Ezequiel is available for hire
Hire EzequielEzequiel Golub
Verified Expert in Engineering
AWS Cloud Architecture Developer
Location
Buenos Aires, Argentina
Toptal Member Since
March 23, 2016
Ezequiel has over 20 years of software development and tech management experience, both as a contractor and as part of a company. He started his career with the Y2K bugs right out of high school and has worked a variety of roles inside tech as a front and back-end developer, a DevOps engineer, a senior engineering manager for a big eCommerce company, and two times as a hands-on CTO for local startups. Ezequiel loves new challenges and expanding his knowledge and skills.
Portfolio
Coderhouse
CTO, Performance Management, Team Building, Architecture...
Rappi
Performance Management, Team Building, Mentorship & Coaching, Architecture...
Agilis
Amazon CloudFront CDN, Cloudflare, Amazon EC2, Webpack, JavaScript, React...
Experience
Availability
Part-time
Preferred Environment
Git, Vim Text Editor, Sublime Text, MacOS, Linux, Blockchain
The most amazing...
...project I've worked on involved analyzing 250 million daily hits in real time for an advertising network and making the whole dataset available for the client.
Work Experience
CTO
2021 - 2022
Coderhouse
- Managed to restructure and grow the ten-person team into five focused teams numbering over 25 devs. Recruited over 20 devs in 12 months with great retention numbers and team NPS.
- Migrated the whole stack from Heroku over to AWS using EKS for an app with over 90.000 MAUs. Improved the codebase to include unit testing and sonarqube for code checking. Moved several services into a more microservices-oriented architecture.
- Managed the product organization for a Quarter while we looked for a kick-ass CPO. Implemented several organizational redesigns to reprioritize how the product org interfaced with the rest of the company.
- Improved on several KPIs such as student rating from 3,8 to 4,4 (out of 5), loading time, and error rates were reduced to half their initial values.
- Contributed code regularly (mostly Express.js and NestJS), reviewed a lot of PRs from the team, and served as architect in residence.
Technologies: CTO, Performance Management, Team Building, Architecture, Amazon Web Services (AWS), MongoDB, AWS Cloud Architecture, DevOps, APIs, Net Promoter Score (NPS), Scrum, Business Models, Node.js, ETL, API Development, API Design, Back-end, Full-stack, Agile, Packet Communication, Networks, IT Project Management, IT, Cloud Architecture, Back-end Architecture, Kubernetes, Testing, NestJS, Microservices, Amazon Cognito, PostgreSQL, Heroku, Amazon S3 (AWS S3), API Management, Global Team Management, Distributed Team Management, Microservices Architecture, API Gateways, Amazon API Gateway, Software Architecture, Application Architecture, Web Application Architecture, Caching, Full-stack Development, REST APIs, Agile Project Management, IT Management, Team Leadership, Leadership
Senior Engineering Manager
2019 - 2021
Rappi
- Started my tenure managing two teams with over 20 devs and managed to grow my area responsibilities to include a broader scope and 2.5x the team size. Hired over 40 devs with very little attrition. Coached several key people into bigger positions.
- Revamped the outbound payment system for hundreds of thousands of payments and several hundred million per month, increasing reliability and speed.
- Oversaw the implementation of several UX and back-end improvements in the inbound payments side, which meant we had great acceptance and managed to keep fraud in check. Passed two PCI level two audits.
- Served as a hands-on manager. Contributed some code regularly to the team, mostly small items, to have first-hand experience with the DX. Reviewed all critical PRs and every architecture decision made by my teams.
Technologies: Performance Management, Team Building, Mentorship & Coaching, Architecture, AWS Cloud Architecture, Payment APIs, Card Payments, Credit Cards, eCommerce, APIs, SQL, Net Promoter Score (NPS), Scrum, Business Models, ETL, API Development, API Design, Back-end, Agile, IT Project Management, IT, Cloud Architecture, Back-end Architecture, Amazon RDS, Testing, Microservices, PostgreSQL, Amazon S3 (AWS S3), API Management, Global Team Management, Distributed Team Management, Microservices Architecture, Troubleshooting, API Gateways, Enterprise Application Architecture, Software Architecture, Application Architecture, Web Application Architecture, Caching, REST APIs, Agile Project Management, IT Management, Team Leadership, Leadership
CTO
2017 - 2019
Agilis
- Led the transformation of a traditional financial entity into a fintech, starting from a Powerpoint. Managed product definitions and recruited the first tech team. Led a seven-person team, including a TL, front-end and back-end devs, and a UX expert.
- Participated in getting a series A raise with world-class VCs like Kaszek Ventures and QED Investors. This allowed us to build a bigger and better tech team and improved our market outlook.
- Built an innovative product that allows our users to apply for an asset-backed loan and receive an accurate credit offer in seconds, taking into account their collateral and credit profile.
- Ran tech recruiting for a small company and coordinated with non-tech areas.
- Built the foundational code ((Django and React) while we recruited. Actively contributed code, reviewed PRs, and served as a software architect.
Technologies: Amazon CloudFront CDN, Cloudflare, Amazon EC2, Webpack, JavaScript, React, Terraform, Ansible, Django, Python, Architecture, Feasibility, AWS Cloud Architecture, DevOps, Fintech, APIs, CSS, SQL, Net Promoter Score (NPS), Scrum, Financial Modeling, Financing, Node.js, API Development, AWS Lambda, API Design, Back-end, Full-stack, Django REST Framework, Celery, Agile, Pytest, Packet Communication, Networks, IT Project Management, IT, Cloud Architecture, Back-end Architecture, Amazon RDS, PostgreSQL, Amazon S3 (AWS S3), API Management, Global Team Management, Distributed Team Management, Troubleshooting, Amazon API Gateway, Software Architecture, Application Architecture, Web Application Architecture, Caching, Full-stack Development, REST APIs, Agile Project Management, IT Management, Team Leadership, Leadership
Software Developer
2013 - 2018
Freelance
- Created a data pipeline for the analytics of www.adoos.com using Amazon Lambda, Kinesis, and Redshift.
- Programmed a self-service advertising solution for Rekket, an online advertising agency (www.avisosfaciles.com).
- Built three different complex sites using Django and PostgreSQL.
- Created a lead management platform for an insurance company.
- Worked on the internal workflow and billing system for a leading online advertising company using Flask, SQLAlchemy, and MySQL.
Technologies: Amazon Kinesis, Redshift, Elasticsearch, Django, Python, APIs, SQL, API Development, API Design, Web3.js, Back-end, Social APIs, Full-stack, Django REST Framework, Celery, Angular, Networks, IT Project Management, Back-end Architecture, Amazon RDS, Amazon S3 (AWS S3), Troubleshooting, Application Architecture, Web Application Architecture, Caching, Full-stack Development, REST APIs
DevOps Engineer
2016 - 2017
Big Media Co.
- Built an internal tool and chatbot that allows the team to deploy to AWS Lambda and AWS API gateway with a single command.
- Collaborated in all the ops tasks for the company, using Ansible, CloudFormation, and Terraform.
- Built Python scripts and configured Jenkins tasks to automate repetitive ops tasks.
- Made a POC serverless deployment pipeline using Docker.
- Assisted the development team in debugging problems in production.
Technologies: Amazon Web Services (AWS), Jenkins, Terraform, Docker, Ansible, Python, AWS Cloud Architecture, DevOps, HIPAA Compliance, APIs, SQL, Scrum, API Development, AWS Lambda, API Design, Back-end, Pytest, TCP/IP, Networks, IT, Cloud Architecture, Back-end Architecture, Amazon RDS, PostgreSQL, Amazon S3 (AWS S3), Agile Project Management, Distributed Team Management, Microservices Architecture, Troubleshooting, API Gateways, Enterprise Application Architecture, Software Architecture, Application Architecture, Web Application Architecture, Caching, REST APIs, IT Management
Freelance Software Developer
2013 - 2015
Illuminati Labs
- Analyzed all tweets in Spanish for the World Cup.
- Led the creation of a SmartTV app for LG.
- Made a custom real-time tweet analysis platform that ingests around a million tweets per day.
- Oversaw a 20-server infrastructure.
- Helped the other teams with architecture decisions.
Technologies: Flask, Django, Python, AngularJS, Elasticsearch, Node.js, Full-stack, Angular, Back-end Architecture, Heroku, Amazon S3 (AWS S3), Troubleshooting, Software Architecture, Web Application Architecture, Caching, Full-stack Development, REST APIs
Senior Software Developer
2010 - 2013
Smowtion
- Built a data pipeline to handle 250 million hits daily in nearly real-time using Python and Hadoop.
- Created several tools to better analyze the performance of each publisher.
- Developed the internal payment app, which was responsible for sending several thousand payments using Payoneer and PayPal.
- Programmed a tag server using Node.js to serve around 300 hits per second per tag.
- Created a connector for 10 different advertising networks.
Technologies: Redis, MySQL, Hadoop, Python, PHP, Full-stack, Cloud Architecture, Back-end Architecture, Troubleshooting, Web Application Architecture, Caching, Full-stack Development, REST APIs
Software Developer
2009 - 2010
Wixi
- Built a payment system by using PayPal and capturing CC data on the wixi.com page.
- Worked on sharing and upload features using PHP and Memcached.
- Collaborated on festivalscope.com, a big project for a cinema festivals.
- Developed the Facebook integration for social login.
- Implemented the transcoder integration with a third-party company that provided the service for us through a REST API.
Technologies: Subversion (SVN), Object-oriented Programming (OOP), jQuery, MySQL, Ajax, Troubleshooting, Web Application Architecture, Caching, REST APIs
Lead Developer
2008 - 2009
Dnewmedia
- Built several IE6 compatible sites using WordPress.
- Spearheaded an organization-wide effort to improve testing on all of our web properties.
- Participated in the bidding process for several government-related projects.
- Coached new developers and worked with external IT providers.
- Built an insurance estimator for a leading local insurance company using PHP and MySQL.
Technologies: HTML, MySQL, PHP, WordPress, Web Application Architecture, Caching
Lead Developer
2003 - 2008
DDM (Now Balat.com)
- Built a new CRM application using VB6 and MySQL, which resulted in a 20% increase of closed sales per hour the day after it was implemented.
- Upgraded the new CRM application with PHP instead of VB6, which allowed the team to stop using Windows and move everything to Linux.
- Oversaw server and PBX administration for a 300 seat call center.
- Supported legacy applications in Visual FoxPro until we could migrate them to new platform.
- Worked with several fulfilment houses and payment houses in the US, implementing secure data exchange protocols to support sending millions in sales in a safe manner.
Technologies: PHP, MySQL, Visual FoxPro, Visual Basic
Lead Developer
2002 - 2003
WS4
- Optimized Apache (v1.x) configuration to handle thousands of connections per minute.
- Built a data pipeline using Perl to move data points for further analysis.
- Optimized the MySQL (v4.x) server setup to handle the increased traffic from Argentina's second largest newspaper by adding a new slave server.
- Collaborated on the reporting platform, which was responsible for analyzing millions of daily hits, using MySQL and PHP.
- Used shell scripting to do server sanity checks and to build usage reports.
Technologies: MySQL, PHP, HTML, Perl
Junior Developer
2000 - 2001
Caraytech
- Developed a client side publishing platform, which used VB6 to output HTML sites and upload them using FTP to a web server.
- Built a software forum for the help desk portion of Bannerlandia.
- Worked on several reporting screens.
Technologies: MySQL, Visual Basic, Perl, PHP
Experience
Django Project
The site is an ERP-style website designed for a particular project planning technique. It is built using Django and follows standard project conventions; users should set up a new virtual environment, install pip, sync the database, create a superuser account, and execute the Django server.
Playnctb.com
http://www.playnctb.comA baseball league management project built using Django and PostgreSQL over AWS. It included a very sophisticated back end for league management, static content, and email creation. It had interesting traffic patterns that needed to be handled.
Uplaynetwork
A YouTube monetization platform for millennials that includes syncing with YouTube for statistics.
Avisosfaciles
A complete self service advertising platform that works for publishers and advertisers and allows the advertisers to create and run their ads on the publisher's platform.
Communication For Results
SAAS project management for Sergio Jellinek, a leading researcher in the institutional communications area.
Advpanel
A small side project, Advpanel is a DSP SAAS connected to Facebook ads, Google, and AppNexus.
Headway Digital
An internal workflow tool for Headway Digital.
Smowtion
Smowtion, now closed, was a leading publishing network in 2010, chosen as an endeavor company that year.
Wixi
Wixi was a file sharing social network, with thousands of users at its peak, that was one of the first winners of the TC50 contest.
Festival Scope
A cinema festival portal with a secure video on demand platform for previewing films that was built using CakePHP.
Skills
Languages
Python, SQL, HTML, PHP, JavaScript, CSS, Visual Basic, Visual FoxPro, Perl, Rust
Frameworks
Django, Django REST Framework, Hadoop, Flask, Redux, Laravel, CodeIgniter, AngularJS, Angular, Parity Polkadot, NestJS
Libraries/APIs
API Development, Node.js, Social APIs, REST APIs, jQuery, React, Web3.js
Paradigms
Agile, Back-end Architecture, DevOps, Scrum, Testing, Microservices, Agile Project Management, Microservices Architecture, Application Architecture, Web Application Architecture, Functional Programming, Object-oriented Programming (OOP), MapReduce, HIPAA Compliance, ETL, Enterprise Application Architecture
Storage
MySQL, Redis, PostgreSQL, Amazon S3 (AWS S3), Redshift, Elasticsearch, MongoDB
Other
Architecture, Distributed Team Management, Performance Management, CTO, eCommerce, APIs, API Design, Back-end, IT Project Management, Amazon RDS, API Management, Global Team Management, Troubleshooting, Caching, Team Leadership, Leadership, Full-stack, Feasibility, Team Building, Mentorship & Coaching, AWS Cloud Architecture, Payment APIs, Card Payments, Fintech, Credit Cards, Networks, IT, Cloud Architecture, Software Architecture, Full-stack Development, IT Management, Ajax, Cloudflare, Amazon Kinesis, Functional Design, Business Models, Financial Modeling, Financing, TCP/IP, Packet Communication, API Gateways, Amazon API Gateway
Tools
Terraform, Ansible, Net Promoter Score (NPS), Celery, Sublime Text, Vim Text Editor, Git, Subversion (SVN), Jenkins, Webpack, Amazon CloudFront CDN, NGINX, RabbitMQ, Pytest, Amazon Cognito
Platforms
Amazon Web Services (AWS), Heroku, Linux, AWS Lambda, Amazon EC2, MacOS, WordPress, Docker, DigitalOcean, Blockchain, Blockchain Platforms, Kubernetes
Education
2023 - 2023
Certified Blockchain Developer in Blockchain
Polkadot Blockchain Academy - Worldwide
Certifications
FEBRUARY 2023 - PRESENT
Blockchain Certified Developer
Polkadot
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