Oleg is available for hire

Oleg Schalginski

Verified Expert in Engineering

Software Developer

Dortmund, North Rhine-Westphalia, Germany

Toptal member since February 16, 2022

Expertise

PHP JavaScript MySQL Database Architecture React Redux Front-end WebSockets Amazon API Gateway PostgreSQL .NET CSS REST APIs jQuery PL/SQL MS SQL Uber Symfony

Bio

Oleg is a software developer with over 20 years of experience automating business processes for various industries, including construction, finance, energy, telecom, and government. He has experience using various technologies, including JavaScript, TypeScript, PHP, MySQL, Oracle, Redis, and DynamoDB for storage, as well as frameworks, including .NET, Symfony, React, and Redux. Oleg's goal remains constant—to deliver uber-flexible, user-friendly interfaces that meet business needs.

Portfolio

Digital Places, LLC

PHP, React, Amazon Web Services (AWS), PostgreSQL, Laravel, Docker, Next.js...

Oxtech LTD

PHP, Symfony, Docker, Kubernetes, Redis, RabbitMQ, React, Microservices, APIs...

The ZYX Integrated Technologies

PHP, Symfony, React, TypeScript, MySQL, Microsoft SQL Server, Docker, DocuSign...

Experience

JavaScript - 20 years PHP - 20 years MySQL - 20 years React - 6 years Symfony - 5 years Node.js - 5 years Amazon Web Services (AWS) - 3 years TypeScript - 3 years

Availability

Part-time

Preferred Environment

Unix, Linux, MacOS, Windows

The most amazing...

...project I've worked on impacted approximately a third of my country's population of about 50 million.

Work Experience

PHP Developer

2022 - PRESENT

Digital Places, LLC

Moved the entire project to the new UX, including back compatibility.
Refactored and implemented new business processes, including front and back end.
Created a new 3D model file processing system design and implementation.
Integrated Shopify to a VR environment through an API to allow the placement of goods right in experience.

Technologies: PHP, React, Amazon Web Services (AWS), PostgreSQL, Laravel, Docker, Next.js, APIs, Python 3, C++, 3D, Three.js, Amazon S3 (AWS S3), SCSS, API Integration, Redis, SQL, HTML, CSS, Python, REST APIs, WebSockets, Front-end, Shopify

Games Processing Team Lead

2021 - 2023

Oxtech LTD

Developed a microservice architecture for processing games, serving millions of players.
Optimized the code and data structure to improve performance, which allows processing of several hundred million transactions per month.
Created the original game provider service to work with dozens of external aggregators, allowing the unification of numerous interfaces, reduction of code maintenance costs, and significant improvement of the quality and stability of performance.

Technologies: PHP, Symfony, Docker, Kubernetes, Redis, RabbitMQ, React, Microservices, APIs, SQL, High-load, Performance, SQL Performance, PHP Performance, Swoole, PHP Standards Recommendations (PSR), Sharding, Indexing, Caching, API Integration, HTML, CSS, Python, Python 3, REST APIs, WebSockets, Database Architecture, Software Architecture, Technical Leadership

Full-stack Developer

2022 - 2022

The ZYX Integrated Technologies

Developed analytics reports (front and back end) based on two database instances (MySQL and Microsoft SQL Server).
Created a digitalized application form processing with DocuSign and external credit report services integration.
Built extensions for payment processes and data processing.

Technologies: PHP, Symfony, React, TypeScript, MySQL, Microsoft SQL Server, Docker, DocuSign, APIs, SQL, API Integration, HTML, CSS, REST APIs, Front-end, BrainTree, Payment APIs, Card Payments, Business Reporting

Tech Lead

2017 - 2020

Alar

Developed a corporate information system that could be integrated with BIM, document flows, workflows, and financial items.
Built integrated solutions for specific third-party software aimed at the construction industry.
Created report systems based on face/finger recognition solutions for site management.

Technologies: JavaScript, React, PHP, MySQL, TypeScript, Symfony, Amazon Web Services (AWS), Kubernetes, Docker, Node.js, AWS Amplify, Amazon DynamoDB, AWS Lambda, Amazon API Gateway, REST, Redux, API Integration, SQL, HTML, CSS, Python, Python 3, REST APIs, WebSockets, Front-end

Head of the Development Center

2008 - 2016

Armada

Developed a jury system for a government electronic project.
Constructed an alternate civil service system for the Ministry of Labor.
Built a system for mobile repair teams specifically helping them with geographically distributed objects.
Developed dozens of services and components for a range of systems, including finance, workflows, and document flows.

Technologies: JavaScript, MSSQLCE, Oracle, PHP, .NET, SharePoint, Symfony, Node.js, REST, Redux, jQuery, API Integration, SQL, HTML, CSS, Python, Python 3, REST APIs, Front-end

Senior Developer

2005 - 2008

Compulink (Quorum)

Developed a finance system for the finance department of the biggest mobile operator in the country.
Constructed a warehouse management system that could be integrated with the customer's current document flow.
Built dozens of components for corporate portals for the leading companies in a range of industries, including, oil, logistics, food, and steel.

Technologies: .NET, PL/SQL, PHP, JavaScript, Java, REST, jQuery, SQL, HTML, CSS, Front-end

Experience

Alternate Civil Service for the Ministry of Labor

I developed the back end and front end of the alternate civil service for the Ministry of Labor. On this project, I worked closely with business analysts, a quality assurance engineer (QA), and a technical writer. The system was implemented country-wide in connection with thousands of companies.

Education

1996 - 2003

Master's Degree in Computer Systems and Networks

Bauman Moscow Technical University - Moscow, Russia

Skills

Libraries/APIs

React, Node.js, AWS Amplify, jQuery, REST APIs, Three.js

Tools

RabbitMQ

Languages

PHP, JavaScript, TypeScript, SQL, Python 3, C++, SCSS, HTML, CSS, Python, Java

Frameworks

Redux, .NET, Symfony, Laravel, Next.js, Swoole

Paradigms

REST, Microservices, PHP Standards Recommendations (PSR)

Storage

MySQL, Database Architecture, PL/SQL, MSSQLCE, Amazon DynamoDB, Redis, PostgreSQL, Amazon S3 (AWS S3), SQL Performance, Microsoft SQL Server

Platforms

Oracle, SharePoint, Amazon Web Services (AWS), Kubernetes, Docker, AWS Lambda, Shopify, Unix, Linux, MacOS, Windows

Other

Technical Leadership, Software Architecture, Amazon API Gateway, APIs, API Integration, High-load, Performance, PHP Performance, Sharding, Indexing, Caching, Front-end, WebSockets, BrainTree, Payment APIs, Card Payments, Business Reporting, Software, Hardware, Networks, DocuSign, 3D

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