Cagdas is available for hire
Hire CagdasCagdas Ucar
Verified Expert in Engineering
Software Developer
Location
San Diego, CA, United States
Toptal Member Since
July 22, 2019
Cagdas has 20 years of experience in software design, development, and maintenance using a broad range of technologies. He has proven communication skills with clients, management, and technical teams in addition to expertise with web applications, big data, data modeling and analysis, systems architecture, and performance engineering.
Portfolio
AbacusNext
Linux, Azure, Git, Salesforce, NetSuite, Jenkins, PHP, C#, MySQL, TypeScript...
Weedguide
Solr, Express.js, Node.js, React, HBase, MySQL, R, MLlib, Spark, Scala, Spring...
OrderPigeon/HubLogix
Amazon Web Services (AWS), Magento, SQL Server Integration Services (SSIS)...
Experience
Availability
Part-time
Preferred Environment
MySQL, React, Node.js, WebStorm, Linux, Windows
The most amazing...
...thing I've built is a system that updates inventory, fulfills orders, and uploads shipments automatically between Amazon/eBay/websites and a network of vendors.
Work Experience
VP of Automation Technologies
2016 - 2019
AbacusNext
- Designed and created a client portal that enables customers to submit support tickets, manage services, update payment methods, pay outstanding invoices, and purchase additional products and services. Integrated Netsuite and Salesforce. Single page application with load-balanced web servers. Results: 100,000+ users, 11,000+ tickets.
- Architected and oversaw the development of a store, quoting system, license management system, and recurring billing system (Angular 2+, Node, Koa, MySQL) with automatic license creation for purchases.
- Architected and oversaw the development of cloud automation utilities such as VM/user creation, password resets, etc. The back end was built with C# .Net Core, and the front end with Angular 2 and Koa. Secured with MFA.
Technologies: Linux, Azure, Git, Salesforce, NetSuite, Jenkins, PHP, C#, MySQL, TypeScript, Express.js, Koa, Node.js, Angular Material, Angular, JavaScript, ES5
Software Engineer
2017 - 2018
Weedguide
- Created distributed web crawler with Java, Scala, and Spark to fetch pages using Chrome.
- Built machine learning models with Java, Scala, Spark, and R to classify web content. Made it available in Java Spring API. Developed training data entry UI in React / Cordova application.
Technologies: Solr, Express.js, Node.js, React, HBase, MySQL, R, MLlib, Spark, Scala, Spring, Java
CTO
2013 - 2016
OrderPigeon/HubLogix
- Designed and created OrderPigeon, a service that updates inventory levels, ships orders, and carries shipments between suppliers and eCommerce sites such as Amazon, eBay, and Magento. Integrated with 50+ vendors and 10 order channels. Used PHP, MySQL, Linux, and AWS.
- Designed and built CatalogSync, a product content management system for extracting, transforming, and loading product data between vendors and eCommerce sites. Created custom Magento API for faster updates. Used PHP, Microsoft SQL Server, Windows, and AWS.
Technologies: Amazon Web Services (AWS), Magento, SQL Server Integration Services (SSIS), Microsoft SQL Server, ASP, MySQL, JavaScript, PHP
Director of Engineering
2008 - 2013
Internet Matrix
- Consolidated company servers and codebase. Designed and created a cluster system with load-balanced web, email, and DNS services, MySQL and Memcached back end, and Lustre parallel file system as SAN. 10,000+ websites in a single framework.
- Designed and created an eCommerce store and billing system that can provision websites and domains.
- Created mailer system in PHP cron jobs for newsletters with parallel sending, velocity and acceleration checks that worked on multiple IPs. Improved delivery rates to 150,000 emails/day.
Technologies: Lustre, Courier, Qmail, Memcached, MySQL, JavaScript, C++, C, PHP
Software Engineer
2008 - 2008
Brickfish
- Built OLAP data warehouse and business analytics dashboard for reporting key performance indicators. Improved performance of the main client reports from 15 minutes to 20 seconds.
- Optimized SQL queries and stored procedures. Improved MS SQL Server CPU usage by 24%.
Technologies: JavaScript, ASP.NET, MDX, OLAP, SQL Server Analysis Services (SSAS), Microsoft SQL Server, C#
Software Engineer
2007 - 2008
HSBC Auto Finance
- Created dealer CRM system in Perl and MySQL. Completed data migration from Salesforce and older systems. Reached active employee user base of 400+. Over 13,000 dealer contacts were collected and segmented. More than 15,000 calls and 70,000 visits were recorded.
- Created data mart and enhanced 20+ business intelligence reports for effective performance management and process optimization. Received two excellence awards.
Technologies: MySQL, IBM Db2, Oracle, R, SAS, C#, Visual Basic for Applications (VBA), JavaScript, Perl
Software Engineer
2006 - 2007
Miva
- Solved long outstanding problem in SQL database engine B-tree indexes in C++. Update and delete performances increased by as much as 100%.
- Integrated VeriSign and PayPal electronic payment solutions with Miva e-commerce package using MivaScript proprietary XML language. Expanded customer base and increased gateway revenue.
- Reverse engineered and customized subscription billing solution for company services. Migrated old billing system. Results: savings over $50,000 per year.
Technologies: Solaris, FreeBSD, Linux, Oracle, PostgreSQL, MySQL, Web Services, JavaScript, PHP, C++, C
Software Engineer
2003 - 2006
Exametric/Verint
- Innovated new features for optimizing linear regression and Fourier forecast algorithm parameters. Secured a $2 million contract by surpassing rivals in forecast contest with over 40% improved accuracy. Developed with VB6, C# (interop), and SQL stored procedures.
- Optimized MS SQL queries and ETL processes. Increased data import speed 5 times by using OLAP/MDX and forecast performance by more than 100% by flattening SQL stored procedures.
Technologies: MDX, DTS, SQL Server Analysis Services (SSAS), SOAP, IIS, Visual Basic, C#
Software Engineer
1998 - 2002
Garanti Technology
- Re-factored VISA/Mastercard electronic payment server code with DB2 migration. Heavy volume transaction times dropped from 7-8 seconds to below 1 second. Reached record transaction volume.
- Developed web application (C++ on AIX Apache and CICS back end) to provide temporary cards to customers who apply for store credit cards. Increased transactions by more than $50,000 per month.
- Fixed all bugs of in-house VB6 recurring billing solution given to member merchants and re-factored code to improve performance. Reached a record volume of more than 100,000 transactions per month.
Technologies: AIX, IBM Db2, Apache, CICS, TSO, JCL, Visual Basic 6 (VB6), C
Experience
cagdasucar.com
https://cagdasucar.comMy portfolio site. This is written in React. Fully functional components using state hooks. Fully responsive design. Can be converted to a React Native application easily. Here is the code for it: https://github.com/cucar/cagdasucar.com
Shopping Cart
https://turing.cagdasucar.com/This is a shopping cart for t-shirts. It is not really used. It's just for showing my development skills. Backend is written with Koa and MySQL. The front end is React with functional components using state hooks. It uses Stripe for payments. Fully responsive design. Here is the code for it: https://github.com/cucar/turing
Integer Factorization
https://github.com/cucar/factorizationThis is my attempt for logarithmic time complexity integer factorization. I basically create a system of binary equations and have the computer solve them. It actually works but it's not as efficient as I would have thought. It is not logarithmic time complexity at all. Probably some power of n.
Skills
Languages
JavaScript, ES5, MDX, Visual Basic for Applications (VBA), SAS, Visual Basic, Visual Basic 6 (VB6), CICS, TypeScript, PHP, C#, C, C++, Java, Scala, Perl, R, Lustre
Frameworks
Angular, Spring, ASP, ASP.NET, Angular Material, MUI (Material UI), Express.js, Koa, Spark
Libraries/APIs
Node.js, MLlib, React, Chai, Spark ML
Other
Front-end Development, Web Services, SOAP, TSO, Multidimensional Expressions (MDX), Machine Learning, IIS, Qmail, Courier, NetSuite, Software Development Management, Software Development
Storage
MySQL, HBase, SQL Server Analysis Services (SSAS), PostgreSQL, Oracle 10g, Microsoft SQL Server, IBM Db2, Memcached, Amazon S3 (AWS S3), SQL Server Integration Services (SSIS), MVS
Tools
Git, DTS, JCL, Mocha, Spark SQL, WebStorm, Visual Studio, Solr, Apache, NGINX, Postfix, Jenkins
Paradigms
OLAP, Automation
Platforms
Oracle, Magento, Salesforce, Azure, Linux, Windows, FreeBSD, Solaris, AIX, Amazon Web Services (AWS)
Education
1993 - 2001
Bachelor of Science Degree in Computer Engineering
Bogazici University - Istanbul, Turkey
Certifications
JANUARY 2019 - PRESENT
Finding Hidden Messages in DNA (Bioinformatics I)
UCSD (Coursera)
MAY 2018 - PRESENT
Neural Networks and Deep Learning
Stanford University (Coursera)
SEPTEMBER 2014 - PRESENT
Machine Learning
Standford University (Coursera)