Tamas Erdos, Developer in Raleigh, NC, United States
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Tamas Erdos

Verified Expert  in Engineering

Full-stack Developer

Raleigh, NC, United States
Toptal Member Since
February 10, 2022

Tamas is a self-taught developer and business executive with 10+ years of experience working on tech solutions for various industries. Combining strong technical expertise with a comprehensive vision of the project, he approaches problems practically, emphasizing security, reliability, and a delightful customer experience. As a full-stack developer, Tamas is keen on building the entire solution, including the test suite, and providing additional product management and user experience inputs.


Ruby on Rails (RoR), React, PostgreSQL, Google Cloud Platform (GCP), Ruby...
Gyomai Kner Nyomda
Leadership, Strategy, Sales
Pickle Corp
React, React Native, Ruby on Rails (RoR), Ruby on Rails API, Product Management...




Preferred Environment

Linux, RubyMine, Vim Text Editor

The most amazing...

...experience I’ve built for Narvar was a payment API that had to be ready in one week and is used to process $10,000 in daily transactions.

Work Experience

Senior Software Engineer

2020 - 2021
  • Acted as technical lead for Narvar zero-to-one projects, working with the design, product management, and operations teams to prioritize and deliver new features for three internal systems.
  • Engineered new capabilities and integrated seven carriers into the Shopify Returns product, using Ruby on Rails and React. This was responsible for over $1 million in daily refunds.
  • Created a Ruby on Rails API to enable the payment ledger and performed the Stripe integration with core Narvar services reaching tens of thousands of users daily.
Technologies: Ruby on Rails (RoR), React, PostgreSQL, Google Cloud Platform (GCP), Ruby, Ruby on Rails API, Python, Jira, JavaScript, API Design

Chief Executive Officer

2017 - 2019
Gyomai Kner Nyomda
  • Led Gyomai Kner Nyomda, a subsidiary of ANY Security Printing PLC, founded in 1882 and responsible for printing 2.5 million books per year with a 20% market share.
  • Analyzed sales, finance, and operations. Crafted and executed a turnaround plan increasing the yearly profit by over 80%.
  • Designed and implemented a KPI-based bonus system for 135 employees, which reduced overtime work by 30%.
  • Introduced a new pricing strategy, increasing the peak month sales by 20% and reducing the overbooking by 90%.
  • Hired and trained my successor and continued to serve as a non-executive on Kner and ANY's boards.
Technologies: Leadership, Strategy, Sales

Chief Technology Officer

2016 - 2017
Pickle Corp
  • Launched Snappatizer, an iOS app that enables users to discover the best nearby local dishes ranked higher by the Snappatizer’s proprietary algorithm. Used JavaScript, React Native, and Ruby on Rails.
  • Engineered and documented the JSON RESTful API with 15 methods, using Ruby on Rails and achieving a 98% test coverage.
  • Implemented the iOS app's business logic, including navigation, drag and drop, API consumption, and photo upload. Used JavaScript, React Native, and Redux.
  • Architected the product development process consisting of Agile, Kanban, and CI/CD practices. It led to same-day bug fixes and rapid responses to customer needs.
  • Acted as a product owner and wrote user stories to break down epics into manageable chunks.
Technologies: React, React Native, Ruby on Rails (RoR), Ruby on Rails API, Product Management, Leadership, JavaScript, Heroku, PostgreSQL, Amazon Web Services (AWS), API Design, Redux

Software Engineer

2013 - 2016
  • Led the development of a key patient website, patients.stryker.com, achieving a 99.9% uptime for over 50,000 monthly visitors. Used Ruby on Rails, JavaScript, and React and implemented a test suite with 95% code coverage.
  • Managed a 5-people development team and the processes for creating patients.stryker.com. Delivered the project within the 3-month expected timeframe and under the $5 thousand established budget.
  • Architected the system's back end, including a surgeon locator, seminar manager, admin interface, and submission and approval queue. Used Ruby on Rails and saved the company $1 million.
  • Developed and documented the JSON RESTful API in Ruby on Rails to get surgeon information and enable the creation of personalized marketing brochures.
Technologies: Ruby on Rails (RoR), React, CSS, HTML, JavaScript, jQuery, Product Management


I launched Snappatizer, an iOS application that helps people find food by ranking specific dishes. It helps answer the question: who’s got the best spaghetti carbonara nearby? The app was built in React Native and featured a Ruby on Rails API back end.

USPS Returns

I led the development of a USPS return application for Narvar. The application enables small retailers who are USPS customers to manage returns. During the returns process, customers receive a shipping label. Retailers can manage all facets of the experience using a secure admin portal. The application was built using PostgreSQL, Ruby on Rails, and React for Narvar.

Stryker Surgeon Locator

I led the development of the Stryker Surgeon Locator, a Ruby on Rails web application to help orthopedics patients find surgeons. It is used by thousands of people every day. I also acted as Product Manager for this project, working closely with a designer and a copywriter.

Narvar Payments Internal API

I've handled this project development for Narvar as one of my first contributions to the company. It is a Ruby on Rails API used by several Narvar products to process payments from consumers. It has a full test suite and integrates with Narvar's internal APIs, processing tens of thousands of daily transactions.
2008 - 2010

Master's Degree in Business Administration (MBA)

NYU Stern School of Business - New York, USA

2002 - 2006

Bachelor's Degree in Business Administration

Babson College - Wellesley, Massachusetts, USA


React, Ruby on Rails API, REST APIs, jQuery


RubyMine, Vim Text Editor, RSpec, Jira


Ruby on Rails (RoR), React Native, Tailwind CSS, Bootstrap, Material UI, Redux


Management, DevOps


Ruby, JavaScript, CSS, HTML, SQL, Python, CoffeeScript


Linux, MacOS, Google Cloud Platform (GCP), Heroku, Amazon Web Services (AWS)


PostgreSQL, Database Administration (DBA)


Financial Analysis, Full-stack, Product Management, API Design, Quantitative Finance, Information Systems, OAuth, Leadership, Strategy, Sales, Material Design

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