Ezequiel is available for hire

Ezequiel Golub

Verified Expert in Engineering

AWS Cloud Architecture Developer

Buenos Aires, Argentina

Toptal member since March 23, 2016

Expertise

Back-end Developers API AWS RDS Interim CTOs SQL MySQL Python Agile Development Django Full-stack Software Architecture Cloud Architecture AWS Cloud

Bio

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

Stori

Stensul

PHP, Node.js, Architecture, Cloud Architecture, Google Cloud Platform (GCP)

Coderhouse

CTO, Performance Management, Team Building, Architecture...

Experience

AWS Cloud Architecture - 7 years
JavaScript - 5 years
Node.js - 5 years
Python - 5 years
Distributed Team Management - 5 years
CTO - 3 years
Django - 2 years
React - 2 years

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

Senior Engineering Manager

2023 - 2024

Stori

Managed teams responsible for user-facing credit card experience for over 2 million clients at Stori.
Led the development of innovative features to enhance user experience and drive customer engagement.
Implemented strategies to optimize credit card experience, resulting in increased user satisfaction and retention measured through NPS and LTV.
Released a new premium credit card product in Stori, going from one to two credit card offerings within the company.
Increased team productivity by measuring cycle time and enabling better CI practices.

Technologies: Go

Senior Engineering Manager

2023 - 2023

Stensul

Headed up the Multichannel Squad at Stensul, leading the successful rollout of the company's second product, a website editor, resulting in a significant increase in client sign-ups.
Spearheaded the effort to standardize all interfaces using a new design system based on cutting-edge technologies like Shadcn.
Managed a team of 6–10, delivering high-quality results aligned with company goals.

Technologies: PHP, Node.js, Architecture, Cloud Architecture, Google Cloud Platform (GCP)

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, Technical Architecture

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, Technical Architecture

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, Technical Architecture

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, Web Scraping

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

A 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.

Education

2023 - 2023

Certified Blockchain Developer in Blockchain

Polkadot Blockchain Academy - Worldwide

Certifications

FEBRUARY 2023 - PRESENT

Blockchain Certified Developer

Polkadot

Skills

Libraries/APIs

API Development, Node.js, Social APIs, REST APIs, jQuery, React, Web3.js

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

Languages

Python, SQL, HTML, PHP, JavaScript, CSS, Visual Basic, Visual FoxPro, Perl, Rust, Go

Frameworks

Django, Django REST Framework, Hadoop, Flask, Redux, Laravel, CodeIgniter, AngularJS, Angular, Parity Polkadot, NestJS

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

Platforms

Amazon Web Services (AWS), Heroku, Linux, AWS Lambda, Amazon EC2, MacOS, WordPress, Docker, DigitalOcean, Blockchain, Blockchain Platforms, Kubernetes, Google Cloud Platform (GCP)

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, Technical Architecture, 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, Web Scraping, Ajax, Cloudflare, Amazon Kinesis, Functional Design, Business Models, Financial Modeling, Financing, TCP/IP, Packet Communication, API Gateways, Amazon API Gateway

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