Mario Oprea, Amazon API Gateway Developer in Brașov, Brașov County, Romania
Mario Oprea

Amazon API Gateway Developer in Brașov, Brașov County, Romania

Member since November 14, 2018
Mario is an AWS certified developer and solutions architect with two years of experience developing Python Serverless APIs deployed on AWS Lambda and AWS API Gateway. For more than a decade, he's contributed to the development of CMS, eCommerce, and e-learning enterprise platforms built for Fortune 500 companies and successful startups.
Mario is now available for hire


  • Weezy Group Ltd
    Ruby on Rails (RoR), PostgreSQL, Heroku, Python, Elasticsearch, Go...
  • GoCardless
    Test-driven Development (TDD), Kubernetes, PostgreSQL, Ruby, Looker, BigQuery...
  • QTeam Software Solutions SRL
    System Advisor Model (SAM), AWS CloudFormation, Redshift, Data Pipelines...



Brașov, Brașov County, Romania



Preferred Environment

AWS Lambda, Tmux, Amazon Web Services (AWS), PlantUML, Vim Text Editor, Git, Docker, IntelliJ IDEA

The most amazing...

...project I've architected and built is an enterprise Serverless e-learning platform with SAML, LTI, and Experience API.


  • Senior Back-end Engineer

    2021 - 2021
    Weezy Group Ltd
    • Developed and synchronized processes between the inventory management system and the eCommerce marketplace.
    • Pioneered an admin interface to simplify and automate merchandising.
    • Engineered alternative product search based on Elasticsearch.
    Technologies: Ruby on Rails (RoR), PostgreSQL, Heroku, Python, Elasticsearch, Go, AWS Lambda, Amazon DynamoDB, AWS Step Functions, Amazon SQS, Okta
  • Senior Back-end Engineer

    2019 - 2021
    • Designed and implemented background processes to initiate, track, and reconcile internal flow of funds, customer payouts, and FX transfers.
    • Implemented a ledger system to track fund movements between millions of bank accounts in response to various types of events.
    • Analyzed, transformed, and built dashboards for terabytes of transactional data using Bigquery, DBT, and Looker.
    Technologies: Test-driven Development (TDD), Kubernetes, PostgreSQL, Ruby, Looker, BigQuery, Google Cloud Platform (GCP), Ruby on Rails (RoR)
  • Developer | Technical Architect

    2016 - 2019
    QTeam Software Solutions SRL
    • Designed and developed serverless multitier architectures on AWS API Gateway, AWS Lambda, CloudFront, S3, SNS, SQS.
    • Developed Python API endpoints continuously deployed on AWS Lambda using Jenkins pipelines and Bitbucket pipelines.
    • Implemented API webhooks where changes triggered in third-party systems are streamed into AWS Kinesis to be reliably processed.
    • Defined ETL processes, scheduled by the AWS data pipeline, to synchronize data from AWS RDS Aurora into AWS RedShift and build analytics.
    • Implemented a faceted search using Elasticsearch populated by AWS Lambda triggered by AWS CloudWatch Events or AWS RDS Aurora triggers.
    • Automated the provisioning and configuration of the infrastructure using AWS CloudFormation, EC2 Parameter Store, and Bitbucket Pipelines.
    Technologies: System Advisor Model (SAM), AWS CloudFormation, Redshift, Data Pipelines, Amazon DynamoDB, Elasticsearch, Amazon ElastiCache, Relational Database Services (RDS), AWS Kinesis, Amazon SQS, AWS Push Notification Service (AWS SNS), API Gateways, AWS Lambda, Python, Flask
  • Magento Developer | Technical Lead

    2014 - 2015
    Rocket Web
    • Implemented the back end for various components required for an eCommerce platform: catalog import, layered navigation, payment methods, shipping methods, checkout customization, order fulfillment, and more.
    • Migrated millions of records of catalog data, orders data, customers, subscriptions from legacy systems to new Magento Enterprise implementations.
    • Built Magento integrations for various third-party systems using different APIs, like SOAP and REST.
    • Developed enhancements for multiple Magento payment subscription extensions dependent on PayPal, Authorize.NET, and CyberSource as payment processors.
    • Defined the strategy and implemented automated test scenarios for subscription systems.
    Technologies: Memcached, Behat, PHPUnit, Git, Apache, PHP, Magento
  • Web Developer | Technical Lead

    2009 - 2014
    • Implemented new features and solved issues for a CMS developed in Django and Python to manage the main category page for a major US retailer.
    • Built and executed performance tests in JMeter and similar tools.
    • Implemented the infrastructure configuration and monitoring improvements.
    • Installed features on a high-traffic Magento EE website. Features included custom shipping and payment methods, refunds, exchange workflow integrated with warehouse APIs, multi-level marketing rewarding logic, and customer segments.
    Technologies: Memcached, Varnish, Apache, MySQL, PHP, Magento, Python, Django
  • Java Developer, Team Lead, Team Manager

    2004 - 2009
    Advanced Mobile Applications
    • Developed J2ME applications and ported them on hundreds of mobile devices.
    • Integrated mobile carriers API to support monthly recurrent charges payment model.
    • Oversaw the development team allocation, project planning, and performance reviews.
    Technologies: Django, Python, Qt, C++, J2ME, Java


  • Magento Debug | Magento Developer Toolbar

    This is a Magento 1.x extension that offers insights about various Magento components during development: routing setup, execution timeline, database queries, configuration, and more.

  • eLearning Platform

    This is a serverless platform deployed to AWS that uses multiple services to provide a scalable, highly available training platform for enterprise businesses from various industries (finance, education, aviation, etc)

  • THK's North America eCommerce Website

    For this project, I had the role of a technical architect and developer in the build of THK's North American eCommerce.

  • Magneto Varnish

    A Magento 1.x extension that was offering a full page cache implementation using Varnish.


  • Languages

    Python, PHP, SQL, C++, Ruby, Go, JavaScript, Java, Bash
  • Frameworks

    Flask, Qt, PHPUnit, Ruby on Rails (RoR), Swagger, Symfony 3, Django, JSON Web Tokens (JWT)
  • Tools

    Bitbucket, AWS CloudFormation, Amazon SQS, AWS Push Notification Service (AWS SNS), Amazon CloudWatch, Docker Compose, Amazon CloudFront CDN, Boto 3, Pytest, IntelliJ IDEA, Vim Text Editor, Apache, Varnish, Behat, Tmux, BigQuery, Looker, Amazon ElastiCache, AWS IAM, AWS Key Management Service (KMS), Subversion (SVN), Git, Amazon Virtual Private Cloud (VPC), AWS Step Functions
  • Paradigms

    Serverless Architecture, Continuous Integration (CI), Continuous Delivery (CD), Unit Testing, System Advisor Model (SAM), Test-driven Development (TDD)
  • Platforms

    AWS Lambda, Magento 1, Contentful, AWS Kinesis, Docker, Magento, Amazon Web Services (AWS), Google Cloud Platform (GCP), Kubernetes, J2ME, New Relic, Kaltura, Heroku
  • Storage

    Amazon S3 (AWS S3), Data Pipelines, MySQL, Memcached, PostgreSQL, Amazon DynamoDB, Amazon Aurora, Redis, Elasticsearch, Redis Cache, Redshift
  • Other

    Amazon API Gateway, AWS CodePipeline, xAPI, Learning Tools Interoperability (LTI), PlantUML, API Gateways, Relational Database Services (RDS), SAML-auth, Performance Testing, LDAP, Continuous Monitoring, Okta
  • Libraries/APIs

    Zappa, Experience API (xAPI), React, MobX, Rollbar, Requests


  • Bachelor’s Degree in Mathematics and Computer Science
    2000 - 2004
    University Petrol-Gaze - Ploiesti, Romania


  • AWS Certified Solutions Architect - Associate
    OCTOBER 2018 - NOVEMBER 2020
    Amazon Web Services, Inc.
  • AWS Certified Developer - Associate
    OCTOBER 2018 - OCTOBER 2020
    Amazon Web Services, Inc.
  • Magento M1 Developer Plus
    Magento U

To view more profiles

Join Toptal
Share it with others