor Logistics

  Sept 2013 - May 2015

  Senior PHP Developer

  • Main developer for company’s website, logistic and CRM systems• Created a global website, usaddress.com, and integrated it with existing systems• Collaborated with CEO and logistic manager of the company• Conducted job interviews and later led a team of two developers.

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  Bobile

  Aug 2015 - Jul 2016

  Senior PHP Developer

  • Initiated rewriting of the whole platform, created new system architecture, applied OOP and MVC principles• Database and SQL queries optimisation• Worked directly with CEO and CTO of the startup

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  Wayfair

  Feb 2017 - Dec 2018

  Software Engineer L2

  • Worked on various PHP-based logistic systems, tools for suppliers and carriers, new carrier integrations via API and more.• Initiated a creation of a tool for debugging production issues on dev environment, by identifying and importing relevant data to dev DB

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  Urban Sports GmbH

  Apr 2019 - Dec 2020

  Software Engineer

  • Worked on a PHP-based system in different teams and various projects: platform, bookings, checkins, payments, invoice, timezones integration, data migration, code refactoring, performance tuning• Optimised API latency (60% reduction) for the most used endpoint• Expanded an open source PHP library, Spot ORM, to support multi-level relations• Android app development with React Native. Added new features, unit/integration tests, bugs fixing

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  Heydoc

  Mar 2021 - Dec 2021

  Senior Software Engineer

  • Worked on a SaaS system based on MongoDB, Express.js, React.js and Node.js (MERN)• Found logic and security flaws and initiated big scale refactoring projects• Integrated Stripe Express payments

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  Booking.com

  Mar 2022 - Mar 2024

  Software Engineer II

  • Writing high-quality OOP code in Java and Perl in large-scale microservices environment. Unit/integration tests, code reviews, conducting presentations and design sessions, collaborating with other teams on cross-team projects, tweaking Kubernetes, contributing to documentation and wiki pages, onboarding newcomers and many other tasks.• Marketing department: worked on a high-load system which controls the incentive campaigns of the company. Initiated optimisations which resulted in a significant impact.• Monetisation department: worked on a high-load Java service which is crucial for commission calculation.• Took part in 2 Hackathons as a team lead, conducted research and built prototypes for my ideas. Show less

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  Self-employed

  Jul 2024 - now

  Freelance Senior Software Engineer

  Working as a freelancer during my Master's studies